Gesture callback to convert a pan into seconds.

pan-to-seconds.m

- (void)secondPan:(UIPanGestureRecognizer *)gesture
{
    if ((gesture.state == UIGestureRecognizerStateChanged) ||
        (gesture.state == UIGestureRecognizerStateEnded)){
        
        CGPoint location = [gesture locationInView:gesture.view.superview];
        
        int topBound = gesture.view.bounds.size.height / 2.0f;
        float bottomBound = gesture.view.superview.bounds.size.height - topBound;
        
        float position;
        if(location.y <= topBound){
            position = topBound;
        }else if(location.y >= bottomBound){
            position = bottomBound;
        }else{
            position = location.y;
        }
        gesture.view.center = CGPointMake(gesture.view.center.x, position);
        
        self.secondsAmount.frame = CGRectMake(0, 0, self.minuteBounds.frame.size.width, position-topBound);
        
        int time = (59 / (bottomBound - topBound)) * (position - topBound);
        
        NSString *formattedTime = (time < 10) ? [NSString stringWithFormat:@"0%d",time] : [NSString stringWithFormat:@"%d",time];
        
        self.seconds.text = formattedTime;
    }
}