Trịnh Văn Quân / morooka - ios

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App/camera/ALCameraLib/ViewController/PhotoLibraryViewController.swift 4.77 KB
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1341bf603   Trịnh Văn Quân   version 1.1 
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  //
  //  ALImagePickerViewController.swift
  //  ALImagePickerViewController
  //
  //  Created by Alex Littlejohn on 2015/06/09.
  //  Copyright (c) 2015 zero. All rights reserved.
  //
  
  import UIKit
  import Photos
  
  internal let ImageCellIdentifier = "ImageCell"
  
  internal let defaultItemSpacing: CGFloat = 1
  
  public typealias PhotoLibraryViewSelectionComplete = (PHAsset?) -> Void
  
  public class PhotoLibraryViewController: UIViewController {
      
      internal var assets: PHFetchResult<PHAsset>? = nil
      
      public var onSelectionComplete: PhotoLibraryViewSelectionComplete?
      
      private lazy var collectionView: UICollectionView = {
          let layout = UICollectionViewFlowLayout()
          
          layout.itemSize = CameraGlobals.shared.photoLibraryThumbnailSize
          layout.minimumInteritemSpacing = defaultItemSpacing
          layout.minimumLineSpacing = defaultItemSpacing
          layout.sectionInset = UIEdgeInsets.zero
        
          let collectionView = UICollectionView(frame: CGRect.zero, collectionViewLayout: layout)
          collectionView.translatesAutoresizingMaskIntoConstraints = false
          collectionView.backgroundColor = UIColor.clear
          return collectionView
      }()
      
      public override func viewDidLoad() {
          super.viewDidLoad()
          
          setNeedsStatusBarAppearanceUpdate()
          
          let buttonImage = UIImage(named: "libraryCancel", in: CameraGlobals.shared.bundle, compatibleWith: nil)?.withRenderingMode(UIImageRenderingMode.alwaysOriginal)
          
          navigationItem.leftBarButtonItem = UIBarButtonItem(image: buttonImage,
                                                             style: UIBarButtonItemStyle.plain,
                                                             target: self,
                                                             action: #selector(dismissLibrary))
          
          view.backgroundColor = UIColor(white: 0.2, alpha: 1)
          view.addSubview(collectionView)
          
          _ = ImageFetcher()
              .onFailure(onFailure)
              .onSuccess(onSuccess)
              .fetch()
      }
      
      public override func viewWillLayoutSubviews() {
          super.viewWillLayoutSubviews()
          collectionView.frame = view.bounds
      }
      
      public override var preferredStatusBarStyle: UIStatusBarStyle {
          return UIStatusBarStyle.lightContent
      }
      
      public func present(_ inViewController: UIViewController, animated: Bool) {
          let navigationController = UINavigationController(rootViewController: self)
          navigationController.navigationBar.barTintColor = UIColor.black
          navigationController.navigationBar.barStyle = UIBarStyle.black
          inViewController.present(navigationController, animated: animated, completion: nil)
      }
      
      public func dismissLibrary() {
          onSelectionComplete?(nil)
      }
      
      private func onSuccess(_ photos: PHFetchResult<PHAsset>) {
          assets = photos
          configureCollectionView()
      }
      
      private func onFailure(_ error: NSError) {
          let permissionsView = PermissionsView(frame: view.bounds)
          permissionsView.titleLabel.text = localizedString("permissions.library.title")
          permissionsView.descriptionLabel.text = localizedString("permissions.library.description")
          
          view.addSubview(permissionsView)
      }
      
      private func configureCollectionView() {
          collectionView.register(ImageCell.self, forCellWithReuseIdentifier: ImageCellIdentifier)
          collectionView.delegate = self
          collectionView.dataSource = self
      }
      
      internal func itemAtIndexPath(_ indexPath: IndexPath) -> PHAsset? {
          return assets?[(indexPath as NSIndexPath).row]
      }
  }
  
  // MARK: - UICollectionViewDataSource -
  extension PhotoLibraryViewController : UICollectionViewDataSource {
      public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
          return assets?.count ?? 0
      }
  
      @objc(collectionView:willDisplayCell:forItemAtIndexPath:) public func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
          if cell is ImageCell {
              if let model = itemAtIndexPath(indexPath) {
                  (cell as! ImageCell).configureWithModel(model)
              }
          }
      }
  
      public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
          return collectionView.dequeueReusableCell(withReuseIdentifier: ImageCellIdentifier, for: indexPath)
      }
  }
  
  // MARK: - UICollectionViewDelegate -
  extension PhotoLibraryViewController : UICollectionViewDelegateFlowLayout {
      public func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
          onSelectionComplete?(itemAtIndexPath(indexPath))
      }
  }