iphone - How to rotate an UIImageView with CATransform3DRotate make an effect like Door Opening?

Question

I've read and try this article (Opening door effect using Core Animation)

And I implement following code in my app:

    CALayer *layer = threeHomeView.layer;
CATransform3D initialTransform = threeHomeView.layer.transform;
initialTransform.m34 = 1.0 / -900;

[UIView beginAnimations:@"Scale" context:nil];
[UIView setAnimationDuration:3];
layer.transform = initialTransform;
CATransform3D rotationAndPerspectiveTransform = threeHomeView.layer.transform;

rotationAndPerspectiveTransform = CATransform3DRotate(rotationAndPerspectiveTransform
                                                      , 40.0f * M_PI / 180.0f
                                                      , 0.0f
                                                      , 1.0f
                                                      , 0.0f);
layer.transform = rotationAndPerspectiveTransform;

[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:@selector(threeHomeFlyOut)];
[UIView commitAnimations];  

threeHomeView is an UIImageView.

MY QUESTION IS: the image can only rotate by middle vertical line of the image, but I want it to rotate by left vertical line of the image.

Answer 1

Use CATransform3DRotate like you did in combination with CATransform3DTranslate to rotate around the edge, like I did in this answer. Here's a little excerpt (you will need to modify this for your own uses):

CATransform3D t = CATransform3DIdentity;
t = CATransform3DTranslate(t, 0, -self.view.bounds.size.height/2, 0);
t = CATransform3DRotate(t, rec.scale * M_PI, 1, 0, 0);
t = CATransform3DTranslate(t, 0, -self.view.bounds.size.height/2, 0);
self.view.layer.transform = t;