yichael_smartbow/Assets/BowArrow/Scripts/Components/TextAutoLanguage2/TextAutoLanguage2.cs

using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using Newtonsoft.Json;

public class TextAutoLanguage2 : MonoBehaviour
{
    [SerializeField] string textKey;
    [SerializeField] RectTransform layoutRebuildObject;
    static LanguageEnum currentLanguageEnum = LanguageEnum.Chinese;
    static Dictionary<string, string> languageDictionary = null;
    static HashSet<TextAutoLanguage2> textAutoLanguages = new HashSet<TextAutoLanguage2>();
    public object[] textFormatArgs = {};
    [SerializeField] LanguageFontSize[] languageFontSizes = {};

    private static bool inited = false;
    public static void Init()
    {
        if (inited) return;
        inited = true;
        int id = PlayerPrefs.GetInt("Language", 0);
        ChangeLanguage((LanguageEnum) id);
    }

    public static void ChangeLanguage(LanguageEnum languageEnum) 
    {
        string fileName = "cn";
        if (languageEnum == LanguageEnum.English) fileName = "en";
        languageDictionary = JsonConvert.DeserializeObject<Dictionary<string, string>>(Resources.Load<TextAsset>("TextAutoLanguage2/" + fileName).text);
        currentLanguageEnum = languageEnum;
        PlayerPrefs.SetInt("Language", ((int)languageEnum));
        foreach (var textAutoLanguage in textAutoLanguages)
        {
            try {
                textAutoLanguage.ApplyToText();    
            } catch (Exception e) { Debug.LogError(e.Message); }
        }
    }

    public static LanguageEnum GetLanguage()
    {
        return currentLanguageEnum;
    }

    public static string GetTextByKey(string textKey) {
        Init();
        return languageDictionary[textKey];
    }

    public static string GetTextByCNKey(string textKey) {
        Init();
        if (currentLanguageEnum == LanguageEnum.Chinese) {
            return textKey;
        }
        string resText = null;
        languageDictionary.TryGetValue(textKey, out resText);
        if (resText == null) {
            return textKey;
        }
        return resText;
    }

    void Awake()
    {
        Init();
    }

    void Start()
    {
        textAutoLanguages.Add(this);
        ApplyToText();   
    }

    void OnDestroy()
    {
        textAutoLanguages.Remove(this);
    }

    /**记录组件的默认字体大小 */
    private int defaultFontSize = -1;
    public void SetTextKey(string textKey)
    {
        this.textKey = textKey;
        string text = languageDictionary[textKey];
        if (textFormatArgs.Length > 0)
        {
            text = String.Format(text, textFormatArgs);
        }
        Text textComp = GetComponent<Text>();
        textComp.text = text;
        //如果有指定当前语言的字体大小，就更新字体大小，否则恢复默认字体大小
        if (defaultFontSize == -1) { //首次记录组件的默认字体大小
            defaultFontSize = textComp.fontSize;
        } else {
            textComp.fontSize = defaultFontSize;
        }
        if (languageFontSizes.Length > 0) {
            foreach (var languageFontSize in languageFontSizes)
            {
                if (languageFontSize.language == currentLanguageEnum) {
                    textComp.fontSize = languageFontSize.fontSize;
                    break;
                }
            }
        }
        //重置指定节点的布局
        if (layoutRebuildObject)
        {
            LayoutRebuilder.ForceRebuildLayoutImmediate(layoutRebuildObject);
        }
    }

    public string GetTextKey()
    {
        return this.textKey;
    }

    public void ApplyToText()
    {
        SetTextKey(textKey);
    }
}
[Serializable]
public class LanguageFontSize {
    public LanguageEnum language;
    public int fontSize;
}
public enum LanguageEnum {
    Chinese, English
}