求助大佬！怪物HP为0后不进入死亡动画？

一楼怪兽控制脚本
public class MonsterCtrl : MonoBehaviour {
public enum MonsterState { idle, trace, attack, die };
public MonsterState monsterState = MonsterState.idle;
private Transform monsterTr;
private Transform playerTr;
private NavMeshAgent nvAgent;
private Animator animator;
public float traceDist = 10.0f;
public float attackDist = 2.0f;
private bool isDie = false;
public GameObject bloodEffect;
public GameObject bloodDecal;
private int hp = 100;
// Use this for initialization
void Start () {
monsterTr = this.gameObject.GetComponent<Transform> ();
playerTr = GameObject.FindWithTag ("Player").GetComponent<Transform> ();
nvAgent = this.gameObject.GetComponent<NavMeshAgent> ();
animator = this.gameObject.GetComponent<Animator> ();
nvAgent.destination = playerTr.position;
StartCoroutine (this.CheckMonsterState());
StartCoroutine (this.MonsterAction ());
}
IEnumerator CheckMonsterState()
{
while (!isDie) {
yield return new WaitForSeconds (0.2f);
float dist = Vector3.Distance (playerTr.position, monsterTr.position);
if (dist <= attackDist) {
monsterState = MonsterState.attack;
} else if (dist <= traceDist) {
monsterState = MonsterState.trace;
} else {
monsterState = MonsterState.idle;
}
}
}
IEnumerator MonsterAction()
{
while (!isDie) {
switch (monsterState) {
case MonsterState.idle:
nvAgent.Stop ();
animator.SetBool ("IsTrace", false);
break;
case MonsterState.trace:
nvAgent.destination = playerTr.position;
nvAgent.Resume ();
animator.SetBool ("IsAttack", false);
animator.SetBool ("IsTrace", true);
break;
case MonsterState.attack:
nvAgent.Stop ();
animator.SetBool ("IsAttack", true);
break;
}
yield return null;
}
}
void OnCollisionEnter(Collision coll)
{
if (coll.gameObject.tag == "BULLET") {
CreateBloodEffect (coll.transform.position);
hp -= coll.gameObject.GetComponent<BulletCtrl> ().damage;
Debug.Log ("Monster HP = " + hp.ToString ());
if (hp <= 0)
{
MonsterDie ();
}
Destroy (coll.gameObject);
animator.SetTrigger ("IsHit");
}
}
void MonsterDie()
{
StopAllCoroutines ();
isDie = true;
monsterState = MonsterState.die;
nvAgent.Stop ();
animator.SetTrigger ("IsDie");
gameObject.GetComponentInChildren<CapsuleCollider> ().enabled = false;
foreach (Collider coll in gameObject.GetComponentsInChildren<SphereCollider>()) {
coll.enabled = false;
}
}
void CreateBloodEffect(Vector3 pos)
{
GameObject blood1 = (GameObject)Instantiate (bloodEffect, pos, Quaternion.identity);
Destroy (blood1, 2.0f);
Vector3 decalPos = monsterTr.position + (Vector3.up * 0.05f);
Quaternion decalRot = Quaternion.Euler (90, 0, Random.Range (0, 360));
GameObject blood2 = (GameObject)Instantiate (bloodDecal, decalPos, decalRot);
float scale = Random.Range (1.5f, 3.5f);
blood2.transform.localScale = Vector3.one * scale;
Destroy (blood2, 5.0f);
}
void OnTriggerEnter(Collider coll)
{
Debug.Log (coll.gameObject.tag);
}
void OnPlayerDie()
{
StopAllCoroutines ();
nvAgent.Stop ();
animator.SetTrigger ("IsPlayerDie");
}
}