Unity正交模式摄像机与屏幕适配的方法

public class CameraAuto : MonoBehaviour {

    float fDefaultRatio = 720.0f / 1280.0f;//预先设定屏幕大小1280*720
    // Use this for initialization
    void Start () {

        float fRatio = (float)Screen.width / Screen.height;
        Camera.main.orthographicSize = Camera.main.orthographicSize* fRatio * fDefaultRatio;

    }
}