檢測UILongPressGestureRecognizer方向不能比擬的初始點

if (gesture.state == UIGestureRecognizerStateBegan) { 
    _initial = [gesture locationInView:self.view]; 
}else if (gesture.state == UIGestureRecognizerStateChanged){ 
    CGPoint p = [gesture locationInView:self.view]; 
    double dy = p.y - _initial.y; 
    if (dy > 0) { 
     NSLog(@"Finger moved to the up"); 
    } 
    else { 
     NSLog(@"Finger moved to the down"); 
    } 
}

這是我的方法來檢測UILongPressGestureRecognizer方向，但我想檢測方向不是比較初始點，但比較stateChanged點。檢測UILongPressGestureRecognizer方向不能比擬的初始點

這很難描述，例如：表格0至7已啓動，但7至-5降低，然後-5至-2升高。

來源

2016-12-08 Roy Wang

您應該使用translationInView。

CGPoint translation = [gesture translationInView:view.superview]; 

if (translation.y>0) { 
// moving up 
} else { 
// moving down 
}

來源

2016-12-08 03:37:16 GeneCode

UILongPressGestureRecognizer沒有translationInView方法 –

您的文章說，「UIPanGestureRecognizer」。現在你說longpress。也沒有這種東西longpressrecognizer，也可以檢測平移。他們都是兩個不同的東西。 – GeneCode

我的一個朋友給我一些建議，而且運作良好：

CGPoint point = [gestureRecognizer locationInView:self.view]; 

if(gestureRecognizer.state == UIGestureRecognizerStateBegan){ 
    _lastY = point.y; 
}else if(gestureRecognizer.state == UIGestureRecognizerStateChanged) { 
    double y = point.y - _lastY; 

    if (y < 0.f) { 
     NSLog(@"****up*****"); 

    }else{ 
     NSLog(@"****down*****"); 
    } 

    _lastY = point.y; 
}

我知道這不是一個很好的，但它的工作原理，任何想法？

來源

2016-12-08 07:20:18

斯威夫特3

下面是一個完整的功能，以確定UILongPressGestureRecognizer的向左或向右移動：

@objc func swipePress (_ sender: UILongPressGestureRecognizer) { 

     let location = sender.location(in: self.view) 
     print ("Location : \(location.x)") 

     if sender.state == .ended { 
      print("swipe ended") 
      buttonCreated = false 

      animateRemoveArrows() 
      if gestureDirection == "right" { 
       print("going forward") 
       if myWebView.canGoForward { 
       myWebView.goForward() //go forward 
       } else { 

       } 
      } else if gestureDirection == "left" { 
       print("going backward") 
       if myWebView.canGoBack { 
       myWebView.goBack() //go back 
       } else { 

       } 

      } else { 

      } 


     } else if sender.state == .began { 
      gestureDirection = "" // reset direction 
      print("swipe started") 
      firstPoisitionX = location.x 
      firstPoisitionY = location.y 

      print ("Last x: \(firstPoisitionX)") 

     } else if sender.state == .changed { 

      if location.y > (firstPoisitionY + 100) { 
       print("going up or down") 

      } else if location.y < (firstPoisitionY - 100) { 
       print("going up or down") 

      } else if location.x > (firstPoisitionX + 50) { 
       print("going right") 
       if buttonCreated == false { // only create one button 
        showArrow(direction: "right") 
        print(rightArrow.center) 
        gestureDirection = "right" 
        buttonCreated = true 
       } 
      } else if location.x < (firstPoisitionX - 50) { 
       print("going left") 
       if buttonCreated == false { // only create one button 
        showArrow(direction: "left") 
        print(leftArrow.center) 

        gestureDirection = "left" 
        buttonCreated = true 
       } 
      } 
     } 
    }

來源

2017-09-07 17:42:12 SwiftLanding

檢測UILongPressGestureRecognizer方向不能比擬的初始點

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