Swift 3 - 从另一个 Class 中的 XIB 实例访问变量

Question

几天来我一直在努力解决这个问题，但运气不佳:(

我想要做的是在另一个 ViewController 中已经存在的 XIB（称为 BottomNav）实例中设置变量，称为 "curX"。我最接近以下：

class Util: NSObject {
    class func loadNib() {
        let nib: BottomNav = Bundle.main.loadNibNamed("BottomNav", owner: self, options: nil)!.first as! BottomNav
        nib.curX = 10
    }
}

这是 BottomNav Class:

class BottomNav: UIView {
    @IBOutlet var view: UIView!
    @IBOutlet weak var homeBtn: UIView!
    @IBOutlet weak var scroller: UIScrollView!
    @IBOutlet weak var scrollerContent: UIView!

    var curX = 32

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

        Bundle.main.loadNibNamed("BottomNav", owner: self, options: nil)
        self.addSubview(self.view)
    }

}

这通过了编译器，没有任何警告，但是当它是运行时，我得到一个 "this class is not key value coding-compliant for the key" 错误。这通常在有一个不再存在的出口时出现，但绝对不是这种情况，我已经使用应用程序上已有的多个 XIB 对其进行了测试，并且首先通过故事板加载没有问题。我只在 "loadNibNamed".

时收到此错误

我走的路对吗？我的想法是，也许我的 Util class 无法访问 Bundle 或其他东西？

Answer 1

Swift 3.0

我认为您可以从中得到解决方案。祝一切顺利

    var view: UIView!

    override init(frame: CGRect) {

        // call super.init(frame:)
        super.init(frame: frame)

        // 3. Setup view from .xib file
        xibSetup()
    }

    required init?(coder aDecoder: NSCoder) {

        // call super.init(coder:)
        super.init(coder: aDecoder)

        // 3. Setup view from .xib file
        xibSetup()
    }

    // MARK: - UI setup
    func xibSetup() {

        let nib = UINib(nibName: "BottomNav", bundle: nil)
        view = nib.instantiate(withOwner: self, options: nil)[0] as! UIView

        // use bounds not frame or it'll be offset
        view.frame = bounds

        // Make the view stretch with containing view
        view.autoresizingMask = [UIViewAutoresizing.flexibleWidth, UIViewAutoresizing.flexibleHeight]

        addSubview(view)
    }

Answer 2

class BottomNav: UIView {
    @IBOutlet var view: UIView!
    @IBOutlet weak var homeBtn: UIView!
    @IBOutlet weak var scroller: UIScrollView!
    @IBOutlet weak var scrollerContent: UIView!

    var curX = 32

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

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

    func commonInit(){

        Bundle.main.loadNibNamed("BottomNav", owner: self, options: nil)
        guard let content = view else { return }
        content.frame = self.bounds
        content.autoresizingMask = [.flexibleHeight, .flexibleWidth]
        self.addSubview(content)
    }

}

并且在调用实例时，尝试以下操作。

        let instance = BottomNav()
        instance.curX = 30

Swift 3 - 从另一个 Class 中的 XIB 实例访问变量

Swift 3 - Access Variable From Instance Of XIB In Another Class

xib

ios

swift