В этом уроке туториала хорошо объясняют, как добавить управление с мобильных устройств:
https://unity3d.com/ru/learn/tutorials/projects/2d...
Если еще короче, то, в идеале, при сборке определяете, что за тип сборки (PC, iOS, Android and etc.) и, в зависимости от сборки, определяете управление:
//Check if we are running either in the Unity editor or in a standalone build.
#if UNITY_STANDALONE || UNITY_WEBPLAYER
//Get input from the input manager, round it to an integer and store in horizontal to set x axis move direction
horizontal = (int) (Input.GetAxisRaw ("Horizontal"));
//Get input from the input manager, round it to an integer and store in vertical to set y axis move direction
vertical = (int) (Input.GetAxisRaw ("Vertical"));
//Check if moving horizontally, if so set vertical to zero.
if(horizontal != 0)
{
vertical = 0;
}
//Check if we are running on iOS, Android, Windows Phone 8 or Unity iPhone
#elif UNITY_IOS || UNITY_ANDROID || UNITY_WP8 || UNITY_IPHONE
//Check if Input has registered more than zero touches
if (Input.touchCount > 0)
{
//Store the first touch detected.
Touch myTouch = Input.touches[0];
//Check if the phase of that touch equals Began
if (myTouch.phase == TouchPhase.Began)
{
//If so, set touchOrigin to the position of that touch
touchOrigin = myTouch.position;
}
//If the touch phase is not Began, and instead is equal to Ended and the x of touchOrigin is greater or equal to zero:
else if (myTouch.phase == TouchPhase.Ended && touchOrigin.x >= 0)
{
//Set touchEnd to equal the position of this touch
Vector2 touchEnd = myTouch.position;
//Calculate the difference between the beginning and end of the touch on the x axis.
float x = touchEnd.x - touchOrigin.x;
//Calculate the difference between the beginning and end of the touch on the y axis.
float y = touchEnd.y - touchOrigin.y;
//Set touchOrigin.x to -1 so that our else if statement will evaluate false and not repeat immediately.
touchOrigin.x = -1;
//Check if the difference along the x axis is greater than the difference along the y axis.
if (Mathf.Abs(x) > Mathf.Abs(y))
//If x is greater than zero, set horizontal to 1, otherwise set it to -1
horizontal = x > 0 ? 1 : -1;
else
//If y is greater than zero, set horizontal to 1, otherwise set it to -1
vertical = y > 0 ? 1 : -1;
}
}
#endif //End of mobile platform dependendent compilation section started above with #elif
