Call a function once from OnGUI

Questions & Answers
1

I got a function that I want to call just once from OnGUI. There’re some IF, and if some condition is match, I need to call the Exit() function, that shows a GUI.Label, waits 2 secconds, and then exits. The thing is that the function is not called once, but each time OnGUI is executed. How can I solve this?

2

Declare a variable runonce=0;

inside OnGUI()

if(functionShouldBeCalled==1 && runonce==0) {
runYourFunc();
runonce=1;
}
if( functionNeedsToBeCalledAgain==1) {
functionShouldBeCalled=1;
runonce=0;            //this will run your desired function once in next frame
}

}
3

You can use a state machine.

private enum State { Start, Update }
private State state;

void OnGUI() { 
		switch (state) {
		case State.Start:
			Debug.Log ("run once");

			state = State.Update;
			break;

		case State.Update: 
			Debug.Log ("run every frame");

			break;
		}
	}

	void OnFocus() { 
		state = State.Start;
	}

I’m going to try to use this to load and save xml file data. I would assume that one doesn’t want to load an xml file (or any data file for that matter) every frame.