How to branch programmatically in iOS objective C, compared to C#

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C

C#

Objective-C

I implement a simple logic state control in C#, by using a void function delagate. I would like to do the same thing in Objective C for my iPhone project, but I am too Newb to figure out what to do. I placed my pseudo-ObjC below. Maybe using an SEL selector maybe? I need a way to dynamically change the flow at runtime.

IN C# --

public delegate void State();   // create anonymous delegate "void function()"

and a set of functions like

    public void SetGameState(State newState)
    {
        //   lastState = currentState;  // not used yet..
        GameState -= currentState;  // unsubscribe current function
        currentState = newState;    // assign new function to the variable

        GameState += currentState;  // subscribe the new function

        gameSubState = GSS.GSS_0;   // apply initial game sub state.
    }

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
    SetGameState(DoState1);  // assign the 1st state to DoState1()
        masterGameTimer = new GameTimer();
        masterGameTimer.UpdateInterval = TimeSpan.FromTicks(333333);
        masterGameTimer.Update += OnUpdate;
        masterGameTimer.Start();
    }

    private void OnUpdate(object sender, GameTimerEventArgs e)
    {
        GameState(); // this redirects execution to the assigned state
    }

    private void DoState1()  // 1st state
    {
    SetGameState(DoState2);
}
    private void DoState2()  // 2nd state
    {
    SetGameState(DoState1);  // and back around we go!
}

This is just a guess at the Objective C, but I hope this looks like what I am trying to ask. Thanks.

-(void)SetGameState:(SEL) newState  // assign a new state
{
    gameState=newState;
    gameSubState=GSS_0;
}

-(void)viewDidLoad
{
    [super viewDidLoad];

    [NSTimer scheduledTimerWithTimeInterval:0.033f target:self
                  selector:@selector(Update:) userInfo:nil repeats:YES];
    [SetGameState DoState1];     // set an initial gameState 
}

-(void)DoState1: (id) sender
{    
    [SetGameState DoState2];  // first state,
}

-(void)DoState2: (id) sender
{    
    [SetGameState DoState1];  // then 2nd state, and back around
}

-(void)Update: (id) sender
{
    [self.gameState]; // this won't work, but the idea would be to execute the assigned state. and programatically change it.
}

Mucho gracias.