Call touchesEnded only if no touches on view - touch

Question

Currently, if I tap with two fingers on my screen and remove one of them but keep pressing with the other finger, the touchesEnded-method will get called.
But I want that the method only does something if there are no more touches in the view.
How can I check within the touchesEnded-method if there are still touches on the scene?

Answer 1

The touchesBegan and touchesEnded methods get called each time for each touch that occurs on the screen. Each touch on the screen is associated with a UITouch object. You can find all touches that are associated with the event in the (NSSet*) touches object that is a parameter for these methods.
You need to keep track of the original touch using a global variable.
In your gameScene's implementation:
#implementation GameScene
{
UITouch* currentTouch; //This variable will keep track of the touch.
}
Now, in the touchesBegan method:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
/* Called when a touch begins */
for (UITouch *touch in touches) {
if (currentTouch == nil) {
currentTouch = touch;
//Handle touch code here, not outside.
}
}
}
And in the touchesEnded method:
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
for (UITouch *touch in touches) {
if ([touch isEqual:currentTouch]) {
//This is the tracked touch, handle touch ending here.
currentTouch = nil;
}
}
}
The above code should help you handle touch for a single touch object.
For a better understanding, you can read up on the Apple's touch handling guide here.