ios - CAShapeLayer 更改 lineWidth 导致崩溃

Question

所以我有这个很好的子类，它可能会在某个时候调整大小，然后我调用 updateFrame()将 lineWidth 更改为任何值都会导致崩溃。我需要的是能够在没有动画的情况下更改 lineWidth(立即)。

https://cdn1.imggmi.com/uploads/2019/1/24/a93765689e524d45116f942ce734275e-full.png

https://cdn1.imggmi.com/uploads/2019/1/24/12a880d41cff1f69ef6bd2f974033627-full.png

class OvalLayer: CAShapeLayer {

func updateFrame(_ with: CGRect) {
    let newFrame = with.insetBy(dx: frame.size.width * 0.07, dy: frame.size.height * 0.07)
    path = UIBezierPath(ovalIn: newFrame).cgPath
    lineWidth = (min(frame.size.width, frame.size.height) / 50) //if i remove this line it will be ok
}

init(frame: CGRect) {
    super.init()
    self.frame = frame
    let newFrame = frame.insetBy(dx: frame.size.width * 0.07, dy: frame.size.height * 0.07)
    lineWidth = (min(frame.size.width, frame.size.height) / 50)
    strokeColor = UIColor.white.cgColor
    fillColor = UIColor.clear.cgColor
    path = UIBezierPath(ovalIn: newFrame).cgPath
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

}

Answer 1

是的，一分钟后我写了一个解决方案。我认为当您更新图层属性时，它会从自身重新初始化(只是我的猜测)

override init(layer: Any) {
    super.init(layer: layer)
}