ios - UIScrollView 和 touchesBegan/touchesEnded 等

Question

我有一个带有 2 个 subview 的 UIView，我们称它为 View A:

• 一个基本的 UIView，称为 B
• UIScrollView，调用C

我在 View A 中覆盖了以下方法:

• - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
• - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event

当我触摸 View B 时，touchesBegan:withEvent: 和 touchesEnded:withEvent: 被调用，但是如果我触摸 UIScrollView( View C)，这里没有调用。

我知道这是预期的行为，但我想了解原因。我找不到任何明确的答案。有什么想法吗？

Answer 1

使用 TapGestureRecognizer 代替 touchBegan 方法

UITapGestureRecognizer *singleTapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTap:)];
singleTapGestureRecognizer.numberOfTapsRequired = 1;
singleTapGestureRecognizer.enabled = YES;
singleTapGestureRecognizer.cancelsTouchesInView = NO;
[scrollView addGestureRecognizer:singleTapGestureRecognizer];

- (void)singleTap:(UITapGestureRecognizer *)gesture {  
//handle taps   
}

快速版本:

let singleTapGestureRecognizer = UITapGestureRecognizer(target: self, action: "singleTap:")
    singleTapGestureRecognizer.numberOfTapsRequired = 1
    singleTapGestureRecognizer.enabled = true
    singleTapGestureRecognizer.cancelsTouchesInView = false
    scrollViewH.addGestureRecognizer(singleTapGestureRecognizer)

func singleTap(sender: UITapGestureRecognizer) {
    println("handle taps ")

}