ios - 快速检测两个 UIView 的碰撞

Question

我的 ViewController 上有两个 UIView。我将 panGesture 添加到第一个 View ，当我开始移动此 View 时，第二个 View 将移向第一个 View 。当这两个 View 发生冲突时，我想检测一个事件。这是我的代码。

@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)
    }

Answer 1

关于

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

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