Qt 国际语言切换

1.建立一个QWidget 工程

2. 修改 .pro 文件
   添加了两句, 后面可生成两个 xxx.ts

   
   
3. 编写代码, 对需要转换成国际文字的内容全用

QLabel* pTestLabel;
pTestLabel  = new QLabel;
pTestLabel->setText(tr("这里的显示的文字会转换"));

4.生成 xxx.ts文件

我的项目会生成两个 ***.ts

5. ***.ts去转换成 ***.qm
   打开 linguist,
   这东西在/opt/Qt.x.x.x/Qt.x.x.x/gcc_64/bin里面(windos系统,直接在"开始"找qt就有了)

   
   
   

保存生成 ***.qm文件

6.加载 ***.qm

QTranslator pTranslate = new QTranslator(this);
pTranslate->load("执行文件,当前目录下的 ***.qm");

7. 安装翻译

qApp->installTranslator(pTranslate);

步骤3.(重新执行一遍,Text的内容就会转到对应 ***.qm指定的文字)
pTestLabel->setText(tr("这里的显示的文字会转换"));

**如果你是有ui的.
直接ui->retranslateUi(this)一键把你的ui里面的文字重新设置一遍,这个操作你也可以自己写个函数封装

Demo:

main.cpp

#include "widget.h"
#include <QApplication>
#include "translatewidget.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
//    TranslateWidget w;
    w.show();

    return a.exec();
}

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QApplication>
#include <QWidget>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QRadioButton>
#include <QButtonGroup>
#include <QHBoxLayout>
#include <QTranslator>

#include "translatewidget.h"


class Widget : public QWidget
{
    Q_OBJECT
public:
    Widget(QWidget *parent = 0);
    ~Widget();
public:
    void CreateControl();
    void InitControl();
    void ConnectControl();
    void UpSetText();
public slots:
    void OnChangeLanguage();
    void OnTranslate();
private:
    QLabel* m_pLoginLabel;
    QLabel* m_pPasswordLabel;

    QLineEdit* m_pLoginLineEdit;
    QLineEdit* m_pPasswordLineEdit;

    QPushButton* m_pLoginButton;
    QPushButton* m_pCancelButton;
    QPushButton* m_pLanguageButton;

    QHBoxLayout* m_pLoginLabelHLayout;
    QHBoxLayout* m_pPasswordLabelHLayout;
    QHBoxLayout* m_pLoginButtonHLayout;
    QVBoxLayout* m_pMainVLayout;

    TranslateWidget* m_ptranslateWidget;
};

#endif // WIDGET_H

widget.cpp

#include "widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    setGeometry(200,200,400, 200);
    CreateControl();
    InitControl();
    ConnectControl();
}

Widget::~Widget()
{

}

void Widget::CreateControl()
{
    m_ptranslateWidget = new TranslateWidget();

    m_pLoginLabel = new QLabel();
    m_pPasswordLabel = new QLabel();

    m_pLoginLineEdit = new QLineEdit();
    m_pPasswordLineEdit = new QLineEdit();

    m_pLoginButton = new QPushButton();
    m_pCancelButton = new QPushButton();
    m_pLanguageButton = new QPushButton();

    m_pLoginLabelHLayout = new QHBoxLayout();
    m_pPasswordLabelHLayout = new QHBoxLayout();
    m_pLoginButtonHLayout = new QHBoxLayout();
    m_pMainVLayout = new QVBoxLayout(this);
}
void Widget::InitControl()
{
    m_ptranslateWidget->setGeometry(0,0,300,80);
    m_ptranslateWidget->hide();

    m_pLoginLabel->setText(tr("用户: "));
    m_pPasswordLabel->setText(tr("密码: "));
    m_pLoginButton->setText(tr("登录"));
    m_pCancelButton->setText(tr("取消"));
    m_pLanguageButton->setText(tr("语言切换"));

    m_pLoginLabelHLayout->addWidget(m_pLoginLabel);
    m_pLoginLabelHLayout->addWidget(m_pLoginLineEdit);

    m_pPasswordLabelHLayout->addWidget(m_pPasswordLabel);
    m_pPasswordLabelHLayout->addWidget(m_pPasswordLineEdit);

    m_pLoginButtonHLayout->addStretch();
    m_pLoginButtonHLayout->addWidget(m_pLoginButton);
    m_pLoginButtonHLayout->addWidget(m_pCancelButton);

    m_pMainVLayout->addWidget(m_pLanguageButton);
    m_pMainVLayout->addLayout(m_pLoginLabelHLayout);
    m_pMainVLayout->addLayout(m_pPasswordLabelHLayout);
    m_pMainVLayout->addLayout(m_pLoginButtonHLayout);

    setLayout(m_pMainVLayout);
}
void Widget::ConnectControl()
{
    connect(m_pLanguageButton, SIGNAL(clicked()), this, SLOT(OnChangeLanguage()));
    connect(m_ptranslateWidget, SIGNAL(SignalTranslate()), this, SLOT(OnTranslate()));
}
void Widget::UpSetText()
{
    m_pLoginLabel->setText(tr("用户: "));
    m_pPasswordLabel->setText(tr("密码: "));
    m_pLoginButton->setText(tr("登录"));
    m_pCancelButton->setText(tr("取消"));
    m_pLanguageButton->setText(tr("语言切换"));
    qDebug("UpSetText");
}
void Widget::OnChangeLanguage()
{
    m_ptranslateWidget->show();
}
void Widget::OnTranslate()
{
    UpSetText();
}

tranlatewidget.h

#ifndef TRANSLATEWIDGET_H
#define TRANSLATEWIDGET_H

#include <QWidget>
#include <QApplication>
#include <QTranslator>
#include <QRadioButton>
#include <QButtonGroup>
#include <QHBoxLayout>
#include <QLabel>

class TranslateWidget : public QWidget
{
    Q_OBJECT
public:
    explicit TranslateWidget(QWidget *parent = nullptr);

public:
    void CreateControl();
    void InitControl();
    void ConnectControl();
    void UpSetText();
signals:
    void SignalTranslate();
public slots:
    void OnTranslate(int p_pID);
private:
    QTranslator* m_pTranslate;

    QLabel* m_pLanguageLabel;

    QRadioButton* m_pEnglishButton;
    QRadioButton* m_pChineseBUtton;
    QButtonGroup* m_pLanguageButtonGroup;

    QHBoxLayout* m_pLanguageLabelHLayout;
};

#endif // TRANSLATEWIDGET_H

translatewidget.cpp

#include "translatewidget.h"

TranslateWidget::TranslateWidget(QWidget *parent) : QWidget(parent)
{
//    setGeometry(0,0,400, 80);
    CreateControl();
    InitControl();
    ConnectControl();
}
void TranslateWidget::CreateControl()
{
    m_pTranslate = new QTranslator(this);

    m_pLanguageLabel = new QLabel();

    m_pEnglishButton = new QRadioButton();
    m_pChineseBUtton = new QRadioButton();
    m_pLanguageButtonGroup = new QButtonGroup();

    m_pLanguageLabelHLayout = new QHBoxLayout(this);
}
void TranslateWidget::InitControl()
{
    m_pLanguageLabel->setText(tr("语言: "));
    m_pEnglishButton->setText("Englisg");
    m_pChineseBUtton->setText("中文");
    m_pChineseBUtton->setChecked(true);

    m_pLanguageButtonGroup->addButton(m_pChineseBUtton, 0);
    m_pLanguageButtonGroup->addButton(m_pEnglishButton, 1);

    m_pLanguageLabelHLayout->addStretch();
    m_pLanguageLabelHLayout->addWidget(m_pLanguageLabel);
    m_pLanguageLabelHLayout->addWidget(m_pChineseBUtton);
    m_pLanguageLabelHLayout->addWidget(m_pEnglishButton);

    hide();
    setLayout(m_pLanguageLabelHLayout);
}
void TranslateWidget::ConnectControl()
{
    connect(m_pLanguageButtonGroup, SIGNAL(buttonClicked(int)), this, SLOT(OnTranslate(int)));
}
void TranslateWidget::UpSetText()
{
    m_pLanguageLabel->setText(tr("语言: "));
    m_pEnglishButton->setText("Englisg");
    m_pChineseBUtton->setText("中文");
}

void TranslateWidget::OnTranslate(int p_pID)
{
    switch (p_pID) {
    case 0:
        m_pTranslate->load("Translate_CN.qm");
        break;
    case 1:
        m_pTranslate->load("Translate_EN.qm");
        break;
    default:
        break;
    }
    qApp->installTranslator(m_pTranslate);
    SignalTranslate();
    UpSetText();
}