input on buttons

Hello, someome please help, or i throw my pc through window
Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.UI;
5. 
   
6. public class Controleri : MonoBehaviour
7. {
8. public void SpaceKnopka()
9. {
10. Input.GetKeyDown(KeyCode.Space);
11. }
12. }

i made this code, and i set SpaceKnopka to button onclick, so button had same function as Space on keyboard.
i also tried Input.GetKey(KeyCode.Space); , neither works.

im talking about 2D game kit. i want to add mobile controls. please someone godsend help me , im searching internet for 4 days already how to add inputs on UI buttons.

Code (CSharp):

1. Code (CSharp):

   1. using System.Collections;
   2. [*]using System.Collections.Generic;
   3. [*]using UnityEngine;
   4. [*]using UnityEngine.UI;
   5. [*]
   6.  
   7. [*]public class Controleri : MonoBehaviour
   8. [*]{
   9. [*]   public void SpaceKnopka()
   10. [*]    {
   11. [*]        Debug.Log(Input.GetKeyDown(KeyCode.Space));
   12. [*]    }
   13. [*]}
   14. [/LIST]
   15. This returns FALSE.