ios - 获取原始多点触控x，y位置

Question

我正在移植具有内置专有手势系统的windows touch应用程序，并且其中一个要求是我必须使用它。这个手势系统需要一系列x，y点（每个触摸点一个点），并从这些原始点推断手势。

我从来没有在iOS上做过这件事，并想知道最好的（唯一的）方法是做什么。

Answer 1

你需要使用倒是开始：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { 

    UITouch *touch = [[event allTouches] anyObject]; 
    CGPoint touchLocation = [touch locationInView:self]; 

    touchLocation.x; // x coord 
    touchLocation.y; // y coord 
} 

Answer 2

在SWIFT：

确保您的视图控制器实现UIGestureRecognizerDelegate：

class MyViewController: UIViewController, UIGestureRecognizerDelegate{...} 

的视图控制器内覆盖以下内容：

override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) { 
    super.touchesBegan(touches, withEvent: event) 
    if let touch: UITouch = touches.first as? UITouch{ 
     let touchLocation = touch.locationInView(self.view) as CGPoint 
     touchLocation.x 
     touchLocation.y 
    } 
} 
override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) { 
    //When gesture ends 
} 
override func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) { 
    if let touch: UITouch = touches.first as? UITouch{ 
     let touchLocation = touch.locationInView(self.view) as CGPoint 
     touchLocation.x 
     touchLocation.y 
    } 
}