iOS detecting multiple touches at once - ios

Question

I'm creating a game, and currently if you touch the left half of the screen a gun rotates clockwise and if you touch the right half of the screen it shoots.
I want to create an action so that if I touch the left half of the screen it will rotate clockwise and if you touch the right half it rotates counterclockwise. THIS IS EASY.
I want the shooting to happen if I'm touching the left and right half's at the same time. How is this possible to detect 2 touches at the same time.
This is the code for rotating clockwise if touching the left half and shooting when touching the right half
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint touchPoint = [touch locationInView:self.view];
if (touchPoint.x < self.size.width / 2.0 ) {
isTouching = true;
}
else
[self setupBullet];
}

Answer 1

You will need to either setup two separate objects that listen for touch events in their respective side, or you can use the event.allTouches object and get a complete array of all current touch objects and do with that array as you will.
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
//either:
if(touch in left side)
{
//Left side touch down, create object
}
else
{
//Right side touch down, create object
}
//Or:
NSArray *arrayOfAllTouches = event.allTouches;
//Now loop through that array and see what is going on on screen
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
//either:
if(touch in left side)
{
//Left side release, release object
}
else
{
//Right side release, release object
}
//Or:
NSArray *arrayOfAllTouches = event.allTouches;
//Now loop through that array and see what is going on on screen
}