Unity 私有唤醒更新和启动方法如何工作？

Question

Unity是如何在后台调用Awake、Update、Start方法的？它们对我来说没有访问修饰符表明它们是私有方法，并且它们不使用任何类似 new 或 override 的东西，那么 Unity 框架如何找到调用它们的方法？

关于相关问题，没有使用虚方法有什么特殊原因吗？

编辑：对于那些不熟悉 Unity 脚本的人，它们通常是这样显示的：

public class MyClass : MonoBehaviour{
   void Start(){
   }

   void Awake(){
   }

   void Update(){
   }
}

我不明白的是框架是如何为每个脚本找到并自动调用这些方法的，而从表面上看，它们看起来只是私有方法

Answer 1

这是Unity blog post

中的一条信息

HOW UPDATE IS CALLED

No, Unity doesn’t use System.Reflection to find a magic method every time it needs to call one.

Instead, the first time a MonoBehaviour of a given type is accessed the underlying script is inspected through scripting runtime (either Mono or IL2CPP) whether it has any magic methods defined and this information is cached. If a MonoBehaviour has a specific method it is added to a proper list, for example if a script has Update method defined it is added to a list of scripts which need to be updated every frame.

During the game Unity just iterates through these lists and executes methods from it — that simple. Also, this is why it doesn’t matter if your Update method is public or private.

Answer 2

方法不是虚拟的是为了性能。如果它是虚拟的，那么每个 MonoBehaviour 都需要调用所有相关方法（Start、Awake、Update、FixedUpdate 等），这是一件坏事。

Unity 私有唤醒更新和启动方法如何工作？

How do the Unity private awake update and start methods work?

c#

design-patterns

unity3d

unity5