排除unity 2021中数组中的项目

Question

我已经开始为我的游戏开发早期的alpha菜单，我一直在想如何排除数组中的项目，特别是在unity中。我正在努力制作除当前使用的物品外的所有物品。我不知道我该怎么做，如果有人能帮忙，那将是令人惊讶的。

这是我当前的代码：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
[System.Serializable]
public class CS
{
public List<GameObject> CanvasButtons;
}
public class CanvasSwitcher : MonoBehaviour
{

public List<CS> Screen = new List<CS>();
static int switcher;
public static void ScreenSwitchPlus()
{
switcher += 1;
}
public static void ScreenSwitchMinus()
{
switcher -= 1;
}
public void Update()
{

foreach(GameObject l in Screen[switcher].CanvasButtons)
{
l.SetActive(true);
}

}
}

Answer 1

在这里使用for循环而不是foreach循环会更明智：

public void Update()
{
int ignore = 2;
for(int i = 0; i < Screen[switcher].CanvasButtons.Count; i++)
{
if(i != ignore)
Screen[switcher].CanvasButtons[i].SetActive(true);
else
Screen[switcher].CanvasButtons[i].SetActive(false);
}        
}

如果没有if(承认可读性较差(，它可能会更短：

public void Update()
{
int ignore = 2;
for(int i = 0; i < Screen[switcher].CanvasButtons.Count; i++)
{
Screen[switcher].CanvasButtons[i].SetActive(i != ignore);
}        
}

甚至更短的时间将CanvasButtons从循环中取出：

public void Update()
{
int ignore = 2;
var collection = Screen[switcher].CanvasButtons;
for(int i = 0; i < collection.Count; i++)
{
collection[i].SetActive(i != ignore);
}        
}

Answer 2

我搞定了！有一段时间我有点头脑迟钝，我在第二个for语句中搞砸了一些值，但我明白了。我会在这里发布代码。我总是忘了数学上的小事。就像我常说的，我不解决问题，我制造问题。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
[System.Serializable]
public class CS
{
public List<GameObject> CanvasButtons;
}
public class CanvasSwitcher : MonoBehaviour
{
public List<CS> Screen = new List<CS>();
static int switcher;
public static void ScreenSwitchPlus()
{
switcher += 1;
}
public static void ScreenSwitchMinus()
{
switcher -= 1;
}
public void FixedUpdate()
{
List<CS> csco = Screen;
for(int i1 = 0; i1 < csco.Count;)
{
List<GameObject> collection = csco[i1].CanvasButtons;
for (int i = 0; i < collection.Count; i++)
{
collection[i].SetActive(i1 == switcher);
switch(i == collection.Count - 1)
{
case true:
i1++;
break;
}
}
}

}
}

Answer 3

我觉得你把事情搞得太复杂了。

它可能只是

public void Update()
{
for(var i = 0; i < Screen.Count; i++)
{
foreach(var button in Screen[i].CanvasButtons)
{
button.SetActive(i == switcher);
}
}
}

---

不过还有两点。

首先，我要确保switcher实际上是一个有效的值。你要么想钳制值，使其保持在这样的索引范围内

public static void ScreenSwitchPlus()
{
switcher = Mathf.Clamp(switcher + 1, 0, Screen.Count);
}
public static void ScreenSwitchMinus()
{
switcher = Mathf.Clamp(switcher - 1, 0, Screen.Count);
}

或者你可以根据你的需求，像一样，在末端实现环绕

public static void ScreenSwitchPlus()
{
switcher = (switcher + 1) % Screen.Count;
}
public static void ScreenSwitchMinus()
{
switcher -= 1;
if(switcher < 0) switcher = Screen.Count - 1;
}

最后，如前所述，我根本不会在每帧中获取Update中的值，而是由事件驱动。

如果你真的需要(我认为这只是lazyness；((有那个值和方法static，你可以附加到像这样的事件上

private static event Action<int> OnSwitcherChanged;
public static void ScreenSwitchPlus()
{
switcher = (switcher + 1) % Screen.Count;
OnSwitcherChanged?.Invoke(switcher);
}
public static void ScreenSwitchMinus()
{
switcher -= 1;
if(switcher < 0) switcher = Screen.Count - 1;
OnSwitcherChanged?.Invoke(switcher);
}

然后像一样收听该事件

private void OnEnable()
{
OnSwitcherChanged += HandleSwitchChanged;
}
private void OnDisable()
{
OnSwitcherChanged -= HandleSwitchChanged;
}
private void HandleSwitchChanged(int newIndex)
{
for(var i = 0; i < Screen.Count; i++)
{
foreach(var button in Screen[i].CanvasButtons)
{
button.SetActive(i == switcher);
}
}
}

Answer 4

试试这个

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
[System.Serializable]
public class CS {
public List<GameObject> CanvasButtons;
}
public class CanvasSwitcher : MonoBehaviour {
public List<CS> Screen = new List<CS>();
private static bool m_changed = false;
private static int m_lastSwitcher = 0;
private static int m_switcher = 0;
static int switcher {
get {
return m_switcher;
}
set {
if ( switcher != value ) {
m_lastSwitcher = m_switcher;
m_changed = true;
m_switcher = value;
}
}
}
public static void ScreenSwitchPlus() {
switcher += 1;
}
public static void ScreenSwitchMinus() {
switcher -= 1;
}
private void Update() {
if ( m_changed ) {
UpdateCS();
m_changed = false;
}
}
void UpdateCS() {
if ( m_lastSwitcher < Screen.Count ) {
var canvasBtns = Screen[ m_lastSwitcher ].CanvasButtons;
for ( int i = 0; i < canvasBtns.Count; i++ ) {
canvasBtns[ i ].SetActive( false );
}
}
if ( switcher < Screen.Count ) {
var canvasBtns = Screen[ switcher ].CanvasButtons;
for ( int i = 0; i < canvasBtns.Count; i++ ) {
canvasBtns[ i ].SetActive( true );
}
}
}
}