iOS触控：快速和慢速触控移动

Question

I'm trying to make touch mouse using iPhone. I want know how to make different slow move and fast move. I want make the cursor on PC move far when I move touch fast on iPhone. Currently, mine move same distance(pixels) for both slow and fast. Some velocity is required. Is there any simple idea or proper framework?

Answer 1

I'm assuming you're already using a pan gesture recognizer, or at least know how to hook one up for this. If you do that, you can get velocity this way:

- (void) handlePan:(UIPanGestureRecognizer *)pan {
    CGPoint velocity = [pan velocityInView:self.view];
    NSLog(@"Horizontal velocity: %f", velocity.x);
    NSLog(@"Vertical velocity: %f", velocity.y);
}

Velocity is returned as a CGPoint where the x value represents horizontal velocity and the y value represents vertical velocity. The further the value is from 0, the faster it is.