将CALayer旋转90度？

Question

如何将CALayer旋转90度？我需要旋转一切包括子层和坐标系.

Answer 1

OBJ-C:

theLayer.transform = CATransform3DMakeRotation(90.0 / 180.0 * M_PI, 0.0, 0.0, 1.0);

迅速:

theLayer.transform = CATransform3DMakeRotation(90.0 / 180.0 * .pi, 0.0, 0.0, 1.0)

也就是说,将层变换为使其旋转90度(π/ 2弧度),其中100%的旋转发生在z轴周围.

Answer 2

如果我动画它我在我的应用程序中使用这样的东西:

- (NSObject *) defineZRotation {
    // Define rotation on z axis
    float degreesVariance = 90;
    // object will always take shortest path, so that
    // a rotation of less than 180 deg will move clockwise, and more than will move counterclockwise
    float radiansToRotate = DegreesToRadians( degreesVariance );
    CATransform3D zRotation;
    zRotation = CATransform3DMakeRotation(radiansToRotate, 0, 0, 1.0);  
    // create an animation to hold "zRotation" transform
    CABasicAnimation *animateZRotation;
    animateZRotation = [CABasicAnimation animationWithKeyPath:@"transform"];
    // Assign "zRotation" to animation
    animateZRotation.toValue = [NSValue valueWithCATransform3D:zRotation];
    // Duration, repeat count, etc
    animateZRotation.duration = 1.5;//change this depending on your animation needs
    // Here set cumulative, repeatCount, kCAFillMode, and others found in
    // the CABasicAnimation Class Reference.
    return animateZRotation;
}

当然你可以在任何地方使用它,不必从方法返回它,如果那不适合你的需要.

Answer 3

基本上是这样的:

CGAffineTransform rotateTransform = CGAffineTransformMakeRotation(M_PI / 2.0); [myCALayer setAffineTransform:rotateTransform];

编辑:它将顺时针或逆时针旋转,具体取决于平台(iOS或Mac OS).