ios - shouldReceiveTouch 未调用

Question

我在网上看到很多关于它的问题，尤其是在 StackOverflow 上。我测试了许多给定的答案，但就我而言，没有任何效果。

我的类实现协议(protocol)UIGestureRecognizerDelegate:

@interface CDMapViewController : CDViewController <UIGestureRecognizerDelegate>

下面的方法是我类的@implentation中的xcode自动补全写的

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer 
shouldReceiveTouch:(UITouch *)touch {
    NSLog(@"not called");
    return NO;
}

我已经在正确调用第二、第三和第四方法的第一个方法中正确初始化了 UIGestureRecognizer:

- (void)initGestureOnMap {
    UIGestureRecognizer *gestureRecognizer = [[UIGestureRecognizer alloc] init];
    gestureRecognizer.delegate = self;
    [self.view addGestureRecognizer:gestureRecognizer];
}

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event  {
    [super touchesBegan:touches withEvent:event];
    gesture_dragging = NO;
}

- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesMoved:touches withEvent:event];
    gesture_dragging = YES;
}

- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesEnded:touches withEvent:event];
    if (gesture_dragging || [touches count] != 1) return;
        /* bla bla bla */
}

...它不记录 – 不调用...为什么？

Answer 1

您需要为 touches 方法调用 super 实现。

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event  {
    [super touchesBegan:touches withEvent:event];
    gesture_dragging = NO;
}

... and so on.

这些方法需要在您的 View 上实现，而不是在您的 View Controller 上实现。

选择您想要的手势类型。就其本身而言，UIGestureRecognizer 并没有做太多事情，所以选择像 UITapGestureRecognizer 这样的一个。接下来，使用指定的初始化程序实现您的手势识别器。

UITapGestureRecognizer *gestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(myMethod:)];

最后，实现myMethod:。

-(void)myMethod:(UITapGestureRecognizer *)recognizer
{
    // Whatever this does.
}