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我做了研究，看到了很多关于我的问题的问题。我的问题是，我有一个 CATransformLayer，我在其中绘制一个 3D 立方体。现在要旋转立方体，我使用的是 CABasicAnimation，其代码如下：

/* Code to add cube to the view */
transformLayer = [CATransformLayer layer];
transformLayer.anchorPoint = P(.5,.5);
transformLayer.bounds=CGRectMake(0,0,480,300 );
transformLayer.frame=CGRectMake(0,300, 480, 300);
transformLayer.position=P(240,150);


[transformLayer addSublayer:sideOne];
[transformLayer addSublayer:sideTwo];
[transformLayer addSublayer:sideThree];
[transformLayer addSublayer:sideFour];
[transformLayer addSublayer:sideFive];
[transformLayer addSublayer:sideSix];

transformLayer.anchorPointZ = Layer_Size/-2;


/* code to tilt the cube so that it looks 3D */    
float degreesVariance = 130;
float radiansToRotate = DegreesToRadians( degreesVariance );
transformLayer.transform=CATransform3DMakeRotation(radiansToRotate, 1, 1, 0.0);
[rootLayer addSublayer:transformLayer];

动画代码如下：

/* code to rotate the cube */
CABasicAnimation *spinningAnimationX;
spinningAnimationX = [CABasicAnimation animationWithKeyPath:@"transform.rotation.x"];
spinningAnimationX.fromValue=0;
spinningAnimationX.toValue = [NSNumber numberWithFloat: DegreesToRadians(270) * 1* 1 /*rotations*/ * 2 ];
spinningAnimationX.duration = 2;
spinningAnimationX.repeatCount = 1.0; 
[spinningAnimationX setRemovedOnCompletion:NO];
spinningAnimationX.fillMode = kCAFillModeForwards;

/* code to add to the layer */
CAAnimationGroup *group = [CAAnimationGroup animation];
[group setDuration:2];
[group setRemovedOnCompletion:NO]; 
[group setAnimations:[NSArray arrayWithObjects: spinningAnimationX, nil]];
[transformLayer addAnimation:group forKey:nil];

尽管将 removeOnCompletion 设置为 NO 和 setFillMode，但我尝试旋转的 CATransformLayer 并没有在动画后以角度结束。它只回弹到之前的原始位置。

请帮帮我，如果我忽略了任何东西，请告诉我。

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