unity3d scrollview 滚动层dotween移动到指定位置：例如有10项，滚动到第9项

约定不等于承诺〃 2022-06-04 02:37 353阅读 0赞

using UnityEngine;
    using System.Collections;
    using UnityEngine.UI;
    using DG.Tweening;
    
    public enum ScrollLayoutType
    {
        Grid,
        Vertical
    }
    
    //只能竖直方向的滚动
    public class ScrollToItem : MonoBehaviour {
    
        public ScrollLayoutType m_type = ScrollLayoutType.Grid;
        public RectTransform m_content;
        public RectTransform m_view;
        [SerializeField] float m_cellY;
        private void Awake()
        {
            //以后通知订阅放awake
            NotificationCenter.Get().ObjAddEventListener(KEventKey.m_evScrollToItem, gameObject, OnEventScroll);
        }
    
        private void OnDestroy()
        {
            NotificationCenter.Get().ObjRemoveEventListener(KEventKey.m_evScrollToItem, gameObject);
        }
        public void OnEventScroll(Notification noti)
        {
            int idx = (int)noti.param;
    
            switch (m_type)
            {
                case ScrollLayoutType.Grid:
                    ScrolllToIdx(idx);
                    break;
                case ScrollLayoutType.Vertical:
                    ScrollToIdxVertical(idx);
                    break;
                default:
                    break;
            }
        }
        
        void ScrolllToIdx(int idx)
        {
            float length = idx * (m_content.GetComponent<GridLayoutGroup>().cellSize.y + m_content.GetComponent<GridLayoutGroup>().spacing.y);
            float ViewProtH = m_content.childCount * (m_content.GetComponent<GridLayoutGroup>().cellSize.y + m_content.GetComponent<GridLayoutGroup>().spacing.y) - m_view.sizeDelta.y - m_content.GetComponent<GridLayoutGroup>().spacing.y;
            if (length > ViewProtH)
            {
                length = ViewProtH;
            }
            DOTween.To(() => m_content.localPosition, x => m_content.localPosition = x, new Vector3(0, length), 0.5f);
        }
    
        void ScrollToIdxVertical(int idx)
        {
            float length = idx * (m_cellY + m_content.GetComponent<VerticalLayoutGroup>().spacing);
            float ViewProtH = m_content.childCount * (m_cellY + m_content.GetComponent<VerticalLayoutGroup>().spacing) - m_view.sizeDelta.y - m_content.GetComponent<VerticalLayoutGroup>().spacing ;
            if (length > ViewProtH)
            {
                length = ViewProtH;
            }
            DOTween.To(() => m_content.localPosition, x => m_content.localPosition = x, new Vector3(0,length,0), 0.5f);
        }
    }