iOS UICollectionView内存泄漏

Question

我已经通过故事板创建了UICollectionView。 我的单元格是自定义单元格类，它有3个带图像的按钮。 我的图像可作为类GalleryItemInfo的一部分。我有那些对象的数组

[GalleryDataProvider sharedInstance].itemInfo 

没有为cellForItemAtIndexPath代码（在一个小区内有在阵列三个项目三个按钮）：

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath 
{ 
    CollectionViewCellPreviewTriple *cell; 

    if (indexPath.row % 2 == 0 && !is_iPhone) { 
     cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cellOrangeRed" forIndexPath:indexPath]; 
     if (is_Fingerprint_Version) { 
      cell.imageViewRope.image = [UIImage imageNamed:@"image-rope-1.png"]; 
     } 
    } else { 
     cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cellGreenBlue" forIndexPath:indexPath]; 
     if (is_Fingerprint_Version) { 
      cell.imageViewRope.image = [UIImage imageNamed:@"image-rope-2.png"]; 
     } 
    } 

    cell.previewCellDelegate = self; 
    cell.tag = indexPath.row; 
    NSInteger leftPreviedId = [cell firstPreviewId]; 
    self.leftPreviewedID = leftPreviedId; 

    UIImage *image1 = ((GalleryItemInfo *)[[GalleryDataProvider sharedInstance].itemInfo objectAtIndex:leftPreviedId]).slotPreviewImage; 
    UIImage *image2; 
    UIImage *image3; 

    if (leftPreviedId + 1 < [[GalleryDataProvider sharedInstance].itemInfo count]) 
     image2 = ((GalleryItemInfo *)[[GalleryDataProvider sharedInstance].itemInfo objectAtIndex:leftPreviedId + 1]).slotPreviewImage; 

    if (leftPreviedId + 2 < [[GalleryDataProvider sharedInstance].itemInfo count]) 
     image3 = ((GalleryItemInfo *)[[GalleryDataProvider sharedInstance].itemInfo objectAtIndex:leftPreviedId + 2]).slotPreviewImage; 

    [cell setupWithImage1:image1 image2:image2 image3:image3]; 

    if (self.isEditModeEnabled) { 
     [cell showRemoveButtons]; 
    } else { 
     [cell hideRemoveButtons]; 
    } 

    return cell; 
} 

麻烦：当我滚动我收藏的内存使用情况约1兆字节从右向左增加每次刷卡。

为什么内存不释放？

更新：

CollectionViewCellPreviewTriple代码（通过故事板创建）：

#import <UIKit/UIKit.h> 

@protocol UICollectionViewPreviewCellDelegate; 


@interface CollectionViewCellPreviewTriple : UICollectionViewCell 

@property (weak, nonatomic) IBOutlet UIButton *buttonSlot1; 
@property (weak, nonatomic) IBOutlet UIButton *buttonSlot2; 
@property (weak, nonatomic) IBOutlet UIButton *buttonSlot3; 
@property (weak, nonatomic) IBOutlet UIButton *buttonRemove1; 
@property (weak, nonatomic) IBOutlet UIButton *buttonRemove2; 
@property (weak, nonatomic) IBOutlet UIButton *buttonRemove3; 
@property (weak, nonatomic) IBOutlet UIImageView *imageViewRope; 


@property (nonatomic, weak) id<UICollectionViewPreviewCellDelegate> previewCellDelegate; 

- (void)setupWithImage1:(UIImage *)image1 image2:(UIImage *)image2 image3:(UIImage *)image3; 
- (void)showRemoveButtons; 
- (void)hideRemoveButtons; 

- (NSInteger)firstPreviewId; 

@end 


@protocol UICollectionViewPreviewCellDelegate 

- (void)collectionViewPreviewCell:(CollectionViewCellPreviewTriple *)collectionViewCell didSelectSubitemWithIndex:(NSInteger)subitemIndex; 
- (void)collectionViewPreviewCell:(CollectionViewCellPreviewTriple *)collectionViewCell didEditModeRequestWithStatus:(BOOL)status; 
- (void)collectionViewPreviewCell:(CollectionViewCellPreviewTriple *)collectionViewCell didRemoveRequestWithIndex:(NSInteger)subitemIndex; 
- (void)slotButtonRequestsShadow:(UIButton *)slotButton; 

@end 

更新：

- (void)setupWithImage1:(UIImage *)image1 image2:(UIImage *)image2 image3:(UIImage *)image3 
{ 
    [self.buttonSlot1 setBackgroundImage:image1 forState:UIControlStateNormal]; 
    [self.buttonSlot1 setBackgroundImage:image1 forState:UIControlStateHighlighted]; 

    //if (image2) { 
    [self.buttonSlot2 setBackgroundImage:image2 forState:UIControlStateNormal]; 
    [self.buttonSlot2 setBackgroundImage:image2 forState:UIControlStateHighlighted]; 
    [self.buttonSlot2 setHidden:(image2 == nil)]; 
    //} 
    //if (image3) { 
    [self.buttonSlot3 setBackgroundImage:image3 forState:UIControlStateNormal]; 
    [self.buttonSlot3 setBackgroundImage:image3 forState:UIControlStateHighlighted]; 
    [self.buttonSlot3 setHidden:(image3 == nil)]; 
    //} 
} 

仿形 link for screen

Answer 1

这可能与许多人在细胞没有被重复使用时所遭受的问题有关。

要进行测试，您应该覆盖的方法prepareForReuse和它写一个非常简单的日志：

NSLog(@"%@ is being called as expected.", NSStringFromSelector(_cmd)); 

您应该然后运行你的应用程序，滚动集合视图，并检查控制台来看看这个日志出现。

如果未出现此日志，您可能需要check this answer以获得有关如何继续的帮助。在我的应用程序中，单元不在模拟器中重用，但在设备上重用。这很古怪。