ios - 调用中缺少参数 ‘coder’ 的参数

Question

我已将自定义 UIButton 编码为:

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

我能够使用我的 Storyboard 成功地实例化这个类。现在，我做了一个 UIView 并想在我的 UIView 中添加这个按钮:

var customView:UIView = UIView()
customView.frame = CGRect(x: 0, y: 0, width: 350, height: 250)
.....
let fromDateBtn:UIButton = AccountOpeningButton()//Error comes here as  : Missing Argument for parameter ‘coder’ in call
customView.addSubview(fromDateBtn)

因此，请帮助动态重用此代码。

附言:我提到了http://napora.org/nscoder-and-swift-initialization/ Fatal error: use of unimplemented initializer 'init(coder:)' for class Class does not implement its superclass's required members但是没有成功。

============================================= ========================尝试过

let fromDateBtn:UIButton = UIButton() as! AccountOpeningButton

这会抛出 CastException Could not cast value of type 'UIButton' to '.AccountOpeningButton'

Answer 1

替换这一行

let fromDateBtn:UIButton = AccountOpeningButton()

有了这个:

let fromDateBtn = AccountOpeningButton()

然后在你的类中添加这个方法

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

You can have more than one init method, but you have to obey the inheritance and hierarchy rules. And you need to definitely understand what are called convenience initializers.

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