ios - 约束和SubLayers(CALayer)未更新

我已经在superView中创建了左边框

...
    var leftLayer: CALayer?
    override public func awakeFromNib() {
        super.awakeFromNib()
        self.leftLayer = CALayer()
        self.leftLayer?.borderColor = UIColor.red.cgColor
        self.leftLayer?.borderWidth = 1
        self.layer.addSublayer(self.leftLayer!)
...

然后在layoutSubviews中，我尝试根据约束更新边框:

...
override public func layoutSubviews() {
        super.layoutSublayers(of: layer)
        leftLayer!.frame = CGRect(x: 0,
                                  y: 0,
                                  width: 1,
                                  height: self.frame.size.height)

}
...

但是sub CALayers没有遵循CALayer / UIViews的最高约束。我见过this，但是无法将图层添加到 super 视图。

您知道如何让子CALayer遵循包含UIView的约束吗？

最佳答案

覆盖视图的frame属性以调整其子图层的frame:

override var frame: CGRect {
    didSet{
        leftLayer!.frame = CGRect(x: 0,
                                  y: 0,
                                  width: 1,
                                  height: self.frame.size.height)
    }
}

关于ios - 约束和SubLayers(CALayer)未更新，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45750882/