onGui - GUI.Button hits multiple times

Hey!
Sorry, I am quite new and have a problem I am too stupid to solve.

in onGUI i have a button which uses "Instantiate" to spawn an object.
While it works perfectly fine within the unity editor when I build the project and click the same button it causes multiple objects to spawn.

I assume it is because onGUI is called multiple times per frame and the "if (GUI.Button...) remains 'true', causing "Instantiate" to be called more than once.

How would I prevent this?

Code (CSharp):

1.  
2. void OnGUI ()
3. {
4.     //stuff
5.     if (GUI.Button (new Rect (20, 75, 100, 30), "Singleplayer"))
6.     {
7.         Vector3 spawnpos = new Vector3(250f, 5f, 250f);
8.         Instantiate(PlayerStartMeUp,spawnpos,Quaternion.identity);
9.     }
10.     //also stuff
11. }
12.  

Sorry, my english isn't too good.

 

That's only the case for GUI.RepeatButton. GUI.Button returns true just once, and can only be true again when the mouse button is pressed and released again. Maybe you have the same script attached to multiple objects?

--Eric

 

Thank you for answering.
I considered your idea but it is not the case. The script is only in one object. It also works perfectly fine in the Unity Editor. (If I run the project in there). Only when I build the project and run the .exe file the problem occurs.

But if you say GUI.Button is only true once per click then I have no clue what the cause is.

I had the idea because this is also the case with another function such as rotating an object by 90 degrees 'per click'. It is turned 180 degrees most of the time as if the mouse is clicked twice. But I assume this is a different story then (since it's not GUI.Button but GetButtonDown).

Code (CSharp):

1.            
2. if (Input.GetButtonDown ("Fire2"))
3. {
4.       MyCurConstruction.transform.Rotate(0,45,0);
5.       Vector3 vecRound = MyCurConstruction.transform.eulerAngles;
6.       vecRound.y = Mathf.Round(vecRound.y);
7.      MyCurConstruction.transform.eulerAngles = vecRound;
8. }
9.  

 

Okay, I think I am an idiot.
The problem was that I had no camera in place and it simply looked like the UI hat multiple UI elements placed above each other. Once I added a camera it didn't seem to happen anymore.
I was not aware that the UI behaves that way but I guess it makes sense...

Thanks for pointing me to the right door. I was stuck at trying to figure out why the button would be 'clicked' multiple times while it actually didn't really happen. Also, sorry for the stupid question. I'll be back with more later...