Detect touch on the left/right part of the screen

Question

I want to create a game, but I need to detect if the screen was touched on the left or the right side of the screen (in landscape). How can I do that?

Answer 1

I suggest looking at a good tutorial for iOS before posting questions, e.g. iOS Stanford. However, in the mean time, something like this would to the trick:

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *myTouch = [touches anyObject];

    CGPoint aPoint = [myTouch locationInView:self.view];

    if(aPoint.x < 160) { //Left
        NSLog(@"Tapping on the left side of the screen is for communists!");
    else // Right
        NSLog(@"User tapped on the right side! Ohh Yeah!");
}