我有一个UICollectionView,我以编程方式创建.我希望收集视图的行为方式如下：
1. User touches cell 2. Cell background color changes 3. User releases touch 4. Cell background color changes
这应该是一个快速的颜色变化,恰好在选择器与执行抽头操作相关的选项之前发生,其中包含集合视图的视图控制器从堆栈中弹出.
我一直在看这个问题：UICollectionView cell change background while tap
// Methods for notification of selection/deselection and highlight/unhighlight events. // The sequence of calls leading to selection from a user touch is: // // (when the touch begins) // 1. -collectionView:shouldHighlightItemAtIndexPath: // 2. -collectionView:didHighlightItemAtIndexPath: // // (when the touch lifts) // 3. -collectionView:shouldSelectItemAtIndexPath: or - collectionView:shouldDeselectItemAtIndexPath: // 4. -collectionView:didSelectItemAtIndexPath: or -collectionView:didDeselectItemAtIndexPath: // 5. -collectionView:didUnhighlightItemAtIndexPath:
我假设我只需要从“触摸开始”和“触摸结束”时执行上述方法之一.但是无论我做什么,看起来背景颜色都会发生变化,然后再改变.这是我尝试的一些不起作用的例子：
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
//pop vc
}
- (void)collectionView:(UICollectionView *)collectionView didHighlightItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell* cell = [collectionView cellForItemAtIndexPath:indexPath];
cell.contentView.backgroundColor = [UIColor redColor];
}
- (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
cell.contentView.backgroundColor = [UIColor greenColor];
}
这将导致单元格背景颜色仅更改为红色.我也看了这个问题：UICollectionView Select and Deselect issue并尝试实现[UICollectionView selectItemAtIndexPath：animated：scrollPosition：]并在didSelectItemAtIndexPath内调用它,但是这也没有.集合视图数据源和委托设置.
解决方法
问题在于,您正在更改亮点上的颜色,并将其更改为取消选择,而不是在高亮度上
你应该简单地改变一下：
- (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
cell.contentView.backgroundColor = [UIColor greenColor];
}
到这个：
- (void)collectionView:(UICollectionView *)collectionView didUnhighlightItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
cell.contentView.backgroundColor = [UIColor greenColor];
}
另外,如果您不希望稍等一下让您的高亮发生,您应该将集合视图的delayedContentTouches属性设置为NO
编辑：也确保你打电话
[collectionView deselectItemAtIndexPath:indexPath animated:NO];
在-didSelectItemAtIndexPath方法中
