Unity 协程

脚本执行顺序根据Unity脚本生命周期yield return每帧执行是在Update函数执行完毕以后如图所示。假设以下测试代码public class ABTest : MonoBehaviour { int count1; int countF1; int countM; // Start is called before the first frame update void Start() { Debug.Log(Start Begin!! TimeSinceStartup: Time.realtimeSinceStartup); StartCoroutine(CountNum()); } private void FixedUpdate() { if(countF8)print($进入FixedUpdate,FixedUpdate{countF},当前时间{Time.realtimeSinceStartup}); } // Update is called once per frame void Update() { if(count8)print($进入Update,fram{count},当前时间{Time.realtimeSinceStartup}); } IEnumerator CountNum() { print(Step1); Debug.Log(${countM}:进入协程函数当前帧为{Time.frameCount},当前时间{Time.realtimeSinceStartup}); yield return new WaitForFixedUpdate(); //yield return null; Debug.Log(${countM}:进入协程函数当前帧为{Time.frameCount},当前时间{Time.realtimeSinceStartup}); print(Step2); yield return new WaitForFixedUpdate(); Debug.Log(${countM}:进入协程函数当前帧为{Time.frameCount},当前时间{Time.realtimeSinceStartup}); print(Step3); yield return null; Debug.Log(${countM}:进入协程函数当前帧为{Time.frameCount},当前时间{Time.realtimeSinceStartup}); print(Step4); print(Step5); } }运行打印结果为输出“Step3”以后遇到yield return null语句挂起程序执行第二帧的Update函数。进入第三帧根据生命周期函数先执行完第三帧Updata函数随后执行yield return null语句后续内容。