背景：

        需要界面实现动态国际化，一键点击切换中英文或其他语言。

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前提：

        已经完成了整个界面的翻译，拿到匹配的ts翻译文件，注意：要保证界面切换后，翻译的全覆盖，要保证任何需要反应的地方，都用到了tr("")包含，不然Linguist会捕捉不到。.ts文件的生成参考下文。

Qt中英文切换（国际化）_雲烟的博客-CSDN博客

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工具：

假设已经拿到a.qm b.qm c.qm三个翻译文件

#include <QtCore/QObject>
#include <QtCore/QTranslator>class LanguageManager:public QObject{Q_OBJECTpublic:~LanguageManager() override = default;void setLanguage(const QString &language);QString getLanguage();void addLangFile(const QString &name);void removeLangFile(const QString &name);void reload();static LanguageManager *getInstance(){if(!instance){instance = new LanguageManager;}return instance;}signals:void languageChanged(const QString &lang);privite:LanguageManager();privite:static LanguageManager *instance;QString baseDir;QList<QString> langFiles;QList<QTranslator *> translations;
}

#include "Languagemanager.h"
#include <QApplication>
#include <QCoreApplication>
#include <QDebug>
#include <QStringBuilder>
#include <configFile.h>LanguageManager *LanguageManager::instance = nullptr;void LanguageManager::setLanguage(const QString &language)
{//写配置文件保存SystemConfig sc;auto ov = sc.value("qt/language");sc.setValue("qt/language",language);if(ov!=language){reload();emit languageChanged(language);}
}QString LanguageManager::getLanguage()
{SystemConfig sc;return sc.value("qt/language").toString();
}void LanguageManager::addLangFile(const QString &name)
{if(name.isEmpty()){return;}langFiles.append(name);
}void LanguageManager::removeLangFile(const QString &name)
{if(name.isEmpty()){return;}langFiles.removeOne(name);
}void LanguageManager::reload()
{auto lang = getLanguage();QString qmBase = QApplication::applicationDirPath() + "/" + baseDir;if(!qmbase.isEmpty() && !qmBase.endsWith("/")){qmBase += "/";}if(!translations.isEmpty()){for(auto const t:translations){QCoreApplication::removeTranslator(t);t->deleteLater();}translations.clear();}for(auto const &qm:langFiles){auto *t = new QTranslator(this);if(t->load(qmBase % qm % "_" % lang)){translations.append(t);QCoreApplication::installTranslator(t);}else{qDebug()<<"load error:"<<qm<<", language"<<lang;}}
}LanguageManager::LanguageManager (): baseDir("lang"){}

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使用：

        在界面切换的按键或者条目里直接调用即可：

LanguageManager::getInstance()->setLanguage("english");

        注意：该调用界面要重载changeEvent（）保证界面即刻生效。

protected:void changeEvent(QEvent *evt) override ;void MainPanel::changeEvent(QEvent *evt) {if (evt->type() == QEvent::LanguageChange) {ui->retranslateUi(this);}QWidget::changeEvent(evt);
}

至此，界面即可看到变化，中英文动态切换完成！