ios - 当 View 从纵向更改为横向时，调整带有透明孔的层的位置

Question

我正在使用这段代码创建一个带有透明孔的图层

let radius = min(self.view.frame.size.width,self.view.frame.size.height)
    print(radius)
    let path = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.view.frame.size.height), cornerRadius: 0)
    let circlePath = UIBezierPath(roundedRect: CGRect(x: 0, y: self.view.frame.size.height/2 - radius/2 , width: radius, height: radius), cornerRadius: radius/2)
    path.append(circlePath)

    path.usesEvenOddFillRule = true

    fillLayer.path = path.cgPath
    fillLayer.fillRule = kCAFillRuleEvenOdd
    fillLayer.fillColor = UIColor.black.cgColor
    fillLayer.opacity = 0.5
    view.layer.addSublayer(fillLayer)

如果初始 View 是图像中显示的纵向或横向，它工作正常

但是，如果 View 从纵向变为横向或从横向变为纵向

如图所示，层的方向不正确

Answer 1

看起来您需要在用户旋转设备时更新路径框架。您正在寻找类似于 here 的答案.

如果您需要随着过渡设置动画，请尝试这样的操作:

override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
    super.viewWillTransition(to: size, with: coordinator)
    coordinator.animate(alongsideTransition: { context in            
        // update frames here
    }, completion: nil)
}