效果图
用的是UGUI
我先说思路
通过判断元素的位置信息来改变Hierarchy的顺序 实现无限滚动
改变位置的同时也要不断的调整Content的位置防止乱跳
元素锁定就是直接锁死的元素的移动范围 当只有拖动大于一定程度时才会发生改变
然后是面板设置
整体结构是这样子的
需要注意的是Content需要的两个组件
Content的爸爸只需要一个脚本
大小改变曲线（大致就行）
颜色渐变曲线
最后是脚本
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI; public class DateControl : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler { public enum ItemType { _year, _month, _day } public ItemType _itemtype; RectTransform conentRect; RectTransform targetRec; Vector3 oldDragPos; Vector3 newDragPos; public AnimationCurve curve_scale;//改变大小曲线
public AnimationCurve curve_color;//渐变效果曲线 List<Text> textList = new List<Text>(); Button testBtn; float
itemHeight, //子项item的高
contentParentHeight, //Content爸爸的高
itemNum, //子项数量
itemHeight_min, //子项最小发生改变位置
itemHeight_max, //子项最大发生改变位置
conentLimit, //Conent纠正位置
conentSpacing; //子项间隔大小 float deltaX, deltaY; [HideInInspector]
public static int _year, _month, _day; [HideInInspector]
int dateItemNum; Color itemColor_hig = new Color32(, , , ); void Awake() {
conentRect = transform.FindChild("Content").GetComponent<RectTransform>();
targetRec = transform.parent.FindChild("HighlightTarget").GetComponent<RectTransform>(); } void OnEnable() {
ItemList();
} void Start() {
switch (_itemtype) {
case ItemType._year: InstantiateData(, ); break;
case ItemType._month: InstantiateData(, ); break;
case ItemType._day: InstantiateData(, ); break;
} itemNum = transform.FindChild("Content").childCount - ; contentParentHeight = conentRect.parent.GetComponent<RectTransform>().sizeDelta.y; conentSpacing = conentRect.GetComponent<VerticalLayoutGroup>().spacing / ; itemHeight = textList[].rectTransform.sizeDelta.y + conentSpacing; if (itemNum % == ) conentLimit = (itemHeight + ) / ; else conentLimit = ; conentRect.anchoredPosition = new Vector2(conentRect.anchoredPosition.x, conentLimit); deltaX = textList[].GetComponent<RectTransform>().sizeDelta.x;
deltaY = textList[].GetComponent<RectTransform>().sizeDelta.y; Invoke("ItemList", 0.05f); } /// <summary>
/// 生成子项item
/// </summary>
/// <param name="itemNum">子项数量</param>
/// <param name="dat">子项最大值</param>
void InstantiateData(int itemNum, int dat) {
GameObject go;
Text testObj = conentRect.FindChild("Text").GetComponent<Text>();
for (int i = dat - itemNum + ; i <= dat; i++) {
go = Instantiate(testObj.gameObject, conentRect);
go.GetComponent<Text>().text = i.ToString();
go.name = i.ToString();
textList.Add(go.GetComponent<Text>());
ShowItem(true);
}
Destroy(conentRect.FindChild("Text").gameObject);
} /// <summary>
/// 是增加或减少
/// </summary>
/// <param name="isIncreaseOrdecrease"></param>
void ShowItem(bool isIncreaseOrdecrease) {
itemHeight_min = -itemHeight; if (_itemtype == ItemType._day) itemHeight_max = -itemHeight * itemNum - ;
else itemHeight_max = -itemHeight * itemNum; if (isIncreaseOrdecrease) {
foreach (Text rectItem in textList) {
if (rectItem.GetComponent<RectTransform>().anchoredPosition.y > itemHeight_min) {
print("+");
rectItem.transform.SetSiblingIndex((int)itemNum);
}
}
print(itemHeight_min);
} else {
foreach (Text rectItem in textList) {
if (rectItem.GetComponent<RectTransform>().anchoredPosition.y < itemHeight_max) {
print("-");
rectItem.transform.SetSiblingIndex();
}
}
print(itemHeight_max); }
} /// <summary>
/// 渐变效果，改变大小，高亮显示
/// </summary>
void ItemList() {
foreach (Text item in textList) {
float indexA = Mathf.Abs(item.GetComponent<RectTransform>().position.y - targetRec.position.y);
float indexSc_scale = Mathf.Abs(curve_scale.Evaluate(indexA / contentParentHeight));
float indexSc_color = Mathf.Abs(curve_color.Evaluate(indexA / contentParentHeight));
if (indexA < ) {
item.color = itemColor_hig;
switch (_itemtype) {
case ItemType._year: _year = int.Parse(item.text); break;
case ItemType._month: _month = int.Parse(item.text); break;
case ItemType._day: _day = int.Parse(item.text); break;
}
} else item.color = new Color(, , , - indexSc_color); item.GetComponent<RectTransform>().localScale = new Vector3( - indexSc_scale, - indexSc_scale * , - indexSc_scale);
//item.GetComponent<RectTransform>().sizeDelta = new Vector2(deltaX - (deltaX * indexSc), deltaY - (deltaY * indexSc));
} } /// <summary>
/// 获取int类型日期，并转换为指定格式
/// </summary>
/// <returns></returns>
public static string GetDateInfo() { return _year + "-" + _month + "-" + _day; } /// <summary>
/// 纠正Conent位置
/// </summary>
void UpdateEx() {
if (conentRect.anchoredPosition.y > conentLimit) {
ShowItem(true);
conentRect.anchoredPosition = new Vector2(conentRect.anchoredPosition.x, conentRect.anchoredPosition.y - itemHeight);
}
if (conentRect.anchoredPosition.y < conentLimit) {
ShowItem(false);
conentRect.anchoredPosition = new Vector2(conentRect.anchoredPosition.x, conentRect.anchoredPosition.y + itemHeight);
}
} /// <summary>
/// 获取拖拽信息并改变Conent位置
/// </summary>
/// <param name="eventData"></param>
void SetDraggedPosition(PointerEventData eventData) {
if (RectTransformUtility.ScreenPointToWorldPointInRectangle(conentRect, eventData.position, eventData.pressEventCamera, out newDragPos)) {
newDragPos = eventData.position;
if (Mathf.Abs(newDragPos.y - oldDragPos.y) >= itemHeight) {
if (newDragPos.y > oldDragPos.y) {
conentRect.anchoredPosition = new Vector2(conentRect.anchoredPosition.x, conentRect.anchoredPosition.y + itemHeight);
oldDragPos += new Vector3(, itemHeight, );
ItemList();
} else {
conentRect.anchoredPosition = new Vector2(conentRect.anchoredPosition.x, conentRect.anchoredPosition.y - itemHeight);
oldDragPos -= new Vector3(, itemHeight, );
ItemList();
}
}
}
} /// <summary>
/// 当开始拖拽
/// </summary>
/// <param name="eventData"></param>
public void OnBeginDrag(PointerEventData eventData) {
oldDragPos = eventData.position;
} public void OnDrag(PointerEventData eventData) {
SetDraggedPosition(eventData);
UpdateEx();
} public void OnEndDrag(PointerEventData eventData) {
SetDraggedPosition(eventData);
UpdateEx();
}
}
照着来的话基本没什么问题
因为赶时间所以很多地方写的简单粗暴请谅解
如果调整元素大小或者间隙大小 需要改变itemHeight_min 和 itemHeight_max 的值
他们分别为
itemHeight_min
itemHeight_max
也就是元素的最顶层和最底层的Y值
以上就是年月日选择器的具体步骤