UICollectionView - 图像随机设置 [英] UICollectionView - Image is getting set randomly

问题描述

我在我的应用程序中使用 collectionView.我正在为 didSelect 委托中的单元格背景视图设置图像.但是当我选择一个单元格 indexPath 时，图像被设置为 3 个单元格 indexPath.当我滚动 collectionView 时，图像会随机更改吗?请帮我.提前致谢.

I am using collectionView in my App. I am setting image for the cell backgroundView in didSelect delegate. But When i select one cell indexPath the image is getting set for 3 cell indexPath. When i scroll the collectionView the images are getting changed randomly? Please Help me. thanks in advance.

- (void)viewDidLoad
{
    [super viewDidLoad];

    [collection registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:uio];
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:       (NSInteger)section
{
     return 50;
}

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

    UICollectionViewCell *cell = [collection dequeueReusableCellWithReuseIdentifier:uio
 forIndexPath:indexPath];
    cell.backgroundColor = [UIColor whiteColor];
   return cell;
}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
 {
    NSLog(@"index %@",indexPath);
    UICollectionViewCell *cell = [collection cellForItemAtIndexPath:indexPath];

    cell.backgroundView =[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"download.jpg"]];

 }

推荐答案

问题在于 dequeueReusableCellWithReuseIdentifier.

当您滚动 UICollectionview 时，单元格被重用，这是问题在 scrollview 中添加 Collectionview.

When you scroll UICollectionview then cell are reused that is problem add Collectionview inside scrollview.

在里面试试这个:

Scroll_View 是您的滚动视图

Scroll_View is Your Scroll View

收藏就是你的收藏视图

-(UICollectionViewCell*)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    self.Scroll_View.contentSize = CGSizeMake(self.view.frame.size.width, collectionView.contentSize.height);
    CGRect fram_For_Collection_View = self.collection_view.frame;
    fram_For_Collection_View.size.height = collectionView.contentSize.height;
    self.collection.view.frame = fram_For_Collection_View;
}

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