无法对齐UIView和CAShapeLayer

我在调整UIView和CAShapeLayer遇到了麻烦。

以下是演示此问题的示例代码：

 import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() let square = UIView(frame: CGRect(x: 100, y: 100, width: 100, height: 100)) square.transform = CGAffineTransformMakeRotation(CGFloat(20*M_PI/180)) square.backgroundColor = UIColor.grayColor() view.addSubview(square) let strokeLayer = CAShapeLayer() strokeLayer.path = UIBezierPath(rect: square.bounds).CGPath strokeLayer.position = square.center strokeLayer.setAffineTransform(square.transform) strokeLayer.fillColor = UIColor.clearColor().CGColor strokeLayer.strokeColor = UIColor.redColor().CGColor strokeLayer.lineWidth = 1 view.addSubview(square) view.layer.addSublayer(strokeLayer) } } 

这是结果的图像：

如何让两者对齐？

Answer 1

您需要做的唯一更改是添加：

 strokeLayer.frame = square.layer.bounds 

紧接着：

 let strokeLayer = CAShapeLayer() 

也就是说，

 let strokeLayer = CAShapeLayer() strokeLayer.frame = square.layer.bounds strokeLayer.path = UIBezierPath(rect: square.bounds).CGPath strokeLayer.position = square.center strokeLayer.setAffineTransform(square.transform) strokeLayer.fillColor = UIColor.clearColor().CGColor strokeLayer.strokeColor = UIColor.redColor().CGColor strokeLayer.lineWidth = 1 

Answer 2

如果将形状图层定位在（0,0），该怎么办？

 strokeLayer.position = CGPointMake( 0, 0 )