无法从C＃中的另一个脚本调用方法？ 使用Unity吗？

Question

Alright, I've asked around on the Unity3d forums with no luck. I'm attempting something pretty simple here and for some reason I can't get one C# script to call a function of another.

I am in Unity here and I have 2 scripts that I'm trying to use to detect a simple tap on a GameObject and do something based on that tap - OnMouseDown has failed me for whatever reason.

I read an article on using a TouchManager script attached to an empty to call a function from the touched object's script, so here is that ; it uses Raycasts and is supposed to get the touched game object and called the Touched() function:

protected virtual void Update () {
    if (Input.touchCount > 1) {

        if (Input.touches [0].phase == TouchPhase.Stationary) {
            Ray ray = Camera.main.ScreenPointToRay (Input.touches [0].position);
            if (Physics.Raycast (ray, out hit, 100.0f)) {
                touchedObject = hit.transform.gameObject; 
                touchedObject.GetComponent<touchableGameObject> ().Touched ();
                print (touchedObject.name);
            } else print ("GetMouseButtonDown on nothing");
        }
    }
}

Without the first if, I was getting an OutofBounds in the Array error. However now with that first if I am getting no results at all.

Then on my enemy prefab (which is clearly an object) I just have:

public void Touched() {
    print ("touched!! WORKING");
}

the function is public so it should be able to be called. I have a print in the Start() method so I know the script is working, yet the Touched() method is never called even when I am clearly touching/clicking on the game object.

Without the first if statement in the Touch Manager script, I would consistently get the last else if printed:

print ("GetMouseButtonDown on nothing");

I am relatively new to Unity and C# and cant figure this out. I need this to work and I'm desperate.

How does one call a function based on touch from another C# script?

Answer 1

This is a very simple mistake.

When there is one touch, Input.touchCount is 1 . When there are 2 , the Input.touchCount value is 2.

The problem with your code is on this line : if (Input.touchCount > 1) {

You are only checking if touch is more than 1 .

You should be checking if touch is more or equals to 1 : if (Input.touchCount >= 1)

OR

If touch is more than 0 : if (Input.touchCount > 0) .

Any one of this should solve your problem.

Finally, it is not guaranteed that the touched GameObject will have the touchableGameObject script attached to it. Because of it this, you must check if GetComponent<touchableGameObject>() is null before calling its Touched() function. Please capitalize the name of your scripts. This will make it easier for you to identify a script and a variable name.

protected virtual void Update()
{
    if (Input.touchCount >= 1)
    {
        if (Input.touches[0].phase == TouchPhase.Stationary)
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.touches[0].position);
            if (Physics.Raycast(ray, out hit, 100.0f))
            {
                touchedObject = hit.transform.gameObject;


                touchableGameObject touchScript = touchedObject.GetComponent<touchableGameObject>();
                if (touchScript != null)
                {
                    touchScript.Touched();
                }

                print(touchedObject.name);
            }
            else
            {
                print("GetMouseButtonDown on nothing");
            }
        }
    }
}