CanvasScaler Orientation Driver - controls the CanvasScaler to simplify portrait / landscape adjustments

CanvasScalerOrientationDriver.cs

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

//	@kurtdekker - to help fitting portrait / landscape UI stuff together
//
//	Put this where the CanvasScaler is.
//
//	You should set CanvasScaler to:
//		ScaleWithScreenSize,
//		MatchWidthOrHeight
//		100% height
//	and author all your UI as above ^ ^ ^
//
//	CAUTION: Takes Control of CanvasScaler! See below for what it does!
//
//	Baselines to a height of 600, keeping that as the
//	scale of the minimum axis (narrowest).
//
//	This means in portrait it would assert 600 width,
//	making the height larger...

public class CanvasScalerOrientationDriver : MonoBehaviour
{
	bool? Landscape;

	const float Baseline = 600;

	void Drive()
	{
		var cs = GetComponent<CanvasScaler>();

		cs.uiScaleMode = CanvasScaler.ScaleMode.ScaleWithScreenSize;
		cs.screenMatchMode = CanvasScaler.ScreenMatchMode.MatchWidthOrHeight;

		float aspect = (float)Screen.width / Screen.height;

		if ((bool)Landscape)
		{
			cs.referenceResolution = new Vector2( aspect * Baseline, Baseline);
			cs.matchWidthOrHeight = 1;
		}
		else
		{
			cs.referenceResolution = new Vector2( Baseline, aspect * Baseline);
			cs.matchWidthOrHeight = 0;
		}
	}

	void Update ()
	{
		bool landscape = Screen.width > Screen.height;

		if (Landscape != landscape)
		{
			Landscape = landscape;

			Drive();
		}
	}
}