JSON不适用于iOS应用Unity 5

Question

我正在 Unity 上开发 iOS 应用程序，但遇到了问题。 对于数据存储，我使用 JSON，在 Unity 中我使用 Newtonsoft.Json（我从官方网站下载 dll 文件并添加到 .Net 2.0 的 Unity 项目版本）。

当我在 Mac 上的 Unity 中启动场景时一切正常，但是当我为 iPhone 构建项目并在 iPhone XCode 上启动场景时输出此日志（并且元素不会添加到下拉菜单）。

在来自 json 文件的场景中，我得到了我的元素列表并添加到下拉列表中。

public Dropdown anions;
public Dropdown cations;

StreamReader reader;
string json;
SolubilityTable solubility;

public void Start() { //When I start Scene
    reader = new StreamReader (Application.dataPath + "/Data/solubilityTable.json");
    json = reader.ReadToEnd ();
    solubility = JsonConvert.DeserializeObject<SolubilityTable>(json);

    anions.AddOptions (solubility.anions);
    cations.AddOptions (solubility.cations);
}

日志：

MissingMethodException: Method not found: 'Default constructor not     found...ctor() of System.ComponentModel.TypeConverter'.
  at System.Activator.CreateInstance (System.Type type, Boolean     nonPublic) [0x00000] in <filename unknown>:0 
  at System.Activator.CreateInstance (System.Type type) [0x00000] in     <filename unknown>:0 
  at System.ComponentModel.TypeDescriptor.GetConverter (System.Type     type) [0x00000] in <filename unknown>:0 
  at Newtonsoft.Json.Serialization.JsonTypeReflector.GetTypeConverter     (System.Type type) [0x00000] in <filename unknown>:0 
  at Newtonsoft.Json.Utilities.ConvertUtils.GetConverter (System.Type     t) [0x00000] in <filename unknown>:0 
  at Newtonsoft.Json.Serialization.DefaultContractResolver.CanConvertToString     (System.Type type) [0x00000] in <filename unknown>:0 
  at Newtonsoft.Json.Serialization.DefaultContractResolver.CreateContract (System.Type objectType) [0x00000] in <filename unknown>:0 
  at Newtonsoft.Json.Serialization.DefaultContractResolver.ResolveContract (System.Type type) [0x00000] in <filename unknown>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.GetContractSafe (System.Type type) [0x00000] in <filename unknown>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize (Newtonsoft.Json.JsonReader reader, System.Type objectType, Boolean checkAdditionalContent) [0x00000] in <filename unknown>:0 
  at Newtonsoft.Json.JsonSerializer.DeserializeInternal (Newtonsoft.Json.JsonReader reader, System.Type objectType) [0x00000] in <filename unknown>:0 
  at Newtonsoft.Json.JsonSerializer.Deserialize (Newtonsoft.Json.JsonReader reader, System.Type objectType) [0x00000] in <filename unknown>:0 
  at Newtonsoft.Json.JsonConvert.DeserializeObject (System.String value, System.Type type, Newtonsoft.Json.JsonSerializerSettings settings) [0x00000] in <filename unknown>:0 
  at Newtonsoft.Json.JsonConvert.DeserializeObject[T] (System.String value, Newtonsoft.Json.JsonSerializerSettings settings) [0x00000] in <filename unknown>:0 
  at Newtonsoft.Json.JsonConvert.DeserializeObject[T] (System.String value) [0x00000] in <filename unknown>:0 
  at Solubility.Start () [0x00000] in <filename unknown>:0 

(Filename: currently not available on il2cpp Line: -1)

Answer 1

使用 Unity 的 Jason API JsonUtility.FromJson。

[System.Serializable]
public class Element
{
    public string group;
    public int position;
    public string name;
    public object number;
    public string small;
    public double molar;
    public int[] electrons;
}

[System.Serializable]
public class Table
{
    public string wiki;
    public Element[] elements;
}

[System.Serializable]
public class Lanthanoid
{
    public string group;
    public int position;
    public string name;
    public int number;
    public string small;
    public double molar;
    public int[] electrons;
}

[System.Serializable]
public class Actinoid
{
    public string group;
    public int position;
    public string name;
    public int number;
    public string small;
    public double molar;
    public int[] electrons;
}

[System.Serializable]
public class SolubilityTable
{
    public Table[] table;
    public Lanthanoid[] lanthanoids;
    public Actinoid[] actinoids;
}

System.IO.StreamReader reader;
string json;
SolubilityTable solubility;

void Start()
{
    solubility = new SolubilityTable();
    reader = new System.IO.StreamReader(Application.dataPath + "/Data/solubilityTable.json");
    json = reader.ReadToEnd();
    solubility = JsonUtility.FromJson<SolubilityTable>(json);


    //Show all wiki from Table
    for (int i = 0; i < solubility.table.Length; i++)
    {
        Debug.Log("Got: " + solubility.table[i].wiki);
    }
}

实用提示：

当您遇到此类问题时，还可以考虑使用此site 从 Json 生成类。完成后，只需将所有Lists 更改为arrays 并从所有变量中删除自动属性{ get; set; }。 Unity 内置的 Json 序列化器将工作。使用 5.40.B13 测试，如果您有任何问题，我建议您更新到此版本。