我有一个商店 GUI，它的内容在使用 Scroll Rect 和 Mask 组合创建的 srollview 中，可以向下和向上滚动。
现在，滚动视图通过在滚动视图区域中的任意位置单击并拖动鼠标或通过与垂直滚动条交互来滚动。
如何使用自定义向上和向下按钮（在下图中以红色圈出）来进行滚动？
问问题
3051 次
1 回答
1
将以下脚本复制到您的项目并将 ScrollRectSnap 脚本应用于您的滚动视图。知道您是否已这样做以使您的滚动视图在按钮单击时对齐，只需使用向上和向下按钮执行以下链接UpArrowPressed和DownArrowPressed，如果您有垂直滚动视图，请不要忘记检查ScrollRectSnap检查器中的Snap In V参数，并且不要对 DownArrowPressed 函数中的 snapper.DraggedOnRight() 调用感到困惑，就好像您已经检查了Snap In V参数然后它会像 snapper.DraggedOnLeft() 一样使用 snapper.DraggedOnLeft() 其他参数您可以根据您的要求设置您必须使用值才能根据您的要求获得它。
public void UpArrowPressed()
{
ScrollRectSnap snapper = GetComponentInChildren<ScrollRectSnap>();
snapper.DraggedOnLeft();
}
public void DownArrowPressed()
{
ScrollRectSnap snapper = GetComponentInChildren<ScrollRectSnap>();
snapper.DraggedOnRight();
}
using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using System;
public class ScrollRectSnap : MonoBehaviour
{
float[] points;
[Tooltip("how many screens or pages are there within the content (steps)")]
public int screens = 1;
[Tooltip("How quickly the GUI snaps to each panel")]
public float snapSpeed;
public float inertiaCutoffMagnitude;
float stepSize;
ScrollRect scroll;
bool LerpH;
float targetH;
[Tooltip("Snap horizontally")]
public bool snapInH = true;
bool LerpV;
float targetV;
[Tooltip("Snap vertically")]
public bool snapInV = true;
public string controllTag;
bool dragInit = true;
int dragStartNearest;
float horizontalNormalizedPosition;
float verticalNormalizedPosition;
public static event Action<int,int> OnEndReached;
public static event Action<int,int,string> OnEndReachedWithTag;
// Use this for initialization
void Start()
{
Init();
// SnapToSelectedIndex(0);
}
void Init()
{
scroll = gameObject.GetComponent<ScrollRect>();
scroll.inertia = true;
if (screens > 0)
{
points = new float[screens];
stepSize = (float)Math.Round(1 / (float)(screens - 1),2);
for (int i = 0; i < screens; i++)
{
points[i] = i * stepSize;
}
}
else
{
points[0] = 0;
}
}
void OnEnable()
{
}
void Update()
{
horizontalNormalizedPosition = scroll.horizontalNormalizedPosition;
verticalNormalizedPosition = scroll.verticalNormalizedPosition;
if (LerpH)
{
scroll.horizontalNormalizedPosition = Mathf.Lerp(scroll.horizontalNormalizedPosition, targetH, snapSpeed * Time.deltaTime);
if (Mathf.Approximately((float)Math.Round(scroll.horizontalNormalizedPosition,2), targetH))
{
LerpH = false;
int target = FindNearest(scroll.horizontalNormalizedPosition, points);
// Debug.LogError("Target : " + target);
if (target == points.Length-1)
{
if (OnEndReached != null)
{
OnEndReached(1,target);
}
if(OnEndReachedWithTag != null)
{
OnEndReachedWithTag(1,target,controllTag);
}
}
else if (target == 0)
{
if (OnEndReached != null)
{
OnEndReached(-1,target);
}
if(OnEndReachedWithTag != null)
{
OnEndReachedWithTag(-1,target,controllTag);
}
}
else
{
if (OnEndReached != null)
{
OnEndReached(0,target);
}
if(OnEndReachedWithTag != null)
{
OnEndReachedWithTag(0,target,controllTag);
}
}
}
}
if (LerpV)
{
scroll.verticalNormalizedPosition = Mathf.Lerp(scroll.verticalNormalizedPosition, targetV, snapSpeed * Time.deltaTime);
if (Mathf.Approximately(scroll.verticalNormalizedPosition, targetV))
{
LerpV = false;
}
}
}
public void DragEnd()
{
int target = FindNearest(scroll.horizontalNormalizedPosition, points);
if (target == dragStartNearest && scroll.velocity.sqrMagnitude > inertiaCutoffMagnitude * inertiaCutoffMagnitude)
{
if (scroll.velocity.x < 0)
{
target = dragStartNearest + 1;
}
else if (scroll.velocity.x > 1)
{
target = dragStartNearest - 1;
}
target = Mathf.Clamp(target, 0, points.Length - 1);
}
if (scroll.horizontal && snapInH )
{
targetH = points[target];
LerpH = true;
}
if (scroll.vertical && snapInV && scroll.verticalNormalizedPosition > 0f && scroll.verticalNormalizedPosition < 1f)
{
targetH = points[target];
LerpH = true;
}
dragInit = true;
}
public void OnDrag()
{
if (dragInit)
{
if (scroll == null)
{
scroll = gameObject.GetComponent<ScrollRect>();
}
dragStartNearest = FindNearest(scroll.horizontalNormalizedPosition, points);
dragInit = false;
}
LerpH = false;
LerpV = false;
}
int FindNearest(float f, float[] array)
{
float distance = Mathf.Infinity;
int output = 0;
for (int index = 0; index < array.Length; index++)
{
if (Mathf.Abs(array[index] - f) < distance)
{
distance = Mathf.Abs(array[index] - f);
output = index;
}
}
return output;
}
public void DraggedOnLeft()
{
OnDrag();
if (scroll.horizontal && snapInH && scroll.horizontalNormalizedPosition > -0.001f && scroll.horizontalNormalizedPosition < 1.001f)
{
// Debug.Log("Before Press, LerpH : " + LerpH);
if (dragStartNearest < points.Length-1)
{
targetH = points[dragStartNearest+1];
LerpH = true;
}
else
{
targetH = points[dragStartNearest];
LerpH = true;
}
// Debug.Log("After Press, LerpH : " + LerpH);
}
if (scroll.vertical && snapInV && scroll.verticalNormalizedPosition > 0f && scroll.verticalNormalizedPosition < 1f)
{
if (dragStartNearest < points.Length-1)
{
targetV = points[dragStartNearest+1];
LerpV = true;
}
else
{
targetV = points[dragStartNearest];
LerpV = true;
}
}
dragInit = true;
}
public void DraggedOnRight()
{
OnDrag();
if (scroll.horizontal && snapInH && scroll.horizontalNormalizedPosition > -0.001f && scroll.horizontalNormalizedPosition < 1.001f)
{
if (dragStartNearest>0)
{
targetH = points[dragStartNearest-1];
LerpH = true;
}
else
{
targetH = points[dragStartNearest];
LerpH = true;
}
}
if (scroll.vertical && snapInV && scroll.verticalNormalizedPosition > 0f && scroll.verticalNormalizedPosition < 1f)
{
if (dragStartNearest > 0)
{
targetV = points[dragStartNearest-1];
LerpV = true;
}
else
{
targetV = points[dragStartNearest];
LerpV = true;
}
}
dragInit = true;
}
public void SnapToSelectedIndex(int index)
{
if (points == null)
{
Init();
}
dragInit = false;
LerpH = false;
LerpV = false;
targetH = points[index];
LerpH = true;
dragInit = true;
}
}于 2015-08-13T18:35:57.047 回答