shouldReceiveTouch不叫

Question

我在網上看到很多關於它的問題，特別是在StackOverflow上。 我測試了很多給出的答案，但在我的情況下，沒有任何工作。

我的類實現了協議UIGestureRecognizerDelegate：

@interface CDMapViewController : CDViewController <UIGestureRecognizerDelegate> 

下面的方法是從Xcode的自動完成在@implentation寫我的班級

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

我有正確初始化的UIGestureRecognizer在第一方法，正確請撥打第二，第三和第四種方法：

- (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 */ 
} 

...它不記錄 - 不叫...爲什麼？

Answer 1

您需要撥打super實現touches方法。

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

... and so on. 

這些方法需要對你的看法實施，而不是你的視圖控制器。

選擇你想要的手勢。本身，UIGestureRecognizer並沒有太多，所以選擇一個像UITapGestureRecognizer。接下來，使用指定的初始化器實現您的手勢識別器。

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

最後，執行myMethod:。

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