如何在 Swift 中将 CALayer 定位在 UIView 的中心？

Question

我有这个 CALayer，它是一个我希望正好位于 UIView 中心的点。我有一个覆盖 2/3 屏幕的 UIView。我如何让点位于 UIView 的中间。下面的代码将点定位在我需要的位置上方一英寸处。这是我的代码：

func setupUI() {

    let lineShape1 = CAShapeLayer()

    let linePath1 = UIBezierPath.init(ovalIn: CGRect.init(x: 0, y: 0, width: 5, height: 5))
    lineShape1.path = linePath1.cgPath
    lineShape1.fillColor = UIColor.init(white: 0.7, alpha: 0.5).cgColor
    lineShape1.position = CGPoint(x: cameraView.frame.size.width / 2, y: cameraView.frame.size.height / 2)
    self.view.layer.addSublayer(lineShape1)

}

Answer 1

您混淆了框架和边界。设置成这样

func setupUI() {

    let lineShape1 = CAShapeLayer()

    let linePath1 = UIBezierPath.init(ovalIn: CGRect.init(x: 0, y: 0, width: 5, height: 5))
    lineShape1.path = linePath1.cgPath
    lineShape1.fillColor = UIColor.init(white: 0.7, alpha: 0.5).cgColor
    lineShape1.position = CGPoint(x: view.bounds.midX, y: view.bounds.midY)
    
   view.layer.addSublayer(lineShape1)

}