c# - 在不同情况下从更新中仅调用一次函数

Question

我已经知道如何从 Update() 中只调用一次函数

void Update(){
    if(x == "blah" && once == true)
    {
        //call a function here
       once = false;
    }
}

但是我怎样才能多次这样做呢？

我有一个敌人(boss)，我想在他的生命值达到 0.75、0.5、0.25 时调用一个方法(但每次只能调用一次)。

顺便说一句，这是我的代码:

//In the update method :

if (health <= StartHealth * 0.75)
{
    Escape();
}
// in the function being called :

else if(health<= StartHealth * 0.75f && health > StartHealth * 0.5f)
{
    for(int i = 0; i<2; i++)
    {
        GameObject x = Instantiate(clone, clonePointz[i].position, Quaternion.identity) as GameObject;
    }
}

else if(health <= StartHealth * 0.5f && health > StartHealth * 0.25f)
{
    for (int i = 0; i < 4; i++)
    {
        GameObject x = Instantiate(clone, clonePointz[Random.Range(0, 2)].position, Quaternion.identity) as GameObject;
    }
}

else if(health<= 0.25f * StartHealth)
{
    for (int i = 0; i < 6; i++)
    {
        GameObject x = Instantiate(clone, clonePointz[Random.Range(0, 2)].position, Quaternion.identity) as GameObject;
    }
}

Answer 1

我现在手边没有 Unity，但这里有一个 C# 小程序，它应该可以执行您想要的操作并模拟引擎的 Update 调用。

它会记住上次调用 Update 时的健康值，并且只会在老板的健康值在两次 Update 通话。

void Main()
{
    var boss = new BossBehaviour();
    boss.Damage(0.1f);
    boss.Update();
    boss.Damage(0.3f);
    boss.Update();
    boss.Damage(0.15f);
    boss.Update();
    boss.Update();
    boss.Damage(0.4f);
    boss.Update();
}

class BossBehaviour {

    float _currentHealth = 1.0f;
    float _healthFromLastUpdate = 1.0f;

    public void Update(){
        Console.WriteLine("Updating. Current health: {0}", _currentHealth);

        if (WasThresholdPassed(0.75f)){
            SpawnMinions();
        }

        if (WasThresholdPassed(0.5f)) {
            SpawnMinions();
        }

        if (WasThresholdPassed(0.25f)) {
            SpawnMinions();
        }

        _healthFromLastUpdate = _currentHealth;
    }

    bool WasThresholdPassed(float threshold) {
        if (_healthFromLastUpdate < threshold) 
            return false;
        if (_currentHealth < threshold)
            return true;
        return false;
    }

    void SpawnMinions() {
        /* ... */
        Console.WriteLine("> Spawning minions. Current health: {0}", _currentHealth);
    }

    public void Damage(float percentDamage) {
        _currentHealth -= percentDamage;
    }

}

这是它的输出:

Updating. Current health: 0,9
Updating. Current health: 0,6
> Spawning minions. Current health: 0,6
Updating. Current health: 0,45
> Spawning minions. Current health: 0,45
Updating. Current health: 0,45
Updating. Current health: 0,04999995
> Spawning minions. Current health: 0,04999995