UICollectionView 单元格未在 reloadData 上清除

Posted 2023-03-13

【中文标题】UICollectionView 单元格未在 reloadData 上清除

【英文标题】：UICollectionView Cells not clearing on reloadData

【发布时间】：2014-06-05 10:35:01

【问题描述】：

我遇到了与这些类似的问题，但似乎无法解决我的问题..

UICollectionView reload data Issue ios UICollectionView cells not refreshing after scroll UILabel overloading in UICollectionView

我在cell 中有一个带有自定义UIViews 的CollectionView，在reloadData 上，它重新添加了自定义UIViews，而不是删除已经显示的那些。这是我的 cellForItemAtIndexPath...

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath 
UICollectionViewCell *collectionViewCell = [collectionView dequeueReusableCellWithReuseIdentifier:@"LiveTileCell" forIndexPath:indexPath];

NSDictionary *cellDataDictionary = [self.dataArray objectAtIndex:indexPath.row];
UIView *customView = [[UIView alloc] initWithFrame:collectionViewCell.contentView.frame];
customView.tag = 1002;


LiveTileView *liveTile = [[LiveTileView alloc] initWithFrame:CGRectMake(0, 0, collectionViewCell.frame.size.width, collectionViewCell.frame.size.height)];
liveTile.tag = 1001;

[liveTile initialize:[cellDataDictionary valueForKey:@"backgroundColor"] titleFont:[cellDataDictionary valueForKey:@"titleFont"] titleText:[cellDataDictionary valueForKey:@"titleText"] titleColor:[UIColor whiteColor] titleImage:[cellDataDictionary valueForKey:@"titleImage"] badge:[[cellDataDictionary valueForKey:@"badge"] intValue] detailViewImage:[cellDataDictionary valueForKey:@"detailViewImage"] compactView:nil isLiveTile:[[cellDataDictionary valueForKey:@"isLiveTile"] boolValue] animationTime:[[cellDataDictionary valueForKey:@"animationTime"] floatValue] elementIndex:indexPath.item];

[customView addSubview:liveTile];
[collectionViewCell addSubview:customView];

return collectionViewCell;

任何帮助都会很棒..提前感谢

【参考方案1】：

试试这个

UICollectionViewCell *collectionViewCell = [collectionView dequeueReusableCellWithReuseIdentifier:@"LiveTileCell" forIndexPath:indexPath]; 


//    for(UIView *view in collectionViewCell.contentView.subviews)

 for(UIView *view in collectionViewCell.subviews)
 
    for(UIView *subView in view.subviews)
    

        [subView removeFromSuperview];
    
    [view removeFromSuperview];

// write your code here

【讨论】：

为什么会这样？它正在删除您现有的视图，然后添加您的新自定义视图。

让它工作了.. 将collectionViewCell.contentView.subviews 更改为collectionViewCell.subviews，现在它工作得很好:) 谢谢