看看这个博客文章。

示例：（ label = UILabel ）

// UIView's transform property is a CGAffineTransform.
[UIView beginAnimations:nil context:NULL]; // arguments are optional
view.transform = CGAffineTransformMakeRotation(M_PI_2);
[UIView commitAnimations];

// CALayer's transform property is a CATransform3D.
// rotate around a vector (x, y, z) = (0, 0, 1) where positive Z points
// out of the device's screen.

label.layer.transform = CATransform3DMakeRotation(M_PI_2, 0, 0, 1);