Question

在集合视图单元格中，我有三个按钮，没有单击/选择UICollectionViewCell，如何获取单击按钮的索引路径？

到目前为止，这是我的代码：

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];
    UIButton * button = (UIButton *)[cell viewWithTag:10];
    UILabel * labelTitle = (UILabel *)[cell viewWithTag:20];
    UIButton * shareBtn = (UIButton *)[cell viewWithTag:30];
    UIButton * editBtn = (UIButton *)[cell viewWithTag:40];
    [shareBtn addTarget:self action:@selector(shareDoc:) forControlEvents:UIControlEventTouchUpInside];
    [editBtn addTarget:self action:@selector(editDoc) forControlEvents:UIControlEventTouchUpInside];

    return cell;
}

-(void)shareDoc:(UICollectionViewCell *) senderCell
{
    UICollectionView * collectionView = [self.view viewWithTag:22];
    UICollectionViewCell * cCell = [self.view viewWithTag:11];

    NSIndexPath * indexPath = [collectionView indexPathForCell:cCell];
    NSLog(@"cell: %ld", indexPath.row); //But this just returns 0 every time I clicked on a button.
    NSLog(@"section: %ld", indexPath.section);


}

Answer 1

您可以使用indexPathForItemAtPoint:并使用将事件作为参数的操作方法。像这样：

- (IBAction)shareDoc:(id)inSender forEvent:(UIEvent * )inEvent {
    UITouch *theTouch = inEvent.allTouches.anyObject;
    CGPoint thePoint = [theTouch locationInView:self.collectionView];
    IndexPath *theIndexPath = [self.collectionView indexPathForItemAtPoint:thePoint];

    ...
}

您还应该更改按钮的目标操作的分配：

[shareBtn addTarget:self action:@selector(shareDoc:forEvent:) forControlEvents:UIControlEventTouchUpInside];

由于these answers，如果滚动后索引路径错误，则应添加contentOffset：

- (IBAction)shareDoc:(id)inSender forEvent:(UIEvent * )inEvent {
    UITouch *theTouch = inEvent.allTouches.anyObject;
    CGPoint theOffset = self.collectionView.contentOffset
    CGPoint thePoint = [theTouch locationInView:self.collectionView];
    IndexPath *theIndexPath = [self.collectionView indexPathForItemAtPoint:CGPointMake(thePoint.x + theOffset.x, thePoint.y + theOffset.y)];

    ...
}

但这对我来说似乎很奇怪。

Answer 2

您可以尝试此操作，自定义您的单元格或使用标记（无论如何）以确保索引路径，然后使用UIResponder传递您的SEL。例如，

@interface UIResponder (PassAction)

- (void)passAction:(NSString *)actionName otherInfo:(NSDictionary *)otherInfo;

@end

你可以在你的牢房中触发，就像这样：

[self passAction:NSStringFromClass([cell class]) userInfo:@{@"Tag":@(cell.tag)}];

在控制器中，实现如下：

- (void) passAction:(NSString *)eventName otherInfo:(NSDictionary *)userInfo{
    NSLog(@"success");
}

如何在按钮单击时获取并传递UICollectionViewCell

2 个答案: