如何获得任何控制目标c的屏幕触摸位置？

Question

嗨我想获得任何控制的触摸位置/点或任何触摸发生的地方。

为此，我实现了这个，但我没有得到正确的接触点。

   // Create gesture recognizer, notice the selector method
UITapGestureRecognizer *oneFingerTwoTaps =
[[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerTwoTaps)] autorelease];
oneFingerTwoTaps.delegate=self;
// Set required taps and number of touches
[oneFingerTwoTaps setNumberOfTapsRequired:1];
[oneFingerTwoTaps setNumberOfTouchesRequired:1];
[[self view] addGestureRecognizer:oneFingerTwoTaps];

和

 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {

    CGPoint point= [touch locationInView:touch.view];
        NSLog(@"Point - %f, %f",point.x,point.y);
    NSLog(@"Touch");
    return NO; // handle the touch
}

当我试图击中任何UIButton，UIImage，UITableView它没有给我正确的命中点是否有任何我做错的事情？请帮我。谢谢。

Answer 1

您的代码会在其出现的视图中打印触摸的位置。因此，如果您触摸中间的50x100大小的按钮，它将打印“Point 25.0,50.0”。

如果要查找UIScreen的触摸位置，则必须转换值：

 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {

    CGPoint point = [touch locationInView:touch.view];
    CGPoint pointOnScreen = [touch.view convertPoint:point toView:nil];
    NSLog(@"Point - %f, %f", pointOnScreen.x, pointOnScreen.y);
    NSLog(@"Touch");
    return NO; // handle the touch
}

或者只是立即获取窗口（屏幕）空间中的坐标：

 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {

    CGPoint pointOnScreen = [touch locationInView:nil];
    NSLog(@"Point - %f, %f", pointOnScreen.x, pointOnScreen.y);
    NSLog(@"Touch");
    return NO; // handle the touch
}

Answer 2

这是@ DrummerB答案的快速版本。

// add as property
var tapRecognizer: UIGestureRecognizer! 

// add in viewDidLoad() 
tapRecognizer = UIGestureRecognizer()
tapRecognizer.delegate = self // inherit UIGestureRecognizerDelegate
self.view.addGestureRecognizer(tapRecognizer)

// listen for delegate method
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
        let pointOnScreen: CGPoint = touch.location(in: nil)
        print("Point - \(pointOnScreen.x), \(pointOnScreen.y)")
        print("Touch")
        return false
}

//这对我有用xcode 9.2，ios 11.2