// // UIImage+animatedGIF // Nextcloud // // Created by Marino Faggiana on 28/05/17. // Copyright (c) 2017 Marino Faggiana. All rights reserved. // // Author Marino Faggiana // Found in Internet // // This program is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program. If not, see . // #import #import #import @interface UIImage (animatedGIF) /* UIImage *animation = [UIImage animatedImageWithAnimatedGIFData:theData]; I interpret `theData` as a GIF. I create an animated `UIImage` using the source images in the GIF. The GIF stores a separate duration for each frame, in units of centiseconds (hundredths of a second). However, a `UIImage` only has a single, total `duration` property, which is a floating-point number. To handle this mismatch, I add each source image (from the GIF) to `animation` a varying number of times to match the ratios between the frame durations in the GIF. For example, suppose the GIF contains three frames. Frame 0 has duration 3. Frame 1 has duration 9. Frame 2 has duration 15. I divide each duration by the greatest common denominator of all the durations, which is 3, and add each frame the resulting number of times. Thus `animation` will contain frame 0 3/3 = 1 time, then frame 1 9/3 = 3 times, then frame 2 15/3 = 5 times. I set `animation.duration` to (3+9+15)/100 = 0.27 seconds. */ + (UIImage *)animatedImageWithAnimatedGIFData:(NSData *)theData; /* UIImage *image = [UIImage animatedImageWithAnimatedGIFURL:theURL]; I interpret the contents of `theURL` as a GIF. I create an animated `UIImage` using the source images in the GIF. I operate exactly like `+[UIImage animatedImageWithAnimatedGIFData:]`, except that I read the data from `theURL`. If `theURL` is not a `file:` URL, you probably want to call me on a background thread or GCD queue to avoid blocking the main thread. */ + (UIImage *)animatedImageWithAnimatedGIFURL:(NSURL *)theURL; @end