Swift: Initializer does not override a designated initializer from its superclass

Question

Im trying to inherit a class I made that inherits NSObject, those are the snippets:

bPlayer.swift:

import UIKit
import Foundation
import QuartzCore

class bluetoothPlayer: player {

    override init (game: MultiGame) {
        super.init(game: game)

    }

}

Player.swift:

import UIKit
import Foundation
import QuartzCore

class player: NSObject {

    init (game: NSObject) {
        super.init()

    }

}

But I get the following error:

Initializer does not override a designated initializer from its superclass

If I delete the "override" keyword from the bluetoothPlayer init, the following error comes up instead:

Initializer 'init(game:)' with Objective-C selector 'initWithGame:' conflicts with initializer 'init(game:)' from superclass 'player' with the same Objective-C selector

score 2 · Answer 1 · edited May 23 '17 at 12:29

That's because you didn't. You didn't override the function, you overloaded it. You made a new function (init) with the same name but different parameters. This doesn't count as overriding a function.

See this SO question (in Java, however). See this other SO question about overriding multiple functions in Swift.

This is because NSObject ≠ MultiGame

You can override your init function by declaring it like so in bluetoothPlayer:

override init (game: NSObject) {
    super.init(game: game)
}

You can do a check to make sure that game is of type MultiGame to achieve the same effect as what you wrote though.

Swift: Initializer does not override a designated initializer from its superclass

1 Answers1