Set UI Object position by corner and offset in Unity

SetUIPos.cs

using UnityEngine;
using System.Collections;

public class SetUIPos : MonoBehaviour {
    public enum enumCorner { TopLeft, BottomLeft, TopRight, BottomRight };
    public enumCorner coner;
    public int offsetX;
    public int offsetY;

    // Use this for initialization
    void Start () {
        RectTransform rt = this.GetComponent<RectTransform>();

        int xPos = 0;
        int yPos = 0;

        switch( coner)
        {
            case enumCorner.TopLeft:
                {
                    xPos = -1 * Screen.width / 2 + ( (int)rt.sizeDelta.x / 2 + offsetX );
                    yPos = Screen.height / 2 - ( (int)rt.sizeDelta.y / 2 + offsetY );
                    break;
                }
            case enumCorner.BottomLeft:
                {
                    xPos = -1 * Screen.width / 2 + ((int)rt.sizeDelta.x / 2 + offsetX);
                    yPos = -1 * Screen.height / 2 + ((int)rt.sizeDelta.y / 2 + offsetY);
                    break;
                }
            case enumCorner.TopRight:
                {
                    xPos = Screen.width / 2 - ((int)rt.sizeDelta.x / 2 + offsetX);
                    yPos = Screen.height / 2 - ((int)rt.sizeDelta.y / 2 + offsetY);
                    break;
                }
            case enumCorner.BottomRight:
                {
                    xPos = Screen.width / 2 - ((int)rt.sizeDelta.x / 2 + offsetX);
                    yPos = -1 * Screen.height / 2 + ((int)rt.sizeDelta.y / 2 + offsetY);
                    break;
                }
        }

        rt.anchoredPosition = new Vector2((float)xPos, (float)yPos);

    }
	
	// Update is called once per frame
	void Update () {
	
	}
}