无法对齐UIView和CAShapeLayer

Question

我无法调整UIView和CAShapeLayer。

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()

即，

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 )