如何解决拉伸UIView的长度,同时用PanGesture拖动手指旋转它
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):
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
}
}
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