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

  Require a single component
  需要单个组件。