Unity EventSystems点击事件详解

一 , 前言

14年那会需要用Unity做一个棋牌游戏.当时要对牌进行选择(有这个需求),因为当时只是小小白,Flash那一套注册事件找了半天没有找到,最后稀里糊涂的用了射线检测(我去).基于此,我觉得有必要写这篇文章.

二 , 实现类似于Flash的CLICK注册

Ⅰ, UI设计

在一张Image上挂载ClickCard脚本(实现了Click,选中和不选中的状态)

 ①, ClickCard 参数

       a,  moveCure : 牌向上(选中动画),向下(取消选中动画)的曲线

       b, offy : 选中后,牌向上移动的距离(像素)

       c, durationMove : 牌向上或者向下移动的时间(秒)

     Ⅱ, ClickCard.cs代码

          值得注意的是继承 UnityEngine.EventSystems.IPointerClickHandler

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

public class ClickCard : MonoBehaviour, IPointerClickHandler
{
    /// <summary>
    /// 移动曲线
    /// </summary>
    [SerializeField]
    private AnimationCurve moveCurve;
    /// <summary>
    /// 选中后向上移动的距离(px)
    /// </summary>
    [SerializeField]
    private float offY;
    [SerializeField]
    private float durationMove;
    /// <summary>
    /// 卡牌的当前状态
    /// </summary>
    private TypeCard status;
    private Vector3 original;
    private float accumulationX;
    private Vector3 startVec;//开始位置
    private Vector3 endVec;//结束位置
    private float curDurationMove;
    public void OnPointerClick(PointerEventData eventData)
    {
        if (eventData.clickCount == 1)
        {
            this.startVec = (this.transform as RectTransform).anchoredPosition;
            status = status == TypeCard.UN_SELECTED ? TypeCard.SELECTED : TypeCard.UN_SELECTED;
            switch (status)
            {
                case TypeCard.UN_SELECTED:
                    this.endVec = this.original;
                    break;
                case TypeCard.SELECTED:
                    this.endVec = this.original;
                    this.endVec.y += this.offY;
                    break;
            }
            //根据距离(px)减少时间
            float curOffY = Mathf.Abs(this.startVec.y - this.endVec.y);
            if (curOffY == 0)
            {
                this.accumulationX = 1;
            }
            else
            {
                this.accumulationX = 0;
                this.curDurationMove = Mathf.Abs(curOffY / this.offY) * this.durationMove;
            }
        }
    }

    void Awake()
    {
        this.status = TypeCard.UN_SELECTED;
        this.accumulationX = 1;
    }

    // Start is called before the first frame update
    void Start()
    {
        this.original = (this.transform as RectTransform).anchoredPosition;
    }

    // Update is called once per frame
    void Update()
    {
        if (this.accumulationX == 1) return;
        this.accumulationX += Time.deltaTime / this.curDurationMove;
        if (this.accumulationX > 1)
            this.accumulationX = 1;
        (this.transform as RectTransform).anchoredPosition = Vector3.Lerp(startVec, endVec, this.moveCurve.Evaluate(this.accumulationX));
    }
}

enum TypeCard : ushort
{
    UN_SELECTED = 0,
    SELECTED = 1,
}

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