ios - 设置 UIView 中加载的 Xib 中的值

Question

我正在尝试加载已加载到 UIView 中的 Xib，并将值设置为 UIView 内的元素。但是，我不断收到 fatal error :在展开可选值时意外发现 nil

我的客户 View

 class WalkThroughView: UIView {

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
override func drawRect(rect: CGRect) {
    // Drawing code
}
*/
@IBOutlet weak var walthroughHeader: UILabel!
@IBOutlet weak var walkThroughInfo: UILabel!

override func awakeFromNib() {
    //
}

func setLabelInfo(header: String, below: String) {
    walthroughHeader.text = header
    walkThroughInfo.text = below

    walthroughHeader.textColor = UIColor.blackColor()
    walkThroughInfo.textColor = UIColor.blackColor()

    walthroughHeader.font = UIFont(name: "BrandonGrotesque-Bold", size: 30)
    walkThroughInfo.font = UIFont(name: "BrandonGrotesque-Light", size: 20)

    walthroughHeader.textAlignment = .Center
    walkThroughInfo.textAlignment = .Center
}

@IBAction func makeMe(sender: AnyObject) {
}

}

初始化

let firstView = WalkThroughView()
firstView.setLabelInfo("HEADER VIEW", below: "Lorem ipsolum, Lorem ipsolum, Lorem ipsolum, Lorem ipsolum, Lorem ipsolum, Lorem ipsolum.")

这里没有可选值，所以为什么会出现错误 fatal error :在解包可选值时意外发现 nil

Answer 1

View 将从 viewDidLoad 方法中的 xib 加载。在那之前一切都将为零，这给了你这个错误你必须首先将 xib 作为 subview 添加到某个东西。

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