Merge pull request #317 from jadar/master

Add option to request lower resolution images from PHPhotoLibary

Author: zenangst

Source/AssetManager.swift

@@ -36,10 +36,10 @@ open class AssetManager {
     }
   }
 
-  open static func resolveAsset(_ asset: PHAsset, size: CGSize = CGSize(width: 720, height: 1280), completion: @escaping (_ image: UIImage?) -> Void) {
+  open static func resolveAsset(_ asset: PHAsset, size: CGSize = CGSize(width: 720, height: 1280), shouldPreferLowRes: Bool = false, completion: @escaping (_ image: UIImage?) -> Void) {
     let imageManager = PHImageManager.default()
     let requestOptions = PHImageRequestOptions()
-    requestOptions.deliveryMode = .highQualityFormat
+    requestOptions.deliveryMode = shouldPreferLowRes ? .fastFormat : .highQualityFormat
     requestOptions.isNetworkAccessAllowed = true
 
     imageManager.requestImage(for: asset, targetSize: size, contentMode: .aspectFill, options: requestOptions) { image, info in

Source/Configuration.swift

@@ -52,6 +52,7 @@ import UIKit
   @objc public var allowPinchToZoom = true
   @objc public var allowedOrientations = UIInterfaceOrientationMask.all
   @objc public var allowVolumeButtonsToTakePicture = true
+  @objc public var useLowResolutionPreviewImage = false
 
   // MARK: Images
   @objc public var indicatorView: UIView = {

Source/ImageGallery/ImageGalleryView.swift

@@ -231,7 +231,7 @@ extension ImageGalleryView: UICollectionViewDelegate {
 
     let asset = assets[(indexPath as NSIndexPath).row]
 
-    AssetManager.resolveAsset(asset, size: CGSize(width: 100, height: 100)) { image in
+    AssetManager.resolveAsset(asset, size: CGSize(width: 100, height: 100), shouldPreferLowRes: configuration.useLowResolutionPreviewImage) { image in
       guard image != nil else { return }
 
       if cell.selectedImageView.image != nil {

Source/ImageGallery/ImageGalleryViewDataSource.swift

@@ -17,7 +17,7 @@ extension ImageGalleryView: UICollectionViewDataSource {
 
     let asset = assets[(indexPath as NSIndexPath).row]
 
-    AssetManager.resolveAsset(asset, size: CGSize(width: 160, height: 240)) { image in
+    AssetManager.resolveAsset(asset, size: CGSize(width: 160, height: 240), shouldPreferLowRes: configuration.useLowResolutionPreviewImage) { image in
       if let image = image {
         cell.configureCell(image)