qt语言国际化（翻译），并实现多窗口同时翻译 - mkmkbj

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
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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
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#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
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languageHelper.cpp
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#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;

}

else

return 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;

}

else

return false;

}break;

case undefined:

{
}break;

}

if (ret) {

this->currentLanguage = l;

emit languageChaned();

}

}
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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);

}
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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);
            });
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