unity3d自定义Toggle组件，解决设置isOn自动调用方

当我们在使用unity自带的Toggle组件的时候，我们是通过Toggle组件上的isOn属性得知是开启我们的功能面板还是关闭，这时候通常我们会给toggle绑定一个方法，当我们点击toggle的时候，调用方法，同时播放点击音效，可是有些时候，需要我们在切换界面的时候通过其它方法来关闭我们的属性isOn为false，方便我们下次点击的时候，isOn为true，这时候，我们单独对toggle的isOn属性赋值时会调用一次我们的方法，同时还会播放一次声音，恶心的事情就此发生，所以在项目中不得不重写了此组件，以方便项目中多处使用，下面是MyToggle脚本，挂载到对象身上即可，和unity自带的Toggle用法一样，只是在手动设置isOn属性的时候不会自动调用方法。

using System;
using UnityEditor;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using UnityEngine.Serialization;
using UnityEngine.UI;

/// <summary>
/// 自定义Toggle组件
/// </summary>
[RequireComponent(typeof(RectTransform))]
public class MyToggle : Selectable, IEventSystemHandler, IPointerClickHandler, ISubmitHandler, ICanvasElement
{

    /// <summary>
    /// toggle为true时切换显示的底图
    /// </summary>
    public Graphic m_ChangeImage;

    [SerializeField]
    [FormerlySerializedAs("m_IsActive")]
    private bool m_IsOn;

    public MyToggle.ToggleTransition toggleTransition = MyToggle.ToggleTransition.Fade;

    public Toggle.ToggleEvent onValueChanged = new Toggle.ToggleEvent();
    
    /// <summary>
    /// 设置ison属性（自动调用一次方法）
    /// </summary>
    public bool isOn
    {
        get
        {
            return this.m_IsOn;
        }
        set
        {
            this.Set(value);
        }
    }

    /// <summary>
    /// 设置ison属性（不会自动调用方法）
    /// </summary>
    public bool IsOn
    {
        get
        {
            return this.m_IsOn;
        }
        set
        {
            this.Set(value, value, value);
        }
    }


    protected MyToggle()
    {
    }

    public virtual void Rebuild(CanvasUpdate executing)
    {
        if (executing != CanvasUpdate.Prelayout)
            return;
        this.onValueChanged.Invoke(this.m_IsOn);
    }


    public virtual void LayoutComplete()
    {
    }


    public virtual void GraphicUpdateComplete()
    {
    }

    protected override void OnEnable()
    {
        base.OnEnable();
        this.PlayEffect(true);
        this.IsOn = false;
    }


    protected override void OnDisable()
    {
        base.OnDisable();
        this.IsOn = false;
    }


    private void Set(bool value)
    {
        this.Set(value, true);
    }

    private void Set(bool value, bool sendCallback)
    {
        if (this.m_IsOn == value)
            return;
        this.m_IsOn = value;
        this.PlayEffect(this.toggleTransition == MyToggle.ToggleTransition.None);

        if (!sendCallback)
            return;
        this.onValueChanged.Invoke(this.m_IsOn);
    }

    private void Set(bool value, bool sendCallback, bool call)
    {
        if (this.m_IsOn == value)
            return;
        this.m_IsOn = value;
        this.PlayEffect(this.toggleTransition == MyToggle.ToggleTransition.None);

        if (!sendCallback)
            return;
    }

    private void InternalToggle()
    {
        if (!this.IsActive() || !this.IsInteractable())
            return;
        this.isOn = !this.isOn;
    }

    /// <summary>
    /// 点击事件
    /// </summary>
    /// <param name="eventData">Current event.</param>
    public virtual void OnPointerClick(PointerEventData eventData)
    {
        if (eventData.button != PointerEventData.InputButton.Left)
            return;
        this.InternalToggle();
    }

    public virtual void OnSubmit(BaseEventData eventData)
    {
        this.InternalToggle();
    }
     

    public enum ToggleTransition
    {
        None,
        Fade,
    }


    [Serializable]
    public class ToggleEvent : UnityEvent<bool>
    {
    }

    protected override void OnDidApplyAnimationProperties()
    {
        if ((UnityEngine.Object)this.m_ChangeImage != (UnityEngine.Object)null)
        {
            bool flag = !Mathf.Approximately(this.m_ChangeImage.canvasRenderer.GetColor().a, 0.0f);
            if (this.m_IsOn != flag)
            {
                this.m_IsOn = flag;
                this.Set(!flag);
            }
        }
        base.OnDidApplyAnimationProperties();
    }

    private void PlayEffect(bool instant)
    {
        if ((UnityEngine.Object)this.m_ChangeImage == (UnityEngine.Object)null)
            return;
        if (!Application.isPlaying)
            this.m_ChangeImage.canvasRenderer.SetAlpha(!this.m_IsOn ? 0.0f : 1f);
        else
            this.m_ChangeImage.CrossFadeAlpha(!this.m_IsOn ? 0.0f : 1f, !instant ? 0.1f : 0.0f, true);
    }
    protected override void Start()
    {
        this.PlayEffect(true);
    }
    protected override void OnValidate()
    {
        base.OnValidate();
        this.Set(this.m_IsOn, false);
        this.PlayEffect(this.toggleTransition == MyToggle.ToggleTransition.None);
        if (PrefabUtility.GetPrefabType((UnityEngine.Object)this) == PrefabType.Prefab || Application.isPlaying)
            return;
        CanvasUpdateRegistry.RegisterCanvasElementForLayoutRebuild((ICanvasElement)this);
    }
 

}