ios - UITapGestureRecognizer 吞下所有手势

Question

我正在尝试将 UITapGestureRecognizer 添加到我的应用程序中，以便我可以检测所有两根手指的点击并采取行动，但传递任何其他用户输入。听起来微不足道，但我无法让它发挥作用。到目前为止，这是我的代码，在我的主视图 Controller 中:

- (void) viewDidLoad {
  // other init stuff
  UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
  [tapRecognizer setNumberOfTouchesRequired:2];
  [tapRecognizer setNumberOfTapsRequired:1];
  [tapRecognizer setCancelsTouchesInView:NO];

  UIView *tapHolderView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
  [tapHolderView setMultipleTouchEnabled:YES];
  [tapHolderView addGestureRecognizer:tapRecognizer];

  [self.view addSubview:tapHolderView];

  [tapRecognizer release];
}

- (void) handleTap:(UITapGestureRecognizer *) sender {
  if (sender.state == UIGestureRecognizerStateEnded) {
    // do something
  }
}

发生的事情是这样的:用两根手指点击会触发 handleTap 方法。任何其他用户输入，无论是滑动、捏合、单指点击等，都不会被任何其他 View (UIToolbar、UIWebView 等)接收。

如果您对此有任何见解，我将不胜感激，如果我对问题的描述不够具体，请告诉我。

Answer 1

尝试将 View Controller 设置为 UIGestureRecognizerDelegate 的委托(delegate)，并实现 gestureRecognizer:shouldRecognizeSimulaneouslyWithGestureRecgonizer 以始终返回“YES”。示例:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}