unity_UGUI养成之路03

关卡分页设计

功能1：通过直接滑动：

添加自动排序组件

设置通过添加组件设置内容的滑动，多余内容的隐藏

  功能2：通过点击下面的圆圈滑动

上述代码实现：

using UnityEngine;
using System.Collections;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class LevelButtonScrollRect : MonoBehaviour ,IBeginDragHandler,IEndDragHandler
{
    private ScrollRect scrollRect;

public float smoothing = 4; //插值的速度
    private float[] pageArray=new float[]{ 0,0.33333f,0.66666f,1 }; //每个页面X轴坐标

private float targetHorizontalPosition=0; //距离最近页面的X坐标
    private bool isDraging = false; //是否拖拽的标志位

public Toggle[] toggleArray; //圆圈数组
    
    void Start ()
    {
        scrollRect = GetComponent<ScrollRect>();
    }
    
    void Update ()
    {
        if(isDraging==false)
            scrollRect.horizontalNormalizedPosition = Mathf.Lerp(scrollRect.horizontalNormalizedPosition,
                targetHorizontalPosition, Time.deltaTime*smoothing);
    }

public void OnBeginDrag(PointerEventData eventData)
    {
        isDraging = true;
    }

public void OnEndDrag(PointerEventData eventData)
    {
        isDraging = false;
        //找到当前位置与每页距离最小的页面，并切换到该页面
        float posX = scrollRect.horizontalNormalizedPosition;
        int index = 0;
        float offset = Mathf.Abs(pageArray[index] - posX);
        for (int i = 1; i < pageArray.Length; i++)
        {
            float offsetTemp = Mathf.Abs(pageArray[i] - posX);
            if (offsetTemp < offset)
            {
                index = i;
                offset = offsetTemp;
            }
        }
        targetHorizontalPosition = pageArray[index];
        toggleArray[index].isOn = true;
        //scrollRect.horizontalNormalizedPosition = pageArray[index];
    }
    public void MoveToPage1(bool isOn) {
        if (isOn)
        {
            targetHorizontalPosition = pageArray[0];
        }
    }
    public void MoveToPage2(bool isOn) {
        if (isOn) {
            targetHorizontalPosition = pageArray[1];
        }

}
    public void MoveToPage3(bool isOn) {
        if (isOn)
        {
            targetHorizontalPosition = pageArray[2];
        }

}
    public void MoveToPage4(bool isOn) {

if (isOn)
        {
            targetHorizontalPosition = pageArray[3];
        }
    }
}