Delegate in Swift-language

Question

I have two controllers and i need call up function the first controller to second controller: In second controller I have created protocol and init delegate in class:

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Answer 1

I am going to make an assumption you are using storyboards. If I am correct, then your issue is that your secondController, created in your First Controller, is not the actual one you are presenting. You will need to set secondController in your prepareForSegue:

Second Controller

Unchanged

First Controller

class ViewController: UIViewController, testProtocol {

    // you will want to add the ? since this variable is now optional (i.e. can be nil)
    var secondController: SecondViewController? // don't assign it a value yet

    // ...

    // implementation of the protocol
    func testDelegate() {
        println("Hello delegate")
    }

    // your prepare for segue
    override func prepareForSegue(segue: UIStoryboardSegue?, sender: AnyObject?) {
        // get the controller that storyboard has instantiated and set it's delegate
        secondController = segue!.destinationViewController as? SecondViewController
        secondController!.delegate = self;
    }
}