Return completionCallback after completing internal callbacks

gistfile1.txt

 private func initView(completionCallback: (() -> ())? = nil) {
        var callbacksLeft = 2

        func checkCompleted() {
            callbacksLeft -= 1
            if callbacksLeft == 0 {
                completionCallback?()
            }
        }

        connectSocketServer() {
            checkCompleted()
        }

        loadPrivateMessages() {
            checkCompleted()
        }
    }