目標C：在泛值觸發方法

Question

根據Pan gesture值觸發method的最佳方法是什麼？

當我的pan location x介於500到600之間時，我想觸發method。人們通常如何處理？

Answer 1

您需要重寫gestureRecognizerShouldBegin。然後，您可以檢測到translation.x並查看值之間的位置。

- (BOOL)gestureRecognizerShouldBegin:(UIPanGestureRecognizer *)panGestureRecognizer { 
    CGPoint translation = [panGestureRecognizer translationInView:self.view]; 
    if (translation.x > 500 && translation.x < 600) 
     [self callCustom]; 
    return true; 
} 

- (void) callCustom { 
//do what you need to do 
} 

Answer 2

我假設你有一個處理平移手勢的方法。使該方法看起來像這樣。

- (void)handlePan:(UIPanGestureRecognizer *)recognizer { 

    if (recognizer.state == UIGestureRecognizerStateChanged) { 

     CGPoint movement = [recognizer translationInView:self.view]; 

     if (movement.x >= 500 && movement.x <= 600) { 

      [self methodToCall]; 
     } 
    } 
}