unity实现图片轮播效果_Unity实现图片轮播组件
游戲中有時候會見到圖片輪播的效果，那么這里就自己封裝了一個，包括自動輪播、切頁按鈕控制、頁碼下標更新、滑動輪播、切頁后的回調等等 。
下面，先上一個簡陋的gif動態效果圖
從圖中可以看出，該示例包括了三張圖片的輪播，左右分別是上一張和下一張的按鈕，右下角顯示了當前是第幾章的頁碼下標。
直接上腳本：
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using UnityEngine.UI;
namespace UnityEngine.UI
{
[AddComponentMenu("UI/Slidershow", 39)] //添加菜單
[ExecuteInEditMode] //編輯模式下可執行
[DisallowMultipleComponent] //不可重復
[RequireComponent(typeof(RectTransform))] //依賴于RectTransform組件
public class Slideshow : UIBehaviour,IPointerDownHandler,IPointerUpHandler
{
public enum MovementType
{
///
/// 循環
///
Circulation, //循環，輪播到最后一頁之后，直接回到第一頁
///
/// 來回往復
///
PingPong, //來回往復，輪播到最后一頁之后，倒序輪播，到第一頁之后，同理
}
public enum MoveDir
{
Left,
Right,
}
[SerializeField]
private MovementType m_movement = MovementType.Circulation;
public MovementType Movement { get { return m_movement; } set { m_movement = value; } }
[SerializeField]
private RectTransform m_content;
public RectTransform Content { get { return m_content; } set { m_content = value; } }
[SerializeField]
private Button m_lastPageButton;
public Button LastPageButton { get { return m_lastPageButton; } set { m_lastPageButton = value; } }
[SerializeField]
private Button m_nextPageButton;
public Button NextPageButton { get { return m_nextPageButton; } set { m_nextPageButton = value; } }
///
/// 自動輪播時長
///
[SerializeField]
private float m_showTime = 2.0f;
public float ShowTime { get { return m_showTime; } set { m_showTime = value; } }
///
/// 是否自動輪播
///
[SerializeField]
private bool m_autoSlide = false;
public bool AutoSlide { get { return m_autoSlide; }set { m_autoSlide = value; } }
///
/// 自動輪播方向，-1表示向左，1表示向右
///
private MoveDir m_autoSlideDir = MoveDir.Right;
///
/// 是否允許拖動切頁
///
[SerializeField]
private bool m_allowDrag = true;
public bool AllowDrag { get { return m_allowDrag; }set { m_allowDrag = value; } }
///
/// 當前顯示頁的頁碼，下標從0開始
///
private int m_curPageIndex = 0;
public int CurPageIndex { get { return m_curPageIndex; } }
///
/// 最大頁碼
///
private int m_maxPageIndex = 0;
public int MaxPageIndex { get { return m_maxPageIndex; } }
///
/// 圓圈頁碼ToggleGroup
///
[SerializeField]
private ToggleGroup m_pageToggleGroup;
public ToggleGroup PageToggleGroup { get { return m_pageToggleGroup; } set { m_pageToggleGroup = value; } }
///
/// 圓圈頁碼Toggle List
///
private List m_pageToggleList;
public List PageToggleLise { get { return m_pageToggleList; }}
//item數目
private int m_itemNum = 0;
public int ItemNum { get { return m_itemNum; } }
//以Toggle為Key，返回頁碼
private Dictionary m_togglePageNumDic = null;
private float m_time = 0f;
private List m_childItemPos = new List();
private GridLayoutGroup m_grid = null;
protected override void Awake()
{
base.Awake();
if (null == m_content)
{
throw new Exception("Slideshow content is null");
}
else
{
m_grid = m_content.GetComponent();
if (m_grid == null)
{
throw new Exception("Slideshow content is miss GridLayoutGroup Component");
}
InitChildItemPos();
}
if (null != m_lastPageButton)
{
m_lastPageButton.onClick.AddListener(OnLastPageButtonClick);
}
if (null != m_nextPageButton)
{
m_nextPageButton.onClick.AddListener(OnNextPageButtonClick);
}
if (null != m_pageToggleGroup)
{
int toggleNum = m_pageToggleGroup.transform.childCount;
if (toggleNum > 0)
{
m_pageToggleList = new List();
m_togglePageNumDic = new Dictionary();
for (int i = 0; i < toggleNum; i++)
{
Toggle childToggle = m_pageToggleGroup.transform.GetChild(i).GetComponent();
if (null != childToggle)
{
m_pageToggleList.Add(childToggle);
m_togglePageNumDic.Add(childToggle, i);
childToggle.onValueChanged.AddListener(OnPageToggleValueChanged);
}
}
m_itemNum = m_pageToggleList.Count;
m_maxPageIndex = m_pageToggleList.Count - 1;
}
}
UpdateCutPageButtonActive(m_curPageIndex);
}
private void InitChildItemPos()
{
int childCount = m_content.transform.childCount;
float cellSizeX = m_grid.cellSize.x;
float spacingX = m_grid.spacing.x;
float posX = -cellSizeX * 0.5f;
m_childItemPos.Add(posX);
for (int i = 1; i < childCount; i++)
{
posX -= cellSizeX + spacingX;
m_childItemPos.Add(posX);
}
}
private void OnPageToggleValueChanged(bool ison)
{
if (ison)
{
Toggle activeToggle = GetActivePageToggle();
if (m_togglePageNumDic.ContainsKey(activeToggle))
{
int page = m_togglePageNumDic[activeToggle];
SwitchToPageNum(page);
}
}
}
private Toggle GetActivePageToggle()
{
if (m_pageToggleGroup == null || m_pageToggleList == null || m_pageToggleList.Count <= 0)
{
return null;
}
for (int i = 0; i < m_pageToggleList.Count; i++)
{
if (m_pageToggleList[i].isOn)
{
return m_pageToggleList[i];
}
}
return null;
}
///
/// 切換至某頁
///
/// 頁碼
private void SwitchToPageNum(int pageNum)
{
if (pageNum < 0 || pageNum > m_maxPageIndex)
{
throw new Exception("page num is error");
}
if (pageNum == m_curPageIndex)
{
//目標頁與當前頁是同一頁
return;
}
m_curPageIndex = pageNum;
if (m_movement == MovementType.PingPong)
{
UpdateCutPageButtonActive(m_curPageIndex);
}
Vector3 pos = m_content.localPosition;
m_content.localPosition = new Vector3(m_childItemPos[m_curPageIndex], pos.y, pos.z);
m_pageToggleList[m_curPageIndex].isOn = true;
if (m_onValueChanged != null)
{
//執行回調
m_onValueChanged.Invoke(m_pageToggleList[m_curPageIndex].gameObject);
}
}
///
/// 根據頁碼更新切頁按鈕active
///
///
private void UpdateCutPageButtonActive(int pageNum)
{
if (pageNum == 0)
{
UpdateLastButtonActive(false);
UpdateNextButtonActive(true);
}
else if (pageNum == m_maxPageIndex)
{
UpdateLastButtonActive(true);
UpdateNextButtonActive(false);
}
else
{
UpdateLastButtonActive(true);
UpdateNextButtonActive(true);
}
}
private void OnNextPageButtonClick()
{
m_time = Time.time; //重新計時
switch (m_movement)
{
case MovementType.Circulation:
SwitchToPageNum((m_curPageIndex + 1) % m_itemNum);
break;
case MovementType.PingPong:
//該模式下，會自動隱藏切頁按鈕
SwitchToPageNum(m_curPageIndex + 1);
break;
default:
break;
}
Debug.Log(m_content.localPosition);
}
private void OnLastPageButtonClick()
{
m_time = Time.time; //重新計時
switch (m_movement)
{
case MovementType.Circulation:
SwitchToPageNum((m_curPageIndex + m_itemNum - 1) % m_itemNum);
break;
case MovementType.PingPong:
//該模式下，會自動隱藏切頁按鈕
SwitchToPageNum(m_curPageIndex - 1);
break;
default:
break;
}
}
private void UpdateLastButtonActive(bool activeSelf)
{
if (null == m_lastPageButton)
{
throw new Exception("Last Page Button is null");
}
bool curActive = m_lastPageButton.gameObject.activeSelf;
if (curActive != activeSelf)
{
m_lastPageButton.gameObject.SetActive(activeSelf);
}
}
private void UpdateNextButtonActive(bool activeSelf)
{
if (null == m_nextPageButton)
{
throw new Exception("Next Page Button is null");
}
bool curActive = m_nextPageButton.gameObject.activeSelf;
if (curActive != activeSelf)
{
m_nextPageButton.gameObject.SetActive(activeSelf);
}
}
private Vector3 m_originDragPos = Vector3.zero;
private Vector3 m_desDragPos = Vector3.zero;
private bool m_isDrag = false;
public void OnPointerDown(PointerEventData eventData)
{
if (!m_allowDrag)
{
return;
}
if (eventData.button != PointerEventData.InputButton.Left)
{
return;
}
if (!IsActive())
{
return;
}
m_isDrag = true;
m_originDragPos = eventData.position;
}
public void OnPointerUp(PointerEventData eventData)
{
m_desDragPos = eventData.position;
MoveDir dir = MoveDir.Right;
if (m_desDragPos.x < m_originDragPos.x)
{
dir = MoveDir.Left;
}
switch (dir)
{
case MoveDir.Left:
if (m_movement == MovementType.Circulation || (m_movement == MovementType.PingPong && m_curPageIndex != 0))
{
OnLastPageButtonClick();
}
break;
case MoveDir.Right:
if (m_movement == MovementType.Circulation || (m_movement == MovementType.PingPong && m_curPageIndex != m_maxPageIndex))
{
OnNextPageButtonClick();
}
break;
}
m_isDrag = false;
}
///
/// 切頁后回調函數
///
[Serializable]
public class SlideshowEvent : UnityEvent { }
[SerializeField]
private SlideshowEvent m_onValueChanged = new SlideshowEvent();
public SlideshowEvent OnValueChanged { get { return m_onValueChanged; } set { m_onValueChanged = value; } }
public override bool IsActive()
{
return base.IsActive() && m_content != null;
}
private void Update()
{
if (m_autoSlide && !m_isDrag)
{
if (Time.time > m_time + m_showTime)
{
m_time = Time.time;
switch (m_movement)
{
case MovementType.Circulation:
m_autoSlideDir = MoveDir.Right;
break;
case MovementType.PingPong:
if (m_curPageIndex == 0)
{
m_autoSlideDir = MoveDir.Right;
}
else if (m_curPageIndex == m_maxPageIndex)
{
m_autoSlideDir = MoveDir.Left;
}
break;
}
switch (m_autoSlideDir)
{
case MoveDir.Left:
OnLastPageButtonClick();
break;
case MoveDir.Right:
OnNextPageButtonClick();
break;
}
}
}
}
}
}
這里提供了一個枚舉MovementType，該枚舉定義了兩種循環方式，其中Circulation循環，是指輪播到最后一頁之后，直接回到第一頁；而PingPong相信大家你熟悉了，就是來回往復的。
其中還提供了對每張圖顯示的時長進行設置，還有是否允許自動輪播的控制，是否允許拖動切頁控制，等等。。其實將圖片作為輪播子元素只是其中之一而已，完全可以將ScrollRect作為輪播子元素，這樣每個子元素又可以滑動閱覽了。
這里還提供了兩個編輯器腳本，一個是SlideshowEditor(依賴Slideshow組件)，另一個是給用戶提供菜單用的CreateSlideshow，代碼分別如下：
using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
public class CreateSlideshow : Editor
{
private static GameObject m_slideshowPrefab = null;
private static GameObject m_canvas = null;
[MenuItem("GameObject/UI/Slideshow")]
static void CreateSlideshowUI(MenuCommand menuCommand)
{
if (null == m_slideshowPrefab)
{
m_slideshowPrefab = Resources.Load("Slideshow");
if (null == m_slideshowPrefab)
{
Debug.LogError("Prefab Slideshow is null");
return;
}
}
m_canvas = menuCommand.context as GameObject;
if (m_canvas == null || m_canvas.GetComponentInParent() == null)
{
m_canvas = GetOrCreateCanvasGameObject();
}
GameObject go = GameObject.Instantiate(m_slideshowPrefab, m_canvas.transform);
go.transform.localPosition = Vector3.zero;
go.name = "Slideshow";
Selection.activeGameObject = go;
}
static public GameObject GetOrCreateCanvasGameObject()
{
GameObject selectedGo = Selection.activeGameObject;
Canvas canvas = (selectedGo != null) ? selectedGo.GetComponentInParent() : null;
if (canvas != null && canvas.gameObject.activeInHierarchy)
return canvas.gameObject;
canvas = Object.FindObjectOfType(typeof(Canvas)) as Canvas;
if (canvas != null && canvas.gameObject.activeInHierarchy)
return canvas.gameObject;
return CreateCanvas();
}
public static GameObject CreateCanvas()
{
var root = new GameObject("Canvas");
root.layer = LayerMask.NameToLayer("UI");
Canvas canvas = root.AddComponent();
canvas.renderMode = RenderMode.ScreenSpaceOverlay;
root.AddComponent();
root.AddComponent();
Undo.RegisterCreatedObjectUndo(root, "Create " + root.name);
CreateEventSystem();
return root;
}
public static void CreateEventSystem()
{
var esys = Object.FindObjectOfType();
if (esys == null)
{
var eventSystem = new GameObject("EventSystem");
GameObjectUtility.SetParentAndAlign(eventSystem, null);
esys = eventSystem.AddComponent();
eventSystem.AddComponent();
Undo.RegisterCreatedObjectUndo(eventSystem, "Create " + eventSystem.name);
}
}
}
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor.Advertisements;
using UnityEngine.UI;
namespace UnityEditor.UI
{
[CustomEditor(typeof(Slideshow), true)]
public class SlideshowEditor : Editor
{
SerializedProperty m_movement;
SerializedProperty m_content;
SerializedProperty m_lastPageButton;
SerializedProperty m_nextPageButton;
SerializedProperty m_showTime;
SerializedProperty m_pageToggleGroup;
SerializedProperty m_onValueChanged;
SerializedProperty m_allowDrag;
SerializedProperty m_autoSlide;
protected virtual void OnEnable()
{
m_movement = serializedObject.FindProperty("m_movement");
m_content = serializedObject.FindProperty("m_content");
m_lastPageButton = serializedObject.FindProperty("m_lastPageButton");
m_nextPageButton = serializedObject.FindProperty("m_nextPageButton");
m_showTime = serializedObject.FindProperty("m_showTime");
m_pageToggleGroup = serializedObject.FindProperty("m_pageToggleGroup");
m_onValueChanged = serializedObject.FindProperty("m_onValueChanged");
m_allowDrag = serializedObject.FindProperty("m_allowDrag");
m_autoSlide = serializedObject.FindProperty("m_autoSlide");
}
public override void OnInspectorGUI()
{
serializedObject.Update();
EditorGUILayout.PropertyField(m_movement);
EditorGUILayout.PropertyField(m_content);
EditorGUILayout.PropertyField(m_lastPageButton);
EditorGUILayout.PropertyField(m_nextPageButton);
EditorGUILayout.PropertyField(m_allowDrag);
EditorGUILayout.PropertyField(m_autoSlide);
EditorGUILayout.PropertyField(m_showTime);
EditorGUILayout.PropertyField(m_pageToggleGroup);
EditorGUILayout.Space();
EditorGUILayout.PropertyField(m_onValueChanged);
//不加這句代碼，在編輯模式下，無法將物體拖拽賦值
serializedObject.ApplyModifiedProperties();
}
}
}
這兩個腳本中使用了一些拓展編輯器的知識，后續在另外寫博客介紹 。
其中腳本CreateSlideshow中使用UGUI源碼中的DefaultControls腳本里的方法，有興趣可以去下載查閱。
Demo工程下載地址
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。
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