一、.pro文件中添加支持的语言

在.pro文件中添加下面几句，支持中文和英文

TRANSLATIONS = lanague_cn.ts\lanague_en.ts

二、通过qt语言家更新翻译生成.ts文件

完成以后在工程目录可以看到.ts文件

三、通过linguist翻译文件

打开文件

将两个文件同时选中，打开。

四、Qt语言家发布文字生成.qm文件

五、使用翻译文件进行多语言切换

为了方便多窗口同时切换，使用单例类进行，源码如下：

languageHelper.h

#ifndef LANGUAGEHELPER_H
#define LANGUAGEHELPER_H#include <QObject>
#include <QMutex>
#include <QTranslator>
#include <QApplication>class LanguageHelper : public QObject
{Q_OBJECT
public:enum language {chinese,english,undefined};
signals:void languageChaned();
private:explicit LanguageHelper();~LanguageHelper();LanguageHelper(LanguageHelper&) = delete;LanguageHelper operator=(const LanguageHelper &) = delete;public:static LanguageHelper *getInstance(){static QMutex mutex;mutex.lock();if(languageHelper == nullptr){languageHelper = new LanguageHelper();}mutex.unlock();return languageHelper;}static void quit();bool changeLanguage(language l);private:static LanguageHelper *languageHelper;QTranslator* translator = nullptr;language currentLanguage = language::undefined;
};#endif // LANGUAGEHELPER_H

languageHelper.cpp

#include "languageHelper.h"LanguageHelper *LanguageHelper::languageHelper = nullptr;LanguageHelper::LanguageHelper()
{this->translator = new QTranslator();}LanguageHelper::~LanguageHelper()
{if(this->translator){delete this->translator;this->translator = nullptr;}qDebug()<<"~LanguageHelper";
}void LanguageHelper::quit()
{if(languageHelper)delete languageHelper;
}bool LanguageHelper::changeLanguage(language l)
{if(l == this->currentLanguage || l == language::undefined)return true;bool ret = false;switch(l){case chinese:{if (this->translator != nullptr)qApp->removeTranslator(this->translator);ret = this->translator->load("E:/CompanyProjects/KPMG/winccTemp/language/Language/lanague_cn.qm");if (ret){bool install = qApp->installTranslator(this->translator);if (install == false)return false;}elsereturn false;}break;case english:{if (this->translator != nullptr)qApp->removeTranslator(this->translator);ret = this->translator->load("E:/CompanyProjects/KPMG/winccTemp/language/Language/lanague_en.qm");if (ret){bool install = qApp->installTranslator(this->translator);if (install == false)return false;}elsereturn false;}break;case undefined:{}break;}if (ret) {this->currentLanguage = l;emit languageChaned();}
}

通过按钮切换语言：

void MainWindow::on_btnChinese_clicked()
{LanguageHelper::getInstance()->changeLanguage(LanguageHelper::chinese);
}void MainWindow::on_btnEnglish_clicked()
{LanguageHelper::getInstance()->changeLanguage(LanguageHelper::english);
}

需要注意的是，在需要实时翻译的界面需要实现languageChaned信号的绑定，然后调用ui->retranslateUi(this);函数，如下：

    connect(LanguageHelper::getInstance(),&LanguageHelper::languageChaned,this,[=](){ui->retranslateUi(this);});