说明

程序应用场景：window电脑,Linux电脑直接调用系统键盘，嵌入式触摸屏开发板，需要自己写不能直接调用，涉及代码量较多，不在这里进行举例说明，可直接下载源代码例子。这是我很久以前写的例子了，就可能会有很多问题，现在更改过的我又懒得打包。

 int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
     a.setAutoSipEnabled(true); // 自动弹出系统软键盘
     TestAnn w;
     w.showMaximized();
     return a.exec();
 }

中文键盘
数字键盘

触摸屏点击LineEdit弹出键盘需要重写QLineEdit类，下面是键盘弹出回传数据显示部分代码展示

/******弹出字母键盘********/
void MainWindow::lineEditClickedVirtualkeyboard()
{
    QLineEdit* lineedit = (QLineEdit*)sender();  // 获取到了发送该信号按钮的指针
    lineeditname = lineedit->objectName();
    lineedit->setStyleSheet("background-color: rgb(252, 233, 79); border-style: outset;border-width: 2px;border-radius:10px; border-color: rgb(52, 101, 164);min-width:2em;padding: 5px;");
    VirtualKeyboard *v = new VirtualKeyboard;
    connect(this,SIGNAL(sendData(QString)),v,SLOT(reciverData(QString)));
    emit sendData(NULL);
    v->setWindowModality(Qt::ApplicationModal);
//    v->setWindowModality(Qt::WindowModal);
//    v->setWindowFlags(Qt::WindowStaysOnTopHint);
    v->show();
}
/******弹出数字键盘*********/
void MainWindow::lineEditClickedDigitalkeyboard()
{
    QLineEdit* lineedit = (QLineEdit*)sender();  // 获取到了发送该信号按钮的指针
    lineeditname = lineedit->objectName();
    lineedit->setStyleSheet("background-color: rgb(252, 233, 79); border-style: outset;border-width: 2px;border-radius:10px; border-color: rgb(52, 101, 164);min-width:2em;padding: 5px;");
    DigitalKeyboard *v = new DigitalKeyboard;
    connect(this,SIGNAL(sendData(QString)),v,SLOT(reciverData(QString)));
    emit sendData(NULL);
    v->setWindowModality(Qt::ApplicationModal);
//    v->setWindowModality(Qt::WindowModal);
//    v->setWindowFlags(Qt::WindowStaysOnTopHint);
    v->show();
}
/********显示键盘传回的数据**********/
void MainWindow::textview()
{
    QLineEdit *lineedit = this->findChild<QLineEdit *>(lineeditname);
    lineedit->setText(VirtualkeyboardAndDigitalkeyboardData);
}
/*****不断刷新界面显示键盘回传数据*****/
void MainWindow::Timer_1()
{
    timer = new QTimer(this);
    connect(timer,SIGNAL(timeout()),this,SLOT(textview()));
    timer->start(30);
}