// // MWPhotoBrowser.m // MWPhotoBrowser // // Created by Michael Waterfall on 14/10/2010. // Copyright 2010 d3i. All rights reserved. // #import #import "MWCommon.h" #import "MWPhotoBrowser.h" #import "MWPhotoBrowserPrivate.h" #import "UIImage+MWPhotoBrowser.h" #import "NCBridgeSwift.h" #define PADDING 10 static void * MWVideoPlayerObservation = &MWVideoPlayerObservation; @implementation MWPhotoBrowser #pragma mark - Init - (id)init { if ((self = [super init])) { [self _initialisation]; } return self; } - (id)initWithDelegate:(id )delegate { if ((self = [self init])) { _delegate = delegate; } return self; } - (id)initWithPhotos:(NSArray *)photosArray { if ((self = [self init])) { _fixedPhotosArray = photosArray; } return self; } - (id)initWithCoder:(NSCoder *)decoder { if ((self = [super initWithCoder:decoder])) { [self _initialisation]; } return self; } - (void)_initialisation { // Defaults NSNumber *isVCBasedStatusBarAppearanceNum = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"UIViewControllerBasedStatusBarAppearance"]; if (isVCBasedStatusBarAppearanceNum) { _isVCBasedStatusBarAppearance = isVCBasedStatusBarAppearanceNum.boolValue; } else { _isVCBasedStatusBarAppearance = YES; // default } self.hidesBottomBarWhenPushed = YES; _hasBelongedToViewController = NO; _photoCount = NSNotFound; _previousLayoutBounds = CGRectZero; _currentPageIndex = 0; _previousPageIndex = NSUIntegerMax; _displayActionButton = YES; _displayShareButton = YES; _displayDeleteButton = YES; _displayNavArrows = NO; _zoomPhotosToFill = YES; _performingLayout = NO; // Reset on view did appear _rotating = NO; _viewIsActive = NO; _enableSwipeToDismiss = YES; _delayToHideElements = 5; _visiblePages = [[NSMutableSet alloc] init]; _recycledPages = [[NSMutableSet alloc] init]; _photos = [[NSMutableArray alloc] init]; _thumbPhotos = [[NSMutableArray alloc] init]; _didSavePreviousStateOfNavBar = NO; self.automaticallyAdjustsScrollViewInsets = NO; // Listen for MWPhoto notifications [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleMWPhotoLoadingDidEndNotification:) name:MWPHOTO_LOADING_DID_END_NOTIFICATION object:nil]; } - (void)dealloc { [self clearCurrentVideo]; _pagingScrollView.delegate = nil; [[NSNotificationCenter defaultCenter] removeObserver:self]; [self releaseAllUnderlyingPhotos:NO]; } - (void)releaseAllUnderlyingPhotos:(BOOL)preserveCurrent { // Create a copy in case this array is modified while we are looping through // Release photos NSArray *copy = [_photos copy]; for (id p in copy) { if (p != [NSNull null]) { if (preserveCurrent && p == [self photoAtIndex:self.currentIndex]) { continue; // skip current } [p unloadUnderlyingImage]; } } // Release thumbs copy = [_thumbPhotos copy]; for (id p in copy) { if (p != [NSNull null]) { [p unloadUnderlyingImage]; } } } - (void)didReceiveMemoryWarning { // Release any cached data, images, etc that aren't in use. [self releaseAllUnderlyingPhotos:YES]; [_recycledPages removeAllObjects]; // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; } #pragma mark - View Loading // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { // View self.view.backgroundColor = [UIColor whiteColor]; self.view.clipsToBounds = YES; // Setup paging scrolling view CGRect pagingScrollViewFrame = [self frameForPagingScrollView]; _pagingScrollView = [[UIScrollView alloc] initWithFrame:pagingScrollViewFrame]; _pagingScrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; _pagingScrollView.pagingEnabled = YES; _pagingScrollView.delegate = self; _pagingScrollView.showsHorizontalScrollIndicator = NO; _pagingScrollView.showsVerticalScrollIndicator = NO; _pagingScrollView.backgroundColor = [UIColor whiteColor]; _pagingScrollView.contentSize = [self contentSizeForPagingScrollView]; [self.view addSubview:_pagingScrollView]; // Toolbar _toolbar = [[UIToolbar alloc] initWithFrame:[self frameForToolbarAtOrientation:[[UIApplication sharedApplication] statusBarOrientation]]]; _toolbar.tintColor = [NCBrandColor sharedInstance].brandElement; _toolbar.barTintColor = [NCBrandColor sharedInstance].tabBar; [_toolbar setBackgroundImage:nil forToolbarPosition:UIToolbarPositionAny barMetrics:UIBarMetricsDefault]; [_toolbar setBackgroundImage:nil forToolbarPosition:UIToolbarPositionAny barMetrics:UIBarMetricsCompact]; _toolbar.barStyle = UIBarStyleDefault; //TWS _toolbar.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth; [_toolbar setTranslucent:NO]; // Toolbar Items if (self.displayNavArrows) { NSString *arrowPathFormat = @"UIBarButtonItemArrow%@"; UIImage *previousButtonImage = [UIImage imageForResourcePath:[NSString stringWithFormat:arrowPathFormat, @"Left"] ofType:@"png" inBundle:[NSBundle bundleForClass:[self class]]]; UIImage *nextButtonImage = [UIImage imageForResourcePath:[NSString stringWithFormat:arrowPathFormat, @"Right"] ofType:@"png" inBundle:[NSBundle bundleForClass:[self class]]]; _previousButton = [[UIBarButtonItem alloc] initWithImage:previousButtonImage style:UIBarButtonItemStylePlain target:self action:@selector(gotoPreviousPage)]; _nextButton = [[UIBarButtonItem alloc] initWithImage:nextButtonImage style:UIBarButtonItemStylePlain target:self action:@selector(gotoNextPage)]; } //TWS if (self.displayDeleteButton) { _deleteButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"delete"] style:UIBarButtonItemStylePlain target:self action:@selector(deleteButtonPressed:)]; } if (self.displayActionButton) { _actionButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"openFile"] style:UIBarButtonItemStylePlain target:self action:@selector(actionButtonPressed:)]; } if (self.displayShareButton) { _shareButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"share"] style:UIBarButtonItemStylePlain target:self action:@selector(shareButtonPressed:)]; } // Update [self reloadData]; // Swipe to dismiss if (_enableSwipeToDismiss) { UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(doneButtonPressed:)]; swipeGesture.direction = UISwipeGestureRecognizerDirectionDown | UISwipeGestureRecognizerDirectionUp; [self.view addGestureRecognizer:swipeGesture]; } // Super [super viewDidLoad]; } - (void)performLayout { // Setup _performingLayout = YES; NSUInteger numberOfPhotos = [self numberOfPhotos]; // Setup pages [_visiblePages removeAllObjects]; [_recycledPages removeAllObjects]; // Navigation buttons if ([self.navigationController.viewControllers objectAtIndex:0] == self) { // We're first on stack so show done button _doneButton = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"Done", nil) style:UIBarButtonItemStylePlain target:self action:@selector(doneButtonPressed:)]; // Set appearance [_doneButton setBackgroundImage:nil forState:UIControlStateNormal barMetrics:UIBarMetricsDefault]; [_doneButton setBackgroundImage:nil forState:UIControlStateNormal barMetrics:UIBarMetricsCompact]; [_doneButton setBackgroundImage:nil forState:UIControlStateHighlighted barMetrics:UIBarMetricsDefault]; [_doneButton setBackgroundImage:nil forState:UIControlStateHighlighted barMetrics:UIBarMetricsCompact]; [_doneButton setTitleTextAttributes:[NSDictionary dictionary] forState:UIControlStateNormal]; [_doneButton setTitleTextAttributes:[NSDictionary dictionary] forState:UIControlStateHighlighted]; self.navigationItem.rightBarButtonItem = _doneButton; } // color self.navigationController.navigationBar.barTintColor = [NCBrandColor sharedInstance].brand; self.navigationController.navigationBar.tintColor = [NCBrandColor sharedInstance].brandText; [self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [NCBrandColor sharedInstance].brandText}]; self.navigationController.navigationBar.translucent = false; [self setExtendedLayoutIncludesOpaqueBars:YES]; // Toolbar items BOOL hasItems = NO; UIBarButtonItem *fixedSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:self action:nil]; fixedSpace.width = 32; // To balance action button UIBarButtonItem *fixedSpaceMini = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:self action:nil]; fixedSpaceMini.width = 25; // To balance action button UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil]; NSMutableArray *items = [[NSMutableArray alloc] init]; // Middle - Nav if (_previousButton && _nextButton && numberOfPhotos > 1) { hasItems = YES; [items addObject:_previousButton]; [items addObject:fixedSpace]; [items addObject:fixedSpace]; [items addObject:_nextButton]; [items addObject:flexSpace]; } else { [items addObject:flexSpace]; } if (_deleteButton) { [items addObject:_deleteButton]; [items addObject:fixedSpaceMini]; } if (_shareButton) { [items addObject:_shareButton]; [items addObject:fixedSpaceMini]; } if (_actionButton) { [items addObject:_actionButton]; } // Toolbar visibility [_toolbar setItems:items]; BOOL hideToolbar = YES; for (UIBarButtonItem* item in _toolbar.items) { if (item != fixedSpace && item != flexSpace) { hideToolbar = NO; break; } } if (hideToolbar) { [_toolbar removeFromSuperview]; } else { [self.view addSubview:_toolbar]; } // Update nav [self updateNavigation]; // Content offset _pagingScrollView.contentOffset = [self contentOffsetForPageAtIndex:_currentPageIndex]; [self tilePages]; _performingLayout = NO; } // Release any retained subviews of the main view. - (void)viewDidUnload { _currentPageIndex = 0; _pagingScrollView = nil; _visiblePages = nil; _recycledPages = nil; _toolbar = nil; _previousButton = nil; _nextButton = nil; _progressHUD = nil; [super viewDidUnload]; } - (BOOL)presentingViewControllerPrefersStatusBarHidden { UIViewController *presenting = self.presentingViewController; if (presenting) { if ([presenting isKindOfClass:[UINavigationController class]]) { presenting = [(UINavigationController *)presenting topViewController]; } } else { // We're in a navigation controller so get previous one! if (self.navigationController && self.navigationController.viewControllers.count > 1) { presenting = [self.navigationController.viewControllers objectAtIndex:self.navigationController.viewControllers.count-2]; } } if (presenting) { return [presenting prefersStatusBarHidden]; } else { return NO; } } #pragma mark - Appearance - (void)viewWillAppear:(BOOL)animated { // Super [super viewWillAppear:animated]; // Nav Bar Appearance iPAD if (self.traitCollection.horizontalSizeClass != UIUserInterfaceSizeClassCompact) { // ----- TWS ----- // self.navigationItem.hidesBackButton = YES; self.navigationController.topViewController.navigationItem.leftBarButtonItem = self.splitViewController.displayModeButtonItem; } // Update UI [self hideControlsAfterDelay]; // If rotation occured while we're presenting a modal // and the index changed, make sure we show the right one now if (_currentPageIndex != _pageIndexBeforeRotation) { [self jumpToPageAtIndex:_pageIndexBeforeRotation animated:NO]; } // Layaout [self.view setNeedsLayout]; } - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; _viewIsActive = YES; // Autoplay if first is video if (!_viewHasAppearedInitially) { if (_autoPlayOnAppear) { MWPhoto *photo = [self photoAtIndex:_currentPageIndex]; if ([photo respondsToSelector:@selector(isVideo)] && photo.isVideo) { [self playVideoAtIndex:_currentPageIndex]; } } } _viewHasAppearedInitially = YES; } - (void)viewWillDisappear:(BOOL)animated { // Detect if rotation occurs while we're presenting a modal _pageIndexBeforeRotation = _currentPageIndex; // Check that we're being popped for good if ([self.navigationController.viewControllers objectAtIndex:0] != self && ![self.navigationController.viewControllers containsObject:self]) { // State _viewIsActive = NO; [self clearCurrentVideo]; // Clear current playing video } // Controls [self.navigationController.navigationBar.layer removeAllAnimations]; // Stop all animations on nav bar [NSObject cancelPreviousPerformRequestsWithTarget:self]; // Cancel any pending toggles from taps [self setControlsHidden:NO animated:NO permanent:YES]; // Super [super viewWillDisappear:animated]; } - (void)willMoveToParentViewController:(UIViewController *)parent { if (parent && _hasBelongedToViewController) { [NSException raise:@"MWPhotoBrowser Instance Reuse" format:@"MWPhotoBrowser instances cannot be reused."]; } } - (void)didMoveToParentViewController:(UIViewController *)parent { if (!parent) _hasBelongedToViewController = YES; } #pragma mark - Layout - (void)viewWillLayoutSubviews { [super viewWillLayoutSubviews]; [self layoutVisiblePages]; } - (void)layoutVisiblePages { // Flag _performingLayout = YES; // Toolbar _toolbar.frame = [self frameForToolbarAtOrientation:[[UIApplication sharedApplication] statusBarOrientation]]; // Remember index NSUInteger indexPriorToLayout = _currentPageIndex; // Get paging scroll view frame to determine if anything needs changing CGRect pagingScrollViewFrame = [self frameForPagingScrollView]; // Frame needs changing if (!_skipNextPagingScrollViewPositioning) { _pagingScrollView.frame = pagingScrollViewFrame; } _skipNextPagingScrollViewPositioning = NO; // Recalculate contentSize based on current orientation _pagingScrollView.contentSize = [self contentSizeForPagingScrollView]; // Adjust frames and configuration of each visible page for (MWZoomingScrollView *page in _visiblePages) { NSUInteger index = page.index; page.frame = [self frameForPageAtIndex:index]; if (page.captionView) { page.captionView.frame = [self frameForCaptionView:page.captionView atIndex:index]; } if (page.selectedButton) { page.selectedButton.frame = [self frameForSelectedButton:page.selectedButton atIndex:index]; } if (page.playButton) { page.playButton.frame = [self frameForPlayButton:page.playButton atIndex:index]; } // Adjust scales if bounds has changed since last time if (!CGRectEqualToRect(_previousLayoutBounds, self.view.bounds)) { // Update zooms for new bounds [page setMaxMinZoomScalesForCurrentBounds]; _previousLayoutBounds = self.view.bounds; } } // Adjust video loading indicator if it's visible [self positionVideoLoadingIndicator]; // Adjust contentOffset to preserve page location based on values collected prior to location _pagingScrollView.contentOffset = [self contentOffsetForPageAtIndex:indexPriorToLayout]; [self didStartViewingPageAtIndex:_currentPageIndex]; // initial // Reset _currentPageIndex = indexPriorToLayout; _performingLayout = NO; } #pragma mark - Rotation - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation { return YES; } #if __IPHONE_OS_VERSION_MAX_ALLOWED < 90000 - (NSUInteger)supportedInterfaceOrientations #else - (UIInterfaceOrientationMask)supportedInterfaceOrientations #endif { return UIInterfaceOrientationMaskPortrait; } - (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { // Remember page index before rotation _pageIndexBeforeRotation = _currentPageIndex; _rotating = YES; // In iOS 7 the nav bar gets shown after rotation, but might as well do this for everything! if ([self areControlsHidden]) { // Force hidden self.navigationController.navigationBarHidden = YES; } } - (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { // Perform layout _currentPageIndex = _pageIndexBeforeRotation; // Delay control holding [self hideControlsAfterDelay]; // Layout [self layoutVisiblePages]; } - (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation { _rotating = NO; // Ensure nav bar isn't re-displayed if ([self areControlsHidden]) { self.navigationController.navigationBarHidden = NO; self.navigationController.navigationBar.alpha = 0; } } #pragma mark - Data - (NSUInteger)currentIndex { return _currentPageIndex; } - (void)reloadData { // Reset _photoCount = NSNotFound; // Get data NSUInteger numberOfPhotos = [self numberOfPhotos]; [self releaseAllUnderlyingPhotos:YES]; [_photos removeAllObjects]; [_thumbPhotos removeAllObjects]; for (int i = 0; i < numberOfPhotos; i++) { [_photos addObject:[NSNull null]]; [_thumbPhotos addObject:[NSNull null]]; } // Update current page index if (numberOfPhotos > 0) { _currentPageIndex = MAX(0, MIN(_currentPageIndex, numberOfPhotos - 1)); } else { _currentPageIndex = 0; } // Update layout if ([self isViewLoaded]) { while (_pagingScrollView.subviews.count) { [[_pagingScrollView.subviews lastObject] removeFromSuperview]; } [self performLayout]; [self.view setNeedsLayout]; } } - (NSUInteger)numberOfPhotos { if (_photoCount == NSNotFound) { if ([_delegate respondsToSelector:@selector(numberOfPhotosInPhotoBrowser:)]) { _photoCount = [_delegate numberOfPhotosInPhotoBrowser:self]; } else if (_fixedPhotosArray) { _photoCount = _fixedPhotosArray.count; } } if (_photoCount == NSNotFound) _photoCount = 0; return _photoCount; } - (id)photoAtIndex:(NSUInteger)index { id photo = nil; if (index < _photos.count) { if ([_photos objectAtIndex:index] == [NSNull null]) { if ([_delegate respondsToSelector:@selector(photoBrowser:photoAtIndex:)]) { photo = [_delegate photoBrowser:self photoAtIndex:index]; } else if (_fixedPhotosArray && index < _fixedPhotosArray.count) { photo = [_fixedPhotosArray objectAtIndex:index]; } if (photo) [_photos replaceObjectAtIndex:index withObject:photo]; } else { photo = [_photos objectAtIndex:index]; } } return photo; } - (MWCaptionView *)captionViewForPhotoAtIndex:(NSUInteger)index { MWCaptionView *captionView = nil; if ([_delegate respondsToSelector:@selector(photoBrowser:captionViewForPhotoAtIndex:)]) { captionView = [_delegate photoBrowser:self captionViewForPhotoAtIndex:index]; } else { id photo = [self photoAtIndex:index]; if ([photo respondsToSelector:@selector(caption)]) { if ([photo caption]) captionView = [[MWCaptionView alloc] initWithPhoto:photo]; } } captionView.alpha = [self areControlsHidden] ? 0 : 1; // Initial alpha return captionView; } - (BOOL)photoIsSelectedAtIndex:(NSUInteger)index { BOOL value = NO; if (_displaySelectionButtons) { if ([self.delegate respondsToSelector:@selector(photoBrowser:isPhotoSelectedAtIndex:)]) { value = [self.delegate photoBrowser:self isPhotoSelectedAtIndex:index]; } } return value; } - (void)setPhotoSelected:(BOOL)selected atIndex:(NSUInteger)index { if (_displaySelectionButtons) { if ([self.delegate respondsToSelector:@selector(photoBrowser:photoAtIndex:selectedChanged:)]) { [self.delegate photoBrowser:self photoAtIndex:index selectedChanged:selected]; } } } - (UIImage *)imageForPhoto:(id)photo { if (photo) { // Get image or obtain in background if ([photo underlyingImage]) { return [photo underlyingImage]; } else { [photo loadUnderlyingImageAndNotify]; } } return nil; } - (void)loadAdjacentPhotosIfNecessary:(id)photo { MWZoomingScrollView *page = [self pageDisplayingPhoto:photo]; if (page) { // If page is current page then initiate loading of previous and next pages NSUInteger pageIndex = page.index; if (_currentPageIndex == pageIndex) { if (pageIndex > 0) { // Preload index - 1 id photo = [self photoAtIndex:pageIndex-1]; if (![photo underlyingImage]) { [photo loadUnderlyingImageAndNotify]; MWLog(@"Pre-loading image at index %lu", (unsigned long)pageIndex-1); } } if (pageIndex < [self numberOfPhotos] - 1) { // Preload index + 1 id photo = [self photoAtIndex:pageIndex+1]; if (![photo underlyingImage]) { [photo loadUnderlyingImageAndNotify]; MWLog(@"Pre-loading image at index %lu", (unsigned long)pageIndex+1); } } } } } #pragma mark - MWPhoto Loading Notification - (void)handleMWPhotoLoadingDidEndNotification:(NSNotification *)notification { id photo = [notification object]; MWZoomingScrollView *page = [self pageDisplayingPhoto:photo]; if (page) { if ([photo underlyingImage]) { // Successful load [page displayImage]; [self loadAdjacentPhotosIfNecessary:photo]; } else { // Failed to load [page displayImageFailure]; } // Update nav [self updateNavigation]; } } #pragma mark - Paging - (void)tilePages { // Calculate which pages should be visible // Ignore padding as paging bounces encroach on that // and lead to false page loads CGRect visibleBounds = _pagingScrollView.bounds; NSInteger iFirstIndex = (NSInteger)floorf((CGRectGetMinX(visibleBounds)+PADDING*2) / CGRectGetWidth(visibleBounds)); NSInteger iLastIndex = (NSInteger)floorf((CGRectGetMaxX(visibleBounds)-PADDING*2-1) / CGRectGetWidth(visibleBounds)); if (iFirstIndex < 0) iFirstIndex = 0; if (iFirstIndex > [self numberOfPhotos] - 1) iFirstIndex = [self numberOfPhotos] - 1; if (iLastIndex < 0) iLastIndex = 0; if (iLastIndex > [self numberOfPhotos] - 1) iLastIndex = [self numberOfPhotos] - 1; // Recycle no longer needed pages NSInteger pageIndex; for (MWZoomingScrollView *page in _visiblePages) { pageIndex = page.index; if (pageIndex < (NSUInteger)iFirstIndex || pageIndex > (NSUInteger)iLastIndex) { [_recycledPages addObject:page]; [page.captionView removeFromSuperview]; [page.selectedButton removeFromSuperview]; [page.playButton removeFromSuperview]; [page prepareForReuse]; [page removeFromSuperview]; MWLog(@"Removed page at index %lu", (unsigned long)pageIndex); } } [_visiblePages minusSet:_recycledPages]; while (_recycledPages.count > 2) // Only keep 2 recycled pages [_recycledPages removeObject:[_recycledPages anyObject]]; // Add missing pages for (NSUInteger index = (NSUInteger)iFirstIndex; index <= (NSUInteger)iLastIndex; index++) { if (![self isDisplayingPageForIndex:index]) { // Add new page MWZoomingScrollView *page = [self dequeueRecycledPage]; if (!page) { page = [[MWZoomingScrollView alloc] initWithPhotoBrowser:self]; } [_visiblePages addObject:page]; [self configurePage:page forIndex:index]; [_pagingScrollView addSubview:page]; MWLog(@"Added page at index %lu", (unsigned long)index); // Add caption MWCaptionView *captionView = [self captionViewForPhotoAtIndex:index]; if (captionView) { captionView.frame = [self frameForCaptionView:captionView atIndex:index]; [_pagingScrollView addSubview:captionView]; page.captionView = captionView; } // Add play button if needed if (page.displayingVideo) { UIButton *playButton = [UIButton buttonWithType:UIButtonTypeCustom]; [playButton setImage:[UIImage imageForResourcePath:@"PlayButtonOverlayLarge" ofType:@"png" inBundle:[NSBundle bundleForClass:[self class]]] forState:UIControlStateNormal]; [playButton setImage:[UIImage imageForResourcePath:@"PlayButtonOverlayLargeTap" ofType:@"png" inBundle:[NSBundle bundleForClass:[self class]]] forState:UIControlStateHighlighted]; [playButton addTarget:self action:@selector(playButtonTapped:) forControlEvents:UIControlEventTouchUpInside]; [playButton sizeToFit]; playButton.frame = [self frameForPlayButton:playButton atIndex:index]; [_pagingScrollView addSubview:playButton]; page.playButton = playButton; } // Add selected button if (self.displaySelectionButtons) { UIButton *selectedButton = [UIButton buttonWithType:UIButtonTypeCustom]; [selectedButton setImage:[UIImage imageForResourcePath:@"ImageSelectedOff" ofType:@"png" inBundle:[NSBundle bundleForClass:[self class]]] forState:UIControlStateNormal]; UIImage *selectedOnImage; if (self.customImageSelectedIconName) { selectedOnImage = [UIImage imageNamed:self.customImageSelectedIconName]; } else { selectedOnImage = [UIImage imageForResourcePath:@"ImageSelectedOn" ofType:@"png" inBundle:[NSBundle bundleForClass:[self class]]]; } [selectedButton setImage:selectedOnImage forState:UIControlStateSelected]; [selectedButton sizeToFit]; selectedButton.adjustsImageWhenHighlighted = NO; [selectedButton addTarget:self action:@selector(selectedButtonTapped:) forControlEvents:UIControlEventTouchUpInside]; selectedButton.frame = [self frameForSelectedButton:selectedButton atIndex:index]; [_pagingScrollView addSubview:selectedButton]; page.selectedButton = selectedButton; selectedButton.selected = [self photoIsSelectedAtIndex:index]; } } } } - (void)updateVisiblePageStates { NSSet *copy = [_visiblePages copy]; for (MWZoomingScrollView *page in copy) { // Update selection page.selectedButton.selected = [self photoIsSelectedAtIndex:page.index]; } } - (BOOL)isDisplayingPageForIndex:(NSUInteger)index { for (MWZoomingScrollView *page in _visiblePages) if (page.index == index) return YES; return NO; } - (MWZoomingScrollView *)pageDisplayedAtIndex:(NSUInteger)index { MWZoomingScrollView *thePage = nil; for (MWZoomingScrollView *page in _visiblePages) { if (page.index == index) { thePage = page; break; } } return thePage; } - (MWZoomingScrollView *)pageDisplayingPhoto:(id)photo { MWZoomingScrollView *thePage = nil; for (MWZoomingScrollView *page in _visiblePages) { if (page.photo == photo) { thePage = page; break; } } return thePage; } - (void)configurePage:(MWZoomingScrollView *)page forIndex:(NSUInteger)index { page.frame = [self frameForPageAtIndex:index]; page.index = index; page.photo = [self photoAtIndex:index]; } - (MWZoomingScrollView *)dequeueRecycledPage { MWZoomingScrollView *page = [_recycledPages anyObject]; if (page) { [_recycledPages removeObject:page]; } return page; } // Handle page changes - (void)didStartViewingPageAtIndex:(NSUInteger)index { // Handle 0 photos if (![self numberOfPhotos]) { // Show controls [self setControlsHidden:NO animated:YES permanent:YES]; return; } // Handle video on page change if (!_rotating || index != _currentVideoIndex) { [self clearCurrentVideo]; } // Release images further away than +/-1 NSUInteger i; if (index > 0) { // Release anything < index - 1 for (i = 0; i < index-1; i++) { id photo = [_photos objectAtIndex:i]; if (photo != [NSNull null]) { [photo unloadUnderlyingImage]; [_photos replaceObjectAtIndex:i withObject:[NSNull null]]; MWLog(@"Released underlying image at index %lu", (unsigned long)i); } } } if (index < [self numberOfPhotos] - 1) { // Release anything > index + 1 for (i = index + 2; i < _photos.count; i++) { id photo = [_photos objectAtIndex:i]; if (photo != [NSNull null]) { [photo unloadUnderlyingImage]; [_photos replaceObjectAtIndex:i withObject:[NSNull null]]; MWLog(@"Released underlying image at index %lu", (unsigned long)i); } } } // Load adjacent images if needed and the photo is already // loaded. Also called after photo has been loaded in background id currentPhoto = [self photoAtIndex:index]; if ([currentPhoto underlyingImage]) { // photo loaded so load ajacent now [self loadAdjacentPhotosIfNecessary:currentPhoto]; } // Notify delegate if (index != _previousPageIndex) { if ([_delegate respondsToSelector:@selector(photoBrowser:didDisplayPhotoAtIndex:)]) [_delegate photoBrowser:self didDisplayPhotoAtIndex:index]; _previousPageIndex = index; } else { if ([_delegate respondsToSelector:@selector(photoBrowser:didDisplayPhotoAtIndex:)]) [_delegate photoBrowser:self didDisplayPhotoAtIndex:index]; } // Update nav [self updateNavigation]; } #pragma mark - Frame Calculations - (CGRect)frameForPagingScrollView { CGRect frame = self.view.bounds;// [[UIScreen mainScreen] bounds]; frame.origin.x -= PADDING; frame.size.width += (2 * PADDING); return CGRectIntegral(frame); } - (CGRect)frameForPageAtIndex:(NSUInteger)index { // We have to use our paging scroll view's bounds, not frame, to calculate the page placement. When the device is in // landscape orientation, the frame will still be in portrait because the pagingScrollView is the root view controller's // view, so its frame is in window coordinate space, which is never rotated. Its bounds, however, will be in landscape // because it has a rotation transform applied. CGRect bounds = _pagingScrollView.bounds; CGRect pageFrame = bounds; pageFrame.size.width -= (2 * PADDING); pageFrame.origin.x = (bounds.size.width * index) + PADDING; return CGRectIntegral(pageFrame); } - (CGSize)contentSizeForPagingScrollView { // We have to use the paging scroll view's bounds to calculate the contentSize, for the same reason outlined above. CGRect bounds = _pagingScrollView.bounds; return CGSizeMake(bounds.size.width * [self numberOfPhotos], bounds.size.height); } - (CGPoint)contentOffsetForPageAtIndex:(NSUInteger)index { CGFloat pageWidth = _pagingScrollView.bounds.size.width; CGFloat newOffset = index * pageWidth; return CGPointMake(newOffset, 0); } - (CGRect)frameForToolbarAtOrientation:(UIInterfaceOrientation)orientation { CGFloat safeAreaBottom = 0; CGFloat height = 49; // iOS 11 safeArea if (@available(iOS 11, *)) { safeAreaBottom = [UIApplication sharedApplication].delegate.window.safeAreaInsets.bottom; } if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone && UIInterfaceOrientationIsLandscape(orientation)) height = 39; return CGRectIntegral(CGRectMake(0, self.view.bounds.size.height - height - safeAreaBottom, self.view.bounds.size.width, height )); } - (CGRect)frameForCaptionView:(MWCaptionView *)captionView atIndex:(NSUInteger)index { // iOS 11 safeArea CGFloat safeAreaBottom = 0; if (@available(iOS 11, *)) { safeAreaBottom = [UIApplication sharedApplication].delegate.window.safeAreaInsets.bottom; } CGRect pageFrame = [self frameForPageAtIndex:index]; CGSize captionSize = [captionView sizeThatFits:CGSizeMake(pageFrame.size.width, 0)]; CGRect captionFrame = CGRectMake(pageFrame.origin.x, pageFrame.size.height - captionSize.height - (_toolbar.superview?_toolbar.frame.size.height:0) - safeAreaBottom, pageFrame.size.width, captionSize.height); return CGRectIntegral(captionFrame); } - (CGRect)frameForSelectedButton:(UIButton *)selectedButton atIndex:(NSUInteger)index { CGRect pageFrame = [self frameForPageAtIndex:index]; CGFloat padding = 20; CGFloat yOffset = 0; if (![self areControlsHidden]) { UINavigationBar *navBar = self.navigationController.navigationBar; yOffset = navBar.frame.origin.y + navBar.frame.size.height; } CGRect selectedButtonFrame = CGRectMake(pageFrame.origin.x + pageFrame.size.width - selectedButton.frame.size.width - padding, padding + yOffset, selectedButton.frame.size.width, selectedButton.frame.size.height); return CGRectIntegral(selectedButtonFrame); } - (CGRect)frameForPlayButton:(UIButton *)playButton atIndex:(NSUInteger)index { CGRect pageFrame = [self frameForPageAtIndex:index]; return CGRectMake(floorf(CGRectGetMidX(pageFrame) - playButton.frame.size.width / 2), floorf(CGRectGetMidY(pageFrame) - playButton.frame.size.height / 2), playButton.frame.size.width, playButton.frame.size.height); } #pragma mark - UIScrollView Delegate - (void)scrollViewDidScroll:(UIScrollView *)scrollView { // Checks if (!_viewIsActive || _performingLayout || _rotating) return; // Tile pages [self tilePages]; // Calculate current page CGRect visibleBounds = _pagingScrollView.bounds; NSInteger index = (NSInteger)(floorf(CGRectGetMidX(visibleBounds) / CGRectGetWidth(visibleBounds))); if (index < 0) index = 0; if (index > [self numberOfPhotos] - 1) index = [self numberOfPhotos] - 1; NSUInteger previousCurrentPage = _currentPageIndex; _currentPageIndex = index; if (_currentPageIndex != previousCurrentPage) { [self didStartViewingPageAtIndex:index]; } } - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView { // Hide controls when dragging begins [self setControlsHidden:YES animated:YES permanent:NO]; } - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView { // Update nav when page changes [self updateNavigation]; } #pragma mark - Navigation - (void)updateNavigation { // Title NSUInteger numberOfPhotos = [self numberOfPhotos]; if (numberOfPhotos > 1) { if ([_delegate respondsToSelector:@selector(photoBrowser:titleForPhotoAtIndex:)]) { self.title = [_delegate photoBrowser:self titleForPhotoAtIndex:_currentPageIndex]; } else { self.title = [NSString stringWithFormat:@"%lu %@ %lu", (unsigned long)(_currentPageIndex+1), NSLocalizedString(@"of", @"Used in the context: 'Showing 1 of 3 items'"), (unsigned long)numberOfPhotos]; } } else { self.title = nil; } // Buttons _previousButton.enabled = (_currentPageIndex > 0); _nextButton.enabled = (_currentPageIndex < numberOfPhotos - 1); //TWS Disable action button if there is no image or it's a video /* MWPhoto *photo = [self photoAtIndex:_currentPageIndex]; if ([photo underlyingImage] == nil || ([photo respondsToSelector:@selector(isVideo)] && photo.isVideo)) { _actionButton.enabled = NO; _actionButton.tintColor = [UIColor clearColor]; // Tint to hide button } else { _actionButton.enabled = YES; _actionButton.tintColor = nil; } */ } - (void)jumpToPageAtIndex:(NSUInteger)index animated:(BOOL)animated { // Change page if (index < [self numberOfPhotos]) { CGRect pageFrame = [self frameForPageAtIndex:index]; [_pagingScrollView setContentOffset:CGPointMake(pageFrame.origin.x - PADDING, 0) animated:animated]; [self updateNavigation]; } // Update timer to give more time [self hideControlsAfterDelay]; } - (void)gotoPreviousPage { [self showPreviousPhotoAnimated:NO]; } - (void)gotoNextPage { [self showNextPhotoAnimated:NO]; } - (void)showPreviousPhotoAnimated:(BOOL)animated { [self jumpToPageAtIndex:_currentPageIndex-1 animated:animated]; } - (void)showNextPhotoAnimated:(BOOL)animated { [self jumpToPageAtIndex:_currentPageIndex+1 animated:animated]; } #pragma mark - Interactions - (void)selectedButtonTapped:(id)sender { UIButton *selectedButton = (UIButton *)sender; selectedButton.selected = !selectedButton.selected; NSUInteger index = NSUIntegerMax; for (MWZoomingScrollView *page in _visiblePages) { if (page.selectedButton == selectedButton) { index = page.index; break; } } if (index != NSUIntegerMax) { [self setPhotoSelected:selectedButton.selected atIndex:index]; } } - (void)playButtonTapped:(id)sender { // Ignore if we're already playing a video if (_currentVideoIndex != NSUIntegerMax) { return; } NSUInteger index = [self indexForPlayButton:sender]; if (index != NSUIntegerMax) { if (!_currentVideoPlayerViewController) { [self playVideoAtIndex:index]; } } } - (NSUInteger)indexForPlayButton:(UIView *)playButton { NSUInteger index = NSUIntegerMax; for (MWZoomingScrollView *page in _visiblePages) { if (page.playButton == playButton) { index = page.index; break; } } return index; } #pragma mark - Video - (void)playVideoAtIndex:(NSUInteger)index { id photo = [self photoAtIndex:index]; if ([photo respondsToSelector:@selector(getVideoURL:)]) { // Valid for playing [self clearCurrentVideo]; _currentVideoIndex = index; [self setVideoLoadingIndicatorVisible:YES atPageIndex:index]; // Get video and play __typeof(self) __weak weakSelf = self; [photo getVideoURL:^(NSURL *url) { dispatch_async(dispatch_get_main_queue(), ^{ // If the video is not playing anymore then bail __typeof(self) strongSelf = weakSelf; if (!strongSelf) return; if (strongSelf->_currentVideoIndex != index || !strongSelf->_viewIsActive) { return; } if (url) { [weakSelf _playVideo:url atPhotoIndex:index]; } else { [weakSelf setVideoLoadingIndicatorVisible:NO atPageIndex:index]; } }); }]; } } - (void)_playVideo:(NSURL *)videoURL atPhotoIndex:(NSUInteger)index { // Setup player _currentVideoPlayerViewController = [[AVPlayerViewController alloc] init]; _currentVideoPlayerViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; _currentVideoPlayerItem = [[AVPlayerItem alloc] initWithURL:videoURL]; _currentVideoPlayerViewController.player = [[AVPlayer alloc] initWithPlayerItem:_currentVideoPlayerItem]; _currentVideoPlayer = _currentVideoPlayerViewController.player; // Remove the movie player view controller from the "playback did finish" notification observers // Observe ourselves so we can get it to use the crossfade transition [[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemDidPlayToEndTimeNotification object:_currentVideoPlayerItem]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(videoFinishedCallback:) name:AVPlayerItemDidPlayToEndTimeNotification object:_currentVideoPlayerItem]; // Show [self presentViewController:_currentVideoPlayerViewController animated:YES completion:^{ [_currentVideoPlayer play]; }]; } - (void)videoFinishedCallback:(NSNotification*)notification { // Remove observer [[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemDidPlayToEndTimeNotification object:_currentVideoPlayerItem]; // Clear up [self clearCurrentVideo]; [self dismissViewControllerAnimated:YES completion:nil]; } - (void)clearCurrentVideo { [_currentVideoPlayerViewController.player pause]; [_currentVideoLoadingIndicator removeFromSuperview]; _currentVideoPlayerViewController = nil; _currentVideoLoadingIndicator = nil; _currentVideoPlayerItem = nil; [[self pageDisplayedAtIndex:_currentVideoIndex] playButton].hidden = NO; _currentVideoIndex = NSUIntegerMax; } - (void)setVideoLoadingIndicatorVisible:(BOOL)visible atPageIndex:(NSUInteger)pageIndex { if (_currentVideoLoadingIndicator && !visible) { [_currentVideoLoadingIndicator removeFromSuperview]; _currentVideoLoadingIndicator = nil; [[self pageDisplayedAtIndex:pageIndex] playButton].hidden = NO; } else if (!_currentVideoLoadingIndicator && visible) { _currentVideoLoadingIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectZero]; [_currentVideoLoadingIndicator sizeToFit]; [_currentVideoLoadingIndicator startAnimating]; [_pagingScrollView addSubview:_currentVideoLoadingIndicator]; [self positionVideoLoadingIndicator]; [[self pageDisplayedAtIndex:pageIndex] playButton].hidden = YES; } } - (void)positionVideoLoadingIndicator { if (_currentVideoLoadingIndicator && _currentVideoIndex != NSUIntegerMax) { CGRect frame = [self frameForPageAtIndex:_currentVideoIndex]; _currentVideoLoadingIndicator.center = CGPointMake(CGRectGetMidX(frame), CGRectGetMidY(frame)); } } #pragma mark - Control Hiding / Showing // If permanent then we don't set timers to hide again // Fades all controls on iOS 5 & 6, and iOS 7 controls slide and fade - (void)setControlsHidden:(BOOL)hidden animated:(BOOL)animated permanent:(BOOL)permanent { // Force visible if (![self numberOfPhotos] || _alwaysShowControls) hidden = NO; // Cancel any timers [self cancelControlHiding]; // Animations & positions CGFloat animatonOffset = 20; CGFloat animationDuration = (animated ? 0.35 : 0); // Toolbar, nav bar and captions // Pre-appear animation positions for sliding if ([self areControlsHidden] && !hidden && animated) { // Toolbar _toolbar.frame = CGRectOffset([self frameForToolbarAtOrientation:[[UIApplication sharedApplication] statusBarOrientation]], 0, animatonOffset); // Captions for (MWZoomingScrollView *page in _visiblePages) { if (page.captionView) { MWCaptionView *v = page.captionView; //TWS id photo = [self photoAtIndex:self.currentIndex]; if (photo.caption) { if ([photo caption]) v.label.text = photo.caption; } // Pass any index, all we're interested in is the Y CGRect captionFrame = [self frameForCaptionView:v atIndex:0]; captionFrame.origin.x = v.frame.origin.x; // Reset X v.frame = CGRectOffset(captionFrame, 0, animatonOffset); } } } if ([_delegate respondsToSelector:@selector(setControlsHidden:animated:permanent:)]) { [_delegate setControlsHidden:hidden animated:animated permanent:permanent]; } [UIView animateWithDuration:animationDuration animations:^(void) { CGFloat alpha = hidden ? 0 : 1; // Nav bar slides up on it's own on iOS 7+ [self.navigationController.navigationBar setAlpha:alpha]; // Toolbar _toolbar.frame = [self frameForToolbarAtOrientation:[[UIApplication sharedApplication] statusBarOrientation]]; if (hidden) _toolbar.frame = CGRectOffset(_toolbar.frame, 0, animatonOffset); _toolbar.alpha = alpha; // Captions for (MWZoomingScrollView *page in _visiblePages) { if (page.captionView) { MWCaptionView *v = page.captionView; // Pass any index, all we're interested in is the Y CGRect captionFrame = [self frameForCaptionView:v atIndex:0]; captionFrame.origin.x = v.frame.origin.x; // Reset X if (hidden) captionFrame = CGRectOffset(captionFrame, 0, animatonOffset); v.frame = captionFrame; v.alpha = alpha; } } // Selected buttons for (MWZoomingScrollView *page in _visiblePages) { if (page.selectedButton) { UIButton *v = page.selectedButton; CGRect newFrame = [self frameForSelectedButton:v atIndex:0]; newFrame.origin.x = v.frame.origin.x; v.frame = newFrame; } } } completion:^(BOOL finished) {}]; // Control hiding timer // Will cancel existing timer but only begin hiding if // they are visible if (!permanent) [self hideControlsAfterDelay]; } - (UIStatusBarStyle)preferredStatusBarStyle { return UIStatusBarStyleLightContent; } - (UIStatusBarAnimation)preferredStatusBarUpdateAnimation { return UIStatusBarAnimationSlide; } - (void)cancelControlHiding { // If a timer exists then cancel and release if (_controlVisibilityTimer) { [_controlVisibilityTimer invalidate]; _controlVisibilityTimer = nil; } } // Enable/disable control visiblity timer - (void)hideControlsAfterDelay { if (![self areControlsHidden]) { [self cancelControlHiding]; _controlVisibilityTimer = [NSTimer scheduledTimerWithTimeInterval:self.delayToHideElements target:self selector:@selector(hideControls) userInfo:nil repeats:NO]; } } - (BOOL)areControlsHidden { return (_toolbar.alpha == 0); } - (void)hideControls { [self setControlsHidden:YES animated:YES permanent:NO]; } - (void)showControls { [self setControlsHidden:NO animated:YES permanent:NO]; } - (void)toggleControls { [self setControlsHidden:![self areControlsHidden] animated:YES permanent:NO]; } #pragma mark - Properties - (void)setCurrentPhotoIndex:(NSUInteger)index { // Validate NSUInteger photoCount = [self numberOfPhotos]; if (photoCount == 0) { index = 0; } else { if (index >= photoCount) index = [self numberOfPhotos]-1; } _currentPageIndex = index; if ([self isViewLoaded]) { [self jumpToPageAtIndex:index animated:NO]; if (!_viewIsActive) [self tilePages]; // Force tiling if view is not visible } } #pragma mark - Misc - (void)doneButtonPressed:(id)sender { // Dismiss view controller if ([_delegate respondsToSelector:@selector(photoBrowserDidFinishPresentation:)]) { // Call delegate method and let them dismiss us [_delegate photoBrowserDidFinishPresentation:self]; } } #pragma mark - Delete - (void)deleteButtonPressed:(id)sender { if ([self.delegate respondsToSelector:@selector(photoBrowser:deleteButtonPressedForPhotoAtIndex:deleteButton:)]) [self.delegate photoBrowser:self deleteButtonPressedForPhotoAtIndex:_currentPageIndex deleteButton:self.deleteButton]; } #pragma mark - Share - (void)shareButtonPressed:(id)sender { if ([self.delegate respondsToSelector:@selector(photoBrowser:shareButtonPressedForPhotoAtIndex:)]) [self.delegate photoBrowser:self shareButtonPressedForPhotoAtIndex:_currentPageIndex]; } #pragma mark - Actions - (void)actionButtonPressed:(id)sender { // Only react when image has loaded id photo = [self photoAtIndex:_currentPageIndex]; if ([self numberOfPhotos] > 0 && [photo underlyingImage]) { // If they have defined a delegate method then just message them if ([self.delegate respondsToSelector:@selector(photoBrowser:actionButtonPressedForPhotoAtIndex:)]) { // Let delegate handle things [self.delegate photoBrowser:self actionButtonPressedForPhotoAtIndex:_currentPageIndex]; } else { // Show activity view controller NSMutableArray *items = [NSMutableArray arrayWithObject:[photo underlyingImage]]; if (photo.caption) { [items addObject:photo.caption]; } self.activityViewController = [[UIActivityViewController alloc] initWithActivityItems:items applicationActivities:nil]; // Show typeof(self) __weak weakSelf = self; [self.activityViewController setCompletionWithItemsHandler:^(NSString *activityType, BOOL completed, NSArray *returnedItems, NSError *activityError) { weakSelf.activityViewController = nil; [weakSelf hideControlsAfterDelay]; }]; // iOS 8 - Set the Anchor Point for the popover if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8")) { self.activityViewController.popoverPresentationController.barButtonItem = _actionButton; } [self presentViewController:self.activityViewController animated:YES completion:nil]; } // Keep controls hidden [self setControlsHidden:NO animated:YES permanent:YES]; } } @end