foreach语句无法遍历UnityEngine.GameObject类型的变量

Question

So as title says, this is my problem. I tried 2 different ways of solving it:

First is with this code:

var children = GetComponentInChildren<GameObject>();
foreach(var child in children)
{
    if(child.name == "HealthBar")
    {
        HealthBar = child;
    }
}

Which gives me Unknown Resolve Error on var inside foreach loop.

Second is this:

var children = GetComponentInChildren<GameObject>();
foreach(GameObject child in children)
{
    if(child.name == "HealthBar")
    {
        HealthBar = child;
    }
}

Which gives me error in the title.

What should i do? Everywhere i looked how to get object inside object by name, everywhere is done by first example.

Answer 1

What you want is the Transform component, not the GameObject type (which is not a component by the way). Moreover, as @Keith Nesbitt indicated, mind the s at GetComponentsInChildren

var children = GetComponentsInChildren<Transform>();
foreach(var child in children)
{
    if(child.name == "HealthBar")
    {
        HealthBar = child;
    }
}

An extension method you could try :

public static void Traverse( this GameObject gameobject, System.Action<GameObject> callback )
{
    Transform transform = gameobject.transform;
    for ( int childIndex = 0 ; childIndex < transform.childCount ; ++childIndex )
    {
        GameObject child = transform.GetChild( childIndex ).gameObject;
        child.Traverse( callback );
        callback( child );
    }
}

// ...

gameObject.Traverse( ( go ) =>
{
    if(go.name == "HealthBar")
    {
        HealthBar = go ;
    }
} ) ;

Answer 2

GetComponentInChildren<T>()仅返回单个结果，而您想要的是GetComponentsInChildren<T>() ，它返回所有给定类型。

Answer 3

foreach only works on things that implement IEnumerator or IEnumberable .

GetComponentInChildren<T>() returns a single T , in your example you pass in GameObject as the T , however GameObject is not something you can iterate over (ie it does not implement IEnumerator or IEnumberable according to the docs ).

Perhaps you meant to pass something different into GetComponentInChildren<T>() ? I am not too familiar with Unity or what you are trying to accomplish, but GameObject does have a method called GetComponentsInChildren<T>() (note the plural in the name), maybe that's what you are looking for?