UICollectionView 只显示第一项

Question

我正在做一个类似于视频专辑的项目。我UICollectionView用来显示这些视频的拇指图像。最糟糕的是我不应该使用故事板或 xib 文件。我试图以编程方式做到这一点。我目前正在处理此代码：

- (void)viewDidLoad
{
    i = 0;

    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
    [layout setItemSize:CGSizeMake(self.view.frame.size.width/2.5,self.view.frame.size.width/2.5)];

    collectionView = [[UICollectionView alloc] initWithFrame:self.view.frame collectionViewLayout:layout];
    [collectionView setDataSource:self];
    [collectionView setDelegate:self];
    collectionView.backgroundColor = [UIColor whiteColor];
    [collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"MyCell"];

    [self.view addSubview:collectionView];

    [super viewDidLoad];
}

我已经给了 1 以返回numberOfSectionsInCollectionView和[myArray count]返回numberOfItemsInSection.

-(UICollectionViewCell *) collectionView:(UICollectionView *)cV cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
   UICollectionViewCell *cell = [cV dequeueReusableCellWithReuseIdentifier:@"MyCell" forIndexPath:indexPath];
    cell.backgroundColor = [UIColor blackColor];

    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(cell.frame.origin.x , cell.frame.origin.y, cell.frame.size.width, (cell.frame.size.height - cell.frame.size.height/3))];

    cell.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(cell.frame.origin.x , cell.frame.origin.y, cell.frame.size.width, (cell.frame.size.height - cell.frame.size.height/3))];

    imageView.image = [UIImage imageNamed:[storeData objectAtIndex:i]];

    [cell addSubview:imageView];

    i++;

    return cell;
}

我已经重新检查了myArray. 当视图加载时，集合视图只显示第一张图像。其他 4 个单元格为空。我的代码有什么问题？

Answer 1

对于那些遇到这个问题的人来说，frame是关键。我遇到了这个并改变了：

cell.imageView.frame = cell.frame;

进入

cell.imageView.frame = cell.bounds;

操作正在使用：

cell.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(cell.frame.origin.x , cell.frame.origin.y, cell.frame.size.width, (cell.frame.size.height - cell.frame.size.height/3))];

这就是为什么发生这种情况。