Challenge 4: UI button

Write a UI script that calls Debug.Log when a button is clicked.

UI Button and onClick Event

In the Unity UI system, the Button component captures user interaction. Methods to invoke upon clicking are dynamically attached using button.onClick.AddListener(Task). This keeps UI code clean and decoupled.

Button button = GetComponent<Button>();
button.onClick.AddListener(StartGame);

Exercise Attach Button Listener

Attach the listener using buton.onClick.AddListener(Tiklandi); and trigger it with buton.Click();.

Show example solution

using System;

public class Button
{
    public Action onClickAction;
    public void AddListener(Action action) { onClickAction += action; }
    public void Click() { onClickAction?.Invoke(); }
    public Button onClick => this;
}

public static class Debug
{
    public static void Log(object message) => Console.WriteLine(message);
}

public class Program
{
    public static void Tiklandi()
    {
        Debug.Log("Butona basildi");
    }

    public static void Main()
    {
        Button buton = new Button();
        buton.onClick.AddListener(Tiklandi);
        buton.Click();
    }
}

Exercise Start Game via Button

Assign baslatButonu.action = () => Debug.Log("Oyun Basladi"); and trigger the action with baslatButonu.Click();.

Show example solution

using System;

public class Button
{
    public Action action;
    public void Click() { action?.Invoke(); }
}

public static class Debug
{
    public static void Log(object message) => Console.WriteLine(message);
}

public class Program
{
    public static void Main()
    {
        Button baslatButonu = new Button();
        baslatButonu.action = () => Debug.Log("Oyun Basladi");
        baslatButonu.Click();
    }
}

Test yourself

Which syntax is used in Unity through code to attach a listener method to a UI Button click event?
- button.onClick.AddListener(Dinleyici);
- button.AddTrigger(Dinleyici);
- button.onPress += Dinleyici;
- button.ClickEvent.Subscribe(Dinleyici);
Show answer

button.onClick.AddListener(Dinleyici); — In Unity, onClick.AddListener() is used to register listeners to a UI button's UnityEvent.

Button Click Listener

baslatButonu.onClick.____(OyunuBaslat);

Show answer

baslatButonu.onClick.AddListener(OyunuBaslat);

UI Interaction Terminology

Button

UI component detecting user clicks
onClick

UnityEvent triggered on button click
AddListener

Registers method to run on event
RemoveListener

Removes previously added listener

Next lesson: Challenge 5: Final synthesis

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