Unity3D初学者RestartButton。 在场景之间共享信息？

Question

I want a restart menu that works for all my levels, as I load level 1 there is this script setting an integer to 1 on an empty game object.

using UnityEngine;
using System.Collections;

public class SetRestart : MonoBehaviour {

    public int Setrestart = 1;

    void awake ()
    {
        DontDestroyOnLoad (this);
    }
   }

When you fail the level you get to the next scene called: LostMenu. You have the option to restart that level you were playing or quit. So here I made a button to restart and attached this script to it:

using UnityEngine;
using System.Collections;

public class RestartButton : MonoBehaviour 
{
    public int Setrestart;

    void Start()
    {
        if (Setrestart == 1) {
            Application.LoadLevel("Main");
        }
    }
 }

(Plan is to make 50 levels and also 50 if statements, this is just the first one for the first level called "Main", every level will have its own number). The problem is that nothing happens when I click on the button (Screenshot: http://prntscr.com/9tf4dd ) and that when I load the LostMenu screen nothing happens to the int and it stays at 0 in the inspector while in the level scene called: "Main" I said to it to give it 'int = 1.' The number 1 stays in the "Main" scene and doesn't go to the menu scene.

Level 1 is scene: "Main".

The menu to restart when you lose is scene: "LostMenu".

Am I clear? Sorry for my bad English and thank you in advance.

Answer 1

I use a static 'Globals' class to persist data between scenes in Unity.

You could use something like this to store the name of the last level that you played.

public static class Globals
{
    public static string LastLevel {get; set;}
}

Then you could just write to this string at the start of your level and read it in your restart button handler.

Answer 2

In order for RestartButton to know about the Setrestart value stored in SetRestart you need to have a reference to the GO with the SetRestart component. Right now RestartButton is checking its own Setrestart value, which defaults to 0. This is why it doesn't work.

Instead you need this:

public class RestartButton : MonoBehaviour 
{
    GameObject persistentObject;

    void Start()
    {
        persistentObject = GameObject.Find("NameOfGameObject");
        int shouldReset = (persistentObject.GetComponent<SetRestart>() as SetRestart).Setrestart;
        if (shouldReset == 1) {
            Application.LoadLevel("Main");
        }
    }
 }

GameObject.Find isn't great, performance wise, but for a once-off lookup, it's fine. There are also other ways of getting the reference, but in the case of objects that persist across scene changes, this is the only way (note that I'm saving the GameObject reference to a field, while not neccessary here it is good practice so you aren't GO.Find()ing all the time).