新增showPhotoCannotSelectLayer属性，当已选照片张数达到最大可选张数时，可像微信一样让其它照片显示一个浮层

TZImagePickerController/TZImagePickerController/TZAssetCell.h

@@ -21,6 +21,7 @@ typedef enum : NSUInteger {
 @interface TZAssetCell : UICollectionViewCell
 
 @property (weak, nonatomic) UIButton *selectPhotoButton;
+@property (weak, nonatomic) UIButton *cannotSelectLayerButton;
 @property (nonatomic, strong) TZAssetModel *model;
 @property (assign, nonatomic) NSInteger index;
 @property (nonatomic, copy) void (^didSelectPhotoBlock)(BOOL);

TZImagePickerController/TZImagePickerController/TZAssetCell.m

@@ -190,9 +190,6 @@
         imageView.clipsToBounds = YES;
         [self.contentView addSubview:imageView];
         _imageView = imageView;
-        
-        [self.contentView bringSubviewToFront:_selectImageView];
-        [self.contentView bringSubviewToFront:_bottomView];
     }
     return _imageView;
 }
@@ -219,6 +216,15 @@
     return _bottomView;
 }
 
+- (UIButton *)cannotSelectLayerButton {
+    if (_cannotSelectLayerButton == nil) {
+        UIButton *cannotSelectLayerButton = [[UIButton alloc] init];
+        [self.contentView addSubview:cannotSelectLayerButton];
+        _cannotSelectLayerButton = cannotSelectLayerButton;
+    }
+    return _cannotSelectLayerButton;
+}
+
 - (UIImageView *)videoImgView {
     if (_videoImgView == nil) {
         UIImageView *videoImgView = [[UIImageView alloc] init];
@@ -264,6 +270,7 @@
 
 - (void)layoutSubviews {
     [super layoutSubviews];
+    _cannotSelectLayerButton.frame = self.bounds;
     if (self.allowPreview) {
         _selectPhotoButton.frame = CGRectMake(self.tz_width - 44, 0, 44, 44);
     } else {
@@ -288,6 +295,12 @@
     
     self.type = (NSInteger)self.model.type;
     self.showSelectBtn = self.showSelectBtn;
+    
+    [self.contentView bringSubviewToFront:_bottomView];
+    [self.contentView bringSubviewToFront:_cannotSelectLayerButton];
+    [self.contentView bringSubviewToFront:_selectPhotoButton];
+    [self.contentView bringSubviewToFront:_selectImageView];
+    [self.contentView bringSubviewToFront:_indexLabel];
 }
 
 @end

TZImagePickerController/TZImagePickerController/TZImagePickerController.h

@@ -122,6 +122,12 @@
 /// 默认为NO，如果设置为YES，会显示照片的选中序号
 @property (assign, nonatomic) BOOL showSelectedIndex;
 
+/// Default is NO, if set YES, when selected photos's count up to maxImagesCount, other photo will show float layer what's color is cannotSelectLayerColor.
+/// 默认是NO，如果设置为YES，当照片选择张数达到maxImagesCount时，其它照片会显示颜色为cannotSelectLayerColor的浮层
+@property (assign, nonatomic) BOOL showPhotoCannotSelectLayer;
+/// Default is white color with 0.8 alpha;
+@property (strong, nonatomic) UIColor *cannotSelectLayerColor;
+
 /// The photos user have selected
 /// 用户选中过的图片数组
 @property (nonatomic, strong) NSMutableArray *selectedAssets;

TZImagePickerController/TZImagePickerController/TZImagePickerController.m

@@ -277,6 +277,7 @@
     self.barItemTextColor = [UIColor whiteColor];
     self.allowPreview = YES;
     self.statusBarStyle = UIStatusBarStyleLightContent;
+    self.cannotSelectLayerColor = [[UIColor whiteColor] colorWithAlphaComponent:0.8];
     
     self.iconThemeColor = [UIColor colorWithRed:31 / 255.0 green:185 / 255.0 blue:34 / 255.0 alpha:1.0];
     [self configDefaultBtnTitle];

TZImagePickerController/TZImagePickerController/TZPhotoPickerController.m

@@ -492,6 +492,13 @@ static CGFloat itemMargin = 5;
     cell.showSelectBtn = tzImagePickerVc.showSelectBtn;
     cell.allowPreview = tzImagePickerVc.allowPreview;
     
+    if (tzImagePickerVc.selectedModels.count >= tzImagePickerVc.maxImagesCount && tzImagePickerVc.showPhotoCannotSelectLayer && !model.isSelected) {
+        cell.cannotSelectLayerButton.backgroundColor = tzImagePickerVc.cannotSelectLayerColor;
+        cell.cannotSelectLayerButton.hidden = NO;
+    } else {
+        cell.cannotSelectLayerButton.hidden = YES;
+    }
+    
     __weak typeof(cell) weakCell = cell;
     __weak typeof(self) weakSelf = self;
     __weak typeof(_numberImageView.layer) weakLayer = _numberImageView.layer;
@@ -515,6 +522,7 @@ static CGFloat itemMargin = 5;
             if (tzImagePickerVc.showSelectedIndex) {
                 [strongSelf setUseCachedImageAndReloadData];
             }
+            [UIView showOscillatoryAnimationWithLayer:strongLayer type:TZOscillatoryAnimationToSmaller];
         } else {
             // 2. select:check if over the maxImagesCount / 选择照片,检查是否超过了最大个数的限制
             if (tzImagePickerVc.selectedModels.count < tzImagePickerVc.maxImagesCount) {
@@ -526,12 +534,15 @@ static CGFloat itemMargin = 5;
                 }
                 [tzImagePickerVc addSelectedModel:model];
                 [strongSelf refreshBottomToolBarStatus];
+                [UIView showOscillatoryAnimationWithLayer:strongLayer type:TZOscillatoryAnimationToSmaller];
             } else {
                 NSString *title = [NSString stringWithFormat:[NSBundle tz_localizedStringForKey:@"Select a maximum of %zd photos"], tzImagePickerVc.maxImagesCount];
                 [tzImagePickerVc showAlertWithTitle:title];
             }
         }
-        [UIView showOscillatoryAnimationWithLayer:strongLayer type:TZOscillatoryAnimationToSmaller];
+        if (tzImagePickerVc.showPhotoCannotSelectLayer && !tzImagePickerVc.showSelectedIndex) {
+            [strongSelf.collectionView reloadData];
+        }
     };
     return cell;
 }

TZImagePickerController/ViewController.m

@@ -250,7 +250,9 @@
     // imagePickerVc.oKButtonTitleColorDisabled = [UIColor lightGrayColor];
     // imagePickerVc.oKButtonTitleColorNormal = [UIColor greenColor];
     // imagePickerVc.navigationBar.translucent = NO;
-    imagePickerVc.iconThemeColor = [UIColor redColor];
+    imagePickerVc.iconThemeColor = [UIColor colorWithRed:31 / 255.0 green:185 / 255.0 blue:34 / 255.0 alpha:1.0];
+    imagePickerVc.showPhotoCannotSelectLayer = YES;
+    imagePickerVc.cannotSelectLayerColor = [[UIColor whiteColor] colorWithAlphaComponent:0.8];
     
     // 3. Set allow picking video & photo & originalPhoto or not
     // 3. 设置是否可以选择视频/图片/原图