Unity toggle sprite swap for on-off sprites

01 декабря 2016 в 04:38

Unity default toggle component doesn’t have ability to just toggle two images for on/off state.
So here my simple component to do this. It is based on Unity.UI.Button.

using System;
using UnityEngine;
using UnityEngine.UI;

[RequireComponent(typeof(Button))]
public class ToggleSpriteSwap: MonoBehaviour
{
    [SerializeField] private Image targetImage;

    [SerializeField] private Sprite onSprite;
    [SerializeField] private Sprite offSprite;
    [SerializeField] private bool isOn;

    public bool IsOn { get { return isOn; } set { isOn = value; UpdateValue(); }}
    public event Action<bool> onValueChanged;

    private Button button;

    // to set initial value and skip onValueChanged notification
    public void Initialize(bool value)
    {
        isOn = value;
        UpdateValue(false);
    }

    // Use this for initialization
    void Start ()
    {
        button = GetComponent<Button>();
        button.transition = Selectable.Transition.None;
        button.onClick.AddListener(OnClick);
    }

    void OnClick()
    {
        isOn = !isOn;
        UpdateValue();
    }

    private void UpdateValue(bool notifySubscribers = true)
    {
        if(notifySubscribers && onValueChanged != null)
            onValueChanged(isOn);

        if (targetImage == null)
            return;

        targetImage.sprite = isOn ? onSprite : offSprite;
    }
}

using System;

using UnityEngine;

using UnityEngine.UI;

[RequireComponent(typeof(Button))]

public class ToggleSpriteSwap: MonoBehaviour

{

[SerializeField] private Image targetImage;

[SerializeField] private Sprite onSprite;

[SerializeField] private Sprite offSprite;

[SerializeField] private bool isOn;

public bool IsOn { get { return isOn; } set { isOn = value; UpdateValue(); }}

public event Action<bool> onValueChanged;

private Button button;

// to set initial value and skip onValueChanged notification

public void Initialize(bool value)

{

isOn = value;

UpdateValue(false);

}

// Use this for initialization

void Start ()

{

button = GetComponent<Button>();

button.transition = Selectable.Transition.None;

button.onClick.AddListener(OnClick);

}

void OnClick()

{

isOn = !isOn;

UpdateValue();

}

private void UpdateValue(bool notifySubscribers = true)

{

if(notifySubscribers && onValueChanged != null)

onValueChanged(isOn);

if (targetImage == null)

return;

targetImage.sprite = isOn ? onSprite : offSprite;

}

Feel free to use it, credits will be nice, but not crucial for this simple peace of code.

7 июля, Вторник: Новости игровой индустрии

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Сергей КормишинПишет статьи о разработке игр. Не инди, — работает рендеринг-программистом в крупной ААА студии в Санкт-Петербурге. Большой поклонник игр Naughty Dog.

Unity toggle sprite swap for on-off sprites

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