控制器中的层。
必须注意,AnimatorControllerLayer 作为副本返回。当发生更改时,应将数组重新设置为该属性。
class ControllerModifier
{
    UnityEditor.Animations.AnimatorController controller;
    public void ModifyLayers(int layerIndex, string newName)
    {
        UnityEditor.Animations.AnimatorControllerLayer[] layers = controller.layers;
        layers[layerIndex].name = newName;
        controller.layers = layers;
    }
}