iphone UIImageView旋转 [英] iphone UIImageView rotation

问题描述

任何人都可以告诉我如何以圆周运动旋转图像

Can anyone tell me how to rotate an image in circular motion

推荐答案

您可以旋转视图，通过一定数量的弧度，无论是小于完整旋转还是多次完整旋转，都不必将旋转分成碎片。例如，以下代码将每秒一次旋转视图达指定的秒数。您可以轻松修改它以按一定数量的旋转或某些弧度旋转视图。

You can rotate a view, by some number of radians, regardless of whether it is less than a full rotation or many multiples of a full rotation, without having to split the rotation into pieces. As an example, the following code will spin a view, once per second, for a specified number of seconds. You can easily modify it to spin a view by a certain number of rotations, or by some number of radians.

- (void) runSpinAnimationWithDuration:(CGFloat) duration;
{
    CABasicAnimation* rotationAnimation;
    rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2.0 /* full rotation*/ * rotations * duration ];
    rotationAnimation.duration = duration;
    rotationAnimation.cumulative = YES;
    rotationAnimation.repeatCount = 1.0; 
    rotationAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];

    [myView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
}

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