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<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span><span class="token punctuation">(</span>languageHelper <span class="token operator">==</span> <span class="token keyword">nullptr</span><span class="token punctuation">)</span>
<span class="token punctuation">{<!-- --></span>
languageHelper <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token function">LanguageHelper</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
mutex<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> languageHelper<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">quit</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">bool</span> <span class="token function">changeLanguage</span><span class="token punctuation">(</span>language l<span class="token punctuation">)</span><span class="token punctuation">;</span>
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;
<span class="token punctuation">}</span><span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> english<span class="token operator">:</span>
<span class="token punctuation">{<!-- --></span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token operator">-></span>translator <span class="token operator">!=</span> <span class="token keyword">nullptr</span><span class="token punctuation">)</span>
qApp<span class="token operator">-></span><span class="token function">removeTranslator</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token operator">-></span>translator<span class="token punctuation">)</span><span class="token punctuation">;</span>
ret <span class="token operator">=</span> <span class="token keyword">this</span><span class="token operator">-></span>translator<span class="token operator">-></span><span class="token function">load</span><span class="token punctuation">(</span><span class="token string">"E:/CompanyProjects/KPMG/winccTemp/language/Language/lanague_en.qm"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>ret<span class="token punctuation">)</span>
<span class="token punctuation">{<!-- --></span>
<span class="token keyword">bool</span> install <span class="token operator">=</span> qApp<span class="token operator">-></span><span class="token function">installTranslator</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token operator">-></span>translator<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>install <span class="token operator">==</span> <span class="token boolean">false</span><span class="token punctuation">)</span>
<span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">else</span>
<span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> undefined<span class="token operator">:</span>
<span class="token punctuation">{<!-- --></span>
<span class="token punctuation">}</span><span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>ret<span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
<span class="token keyword">this</span><span class="token operator">-></span>currentLanguage <span class="token operator">=</span> l<span class="token punctuation">;</span>
emit <span class="token function">languageChaned</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
}
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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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