Merge pull request #115 from Arthurli/feature-recover-cells

当图片划出屏幕的时候 恢复 cell 缩放状态

TZImagePickerController/TZImagePickerController/TZPhotoPreviewCell.h

@@ -14,4 +14,6 @@
 @property (nonatomic, strong) TZAssetModel *model;
 @property (nonatomic, copy) void (^singleTapGestureBlock)();
 
+- (void)recoverSubviews;
+
 @end

TZImagePickerController/TZImagePickerController/TZPhotoPreviewCell.m

@@ -69,6 +69,11 @@
     }];
 }
 
+- (void)recoverSubviews {
+    [_scrollView setZoomScale:1.0 animated:NO];
+    [self resizeSubviews];
+}
+
 - (void)resizeSubviews {
     _imageContainerView.tz_origin = CGPointZero;
     _imageContainerView.tz_width = self.tz_width;

TZImagePickerController/TZImagePickerController/TZPhotoPreviewController.m

@@ -274,6 +274,20 @@
     return cell;
 }
 
+- (void)collectionView:(UICollectionView *)collectionView willDisplayCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath
+{
+    if ([cell isKindOfClass:[TZPhotoPreviewCell class]]) {
+        [(TZPhotoPreviewCell *)cell recoverSubviews];
+    }
+}
+
+- (void)collectionView:(UICollectionView *)collectionView didEndDisplayingCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath
+{
+    if ([cell isKindOfClass:[TZPhotoPreviewCell class]]) {
+        [(TZPhotoPreviewCell *)cell recoverSubviews];
+    }
+}
+
 #pragma mark - Private Method
 
 - (void)refreshNaviBarAndBottomBarState {