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I am a beginner C# coder, and I am trying to make a game in Unity. Hence the question: Can I check if all children of an object are active in a scene? I want to use it to check if all enemies are active.

Alex Myers
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MegaRay_PL
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2 Answers2

4

You could check using:

for (int i = 0; i< gameObject.transform.childCount; i++)
{
    if(!gameoObject.transform.GetChild(i).gameObject.activeInHierarchy)
    {
        return false;
    }
}
return true;

activeInHierarchy is exactly what you need.

derHugo
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Johnny
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2

Extending Johnny's answer

Since Transform implements IEnumerable iteratign through all children you can easier loop using foreach 

foreach(var child in transform) 
{ 
    if(child.gameObject.activeInHierachy) continue;

    return false;
}
return true;

Or using Linq Cast and Linq All

using System.Linq;


bool allActive = transform.Cast<Transform>().All(child => child.activeInHierachy);
derHugo
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  • is using `foreach` for iterating through all children faster or more efficient than `for loop`? – Richard Johnson Oct 21 '22 at 05:35
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    @RichardJohnson afaik it should be about the same .. internally the [`GetEnumerator`](https://github.com/Unity-Technologies/UnityCsReference/blob/73c12b5a403abad9a300f01a81e7aaf30a0d30b5/Runtime/Transform/ScriptBindings/Transform.bindings.cs#L326) also basically uses a self incrementing index and `GetChild` .. it is just way easier to write ;) – derHugo Oct 21 '22 at 05:41