using UnityEngine;
using System;
using System.Collections;
using UnityEngine.UI;
public class RaycastFilter : MonoBehaviour, ICanvasRaycastFilter
{
 private RectTransform rectTransform;
 private Image image;
 public void Awake()
 {
  collider2D = GetComponent<BoxCollider2D>();
  image = GetComponent<Image>();
 }
 public bool IsRaycastLocationValid(Vector2 screenPosition, Camera raycastEventCamera) //uGUI callback
 {
  if (image == null)
   return true;
  Vector2 localPoint;
  RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, screenPosition, raycastEventCamera, out localPoint);
  var normalized = new Vector2(
   (localPoint.x + rectTransform.pivot.x*rectTransform.rect.width)/rectTransform.rect.width,
   (localPoint.y + rectTransform.pivot.y*rectTransform.rect.height)/rectTransform.rect.width);
  Rect rect = image.sprite.textureRect;
  var x = Mathf.FloorToInt(rect.x + rect.width * normalized.x);
  var y = Mathf.FloorToInt(rect.y + rect.height * normalized.y);
  try
  {
   return image.sprite.texture.GetPixel(x,y).a > 0.2f;
  }
  catch (UnityException e)
  {
   Debug.LogError("Mask texture not readable, set your sprite to Texture Type 'Advanced' and check 'Read/Write Enabled'");
   Destroy(this);
   return false;
  }
 }
}

制作美术字体的教程网上有很多了，我借鉴了网上众多大神的方法， 在此感谢他们。

操作方法：选中customFont文件和导出的数据文件，再点击菜单 MakeFont>>Make，这样就把数据绑定了。

突然发现uGUI没有给出可以直接用的长按事件。。。

上个没有注释的代码，代码说明一切。

using UnityEngine;
using System.Collections;
using UnityEngine.Events;
using UnityEngine.EventSystems;

public class UILongPressEvent : MonoBehaviour,IPointerDownHandler,IPointerExitHandler,IPointerUpHandler
{
    [SerializeField]
    UnityEvent m_onLongPress = new UnityEvent();

    float interval = 0.1f;
    float longPressDelay = 0.5f;

    private bool isTouchDown = false;
    private bool isLongpress = false;
    private float touchBegin = 0;
    private float lastInvokeTime = 0;

    // Update is called once per frame
    void Update () 
    {
        if (isTouchDown)
        {
            if (isLongpress)
            {
                if (Time.time - lastInvokeTime > interval)
                {
                    m_onLongPress.Invoke();
                    lastInvokeTime = Time.time;
                }
            }
            else
            {
                if (Time.time - touchBegin > longPressDelay)
                {
                    isLongpress = true;
                }
            }
        }
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        touchBegin = Time.time;
        isTouchDown = true;
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        isTouchDown = false;
        isLongpress = false;
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        isTouchDown = false;
        isLongpress = false;
    }
}