ios - 不能继承 WKWebView

Question

我正在尝试子类化 WKWebView。当我实现自己的初始化器时，出现了这个错误:

'required' initializer 'init(coder:)' must be provided by subclass of 'WKWebView'

好的，众所周知，我们必须为 UIView 的子类实现它。对于 UIView 的直接子类，它只需实现它就可以工作，但是对于 WKWebView 它似乎并不那么简单。我遵循了 Fix-it 提示，并将此片段添加到代码中:

required @availability(*, unavailable) convenience init!(coder: NSCoder!) {
        fatalError("init(coder:) has not been implemented")
    }

所以我得到了如下类:

import WebKit


class TSWebView : WKWebView {

    let s: String
    let i: Int

    init(s: String, i: Int) {
        self.s = s
        self.i = i
        super.init(frame: CGRectZero, configuration: WKWebViewConfiguration())
    }

    required @availability(*, unavailable) convenience init!(coder: NSCoder!) {
        fatalError("init(coder:) has not been implemented")
    }
}

但是，当我这样做时，我会遇到另外四个错误:

expected declaration
    required @availability(*, unavailable) convenience init!(coder: NSCoder!) {

consecutive declarations on a line must be separated by ';'
    required @availability(*, unavailable) convenience init!(coder: NSCoder!) {

cannot override 'init' which has been marked unavailable
    required @availability(*, unavailable) convenience init!(coder: NSCoder!) {

'required' modifier must be present on all overrides of a required initializer
    required @availability(*, unavailable) convenience init!(coder: NSCoder!) {

有什么想法吗？我的 Xcode 版本是 6.1.1 (6A2008a)。非常感谢。

Answer 1

像这样重写常规初始化。这对我有用，Swift 5。

override init(frame: CGRect, configuration: WKWebViewConfiguration) {
    super.init(frame: frame, configuration: configuration)
}

required init?(coder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}