快速检测两个UIView的碰撞 [英] Detect collision of two UIView's in swift

问题描述

我的ViewController上有两个UIViews。我将panGesture添加到第一个视图中，当我开始移动此视图时，第二个视图将移向第一个视图。我希望在这两个视图发生碰撞时检测到一个事件。这是我的代码。

I have two UIViews on my ViewController. I added panGesture to first view and when i start moving this view the second view will move towards first view. I want to detect an event when these two views collides. Here is my code.

@IBAction func dragFirstView(sender: UIPanGestureRecognizer) {

        let translation = sender.translationInView(self.view)

        dispatch_async(dispatch_get_main_queue()) { () -> Void in
            UIView.animateWithDuration(2.5, delay: 0.0, options: UIViewAnimationOptions.CurveEaseOut, animations: {
                self.secondView.frame = CGRectMake(sender.view!.center.x + translation.x, sender.view!.center.y + translation.y, self.secondView.frame.size.width, self.secondView.frame.size.height)
                }, completion: nil)
        }

        sender.view!.center = CGPoint(x: sender.view!.center.x + translation.x, y: sender.view!.center.y + translation.y)
        sender.setTranslation(CGPointZero, inView: self.view)
    }

推荐答案

怎么样

if (CGRectIntersectsRect(secondView.frame, sender.frame)) {
        // Do something
    }

CGRectIntersectsRect（： :) ：返回两个矩形是否相交。

CGRectIntersectsRect(::) : Returns whether two rectangles intersect.

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