C# 事件event

public class AAA: MonoBehaviour {

    public delegate void PlayEndDelegate();
    //此處可以使用內置的Action或Func委托簡化，
    //具體參考 https://www.cnblogs.com/kingBook/p/5383415.html
    public event PlayEndDelegate playEndEvent;

    private void playEndHandler(){
        playEndEvent();
        //判斷是否為null
        //if(playEndEvent!=null)playEndEvent();
        //判斷是否為null,還可以簡化
        //playEndEvent?.Invoke();
    }

}

public class BBB: MonoBehaviour {
    private AAA _aaa;
    void Start () {
        _aaa=new AAA();
        _aaa.playEndEvent+=onPlayEndHandler;//添加偵聽
        _aaa.playEndHandler();
    }

    private void onPlayEndHandler(){
        Debug.Log("bbb onPlayEndHandler");
    }
    
    void OnDestroy(){
        _aaa.playEndEvent-=playEndHandler;//移除偵聽
    }
}
//output: bbb onPlayEndHandler