旋转和捏（缩放）手势混淆父 UIView 和他的子视图框架答案

【问题标题】：Rotation & Pinch(scale) gesture messes parent UIView and his subviews frame旋转和捏（缩放）手势混淆父 UIView 和他的子视图框架
【发布时间】：2016-02-24 17:55:13
【问题描述】：

我正在尝试在包含多个子视图（UIButton、UITextView）的 UIView 上实现捏合和旋转手势。 为方便起见，在下面整理了代码

我猜我错过了什么。不知道是什么。谢谢！

结果：

代码

规模：

 var scaleAnchorPoint = CGPoint()

    func handleSizeIncreasing(sender:UIPinchGestureRecognizer) {
        if sender.state == UIGestureRecognizerState.Began
        {
            print("Began")
            scaleAnchorPoint = self.center
        }

        else if sender.state == UIGestureRecognizerState.Changed
        {
            txtView.transform = CGAffineTransformScale(txtView.transform, sender.scale, sender.scale)
            sender.scale = 1.0
            self.frame.size = CGSizeMake(txtView.frame.width + buttonSize, txtView.frame.height + buttonSize)
            self.center = scaleAnchorPoint
            updateViews(scaleAnchorPoint)
            print("Changed")
        }

    }

旋转：

var rotateAnchorPoint = CGPoint()

func handleRotate(sender : UIRotationGestureRecognizer) {

    if sender.state == UIGestureRecognizerState.Began
    {
        print("Began")
        rotateAnchorPoint = self.center
    }

    else if sender.state == UIGestureRecognizerState.Changed
    {
        sender.view!.transform = CGAffineTransformRotate(sender.view!.transform, sender.rotation)
        sender.rotation = 0
        updateViews(rotateAnchorPoint)
        print("Changed")
    }



}

侧面：

 func updateViews(aroundPoint : CGPoint  )
    {
        self.center = aroundPoint
        txtView.frame.origin = CGPointMake(buttonSize / 2, buttonSize / 2)
        txtView.contentSize = txtView.frame.size
    }
    func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }

【问题讨论】：

标签： objective-c swift uiview uigesturerecognizer scale

【解决方案1】：

想通了。简单地说，当比例/框架发生变化时，而不是像我在这里那样访问Frame：self.frame.size = CGSizeMake(txtView.frame.width + buttonSize, txtView.frame.height + buttonSize)

访问 self.bounds ，像这样 -

 self.bounds.size = CGSizeMake(txtView.frame.width + buttonSize, txtView.frame.height + buttonSize)

享受吧！

【讨论】：