CATransform3D rotate causes half of image to disappear

Question

I\'m using the following code to rotate an image, but half the image (down the y-axis) that has been rotated \"out of\" the page, disappears. How to fix? heading i

Answer 1

  layer.anchorPoint = CGPointMake(0.0, 0.0);

Answer 2

Setting the anchorPoint to {0.0, 0.0} works as well (as Liam already pointed out).

Here's the full code snippet for changing the anchorPoint without changing the layer's position on screen:

     layer.anchorPoint = CGPointMake( 0.0, 0.0 );

     CGPoint position = layer.position;
     CGSize size = layer.bounds.size;

     CGFloat posX = position.x - size.width / 2.0;
     CGFloat posY = position.y - size.height / 2.0;

     layer.position = CGPointMake( posX, posY );

Answer 3

The solution to this was to set the zPosition property of all my layers appropriately. Thanks is due to @Brad Larson, who suggested this solution in a comment here. It seems that, when you start using CATransform3D, the normal zindex view hierarchy established by addsubview is thrown out the window.