Question

我一直试图在用户点击集合视图的单元格时添加一个复选标记，如果再次点击它 - 将其删除。

到目前为止，我已经编写了一个添加复选标记的代码，但我仍然找不到删除它的方法。

我的代码：

 - (void)profilePicked:(UIGestureRecognizer*)gesture {

UIView *pickedView = (UIView* )[gesture view];
UIImageView *tick = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"ticker"]];
tick.frame = CGRectMake(0, 0, 110, 110);
tick.tag = 105;
tick.contentMode = UIViewContentModeScaleAspectFit;

if(![pickedView.subviews containsObject:tick]) {
    [pickedView addSubview:tick];
} else {
    for (UIView *subview in pickedView.subviews) {
        if (subview.tag == 105) {
            [subview removeFromSuperview];
        }
    }        [self.profilesCollection reloadData];
}

}

和：

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

static NSString *cellIdentifier = @"profileCell";
InviterCollectionViewCell *cell = (InviterCollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];

// some stuff happening here

UIView *circle = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 110, 110)];
//cell.profilePicture.frame = CGRectMake(0, 0, 110, 110);
//cell.profilePicture.contentMode = UIViewContentModeScaleAspectFill;
[circle addSubview:imageView];

// Round the edges of the profile picture
circle.layer.cornerRadius = 55;
circle.clipsToBounds = YES;
[cell.contentView addSubview:circle];

cell.ticker.hidden = YES;

//Add Gesture Recognizer for the profile Picture
UITapGestureRecognizer *tapped = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(profilePicked:)];
tapped.numberOfTapsRequired = 1;
[circle addGestureRecognizer:tapped];
circle.userInteractionEnabled = YES;

return cell;

 }

我尝试在didSelectItemAtIndexPath和didDeselectItemAtIndexPath中实现一些功能，但它没有按预期工作。

非常感谢任何帮助。

Answer 1

试试这个解决方案：
1 将带有复选标记图像的UIImageView添加到storyboard或nib文件中的单元格，然后为此imageView创建插座并将其设置为隐藏模式
2 在didSelectItemIndexPath方法中添加以下代码：

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    MyCollectionViewCell *cell = (MyCollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath];
     //check if the the checkmark image is hidden then change it to visible
    if(cell.checkMarkImage.hidden) 
       cell.checkMarkImage.hidden = NO;
    else
       cell.checkMarkImage.hidden = YES;

    [cell setSelected:YES];
}

添加复选标记即可点击集合视图的单元格

1 个答案: