Disabling child gameobject from script attached to parent

Questions & Answers
1

Is there any better way to deactivate child gameobjects from a script attached to the parent gameobject?

this.gameObject.transform.Find("ChildToKill").gameObject.SetActive(false);
3

First drop back everything that is implicit. Save yourself some typing.

transform.Find("ChildToKill").gameObject.setActive(false);
2

To disable a child object by its name, i think so.

But its is not the common pattern, we usually use a directly reference setted in editor.

4

This is a simple extension method that does what you want:

public static class GameObjectExtensions
{
		/// <summary>
		/// Gets the child gameObject whose name is specified by 'wanted'
		/// The search is non-recursive by default unless true is passed to 'recursive'
		/// </summary>
		public static GameObject GetChild(this GameObject inside, string wanted, bool recursive = false)
		{
			foreach (Transform child in inside.transform)
			{
				if (child.name == wanted) return child.gameObject;
				if (recursive)
				{
					var within = GetChild(child.gameObject, wanted, true);
					if (within) return within;
				}
			}
			return null;
		}
}

Usage:

gameObject.GetChild("childname").SetActive(false);