unity3D -- 给游戏体添加组件

一、直接在编辑器Inspector上添加一个组件。

二、在脚本中使用AddComponent函数添加一个组件，例如：

using UnityEngine;using System.Collections;public class Test : MonoBehaviour {    private CanvasGroup m_CanvasGroup;    void Start()    {        m_CanvasGroup = GetComponent<CanvasGroup> ();        if(m_CanvasGroup == null){            gameObject.AddComponent<CanvasGroup> ();            m_CanvasGroup = GetComponent<CanvasGroup> ();        }    }}

官方实例：

    // Adds the sphere collider to the game object    SphereCollider sc = gameObject.AddComponent("SphereCollider") as SphereCollider;public Component AddComponent(Type componentType);

三、利用RequireComponent添加一个组件。

using UnityEngine;using System.Collections;using UnityEngine.UI;[RequireComponent(typeof(CanvasGroup))][RequireComponent(typeof(Image))]public class Test : MonoBehaviour {    private CanvasGroup m_CanvasGroup;    private Image m_Image;    void Start()    {        m_CanvasGroup = GetComponent<CanvasGroup> ();        m_Image = GetComponent<Image> ();    }}

RequireComponent：这个类一定需要哪些组件，如果目前这些组件没有被加上，就自动加上。

官方实例：

using UnityEngine;// The GameObject requires a Rigidbody component[RequireComponent (typeof (Rigidbody))]public class PlayerScript : MonoBehaviour {    Rigidbody rb;    void Start() {        rb = GetComponent<Rigidbody>();    }    void FixedUpdate()  {        rb.AddForce(Vector3.up);    }}public RequireComponent(Type requiredComponent);public RequireComponent(Type requiredComponent, Type requiredComponent2);public RequireComponent(Type requiredComponent, Type requiredComponent2, Type requiredComponent3);

–Rocky