拉伸UIView的长度，同时用PanGesture拖动手指旋转它

问题描述

我的问题类似于this

我要存档的内容

这是我的版本（外面有透明的UIView，里面的所有内容都设置为UIView约束）：

移动时当前有一个错误，但这不是本文的重点，因此请忽略它。

如我所示，我可以围绕它的锚点（左气泡）旋转，但是我不知道如何在旋转时拉伸它的长度。这是我的轮换代码：

    //Rotate line
    var initialAngle = CGFloat(0)
    var angle = CGFloat(0)
    func pToA (point:CGPoint) -> CGFloat {
            let loc = point
            let c = self.convert(self.center,from:self.superview!)
            return atan2(loc.y - c.y,loc.x - c.x)
        }
    
    @objc func handlePanStretch(recognizer: UIPanGestureRecognizer){
        let touchPoint = recognizer.location(in: self)
        if panStretchRecognizer.state == .began{
            let anchorPoint:CGPoint = CGPoint(x: 0.12,y: 0.5)
            self.layer.anchorPoint = anchorPoint
            originalTappedPoint = recognizer.location(in: self)
            self.initialAngle = pToA(point: touchPoint)

        }
        
        if panStretchRecognizer.state == .changed{
            //rotate
            let ang = pToA(point: touchPoint) - self.initialAngle
            let absoluteAngle = self.angle + ang
            let transform = self.transform.rotated(by: ang)
            self.transform = transform
            self.angle = absoluteAngle
        }
    }

    //Move line
    @objc func handlePanMove(recognizer: UIPanGestureRecognizer){
        let touchPoint = recognizer.location(in: self)
        if panMoveRecognizer.state == .began{
            originalTappedPoint = recognizer.location(in: self)
        }
        if panMoveRecognizer.state == .changed{
            
            differenceX = touchPoint.x - originalTappedPoint.x
            differenceY = touchPoint.y - originalTappedPoint.y
            var newFrame = self.frame
            newFrame.origin.x = self.frame.origin.x + differenceX
            newFrame.origin.y = self.frame.origin.y + differenceY
            self.frame = newFrame
        }
    }

解决方法

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