添加viewDidLoad时，IBAction不会激发

Question

我有几个IBActions附加到UIButtons。IBActions运行良好，直到我添加以下代码：

- (void)viewDidLoad {
    [super viewDidLoad];
    NSLog(@"View Did Load");
    [self addGestureRecognizersToView:drawImage];
}

在我添加了那块代码之后，IBActions不会启动。当我触摸UIButtons时，它们会高亮显示，但没有一个IBAction代码被击中。

这是我的addGestureRecognizers代码：

- (void)addGestureRecognizersToView:(UIImageView *)theView {
    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
    [panGesture setMaximumNumberOfTouches:2];
    [panGesture setMinimumNumberOfTouches:1];
    //panGesture.delegate = drawImage;
    [theView addGestureRecognizer:panGesture];
    [panGesture release];
    UITapGestureRecognizer *doubleFingerTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
    [doubleFingerTap setNumberOfTapsRequired:2];
    [self.view addGestureRecognizer:doubleFingerTap];
    [doubleFingerTap release];
    UITapGestureRecognizer *singleFingerTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
    [singleFingerTap setNumberOfTapsRequired:1];
    [self.view addGestureRecognizer:singleFingerTap];
    [singleFingerTap release];
}

如果我注释掉singleFingerTap代码，它就会工作。我想我不应该使用alloc，因为我以前已经在doubleFingerTap中分配过一次了？

你知道我在这里可能遗漏了什么吗？

Answer 1

单手指敲击会妨碍按钮的正常行为。你必须确保触球不受阻碍。

[singleFingerTap setCancelsTouchesInView:NO];

Answer 2

听起来UIMapGestureRecognizer正在拦截原本由UIButtons处理的抽头。

您可以使用gestureRecognizer:shouldReceiveTouch::

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    return (touch.view != self.button1 && 
            touch.view != self.button2);
}

或者，你可以破解响应链。