如何将此视图旋转到弧度或度数的特定值？

Question

究竟是0到1这个东西是什么？例如，我怎样才能将图层完全旋转到170度？

CALayer* viewLayer = myView.layer; 
    CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; 

    animation.fromValue = [NSNumber numberWithFloat:0.0 * M_PI]; 
    animation.toValue = [NSNumber numberWithFloat:1.0 * M_PI]; 

    animation.duration = 1.0; 
    animation.cumulative = YES; 
    animation.repeatCount = 2; 
    animation.removedOnCompletion = NO; 
    animation.fillMode = kCAFillModeForwards; 

    [viewLayer addAnimation:animation forKey:@"transform.rotation.z"]; 

Answer 1

不知道可可，我会说toValue指定1.0Pi弧度旋转。 360度内有2Pi弧度。因此1.0Pi代表180度。为了获得170度旋转，我将设置为值

animation.toValue = [NSNumber numberWithFloat:(170.0/180.0) * M_PI];