360度移动图像

Question

如何将图像从起点360度移动到终点？360度移动图像？

Answer 1

可以按一定数量的弧度旋转视图，而不必将旋转拆分为多个部分，而不管它是小于完全旋转还是完全旋转的倍数。例如，下面的代码将每秒旋转视图一次，持续指定的秒数。您可以轻松地对其进行修改，以按一定数量的旋转或按一定数量的弧度旋转视图。

- (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"];
}

Answer 2

在任意轴上旋转360度会使视图保持不变。所以不要碰图像，你就可以走了！

Answer 3

您也可以使用动画函数(CAValueFunction)来实现这一点：

CABasicAnimation *rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];
rotationAnimation.duration = duration;
rotationAnimation.fromValue = [NSNumber numberWithFloat:0.0];
rotationAnimation.toValue = [NSNumber numberWithFloat:M_PI * 2.0];
rotationAnimation.valueFunction = [CAValueFunction functionWithName:kCAValueFunctionRotateZ];
rotationAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];

[myView.layer addAnimation:rotationAnimation forKey:nil];