iphone - 如何使用 CATransform3DRotate 旋转 UIImageView 做出类似开门的效果？

Question

我已阅读并尝试此 article (Opening door effect using Core Animation)

我在我的应用程序中实现了以下代码:

    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];  

twoHomeView 是一个 UIImageView。

我的问题是:图像只能按图像的中间垂直线旋转，但我希望它按图像的左侧垂直线旋转。

Answer 1

使用CATransform3DRotate，就像与CATransform3DTranslate结合使用一样，围绕边缘旋转，就像我在this answer中所做的那样。以下是一些摘录(您需要对其进行修改以供自己使用):

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;