將UIView子類鏈接到xib文件

Question

我創建了一個UIView子類，我想將其鏈接到xib文件。 我添加了一個xib文件，並將該類設置為DraggableView，但是例如當我創建一個標簽並將其鏈接到information 。 它返回的information等於零？ 為什么不起作用？

class DraggableView: UIView {
    var delegate: DraggableViewDelegate!
    @IBOutlet var information: UILabel!


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

    override init(frame: CGRect) {
        super.init(frame: frame)

        information.text = "no info given"
        information.textAlignment = NSTextAlignment.Center
        information.textColor = UIColor.blackColor()

        self.backgroundColor = UIColor.whiteColor()



    }
}

Answer 1

請確保像這樣在自定義UIView中從XIB方法添加init：

class func instanceFromNib() -> UIView {
        return UINib(nibName: "nib file name", bundle: nil).instantiateWithOwner(nil, options: nil)[0] as UIView
    }

然后您可以像這樣使用它：

var view = DraggableView.instanceFromNib()
view.information.text = "Test Label"
self.view.addSubview(view)

Answer 2

在設置對象值之前，您需要自定義UIView首先加載XIB文件。

 class DraggableView: UIView {

     var delegate: DraggableViewDelegate!
     @IBOutlet var information: UILabel!

    init() { xibSetup() }

    override init(frame: CGRect) {
        super.init(frame: frame)
        xibSetup()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        if self.subviews.count == 0 {
            xibSetup()
        }
    }


    func xibSetup() {
        let view = loadViewFromNib()
        view.frame = bounds
        view.autoresizingMask = [UIViewAutoresizing.FlexibleWidth, UIViewAutoresizing.FlexibleHeight]
        addSubview(view)


        // INIT THERE YOUR LABEL
        information.text = "no info given"
        information.textAlignment = NSTextAlignment.Center
        information.textColor = UIColor.blackColor()

       self.backgroundColor = UIColor.whiteColor()
    }

    func loadViewFromNib() -> UIView {
        let bundle = NSBundle(forClass: self.dynamicType)
        let nib = UINib(nibName: "nib file name", bundle: bundle)

        let view = nib.instantiateWithOwner(self, options: nil)[0] as! UIView

        return view
    }

然后簡單地這樣調用：

var view = DraggableView()