StatusOverlay.cs

using UnityEngine;
using UnityEngine.UI;

public enum StatusOverlayState
{
    Hidden,
    ShowingStatus,
    ShowingError
}

public class StatusOverlay : MonoBehaviour
{
    public static bool IsVisible
    {
        get { return _instance._state != StatusOverlayState.Hidden; }
    }

    public static string Text
    {
        get { return _instance._text; }
        set
        {
            _instance._text = value;
            _instance._textElement.text = _instance._text;
        }
    }

    public static StatusOverlayState State
    {
        get { return _instance._state; }
    }

    static StatusOverlay _instance;

    StatusOverlayState _state;
    string _text;
    Text _textElement;
    MaskableGraphic[] _renderers;

    void Awake ()
    {
        _instance = this;
        _textElement = GetComponentInChildren<Text>();
        _renderers = GetComponentsInChildren<MaskableGraphic>();
        _state = StatusOverlayState.Hidden;
    }

    public static void ShowStatus (string status)
    {
        Text = status;
        _instance._state = StatusOverlayState.ShowingStatus;
        _instance.SetRenderersEnabled(true);
    }

    public static void ShowError (string error)
    {
        Text = error;
        _instance._state = StatusOverlayState.ShowingError;
        _instance.SetRenderersEnabled(true);
    }

    public static void Hide ()
    {
        Text = null;
        _instance._state = StatusOverlayState.Hidden;
        _instance.SetRenderersEnabled(false);
    }

    void SetRenderersEnabled (bool enabled)
    {
        for (int i = 0; i < _renderers.Length; i++)
        {
            _renderers[i].enabled = enabled;
        }
    }

    void Update ()
    {
        if (_state == StatusOverlayState.ShowingError)
        {
            if (Controls.GetActionDown(ControlsAction.Primary))
                Hide();
        }
    }
}