Question

Basically, I’m rotating a layer about a point as :

CATransform3D transform = CATransform3DIdentity;
transform.m34 = 1.0 / -500;
transform = CATransform3DTranslate(transform, rotationPoint.x-center.x, rotationPoint.y-center.y, 0.0);
transform = CATransform3DRotate(transform, (rotationAngleFor) * M_PI / 180.0f, 0.0, 1.0, 0);
transform = CATransform3DTranslate(transform, center.x-rotationPoint.x, center.y-rotationPoint.y, 0.0);

I also create a layer, add it to a bigger layer and then apply the transform to it:

[self.layer addSublayer:myLayer];
myLayer.transform = transform;

How to animate this?

Note- Putting this in a UIView animation block doesn’t work.

Answer 1

Edit: As @DuncanC pointed out my description did not match the actual code.

You can use a CABasicAnimation that is added to the layer as follows.

CABasicAnimation *transformAnimation = [CABasicAnimation animationWithKeyPath: @"transform"];

    <here goes your definition of transform>

transformAnimation.toValue = [NSValue valueWithCATransform3D:newTransform];
transformAnimation.duration = 10;
[self.layer addAnimation:transformAnimation forKey:@"transform"];

This animation performs a continuous change of the transform property of the layer from the original value of the transform property of the layer to the newTransform transformation. The change takes 10 seconds.