CA Spring Animation Example

gistfile1.txt

- (void)animateRefreshButton:(BOOL)willAnimate{
    if (willAnimate) {
        [self.btnRefresh setEnabled:NO];
        
        CASpringAnimation* springRotation = [CASpringAnimation animationWithKeyPath:@"transform.rotation.z"];
        springRotation.toValue = [NSNumber numberWithFloat: M_PI * 2.0 /* full rotation*/];
        springRotation.duration = 2.0f;
        springRotation.cumulative = YES;
        springRotation.repeatCount = INT_MAX;
        springRotation.damping = 8;
        [self.btnRefresh.layer addAnimation:springRotation forKey:@"rotationAnimation"];    
    }else{
        [self.btnRefresh setEnabled:YES];        
        [self.btnRefresh.layer removeAllAnimations];
    }
}