Question

Basically I’m attempting a put your finger on the globe and spin it type function.

So all I really need to do is grab the direction of the swipe and velocity with a short timer (?500ms?)

So something like

While(swiping) {
   Get(pointTouched);
   swipeDirection = Calc(direction);
   swipeSpeed = Calc(speed);

   FramesToPlay = swipeSpeed * ConstantAmount;

   If(Direction == Backwards){
      FramesToPlay = FramesToPlay * -1;
   }

   Play(playAnimation, FramesToPlay);

   wait(500ms);
}

Anyone know anything like this? Or any pieces I can cobble together?

I have the Animation figured out it’s just the details on this swiping that have me a touch confused.

Answer 1

You could probably use a UIPanGestureRecognizer which has a velocityInView: method. I haven’t tested this, but seems like it should work:

- (void)handlePanGesture:(UIPanGestureRecognizer *)pan
{
    if (pan.state == UIGestureRecognizerStateEnded)
    {
        CGPoint vel = [pan velocityInView:self.view];
        [self doSpinAnimationWithVelocity:vel.x];
    }
}

In addition, when pan.state == UIGestureRecognizerChanged, you can have your globe turn along with the finger.