将单元出队时，iOS7 UICollectionViewCell不被重用

Question

the method

-(void)prepareForReuse 

In my collection view cell is never called - leading me to suspect that the UICollectionView is not dequeuing cells properly. This is causing lagyness and memory issues.

I've set up my collectionView as follows:

static NSString *cellIdentifier = @"Mycell";
-(void)initMyView
{
    [self.collectionView registerClass:[UrlLoadableCollectionViewCell class] forCellWithReuseIdentifier:cellIdentifier];
}

-(UICollectionViewCell*)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
            UrlLoadableCollectionViewCell *cell = [self.collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:index];
    if (cell.contentView.frame.size.width < 100) // tried removing this as well but didn't help
    {
        cell.layer.shouldRasterize = YES;
        cell.layer.rasterizationScale = [UIScreen mainScreen].scale;
    } else {
        cell.layer.shouldRasterize = NO;
    }
                // prepare cell
}

EDIT

Additional Code

static NSString *cellIdentifier = @"Mycell";

@interface UIThumbnailGalleryView
@property (nonatomic,strong) UICollectionView *collectionView;

@end


@implementation UIThumbnailGalleryView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self initView:frame];

    }
    return self;
}
-(void)initView:(CGRect)frame
{
    self.collectionView = [[UICollectionView alloc] initWithFrame:self.bounds collectionViewLayout:[self getGalleryLayout]];

    [self.collectionView registerClass:[UrlLoadableCollectionViewCell class] forCellWithReuseIdentifier:cellIdentifier];
    self.collectionView.delegate = self;
    self.collectionView.dataSource = self;
    self.collectionView.autoresizingMask = UIViewAutoresizingFlexibleHeight;
    [self addSubview:self.collectionView];
    self.collectionView.backgroundColor = [UIColor blackColor];
    [self.collectionView setShowsHorizontalScrollIndicator:NO];
    [self.collectionView setShowsVerticalScrollIndicator:NO];
}


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

    UrlLoadableCollectionViewCell *cell = [self.dequeueReusableCellAtIndex:indexPath];
}

-(UrlLoadableCollectionViewCell *)dequeueReusableCellAtIndex:(NSIndexPath *)index
{
    UrlLoadableCollectionViewCell *cell = (UrlLoadableCollectionViewCell *)[self.collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:index];
    return cell;
}

-(UICollectionViewFlowLayout *)getGalleryLayout
{

        UICollectionViewFlowLayout *galleryLayout = [[UICollectionViewFlowLayout alloc] init];
        [galleryLayout setItemSize:CGSizeMake(77, 77)];
        galleryLayout.minimumInteritemSpacing = 3.0;
        galleryLayout.minimumLineSpacing = 3.0;
        // iOS 6 - might need to uncomment
        //[galleryLayout setSectionInset:UIEdgeInsetsMake(44,5, 44, 5)];

    return galleryLayout;
}

Answer 1

Please post a screenshot of the xib/scene that contains your UICollectionViewCell showing it's inspector. Or, if you're cell is constructed entirely in code, post the relevant code that registers your class with the collection view. Usually when this occurs it's because of a typo in the Cell Identifier.

Answer 2

您似乎没有在任何地方调用initMyView 。