complete image cache

loopeer · Sep 15, 2017 · 574919c · 574919c
1 parent d0f9c02
commit 574919c
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Showing 2 changed files with 35 additions and 6 deletions.
diff --git a/LPAlbum/Controllers/LPAlbum.swift b/LPAlbum/Controllers/LPAlbum.swift
@@ -7,12 +7,11 @@
 /**
    TODO: 1. add CompleteSelectAssetsBlock
          2. add Photo Cache
-         3. 文本国际化
-         4. 图片详情展示
+         4. 图片详情zoom
          5. 选取单个图片的情形
          6. 支持裁剪(正方形, 圆形)
          7. take photo statusBarAnimation 
-         8. 是否要加Observer
+         8. 是否要加Observer, 如果有Observer, 图片添加或者删除了, 要响应的添加或删除该图片的缓存
          9. 完善demo(照片墙, 权限跳转)
         10. 加一些动画效果
         11. 添加注释
@@ -41,7 +40,15 @@ public class LPAlbum: UIViewController {
 
     fileprivate var currentAlbumIndex: Int = 0
     fileprivate var albumModels = [AlbumModel]()
-
+    fileprivate var allAssets = [PHAsset]() {
+        didSet{
+            //如果有Observer, 图片添加或者删除了, 要响应的添加或删除该图片的缓存
+            let itemSize = (collectionView.collectionViewLayout as! UICollectionViewFlowLayout).itemSize
+            let scale = UIScreen.main.scale
+            let targetSize = CGSize(width: itemSize.width * scale, height: itemSize.height * scale)
+            AlbumManager.imageManager.startCachingImages(for: allAssets, targetSize: targetSize, contentMode: .aspectFill, options: nil)
+        }
+    }
 
     @discardableResult
     public class func show(at: UIViewController, set: SetConfigBlock? = nil) -> LPAlbum {
@@ -93,6 +100,8 @@ public class LPAlbum: UIViewController {
 
         albumModels = AlbumManager.getAlbums()
         setupUI()
+        allAssets = albumModels[0].assetModels.map{ $0.asset }
+
         titleView.clickAction = { [weak self] in
             $0.isSelected = !$0.isSelected
             $0.isSelected ?

diff --git a/LPAlbum/Controllers/PhotosPreviewController.swift b/LPAlbum/Controllers/PhotosPreviewController.swift
@@ -18,13 +18,17 @@ class PhotosPreviewController: UIViewController {
     fileprivate var collectionView: UICollectionView!
     fileprivate let itemPadding: CGFloat = 20.0
     fileprivate let chooseButton = UIButton()
+    fileprivate var itemSize: CGSize!
 
     override func viewDidLoad() {
         super.viewDidLoad()
         setupUI()
+        addCache()
     }
+
     deinit {
         print("\(self) deinit")
+        removeCache()
     }
 }
 
@@ -42,7 +46,7 @@ extension PhotosPreviewController {
         navigationItem.rightBarButtonItem = UIBarButtonItem(customView: chooseButton)
 
         let layout = UICollectionViewFlowLayout()
-        let itemSize = CGSize(width: view.bounds.width + 20, height: view.bounds.height - 64)
+        itemSize = CGSize(width: view.bounds.width + 20, height: view.bounds.height - 64)
         layout.itemSize = itemSize
         layout.minimumLineSpacing = 0
         layout.minimumInteritemSpacing = 0
@@ -56,9 +60,25 @@ extension PhotosPreviewController {
         view.addSubview(collectionView)
         collectionView.register(PhotoPreviewCell.self, forCellWithReuseIdentifier: PhotoPreviewCell.description())
         collectionView.performBatchUpdates(nil){ _ in
-            self.collectionView.setContentOffset(CGPoint(x: itemSize.width * self.currentIndex.cgFloat, y: 0), animated: false)
+            self.collectionView.setContentOffset(CGPoint(x: self.itemSize.width * self.currentIndex.cgFloat, y: 0), animated: false)
         }
     }
+
+    func addCache() {
+        let scale = UIScreen.main.scale
+        AlbumManager.imageManager.startCachingImages(for: assetModels.map{ $0.asset },
+                                                     targetSize: CGSize(width: itemSize.width * scale, height: itemSize.height * scale),
+                                                     contentMode: .aspectFill,
+                                                     options: nil)
+    }
+    func removeCache() {
+        let scale = UIScreen.main.scale
+        AlbumManager.imageManager.stopCachingImages(for: assetModels.map{ $0.asset },
+                                                    targetSize: CGSize(width: itemSize.width * scale, height: itemSize.height * scale),
+                                                    contentMode: .aspectFill,
+                                                    options: nil)
+    }
+
     func chooseClick() {
         chooseAction?(currentIndex, chooseButton, self)
     }