Question

我的ViewController上有两个UIViews。我将panGesture添加到第一个视图，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。

@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

怎么样

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

CGRectIntersectsRect(::)：返回两个矩形是否相交。

Answer 2

Swift 3 CGRectIntersectsRect替换为intersects

for collider in colliders
        {
            if (collider.frame.intersects(frameTarget)) {
                return
            }
        }

快速检测两个UIView的碰撞

2 个答案: