SwipeFinger

using UnityEngine;
using System.Collections;

public class SwipeFinger : MonoBehaviour {

    public enum Directions {Up, Down, Left, Right, None}

    [HideInInspector]
    public Directions direction = Directions.None;
    //The min swipe distance to change direction
    public float sensibility = 2.5f;

    //Touch latched finger
    private int latchedFinger = -1;

    void Update () {
        Vector2 deltaPosition = Vector2.zero;

        #if UNITY_EDITOR
        //Get delta position based on mouse move on editor
        if (Input.GetMouseButton (0)) {
            deltaPosition.x = Input.GetAxis ("Mouse X");
            deltaPosition.y = Input.GetAxis ("Mouse Y");
        }

        #elif UNITY_STANDALONE_WIN
        //Same here, but for standalone application
        if (Input.GetMouseButton (0)) {
            deltaPosition.x = Input.GetAxis ("Mouse X");
            deltaPosition.y = Input.GetAxis ("Mouse Y");
        }

        #else
        //And here gets delta position with touch
        foreach (Touch touch in Input.touches) {
            if (latchedFinger == -1 && touch.phase == TouchPhase.Began)
                latchedFinger = touch.fingerId;

            if (latchedFinger == touch.fingerId &&
               (touch.phase == TouchPhase.Ended || touch.phase == TouchPhase.Canceled))
                latchedFinger = -1;

            if (touch.fingerId == latchedFinger && touch.phase == TouchPhase.Moved) {
                deltaPosition = touch.deltaPosition;
            }
        }
        #endif

        //Send delta position to a method to check which way finger was swiped
        SetDirection (deltaPosition);
    }

    void SetDirection (Vector2 deltaPosition) {
        //Check direction based on delta position
        if (deltaPosition.y > sensibility)
            direction = Directions.Up;

        else if (deltaPosition.y < -sensibility)
            direction = Directions.Down;

        else if (deltaPosition.x > sensibility)
            direction = Directions.Right;

        else if (deltaPosition.x < -sensibility)
            direction = Directions.Left;

        else
            direction = Directions.None;
    }
}