可可 – 将Swift和init(windowNibName)中的NSWindowController子

// this overrides none of designated initializers
class MyWindowController: NSWindowController {
    override func windowDidLoad() {
        super.windowDidLoad()
    }
}

// this one overrides all of them
//
// Awkwardly enough,I see only two initializers 
// when viewing `NSWindowController` source from Xcode,// but I have to also override `init()` to make these rules apply.
// Seems like a bug.
class MyWindowController: NSWindowController
{
    init()
    {
        super.init()
    }

    init(window: NSWindow!)
    {
        super.init(window: window)
    }

    init(coder: NSCoder!)
    {
        super.init(coder: coder)
    }

    override func windowDidLoad() {
        super.windowDidLoad()
    }
}

// this will work with either of the above
let mwc: MyWindowController! = MyWindowController(windowNibName: "MyWindow")

这在语言指南中的“初始化/自动初始化器继承”中介绍：

However,superclass initializers are automatically inherited if certain conditions are met. In practice,this means that you do not need to write initializer overrides in many common scenarios,and can inherit your superclass initializers with minimal effort whenever it is safe to do so.

Assuming that you provide default values for any new properties you introduce in a subclass,the following two rules apply:

Rule 1
If your subclass doesn’t define any designated initializers,it automatically inherits all of its superclass designated initializers.

Rule 2 If your subclass provides an implementation of all of its superclass designated initializers—either by inheriting them as per rule 1,or by providing a custom implementation as part of its definition—then it automatically inherits all of the superclass convenience initializers.