To be honest based on the documentation I cannot tell but should GetComponent<T>() search all objects in the scene for the component? I have a pub/sub setup and have various EmptyObjects in a scene named <name>Publisher ie WorldPublisher \ PlayerPublisher where I can attach various needed publishers.
My idea was that I could call GetComponent<KeyBindingPublisher>() and that would give back that script. However, I am getting a null so it cannot seem to find it from say the player GameObject.
I do not want to attach both pub/sub to the player GameObject that feels too tightly coupled.
I am currently doing this:
GameObject playerEvents = GameObject.Find("PlayerPublishers");
KeyBindingPublisher keyBindingPublisher = playerEvents.GetComponent<KeyBindingPublisher>();
Which does appear to work but that seems to tightly couple the subscriber script and UI which I was trying to avoid. I might not need to put a PlayerPublishers object so just want to be able to get a ref to the script without knowing all the objects.
CodePudding user response：
When you call GameObject.GetComponent, that will search for a matching component attached to the specific GameObject that you call it on. If you want to include other GameObjects in the search, you have a few options:
GameObject.GetComponentInChildrenwill search that GameObject and all of its children.GameObject.GetComponentInParentwill search that GameObject and all of its parents.Object.FindObjectOfTypewill search all loaded Unity objects.
If you are searching for multiple objects, there are similar functions that return arrays of matches.
As you might imagine, casting a wide net can have an impact on performance. Searching the entire scene is ideally something that should be kept to a minimum.
If you are looking for exactly one instance of a KeyBindingPublisher that other scripts can reference across all scenes, you might look into a design pattern called a singleton. Here is an example from GameDev Stack Exchange that includes some code samples for achieving this in Unity3D.