iphone 动画：为什么围绕 X 轴旋转 UILabel 会切断其下半部分？
我想围绕 X 轴旋转 UILabel，并为其设置动画。但是当动画开始时，标签的文本会被水平切成两半。下半部分消失，上半部分在旋转。为什么？
这是代码：
CATransform3D _3Dt = CATransform3DMakeRotation(radians(90.0f), 1.0, 0.0, 0.0);
CABasicAnimation *transformAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];
transformAnimation.removedOnCompletion = NO;
transformAnimation.toValue = [NSValue valueWithCATransform3D:_3Dt];
transformAnimation.fillMode = kCAFillModeForwards;
（sdk 3.0）
I want to rotate a UILabel around the X axis, and animating it. But when the animation starts, the text of the label is cut in two, horizontally. The bottom half disappears, the upper half is rotating. Why?
Here's the code:
CATransform3D _3Dt = CATransform3DMakeRotation(radians(90.0f), 1.0, 0.0, 0.0);
CABasicAnimation *transformAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];
transformAnimation.removedOnCompletion = NO;
transformAnimation.toValue = [NSValue valueWithCATransform3D:_3Dt];
transformAnimation.fillMode = kCAFillModeForwards;
(sdk 3.0)
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X轴？这意味着在旋转期间 UILabel 的一半将有
z > 0（在屏幕前面），一半将有z < 0（屏幕后面）。如果
z == 0处还有其他图层，它们将覆盖 UILabel 的zz0 一半。尝试增加标签图层的
zPosition。X axis? That means during the rotation half of the UILabel will have
z > 0(in front of the screen) and half will havez < 0(behind the screen).If there's other layers at
z == 0they will cover your UILabel'sz < 0half.Try to increase your label's layer's
zPosition.