Issues with fullscreen in unity

Question

I'm making a simple menu in Unity 2D. I created a toggle that actives the full screen option. At this point, everything is alright. Then, I wanted to do the same, but pressing the F11 key. Here starts the problem. When I press F11, the screen becomes in fullsize, but the toggle doesn't activates and vice versa. So, I wanted to create a C# script that checks if Screen.fullscreen is true, it activates the toggle, and if it's false, it deactivates it. I thonk that this will solve the problem, but no. When I try to press F11 or click on the toggle, the entire window goes crazy. I don't know how to explain it, but the window will start to shake on its own. I would appreciate if somebody helps me, thank you!

The code of the toggle is this:

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

public class ToggleScreen : MonoBehaviour
{
    public void togglescreen()
    {
        if(Screen.fullScreen == true)
        {
            Screen.fullScreen = false;
        }

        else
        {
            Screen.fullScreen = true;
        }
    }
}

The code of the F11 key is this:

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

public class FullScreenMode : MonoBehaviour
{
    void Update()
    {

        if (Input.GetKeyDown(KeyCode.F11))
        {
            if (Screen.fullScreen == true)
            {
                Screen.fullScreen = false;
            }
            else
            {
                Screen.fullScreen = true;
            }
        }


    }
}

And the code of the activate and deactivate is this:

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

public class ChangeValue : MonoBehaviour
{
    private Toggle onOffSwitch;

    private void Awake()
    {
        onOffSwitch = GetComponent<Toggle>();
    }

    private void Update()
    {
        //onOffSwitch.isOn = Screen.fullScreen;
        if(Screen.fullScreen == true)
        {
            onOffSwitch.isOn = true;
        }
        else
        {
            onOffSwitch.isOn = false;
        }
    }
}

Answer 1

public class Toggler
{

bool state = false;

public void ToggleState()
{

    state = !state; // This sets a Boolean value to the opposite of itself

    if (state)
    {

        // State was just toggled on

    }else{

        // State was just toggled off

    }

}

}

Answer 2

You are repeating the fullScreen logic in the ToggleScreen script and the FullScreenMode script. I would combine these (and simplify them) into a ScreenManager class:

using UnityEngine;

public class ScreenManager : MonoBehaviour
{
    Toggle onOffSwitch;

    void Start()
    {
        // Don't forget to attach the Toggle component to this game object
        onOffSwitch = GetComponent<Toggle>(); 

        // Subscribe to onOffSwitch's onValueChanged event handler
        onOffSwitch.onValueChanged.AddListener(delegate 
        {
            // delegate method to call when onOffSwitch.onValueChanged is raised.
            ToggleValueChanged(onOffSwitch); 
        });
    }

    public static void ToggleFullScreen(bool updateToggleUI)
    { 
        var toggledValue = !Screen.fullScreen;
        Screen.fullScreen = toggledValue;
        onOffSwitch.isOn = updateToggleUI ? toggledValue : onOffSwitch.isOn;
    }

    void ToggleValueChanged(Toggle change)
    {
        // The toggle was already changed via the UI, don't flip it back
        ToggleFullScreen(false); 
    }
}

Then, simply call ScreenManager.ToggleFullScreen() in the FullScreenMode script's Update() method:

using UnityEngine;

public class FullScreenMode : MonoBehaviour
{
    // Don't forget to drag the ScreenManager instance to this reference in the inspector
    [Serializable]
    ScreenManager _screenManager;

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.F11))
        {
            // Change the Toggle UI since this was triggered with F11
            _screenManager.ToggleFullScreen(true);
        }
    }
}