Qt实现多国语言（即界面翻译）可实时进行切换

.在工程文件添加
TRANSLATIONS = debug/lang_English.ts \
debug/lang_Chinese.ts.在需要翻译的地方用上tr
例如：setText(tr("hello world"));.提供一个更改语言的接口
void MainWindow::changeTr(int language).重载void changeEvent(QEvent *e); 对语言改变事件进行处理.利用qt语言家更新翻译，手工翻译生成的.ts文件之后，再进行发布翻译

//mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include <QLabel>namespace Ui {
class MainWindow;
}class MainWindow : public QMainWindow
{
Q_OBJECTpublic:
explicit MainWindow(QWidget *parent = );
~MainWindow(); void changeEvent(QEvent *e); void changeTr(int language_label);private:
Ui::MainWindow *ui;
QLabel *label,*label1;
};#endif // MAINWINDOW_H

//mainwindows.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QLabel>
#include <QTranslator>
#include <QDebug>MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
label = new QLabel(this);
label1 = new QLabel(this); label->setText(tr("hello world"));
label1->setText(tr("hello")); label1->move(label->x(),label->y()+label->height()); ui->setupUi(this);}MainWindow::~MainWindow()
{
delete ui;
}void MainWindow::changeTr(int language_label)
{
QString qmFilename;
static QTranslator* translator;
if (translator != NULL)
{
qApp->removeTranslator(translator);
delete translator;
translator = NULL;
}
translator = new QTranslator(this); QString runPath = QCoreApplication::applicationDirPath(); //获取文件运行路径
qDebug() << runPath;
if(language_label==)
{
qmFilename = runPath + "/lang_Chinese.qm";
}
else
{
qmFilename = runPath + "/lang_English.qm";
}
qDebug() << qmFilename;
if (translator->load(qmFilename))
{
qDebug() << "installTranslator";
qApp->installTranslator(translator);
}
// ui->retranslateUi(this); // 重新设置界面显示
}void MainWindow::changeEvent(QEvent *e)
{
// MainWindow::changeEvent(e);
switch (e->type())
{
case QEvent::LanguageChange:
qDebug() << "changeEvent" << e->type();
label->setText(tr("hello world"));
label1->setText(tr("hello"));
ui->retranslateUi(this);
break;
default:
break;
}
}

//main.cpp
#include "mainwindow.h"
#include <QApplication>
#include <QThread>
#include "stdlib.h"int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;// w.changeTr(1); w.show();
w.changeTr(); return a.exec();
}