How to initialize a NSWindowController in Swift?
appkit, cocoa, swift
Solution
`NSWindowController` has 2 designated initializers:
init(window: NSWindow!)
init(coder: NSCoder!)
When creating a subclass, you should invoke the designated initializer of its superclass. Recent versions of Xcode enforce this. Either via built-in language mechanism (Swift) or via `NS_DESIGNATED_INITIALIZER` macro (Objective-C).
Swift additionally requires that you call the superclasses designated initializer when you override a convenience initializer. From the "Initialization: Designated Initializers and Convenience Initializers" section of Swift Programming Guide:
If the initializer you are overriding is a convenience initializer, your override must call another designated initializer from its own subclass, as per the rules described above in Initializer Chaining.
In your case, you should probably override `init(window: NSWindow!)` and call super's counterpart from there.
Problem
I want to initialize a window controller object from a nib file, quite easy right? But I simply can't get it to work. According to my previous experience in ObjC, I've written down the following code: ``` init() { super.init(windowNibName: "SplitWindowController") } ``` And in the app delegate file, I simply init and displays the window: ``` var myWindowController: MyWindowController = MyWindowController() myWindowController.showWindow(self) myWindowController.window.makeKeyAndOrderFront(nil) ``` But the compiler gives me this error: `Must call a designated initializer of the superclass 'NSWindowController'`. And according to the Swift version of `NSWindowController` definition, there are only 3 designated initializers, namely `init()`, `init(window)`, `init(coder)`. I don't know what to do next. Shall I build a `NSCoder` from a nib file, which I don't know how to do?