将CALayer旋转90度？ [英] Rotating a CALayer 90 degrees?

问题描述

如何将 CALayer 旋转90度？我需要旋转所有包括子图层和坐标系的东西。

How do I rotate a CALayer 90 degrees? I need to rotate everything include sublayers and the coordinate system.

推荐答案

如果要设置动画效果，则在我的动画中使用类似的东西应用程序：

If I'm animating it I use something like this in my apps:

- (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，您可以在任何地方使用它，不必从一种不适合您需要的方法。

Of course you can use it anywhere, don;t have to return it from a method if that doesn;t suit your needs.

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