协程介绍
Unity的协程系统是基于C#的一个简单而强大的接口 ,IEnumerator,它允许你为自己的集合类型编写枚举器。
yield return是“停止执行方法,并且在下一帧从这里重新开始”。
简单计时器实例:StartCoroutine()并没有给它传入参数,但是这个方法调用了它自己(这是通过传递CoroutineMethod的return返回值来实现的)
// Use this for initialization void Start () { StartCoroutine(CoroutineMethod()); } IEnumerator CoroutineMethod () { for (float timer = 3; timer >= 0; timer -= Time.deltaTime) { yield return 0; } Debug.Log ("This message appears after 3 seconds!"); }
hello实例:
//This will say hello 5 times, once each frame for 5 frames IEnumerator SayHelloFiveTimes () { yield return 0; Debug.Log ("Hello"); yield return 0; Debug.Log ("Hello"); yield return 0; Debug.Log ("Hello"); yield return 0; Debug.Log ("Hello"); yield return 0; Debug.Log ("Hello"); } //This will do the exact same thing as the above function! IEnumerator SayHello5Times () { for (int i = 0; i < 5; i++) { Debug.Log ("Hello"); yield return 0; } }
开始和终止协程
//If you start a Coroutine by name... StartCoroutine("FirstTimer"); StartCoroutine("SecondTimer"); //You can stop it anytime by name! StopCoroutine("FirstTimer"); //You can stop all anytime! StopAllCoroutines ();