RequireComponent 需要组件

# RequireComponent 需要组件

Inherits from Attribute

The RequireComponent attribute lets automatically add required component as a
dependency.

RequireComponent 属性可以允许自动添加需要的组件作为一个附属。

When you add a script which uses RequireComponent, the required component
will automatically be added to the game object. This is useful to avoid setup
errors. For example a script might require that a rigid body is always added to
the same game object. Using RequireComponent this will be done automatically,
thus you can never get the setup wrong.

当你添加的一个用了 RequireComponent 组件的脚本，需要的组件将会自动被添加到 game
object（游戏物体）。这个可以有效的避免组装错误。举个例子一个脚本可能需要刚体总是被添加在相同的 game
object（游戏物体）上。用 RequireComponent 属性的话，这个过程将被自动完成，因此你可以永远不会犯组装错误。

```
// Mark the PlayerScript as requiring a rigidbody in the game object.
// 标记PlayerScript在游戏物体必需一个刚体

@script RequireComponent(Rigidbody)

function FixedUpdate() {
	rigidbody.AddForce(Vector3.up);
}
```

C# Example:

```
[RequireComponent (typeof (Rigidbody))]
class PlayerScript : MonoBehaviour {
	void FixedUpdate() {
		rigidbody.AddForce(Vector3.up);
	}
}
```

### Constructors**构造器**

* [RequireComponent](RequireComponent.RequireComponent.html)
  
  Require a single component
  需要单个组件。