ScrollView 中的项目在场景中看不到，但它显示在层次结构中

Question

我正在尝试显示一个动态生成的列表。我创建了一个包含我需要的东西的预制件（一个 TextView、3 个 TMP_InputFields 和 2 个按钮。）

为了管理不同的列表项，我创建了一个脚本（SkillManager，因为这些项代表玩家可以选择的技能），我将其附加到预制件中。

然后，我将每个项目（目前我只添加一个用于测试目的）添加到列表中，迭代该列表，并将预制添加到 ScrollView 的内容：

for(int i = 0; i < listaSkills.Count; i++)
    {
        GameObject listItem = Instantiate(SkillPrefab) as GameObject;
        listItem.GetComponent<SkillManager>().skill = listaSkills[i];
        //listItem.transform.SetParent(SkillsContent.transform, false);
        listItem.transform.parent = SkillsContent.transform;
    }

当我运行它时，在 ScrollView 中看不到任何项目，但我可以看到 SkillItem 添加到层次结构中：

如果我在播放后移动到场景选项卡，我会看到一个带有红线的正方形：

为什么我的商品没有显示？为什么是红十字？如何填充我的 ScrollView？

编辑：

这是 SkillManager 的代码，添加到 SkillPrefab 的脚本：

public class SkillManager : MonoBehaviour
{
public TMP_InputField toSpend;
public TMP_InputField rangos;
public TMP_InputField modificadores;
public TMP_InputField total;
public Button plusButton;
public Button minusButton;
public TMP_Text nombre;
public Skill skill;
private int modificador;
private int pointsToSpend;
private int totalPoints;

// Start is called before the first frame update
void Start()
{
    print("Start");
    if(total!=null)
    total.text = "0";
    if(modificadores!=null)
    modificadores.text = "0";
    if (toSpend != null)
    {
        toSpend.GetComponent<TMP_InputField>().text = GetSkillPoints();
        totalPoints = int.Parse(total.GetComponent<TMP_InputField>().text);
        pointsToSpend = int.Parse(toSpend.GetComponent<TMP_InputField>().text);
    }
    else
    {
        GameObject GameObjectToSpend = GameObject.FindGameObjectWithTag("tospend");
        toSpend = GameObjectToSpend.GetComponent<TMP_InputField>();
        if (toSpend == null)
        {
            print("Sigue siendo nulo");
        }
        else
        {
            toSpend.text= GetSkillPoints();

            //totalPoints = int.Parse(total.GetComponent<TMP_InputField>().text);
            if(total!=null)
            totalPoints = int.Parse(total.text);
            if(toSpend!=null)
            pointsToSpend = int.Parse(toSpend.text);
        }
    }
    if (skill != null)
    {
        modificador = GetModificador(skill);
        string sModificador = modificadores.GetComponent<TMP_InputField>().text;
        int iModificador = int.Parse(sModificador);
        modificadores.GetComponent<TMP_InputField>().text = iModificador.ToString();
    }

    if (plusButton != null)
    {
        plusButton.onClick.AddListener(PlusButtonClicked);
        minusButton.onClick.AddListener(MinusButtonClicked);
    }
    
}

private string GetSkillPoints()
{
    return "1";
}

public void MinusButtonClicked()
{
    string ranks = rangos.GetComponent<TMP_InputField>().text;
    int ranksInt = int.Parse(ranks);
    if (ranksInt > 0)
    {
        int newRank = ranksInt - 1;
        pointsToSpend += 1;
        rangos.GetComponent<TMP_InputField>().text = newRank.ToString();
        toSpend.GetComponent<TMP_InputField>().text = pointsToSpend.ToString();
        total.GetComponent<TMP_InputField>().text = (newRank + modificador).ToString();
        skill.Puntos = newRank;
    }
}

public void PlusButtonClicked()
{
    
    string ranks=rangos.GetComponent<TMP_InputField>().text;
    int ranksInt = int.Parse(ranks);
    Character character = Almacen.instance.Character;
    int level = character.CharacterLevel;
    if (ranksInt < level && pointsToSpend > 0)
    {
        int newRank = ranksInt + 1;
        rangos.GetComponent<TMP_InputField>().text = newRank.ToString();
        pointsToSpend -= 1;
        toSpend.GetComponent<TMP_InputField>().text = pointsToSpend.ToString();
        total.GetComponent<TMP_InputField>().text = (newRank + modificador).ToString();
        skill.Puntos = newRank;
    }
}

private int GetModificador(Skill skill)
{
    int retorno=0;
    if (skill.Clasea)
    {
        retorno += 3;
    }
    else
    {
        retorno += 0;
    }
    retorno += GetModificadorCaracteristica();
    return retorno;
}

private int GetModificadorCaracteristica()
{
    Utils utils = new Utils();
    int retorno = 0;
    int characteristic=0;
    switch (skill.Caracteristica)
    {
        case "Fue":
            characteristic = Almacen.instance.Character.EffectiveStr;
            break;
        case "Des":
            characteristic = Almacen.instance.Character.EffectiveDex;
            break;
        case "Con":
            characteristic = Almacen.instance.Character.EffectiveCon;
            break;
        case "Int":
            characteristic = Almacen.instance.Character.EffectiveInt;
            break;
        case "Sab":
            characteristic = Almacen.instance.Character.EffectiveWis;
            break;
        case "Car":
            characteristic = Almacen.instance.Character.EffectiveCha;
            break;

    }
    retorno = utils.GetCharModifier(characteristic);
    return retorno;
}
}

Answer 1

看起来您将对象实例化为 GameObject。但这不会在画布中看到，因为它不是 UI 组件。您可能希望向组件添加精灵或图像并将其实例化到 Canvas 中。它看起来像这样：

public class SkillPrefab
{
    //put all your variables here!!!

    public Sprite skillSprite;
}


public class YourClassName : MonoBehaviour
{
    [SerializeField]
    public List<SkillPrefab> skills = new List<SkillPrefab>();

    private void Update()
    {

        Sprite listItem = Instantiate(skills[0].skillSprite);  //the index is the skill you want to spawn in the list.
    }
}

这确实考虑到您已将您的技能列入您可以获取的技能列表。