1.在工程文件添加
TRANSLATIONS = debug/lang_English.ts \debug/lang_Chinese.ts2.在需要翻译的地方用上tr
例如：setText(tr("hello world"));3.提供一个更改语言的接口
void MainWindow::changeTr(int language)4.重载void changeEvent(QEvent *e); 对语言改变事件进行处理5.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 = 0);~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==1){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(1);return a.exec();
}