TouchMoved and wrong screen range? or Bug in iOS?

Question

I found interesting bug in iOS, but trying to belive that i\'m wrong. You have to do 2 things:

1) Create single-view template for iOS

2) Write small function i

Answer 1

I found this from one of Apple's tutorials on a finger-painting program:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    CGRect              bounds = [self bounds];
    UITouch*    touch = [[event touchesForView:self] anyObject];
    firstTouch = YES;
    // Convert touch point from UIView referential to OpenGL one (upside-down flip)
    location = [touch locationInView:self];
    location.y = bounds.size.height - location.y;
}

Looks like you need to convert the touch to OpenGL coordinates to get the result you are expecting. Hope this helps.