モバイル表示でもPCのワイド表示でもちょうど良い感じに表示するためのCanvasScaler

ResponsiveCanvasScaler.cs

using UnityEngine;
using UnityEngine.UI;

/// <summary>
/// PC/モバイル両方にレスポンシブ対応するためのCanvasScaler
/// </summary>
public class ResponsiveCanvasScaler : CanvasScaler
{
    private float _defaultMatchWidthOrHeight;
    private int _cachedWidth;

    protected override void Awake()
    {
        _defaultMatchWidthOrHeight = m_MatchWidthOrHeight;
    }

    private void Update()
    {
        if (!Application.isPlaying)
        {
            return;
        }
        if (_cachedWidth == Screen.width)
        {
            return;
        }
        _cachedWidth = Screen.width;
        var matchWidth = Mathf.Lerp(m_ReferenceResolution.x, m_ReferenceResolution.y, _defaultMatchWidthOrHeight);
        if (_cachedWidth > matchWidth)
        {
            uiScaleMode = _cachedWidth > m_ReferenceResolution.x ?
                ScaleMode.ConstantPixelSize : ScaleMode.ScaleWithScreenSize;
            if (uiScaleMode == ScaleMode.ScaleWithScreenSize)
            {
                m_MatchWidthOrHeight = 
                    Mathf.InverseLerp(m_ReferenceResolution.x, matchWidth, _cachedWidth) * _defaultMatchWidthOrHeight;
            }
        }
        else
        {
            uiScaleMode = ScaleMode.ScaleWithScreenSize;
            m_MatchWidthOrHeight = _defaultMatchWidthOrHeight;
        }
    }
}