letterbox like interface in uGUI (screen space)

LetterBoxScreenSpace.cs

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

[RequireComponent(typeof(ReferenceResolution))]
[ExecuteInEditMode]
public class LetterBoxScreenSpace : MonoBehaviour {

	public RectTransform rootRectTransform;

	private ReferenceResolution refreso;
	public ReferenceResolution RefReso
	{
		get{
			if( refreso == null )
				refreso = GetComponent<ReferenceResolution>();

			return refreso;
		}
	}

	float aspect = 0;

	void Start()
	{
		UpdateResolution();
	}

#if UNITY_EDITOR
	void Update () 
	{
		if( !UnityEditor.EditorApplication.isPlaying )
		{
			UpdateResolution();
		}
	}
#endif

	void UpdateResolution()
	{
		if( rootRectTransform == null)
		{
			Debug.LogWarning("set root RectTransform");
			return;
		}
		
		var physicalAspect = (float)Screen.height / Screen.width;
		if( aspect == physicalAspect )
			return;
		
		aspect = physicalAspect;
		rootRectTransform.sizeDelta = RefReso.resolution;
		var referenceAspect = (float)RefReso.resolution.y / RefReso.resolution.x;

		RefReso.matchWidthOrHeight = (physicalAspect > referenceAspect)? 0 : 1;
	}

	[ContextMenu("Set Up")]
	void Init()
	{

		var childList = GetComponentsInChildren<RectTransform>();

		if( rootRectTransform != null )
		{
			return;
		}

		var obj = new GameObject("root", typeof(RectTransform));
		var rt = obj.GetComponent<RectTransform>();
		rootRectTransform = rt;
		rt.SetParent(transform);

		rt.transform.localScale = new Vector3(1,1,1);
		rt.anchoredPosition = new Vector2(0,0);

		var currentRectTransform = GetComponent<RectTransform>();

		foreach( var child in childList )
		{
			if( child != currentRectTransform)
				child.SetParent(rt, false);
		}

		UpdateResolution();
	}
}

使い方

Canvasにアタッチしてset upコンテキストを実行する。