Question

I am creating a simple tennis game in Objective-C. Currently, when the player or the computer scores, it gives a message “tap to begin” and that releases the ball (it’s a bit awkward to have your thumb on the racquet and another thumb to tap it to begin).

How do I add a timer into my game so that I don’t have to tap after every score?

(This code is the resetting method when there is a new game and when there is a score)

{

self.gameState = kGameStatePaused;

ball.center = self.view.center;

if(newGame)

{
    if(computerScoreValue > playerScoreValue)

    {
        tapToBegin.textAlignment = UITextAlignmentCenter;
        tapToBegin.text = @"Computer Wins!";
        AudioServicesPlaySystemSound(booFileID);
    }

    else

    {
        tapToBegin.textAlignment = UITextAlignmentCenter;
        tapToBegin.text = @"You Win!";
        AudioServicesPlaySystemSound(clappingFileID);
    }

    computerScoreValue = 0;
    playerScoreValue = 0;
}
else
{
    tapToBegin.textAlignment = UITextAlignmentCenter;
    tapToBegin.text = @"Tap to Begin";

}
playerScore.text = [NSString stringWithFormat:@"%d",playerScoreValue];
computerScore.text = [NSString stringWithFormat:@"%d",computerScoreValue];

}

Answer 1

NSTimer should work. If you’re curious take a look at CADisplayLink too.