[英]UICollectionView adding button to cell
我在集合视图的单元格中添加一个按钮,如下所示
- (void)activateDeletionMode:(UILongPressGestureRecognizer *)gr
{
if (gr.state == UIGestureRecognizerStateBegan)
{
NSLog(@"deletion mode");
if(self.isDeleteActive == NO){
self.isDeleteActive = YES;
NSIndexPath *indexPath = [self.collectionView indexPathForItemAtPoint:[gr locationInView:self.collectionView]];
UICollectionViewCell *cell = [self.collectionView cellForItemAtIndexPath:indexPath];
self.deletedIndexpath = indexPath.row;
self.deleteButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[self.deleteButton addTarget:self
action:@selector(deleteImage:)
forControlEvents:UIControlEventTouchUpInside];
[self.deleteButton setBackgroundImage: [UIImage imageNamed:@"delete.png"] forState:UIControlStateNormal];
self.deleteButton.frame = CGRectMake(10, 0, 10, 10);
[cell addSubview:self.deleteButton];
}
}
}
问题是,当滚动收集视图时单元被重用时,我也看到该单元中显示的按钮。 如何避免这种情况发生? 收集视图的代码如下:
- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath;
{
Cell *cell = [cv dequeueReusableCellWithReuseIdentifier:kCellID forIndexPath:indexPath];
cell.image.image = [self.imageArray objectAtIndex:indexPath.row];
return cell;
}
过去我做过这样的事情,在添加视图时添加一个标签:
self.deleteButton.frame = CGRectMake(10, 0, 10, 10);
//Mark the view with a tag so we can grab it later
self.deleteButton.tag = DELETE_BUTTON_TAG;
[cell addSubview:self.deleteButton];
然后从任何新的回收单元中将其删除:
- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath;
{
Cell *cell = [cv dequeueReusableCellWithReuseIdentifier:kCellID forIndexPath:indexPath];
//Remove the delete view if it exists
[[cell viewWithTag:DELETE_BUTTON_TAG] removeFromSuperview];
cell.image.image = [self.imageArray objectAtIndex:indexPath.row];
return cell;
}
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