garden_client/Assets/Script/Tool/ScreenAdapt.cs

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

public class ScreenAdapt : MonoBehaviour
{
    public Camera cam;
    public CanvasScaler scaler;

    public void AdaptScreen()
    {
        if (Application.isEditor)
        {
            return;
        }

        AdaptScreen(Screen.width, Screen.height);

        //AdaptScreen(1900, 900);
    }

    public void AdaptScreen(float sceenWidth, float screenHeight)
    {
        float refeRatio = scaler.referenceResolution.y/scaler.referenceResolution.x;
        float deviceRatio = screenHeight/sceenWidth;

        if (refeRatio < deviceRatio)
        {
            Rect rect = new Rect();

            rect.width = 1;
            rect.x = 0;

            rect.height = refeRatio/deviceRatio;
            rect.y = (1 - rect.height)/2;

            cam.rect = rect;

            scaler.matchWidthOrHeight = 0;
        }
        else if (refeRatio > deviceRatio)
        {
            Rect rect = new Rect();

            refeRatio = scaler.referenceResolution.x/scaler.referenceResolution.y;
            deviceRatio = sceenWidth/screenHeight;

            rect.width = refeRatio/deviceRatio;
            rect.x = (1 - rect.width)/2;

            rect.height = 1;
            rect.y = 0;

            cam.rect = rect;

            scaler.matchWidthOrHeight = 1;
        }
    }
}