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+//
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+// NCViewerPDFSearch.swift
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+// Nextcloud
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+//
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+// Created by Marino Faggiana on 23/03/2020.
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+// Copyright © 2020 Marino Faggiana. All rights reserved.
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+//
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+// Author Marino Faggiana <marino.faggiana@nextcloud.com>
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+//
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+// This program is free software: you can redistribute it and/or modify
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+// it under the terms of the GNU General Public License as published by
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+// the Free Software Foundation, either version 3 of the License, or
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+// (at your option) any later version.
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+//
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+// This program is distributed in the hope that it will be useful,
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+// but WITHOUT ANY WARRANTY; without even the implied warranty of
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+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+// GNU General Public License for more details.
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+//
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+// You should have received a copy of the GNU General Public License
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+// along with this program. If not, see <http://www.gnu.org/licenses/>.
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+//
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+
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+import Foundation
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+import PDFKit
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+
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+@available(iOS 11, *)
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+
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+@objc protocol NCViewerPDFSearchDelegate : class {
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+ func searchPdfSelection(_ pdfSelection: PDFSelection)
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+}
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+
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+@available(iOS 11, *)
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+
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+class NCViewerPDFSearch: UITableViewController, UISearchBarDelegate, PDFDocumentDelegate {
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+
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+ var searchBar = UISearchBar()
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+ var pdfDocument: PDFDocument?
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+ var searchResultArray = [PDFSelection]()
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+
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+ weak var delegate: NCViewerPDFSearchDelegate?
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+
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+ //MARK: - LifeCycle
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+
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+ override func viewDidLoad() {
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+ super.viewDidLoad()
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+
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+ searchBar.delegate = self
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+ searchBar.sizeToFit()
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+ searchBar.searchBarStyle = .minimal
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+
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+ navigationItem.titleView = searchBar
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+
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+ tableView.dataSource = self
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+ tableView.delegate = self
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+ tableView.register(UINib.init(nibName: "NCViewerPDFSearchCell", bundle: nil), forCellReuseIdentifier: "Cell")
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+ }
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+
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+ override func viewWillAppear(_ animated: Bool) {
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+ super.viewWillAppear(animated)
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+ searchBar.becomeFirstResponder()
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+ }
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+
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+ //MARK: - UITableView DataSource / Delegate
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+
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+ override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
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+ return 82
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+ }
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+
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+ override func numberOfSections(in tableView: UITableView) -> Int {
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+ return 1
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+ }
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+
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+ override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
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+ return self.searchResultArray.count
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+ }
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+
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+ override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
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+
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+ let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! NCViewerPDFSearchCell
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+ let pdfSelection = searchResultArray[indexPath.row] as PDFSelection
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+ if let pdfOutline = pdfDocument?.outlineItem(for: pdfSelection) {
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+ cell.outlineLabel.text = pdfOutline.label
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+ }
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+ let pdfPage = pdfSelection.pages.first
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+ cell.pageNumberLabel.text = "Page: " + (pdfPage?.label ?? "")
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+
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+ let extendSelection = pdfSelection.copy() as! PDFSelection
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+ extendSelection.extend(atStart: 10)
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+ extendSelection.extend(atEnd: 90)
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+ extendSelection.extendForLineBoundaries()
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+
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+ let nsRange = NSString(string: extendSelection.string!).range(of: pdfSelection.string!, options: String.CompareOptions.caseInsensitive)
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+ if nsRange.location != NSNotFound {
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+
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+ let attributedSubString = NSAttributedString.init(string: NSString(string: extendSelection.string!).substring(with: nsRange), attributes: [NSAttributedString.Key.font : UIFont.boldSystemFont(ofSize: 17)])
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+ let attributedString = NSMutableAttributedString.init(string: extendSelection.string!)
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+ attributedString.replaceCharacters(in: nsRange, with: attributedSubString)
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+ cell.searchResultTextLabel.attributedText = attributedString
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+ }
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+
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+ return cell
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+ }
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+
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+ override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
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+
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+ let pdfSelection = searchResultArray[indexPath.row]
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+ delegate?.searchPdfSelection(pdfSelection)
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+ dismiss(animated: true)
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+ }
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+
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+ //MARK: - PDFSelection Delegate
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+
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+ func didMatchString(_ instance: PDFSelection) {
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+ searchResultArray.append(instance)
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+ tableView.reloadData()
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+ }
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+
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+ //MARK: - UIScrollView Delegate
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+
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+ override func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
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+ searchBar.resignFirstResponder()
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+ }
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+
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+ //MARK: - UISearchBarDelegate
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+
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+ func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
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+ searchBar.resignFirstResponder()
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+ }
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+
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+ func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
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+ pdfDocument?.cancelFindString()
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+ navigationItem.setRightBarButton(nil, animated: false)
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+ dismiss(animated: true)
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+ }
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+
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+ func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
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+ if searchText.count < 2 { return }
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+
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+ searchResultArray.removeAll()
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+ tableView.reloadData()
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+ pdfDocument?.cancelFindString()
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+ pdfDocument?.delegate = self
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+ pdfDocument?.beginFindString(searchText, withOptions: .caseInsensitive)
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+ }
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+
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+ func searchBarShouldBeginEditing(_ searchBar: UISearchBar) -> Bool {
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+
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+ let cancelBarButtonItem = UIBarButtonItem.init(title: "Cancel", style: .plain, target: self, action: #selector(cancelBarButtonItemClicked))
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+ navigationItem.setRightBarButton(cancelBarButtonItem, animated: true)
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+ return true
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+ }
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+
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+ @objc func cancelBarButtonItemClicked() {
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+ searchBarCancelButtonClicked(searchBar)
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+ }
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+}
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+
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+class NCViewerPDFSearchCell: UITableViewCell {
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+
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+ @IBOutlet weak var outlineLabel: UILabel!
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+ @IBOutlet weak var pageNumberLabel: UILabel!
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+ @IBOutlet weak var searchResultTextLabel: UILabel!
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+
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+ override func awakeFromNib() {
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+ super.awakeFromNib()
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+ }
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+}
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+
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marinofaggiana