iphone - UIScrollView 和检测点击手势的 subview

Question

我已将 TapGestureRecognizer 添加到我的 self.view 中:

    tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTap:)];
    tap.numberOfTapsRequired = 1;
    tap.numberOfTouchesRequired = 1;
    [self.view addGestureRecognizer:tap];
    [tap release];

该 View 包含一个带有图像和标签的 UIScrollView。我想检测用户是否点击标签。

- (void)singleTap:(UIGestureRecognizer*)gestureRecognizer {

    CGPoint pt = [gestureRecognizer locationInView:self.view];

    UIView *v = [self.view hitTest:pt withEvent:nil];
    if ([v isKindOfClass:[UILabel class]]) {
        NSLog(@"label!");
        return;
    }   
    // else do other stuff if its not a label

但是我没有看到标签!在我的日志中。

Answer 1

我认为这是因为 userInteractionEnabled 在 UILabel 上默认为 NO。尝试将其打开。

编辑:这确实是一个猜测，但只是为了确认，Apple 文档上的 [UIView hitTest:withEvent:] 状态:

This method ignores view objects that are hidden, that have disabled user interaction, or have an alpha level less than 0.01.