Event system for uGUI singletons

FallbackEventSystem.cs

public class FallbackEventSystem : MonoBehaviour
{
    private GameObject _fallbackEventSystem;

    private void Awake()
    {
        CreateFallbackEventSystem();
    }

    private void OnEnable()
    {
        // If Event System doesn't exist in the scene
        // Activate the fallback event system
        _fallbackEventSystem.SetActive(EventSystem.current == null);
    }

    private void OnDisable()
    {
        _fallbackEventSystem.SetActive(false);
    }

    private void CreateFallbackEventSystem()
    {
        _fallbackEventSystem =
            new GameObject("Fallback Event System", typeof(EventSystem), typeof(StandaloneInputModule));
        _fallbackEventSystem.transform.SetParent(transform);
        _fallbackEventSystem.SetActive(false);
    }
}