Function Update in Unity5 doesn't receive variable's value after function Start

Question

I am using Unity 5. The set up is the following:

A camera.
A 3D plane and a canvas with 3 UI Buttons.
A Script in c# attached to the camera. Such script contains only 2 functions: Start() and Update().

Here is the script:

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class ChangeButtonsText : MonoBehaviour {

    public GameObject Menu;

    private Transform[] transforms;
    private List<string> texts;
    private int numButtons;
    private int menuIndex;

    // Use this for initialization
    void Start () {
        texts = new List<string> ();
        for (int i = 0; i < 10; i++) {
            texts.Add("I am the button number " + i.ToString());
        }
        int numButtons = Menu.transform.childCount;
        print ("1 numButtons = " + numButtons.ToString ());
        transforms = new Transform[numButtons];
        for (int i = 0; i < numButtons; ++i) {
            transforms[i] = Menu.transform.GetChild(i);
        }
        print ("2 numButtons = " + numButtons.ToString ());

        menuIndex = 0;
        for (int i = 0; i < numButtons; i++) {
            transforms[i].GetComponentInChildren<UnityEngine.UI.Text>().text = texts[menuIndex];
            if((i < numButtons-1) && (menuIndex < texts.Count - 1)) menuIndex++;
        }
        print ("3 numButtons = " + numButtons.ToString ());


    }

    // Update is called once per frame
    void Update () {
        print ("4 numButtons = " + numButtons.ToString ());

        if(Input.GetKeyDown(KeyCode.Q)) {
            print ("5 numButtons = " + numButtons.ToString ());

            if (menuIndex < texts.Count - 1) menuIndex++;
            print (menuIndex.ToString());
            int j = 0;
            print ("6 numButtons = " + numButtons.ToString ());
            print ("Going in!");
            for (int i = 0; i < numButtons; i++) {
                print ("I'm in!");
                transforms[i].GetComponentInChildren<UnityEngine.UI.Text>().text = texts[menuIndex-j];
                print ("Changed!");
                j++;
            }
        }
    }
}

The 3 firsts prints regarding numButtons show 3. However, the 4th print (the first on in the Update() function prints a 0. Any idea why is this happening?

Thank you very much.

Mephy · Accepted Answer · 2015-10-29 00:08:06Z

4

Inside your Start() method, you're declaring a new variable called numButtons, hiding the instance member with the same name. To fix it, simply remove the int before it, then it will assign the member and not the local variable:

for (int i = 0; i < 10; i++) {
    texts.Add("I am the button number " + i.ToString());
}
numButtons = Menu.transform.childCount; // no "int" here
print ("1 numButtons = " + numButtons.ToString ());

answered Oct 29, 2015 at 0:08

Mephy

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1 Comment

chopeds Over a year ago

Oh... I cannot believe I did that mistake. Maybe I was too sleepy hahah Okay, thank you very much!

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