iphone - 从起始角度旋转 CALayer

Question

我想使用byValue连续旋转图层，但我无法使其正常工作。我想每秒旋转 6 度，在 60 秒内旋转一整圈。

如果图层的初始旋转为0，则一切正常。

问题是当我尝试设置初始 fromValue 时。如果我将 fromValue 设置为 90 度，动画将从 90 旋转到 90+6，然后跳转到 90+(90+6)，制作动画，然后再次跳转。

有什么想法吗？

CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];

animation.fromValue = [NSNumber numberWithDouble:M_PI_2];
animation.byValue = [NSNumber numberWithDouble:6.0f*M_PI/180.0f];
animation.toValue = nil;

animation.fillMode = kCAFillModeForwards;
animation.cumulative = YES;
animation.additive = NO;
animation.repeatCount = 10000;
animation.removedOnCompletion = YES;
animation.duration = 1.0;
[myLayer addAnimation:animation forKey:@"transform"];

Answer 1

这对我有用:

CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath: @"transform"];
CATransform3D transform = CATransform3DMakeRotation (DegreesToRadians (90), 0, 0, 1);
animation.toValue = [NSValue valueWithCATransform3D: transform];
animation.duration = 60;
animation.cumulative = NO;
animation.repeatCount = 10000;
animation.removedOnCompletion = YES;