Swift Must call a designated initializer of the superclass uiinputviewcontroller

问题

I get the error in the subject after this morning's upgrade to 8.3.

The code below used to work perfectly, however it doesn't compile anymore. Can any of you please help me?

protocol CustomAccessoryProtocol {
    func controlButtonPressed(tag:Int)
}

class CustomAccessory : UIInputViewController {
    var accessoryView : UIView!
    var delegate : CustomAccessoryProtocol!

    @IBOutlet weak var returnButton: UIButton!
    @IBOutlet weak var backButton: UIButton!
    @IBOutlet weak var forwardButton: UIButton!

    init(delegate: CustomAccessoryProtocol){
        super.init()
        self.delegate = delegate
    }

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        fatalError("init(coder:) has not been implemented")
    }

    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        let customNib = UINib(nibName: "CustomAccessory", bundle: nil)
        accessoryView = customNib.instantiateWithOwner(self, options: nil)[0] as! UIView
    }

    @IBAction func buttonPress(sender: AnyObject) {
        delegate.controlButtonPressed(sender.tag!)
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(accessoryView)
    }
}

回答1:

I had the same problem on the following code with NSWindowController:

init() {
    super.init()
}

I changed it to:

convenience init() {
    self.init()
}

I'm thinking that Apple is enforcing convenience inits more strictly than before.

来源：https://stackoverflow.com/questions/29531133/swift-must-call-a-designated-initializer-of-the-superclass-uiinputviewcontroller