ios - 当 UICollectionView 滚动时，UICollectionViewCell 中的 subview 显示错误

Question

我制作了一个自定义的 UICollectionViewCell 并向其 contentView 添加了一个 subview :

BooksCell.h

@interface BooksCell : UICollectionViewCell
@property (strong, nonatomic) UIImageView *certifyImageView;
@end

BooksCell.m

- (id)initWithFrame:(CGRect)frame {
    self= [super initWithFrame:frame];
    if(self){
        _coverImageView = [[UIImageView alloc] initWithFrame:CGRectMake(15, 15, 88, 117)];
        _coverImageView.userInteractionEnabled = YES;
        [self.contentView addSubview:_coverImageView];

        UIImage *certifyImage = [UIImage imageNamed:@"13-6.png"];
        _certifyImageView = [[UIImageView alloc] initWithFrame:CGRectMake(17.5, _coverImageView.frame.size.height-3, certifyImage.size.width, certifyImage.size.height)];
        _certifyImageView.image = certifyImage;
        _certifyImageView.hidden = YES;
    }
    return self;
}

View Controller

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    BooksCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"BooksCell" forIndexPath:indexPath];
    cell.coverImageView.image = [UIImage imageNamed:@"13-5.png"];

   // **Here I want some cell display certifyImageView and some not.**
    if(indexPath.row%2==0){
        cell.certifyImageView.hidden = NO;
    }

    return cell;
}

我将 collectionView 作为 subview 添加到 Viewcontroller，并正确设置它的框架，现在 collectionView 显示了 coverImageView 和 certifyImageView 正常，但是当我滚动collectionView时，certifyImageView显示在错误的单元格上，我想这可能是Reuse Cell造成的，如何解决？

Answer 1

我认为因为它正在重用已经将 certifyImageView.hidden 设置为 NO 的单元格所以你必须将它设置回 YES也许试试这个

if(indexPath.row%2==0){
        cell.certifyImageView.hidden = NO;
    }
else{
       cell.certifyImageView.hidden = YES;
}

通过这种方式，您可以确保将 certifyImageView 设置为隐藏(如果这是您想要的)。