ios - 如何将 Storyboard UIView 设置为 View 的子类？

Question

我添加了 UIView 的子类:

class WhiteWithGreyTBBorderView: UIView {
    override init (frame : CGRect) {
        super.init(frame : frame)
        addBehavior()
    }

    convenience init () {
        self.init(frame:CGRectZero)
    }

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    func addBehavior (){
        backgroundColor = UIColor.blackColor()
        addTopBorderWithColor(UIColor.blackColor(), width: 5)
    }
}

然后我有一个 ViewExtension:

extension UIView {
    func addTopBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.CGColor
        border.frame = CGRectMake(0, 0, self.frame.size.width, width)
        self.layer.addSublayer(border)
    }

    func addRightBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.CGColor
        border.frame = CGRectMake(self.frame.size.width - width, 0, width, self.frame.size.height)
        self.layer.addSublayer(border)
    }

    func addBottomBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.CGColor
        border.frame = CGRectMake(0, self.frame.size.height - width, self.frame.size.width, width)
        self.layer.addSublayer(border)
    }

    func addLeftBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.CGColor
        border.frame = CGRectMake(0, 0, width, self.frame.size.height)
        self.layer.addSublayer(border)
    }
}

我在 Storyboard中添加了一个 UIView，并将类设置为 WhiteWithGreyTBBorderView。它仍然是白色而不是黑色，在我得到的控制台中:

2015-09-03 14:28:38.802 NewsApp[6801:1954504] Failed to set (borderColor) user defined inspected property on (NewsApp.WhiteWithGreyTBBorderView): [ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key borderColor. 2015-09-03 14:28:38.803 NewsApp[6801:1954504] Failed to set (borderWidth) user defined inspected property on (NewsApp.WhiteWithGreyTBBorderView): [ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key borderWidth.

知道哪里出了问题吗？

Answer 1

当您使用 Storyboard 时， View 是通过调用 init(coder aDecoder: NSCoder) 创建的。您需要做的就是在所有初始化方法中调用 addBehavior :)
这样您就可以确保在所有情况下都正确配置了您的 View (当您从代码和 Storyboard创建它时)。就是这样

你可以设置一个断点，当你从 Storyboard 或 xib 实例化一个 View 时，你会看到 init (frame : CGRect) 没有被调用。
:)

convenience init () {
    self.init(frame:CGRectZero)
    addBehavior()
}

required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    addBehavior()
}