Unity/端末サイズ

サンプル

void Awake()
{
       TermSize.orthographicSizeAuto();
}

TermSize.cs

public class TermSize {
   public static void orthographicSizeAuto () {
       // 縦画面 iPhone6
       float developAspect = 750.0f / 1334.0f;
       // 横画面
       float developAspect = 1334.0f / 750.0f;
       float deviceAspect = (float)Screen.width / (float)Screen.height;
       float scale = deviceAspect / developAspect;
       Camera mainCamera = Camera.main;
       float deviceSize = mainCamera.orthographicSize;
       float deviceScale = 1.0f / scale;
       if (scale > 1) {
           Debug.Log("scale変更不要");
           return;
       }
       mainCamera.orthographicSize = deviceSize * deviceScale;
    }
}

参考：http://www.project-unknown.jp/entry/2017/01/05/212837