我是新建筑 UICollectionView ，我有一个问题。我想显示宽度为 300 像素的图像并计算正确的高度比例。为此，我做了：
- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath {
UICollectionViewCell *cell = [cv dequeueReusableCellWithReuseIdentifier:@"MyCell" forIndexPath:indexPath];
UIImage *image = [photos objectAtIndex:indexPath.row];
if(image){
UIImageView *imageView = [[UIImageView alloc]initWithImage:image];
float scale = (image.size.height/image.size.width)*300;
[imageView setFrame:CGRectMake(imageView.frame.origin.x, imageView.frame.origin.y, 300, scale )];
[cell addSubview:imageView];
cell.backgroundColor = [UIColor clearColor];
}else{
cell.backgroundColor = [UIColor redColor];
}
return cell;
}
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
UIImage *image = [photos objectAtIndex:indexPath.row];
float scale = (image.size.height/image.size.width)*300;
return CGSizeMake(300, scale);
}
这似乎在一开始就有效，但是一旦我向下滚动，图像就会开始相互重叠。这是避免这种情况的任何方法吗？
