Question

I’m trying to make a compass.

Basically I use an image of a compass needle as the directions-thing for the compass. It’s animating fine around the center of the compass UNTIL I switch view, or add another view (ex. UIActionView or switch to another view controller):

    - (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading{

            float oldRadian = (-manager.heading.trueHeading *M_PI /180.0f);
            float newRadian = (-newHeading.trueHeading *M_PI /180.0f);

            CABasicAnimation *animation;
            animation=[CABasicAnimation animationWithKeyPath:@"transform.rotation"];
            animation.fromValue = [NSNumber numberWithFloat:oldRadian];
            animation.toValue = [NSNumber numberWithFloat:newRadian];
            animation.duration = 0.5f;

            [compassArrow.layer addAnimation:animation forKey:@"animateMyRotation"];
            compassArrow.transform = CGAffineTransformMakeRotation(newRadian);
}

After this I’m switching to another view controller that is the compassArrow imageview that was animating & started floating around.

Any ideas why this happens??

Answer 1

I solved it using the removeFromSuperlayer-method before I change view. Problem was that I created multiple animations for the same key (@”animateMyRotation”).

[compassArrow.layer removeFromSuperlayer];