ios - UIView 框架和边界错误

Question

我有一个 UIView 子类，我正在向其添加一些 CALayers。我已经通过 Storyboard 将此 UIView 添加到我的 View 中。出于某种原因，在 init(和 awakeFromNib)中访问框架和边界总是 (0, 0, 1000, 1000)。这是为什么？

class SliderView: UIView {
    let trackLayer = CAShapeLayer()

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        // The bounds are wrong
        trackLayer.path = UIBezierPath(roundedRect: self.bounds, cornerRadius: 15).cgPath

    }
}

Answer 1

我在 UITableViewCell 中遇到了同样的问题。此解决方法应该有效

override func drawRect(rect: CGRect) {
    super.drawRect(rect)
    customInit()
}

var initialized = false
func customInit(){
    if !initialized{
        initialized = true

    // Bounds will be good. Do your stuff here
    }
}

在你的情况下它应该是这样的:

class SliderView: UIView {
    let trackLayer = CAShapeLayer()

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        // The bounds are wrong
    }

    override func drawRect(rect: CGRect) {
        super.drawRect(rect)
        customInit()
    }

    var initialized = false
    func customInit() {
        if !initialized {
            initialized = true

            // Bounds will be good.
            trackLayer.path = UIBezierPath(roundedRect: self.bounds, cornerRadius: 15).CGPath
        }
    }
}