UnassignedReferenceException: The variable controller of PlayerMove has not been assigned. You probably need to assign the controller variable of the PlayerMove script in the inspector. PlayerMove.Update () (at Assets/scripts/PlayerMove.cs:21)

在 Unity 中遇到 `UnassignedReferenceException` 错误通常是因为脚本尝试访问了一个未被赋值的对象或组件。对于 `PlayerMove` 脚本中的 `controller` 变量未分配的情况，以下是可能的原因以及解决方案。 ### 问题原因当 `controller` 是一个 `CharacterController` 类型的变量时，如果它没有通过 Inspector 或代码显式赋值，则会在运行时抛出 `UnassignedReferenceException` 错误[^3]。这可能是由于以下原因之一： - 在 Inspector 中忘记手动拖拽 `CharacterController` 组件到对应的字段上。 - 使用了 `GetComponent<CharacterController>()` 方法但在对象初始化之前调用了该方法。 - 对象层次结构发生变化，导致原本绑定的 `CharacterController` 不再有效。 ### 解决方案 #### 方案一：通过Inspector手动设置确保在 Unity 的 Hierarchy 面板中选中带有 `PlayerMove` 脚本的游戏对象，并将其关联的 `CharacterController` 拖放到 `PlayerMove` 脚本下的 `controller` 字段中[^2]。 #### 方案二：自动获取Component 可以在脚本中使用 `Start()` 函数来动态查找并赋值 `CharacterController`： ```csharp private CharacterController controller; void Start() { controller = GetComponent<CharacterController>(); if (controller == null) { Debug.LogError("CharacterController not found on this GameObject!"); } } ``` 此代码片段会检查当前游戏对象是否有附加的 `CharacterController`，如果没有找到则记录一条错误日志以便调试。 #### 方案三：验证GameObject配置确认 `CharacterController` 已经正确添加到了玩家模型所在的 Game Object 上。可以通过右键点击场景视图或者选择目标物体后，在 Component 列表里寻找是否存在 `CharacterController` 来完成这一操作[^1]。 #### 注意事项为了避免潜在的问题发生，请始终遵循良好的编程实践，比如对任何外部依赖项都应有相应的空指针检测逻辑[^4]。 ```csharp if(controller != null){ // 正常执行涉及controller的操作 }else{ Debug.LogWarning("Controller is missing, please assign it."); } ``` 以上措施能够帮助开发者快速定位并修复由 `UnassignedReferenceException` 引发的相关异常情况。 ###

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UnassignedReferenceException: The variable controller of PlayerMove has not been assigned. You probably need to assign the controller variable of the PlayerMove script in the inspector. PlayerMove.Update () (at Assets/scripts/PlayerMove.cs:21)

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