带有子视图的 UIPinchGestureRecognizer 问题

Question

我有以下代码：

m_singleView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, nWidth - 1, nHeight - 1)];
m_singleView.backgroundColor = [UIColor clearColor];
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
[pinchGesture setCancelsTouchesInView:YES];
[m_singleView addGestureRecognizer:pinchGesture];
[m_singleView setUserInteractionEnabled:YES];
[m_MainView addSubview:m_singleView];

我遇到的问题是捏合事件由于某种原因没有触发。但是，如果我将行从 [m_singleView addGestureRecognizer:pinchGesture] 更改为 [m_MainView addGestureRecognizer:pinchGesture]; 那么一切都会正常工作......我可以不只为子视图添加事件吗？

谢谢！

Answer 1

是的，您可以向子视图添加手势。我像下面这样测试了你的代码工作正常。

首先添加委托。

@interface ViewController : UIViewController<UIGestureRecognizerDelegate>

- (void)viewDidLoad {
    [super viewDidLoad];
   
   UIView *m_singleView = [[UIView alloc] initWithFrame:CGRectMake(50, 50, self.view.frame.size.width - 50, self.view.frame.size.height - 50)];
    self.view.backgroundColor=[UIColor greenColor];
    m_singleView.backgroundColor = [UIColor redColor];
    UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch)];
    pinchGesture.delegate=self;
    [pinchGesture setCancelsTouchesInView:YES];
    [m_singleView addGestureRecognizer:pinchGesture];
    [m_singleView setUserInteractionEnabled:YES];
    [self.view addSubview:m_singleView];
}

-(void)pinch{
    NSLog(@"In PInch");
}

你已经使用了捏合手势，所以你可以像下面这样使用它。

Answer 2

使用Debug view hierarchy查看m_singleView的大小是否为0？如果是这样，需要更改m_singleView的大小，直到您可以触摸它。

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