背景：

多个子项目，分别翻译生成的qm文件，如何一键加载？

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.h

#include <QtCore/QObject>
#include <QtCore/QTranslator>class LanguageSelector:public QObeject{Q_OBJECT
public:~LanguageSelector() override = default;void setLanguage(const QString &l);QString getLanguage();void addLanguageFile(const QString &n);void removeLanguageFile(const QString &n);void reload();static LanguageSelector *getInstance();
signals:void languageChanged(const QString &l);
privite:LanguageSelector();static LanguageSelector* instance;static constexpr char CONFIGER_KEY[] = "system/language";QString baseDir;QList<QString> languageFiles;QList<QTranslator *> translations;
}

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.cpp

#include "languageselector.h"
#include <QApplication>
#include <QCoreApplication>
#include <QDebug>
#include <QStringBuilder>
#include <QSettings>LanguageSelector *LanguageSelector::instance = nullptr;
constexpr char LanguageSelector::CONFIGER_KEY[];
QString LanguageSelector::getLanguage()
{return QSettings::value( CONFIGER_KEY, defaultValue );
}void LanguageSelector::setLanguage(const QString &language)
{QSettings qs;auto ov = QSettings::value( CONFIGER_KEY, defaultValue );qs::setValue( CONFIGER_KEY, language);if(ov != l){reload();emit languageChanged( language);}
}LanguageSelector *LanguageSelector::getInstance()
{if(!instance){instance = new LanguageSelector;}return instance;
}LanguageSelector::LanguageSelector(): baseDir( "i18n" ) {}void LanguageSelector::addLanguageFile(const QString &name)
{if(name.isEmpty()){return;}languageFiles.append(name);
}void LanguageSelector::removeLanguageFile(const QString &name)
{if(name.isEmpty()){return;}languageFiles.removeOne(name);
}void LanguageSelector::reload()
{auto language = getLanguage();QString qmBase = QApplication::applicationDirPath() + "/" + baseDir;if(!qmBase.isEmpty() && !qmBase.endWith("/")){qmBase += "/";}if(!translations.isEmpty()){for(auto const t : translations){QCoreApplication::removeTranslator(t);t->deleteLater();}}for(auto const &qm ：languageFiles){auto *t = new QTranslator(this);if(t->load(qmBase % qm % "_" % language ))translations.append(t);QCoreApplication::installTranslator(t);}else{qDebug() << "can not load lang file:" << qm << ", language" << language ;}
}

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使用：

main中，节目构造之前添加：

      auto ls = LanguageSelector::getInstance();ls->addLangFile( "test" );ls->addLangFile( "local" );ls->addLangFile( "remote" );ls->reload();