[英]Rotating a CALayer from a start angle
我想使用byValue
连续旋转图层,但是无法使其正常工作。 我想每秒旋转6度,以在60秒内完全旋转。
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
。 如果将fromValue
设置为90度,则动画将从90旋转到90 + 6,然后跳转到90+(90 + 6),进行动画处理,然后再次跳转。
任何的想法?
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"];
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;
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