swift - NSWindowController 指定初始化器之谜

Question

我正在努力使这段代码工作:

class MyWindowController: NSWindowController
{
  let thing: Thing

  convenience init(thing: Thing)
  {
    self.thing = thing

    super.init(windowNibName: NSNib.Name(rawValue: "MyNib"))
  }
}

当然，问题在于便利初始化程序无法从父类(super class)调用 init。那么如何初始化我的 thing 并且仍然能够调用 init(windowNibName:)，它本身就是一个便利的初始化器？我宁愿不必自己重新实现 nib 加载，但如果我只能使用指定的初始化器，我该如何避免呢？

Answer 1

根据 NSWindowController 文档:

You can also implement an NSWindowController subclass to avoid requiring client code to get the corresponding nib's filename and pass it to init(windowNibName:) or init(windowNibName:owner:) when instantiating the window controller. The best way to do this is to override windowNibName to return the nib's filename and instantiate the window controller by passing nil to init(window:). Using the init(window:) designated initializer simplifies compliance with Swift initializer requirements.

您可以将您的类实现为:

class MyWindowController: NSWindowController
{
    let thing: Thing

    override var windowNibName: NSNib.Name? {
        return NSNib.Name(rawValue: "MyNib")
    }

    init(thing: Thing) {
        self.thing = thing

        super.init(window: nil)
    }

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