how to spin CALayer.

Question

How to spinning the CALayer on current location?

thanks in advance

Answer 1

- (CAAnimation*)animationForSpinning {

    // Create a transform to rotate in the z-axis
    float radians = DegreesToRadians( 360 );
    CATransform3D transform;
    transform = CATransform3DMakeRotation(radians, 0, 0, 1.0);

    // Create a basic animation to animate the layer's transform
    CABasicAnimation* animation;
    animation = [CABasicAnimation animationWithKeyPath:@"transform"];

    // Now assign the transform as the animation's value. While
    // animating, CABasicAnimation will vary the transform
    // attribute of its target, which for this transform will spin
    // the target like a wheel on its z-axis. 
    animation.toValue = [NSValue valueWithCATransform3D:transform];

    animation.duration = 2;  // two seconds
    animation.cumulative = YES;
    animation.repeatCount = 10000;  "forever"
    return animation;
}

- (void)spinLayer:(CALayer*)layer {

    // Create a new spinning animation
    CAAnimation* spinningAnimation = [self animationForSpinning];

    // Assign this animation to the provided layer's opacity attribute.
    // Any subsequent change to the layer's opacity will
    // trigger the animation.
    [layer addAnimation:spinningAnimation forKey:@"opacity"];

    // So let's trigger it now
    layer.opacity = 0.99;
}

I used Above code for animation.....

But i want my CALayer rotate self. what to do?

any one help me out.