Using GUI and check what button was pressed

Question

I tried using a premade button from Unity and refer to a function in a script of a different gameobject (using the Unity tutorial for GUI)

I gave each button it's own specific name. But when I click the button it tells me: Object reference not set to an instance of an object.

Here is the script. the button refers to function BuildChoice:

 public class BuildingManager : MonoBehaviour {
 public GameObject activeBuilding;
 public GameObject[] buildings;

 void Update () {

 }

 public void BuildChoice(GameObject btnObj)
 {
     string btnName = btnObj.name;    **<---- Here is the error**

     if (btnName == "Btn_Floor") 
     {
         Debug.Log("Hit button Btn_Floor");
                     activeBuilding = buildings[0];

     }

             if (btnName == "Btn_Wall") 
     {
         Debug.Log("Hit button Btn_Wall");
                     activeBuilding = buildings[1];
     }
 }

I don't want to have a function for every single button. I could always do that but thought that t$$anonymous$$s might be a good way.

In the end I want to have each button represent a gameobject in an Array and have that gameobject in the array be active. The player can then place t$$anonymous$$s gameobject on the map as part of a building game.

Answer 1

Best Answer

Answer by Worempie · Feb 05, 2015 at 06:18 PM

Instead of Using a custom GUI I manually added the buttons. AS fafase said. You can also create a method for every single button that you have.

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Mmmpies · Feb 05, 2015 at 09:32 PM 0

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I appreciate this is answered, although as you did what @fafase suggested it might have been nice to ask them to make their comment an answer to credit them. Hey just a thought not trying to accuse you of anything :¬)

You could also try lambdas or delegates. Here's an example of a lambda:

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 
 public class LambdaButtons : MonoBehaviour {
 
     public GameObject prefabButton;
     public RectTransform ParentPanel;
     
     void Start () {
 
         for(int i = 0; i < 5; i++)
         {
             GameObject goButton = (GameObject)Instantiate(prefabButton);
             goButton.transform.SetParent(ParentPanel, false);
             goButton.transform.localScale = new Vector3(1, 1, 1);
 
             goButton.GetComponentInChildren<Text>().text = "Button " + i.ToString ();
 
             Button tempButton = goButton.GetComponent<Button>();
             int tempInt = i;
 
             tempButton.onClick.AddListener(() => ButtonClicked(tempInt));
         }
     }
 
     void ButtonClicked(int buttonNo)
     {
         Debug.Log ("Button clicked = " + buttonNo);
     }
 }

Worempie · Feb 06, 2015 at 08:56 AM 0

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I was already wondering why I couldn't give any upvotes to comments. Quite new to answers in unity. Thanks for the tip :)

Using GUI and check what button was pressed

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