A count of started touches is not equal to count of finished touches

Question

I have the following code for testing purposes:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self customTouchHandler:touches];
}

- (v         


        

Answer 1

Also have this problem.

Only solution i found at this moment based on observing touch phase:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"Began %lu of %lu", [touches count], [event.allTouches count]);

    for (UITouch *touch in touches) {
        [touch addObserver:self forKeyPath:@"phase" options:0 context:nil];
    }
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"Ended %lu of %lu", [touches count], [event.allTouches count]);
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {

    if ([object isKindOfClass:[UITouch class]]) {
        UITouch *touch = object;
        NSLog(@"Touch %lu phase: %ld", (unsigned long)[touch hash], [touch phase]);
        if (touch.phase == UITouchPhaseEnded || touch.phase == UITouchPhaseCancelled) {
            NSLog(@"Touch %lu ended", (unsigned long)[touch hash]);
            [touch removeObserver:self forKeyPath:@"phase"];
        }
    }
}