Swift: Asynchronous callback

Question

How do I make asynchronous callbacks in swift? I\'m writing a little Framework for my app because it\'s supposed to run on both, iOS und OS X. So I put the main code that is

Answer 1

I've just made this little example: Swift: Async callback block pattern example

Basically there is ClassA:

//ClassA it's the owner of the callback, he will trigger the callback when it's the time
class ClassA {
    //The property of that will be associated to the ClassB callback
    var callbackBlock : ((error : NSError?, message : String?, adress : String? ) -> Void)?

    init() {
        //Do Your staff
    }

    //Define your function with the clousure as a parameter
    func yourFunctionWithCallback(#functionCallbackParameter : (error : NSError?,message : String?, adress : String?) -> ()) {
        //Set the calback with the calback in the function parameter
        self.callbackBlock = functionCallbackParameter
    }

    //Later On..
    func callbackTrigger() {
        self.callbackBlock?(error: nil,message: "Hello callback", adress: "I don't know")

    }
}

And ClassB:

//ClassB it's the callback reciver the callback
class ClassB {
    @IBAction func testCallbackFunction(sender: UIButton) {
        let classA = ClassA()
        classA.yourFunctionWithCallback { (error, message, adress) -> () in
            //Do your stuff
        }
    }
}

ClassA: it's the owns a property witch is the callbackBlock. ClassB will set this property by Call the yourFunctionWithCallback function. Later on then ClassA it's ready, will trigger the callback by calling the callBackBlock inside the callbackTrigger function.

ClassB: will call the ClassA method to set the callback block and wait until the block has been triggered.