1.在mainwindow.h 添加声明

class QLineEdit;
class QDialog;void textFind();    //查找文本void textNext();    //查找下一个

2.在cpp里面进行添加、布局、定义

添加查找和布局窗口

 //查找QAction *action_textfind = new QAction("查找",this);connect(action_textfind,&QAction::triggered,this,&MainWindow::textFind);ui->mainToolBar->addAction(action_textfind);m_findDialg = new QDialog(this); //查找对话框m_lineEdit = new QLineEdit(m_findDialg); //查找输入框QPushButton *btn = new QPushButton(m_findDialg);btn->setText("查找下一个");connect(btn,&QPushButton::clicked,this,&MainWindow::textNext);//进行垂直布局QVBoxLayout *layout = new QVBoxLayout;layout->addWidget(m_lineEdit);layout->addWidget(btn);m_findDialg->setLayout(layout);

对第一步的声明进行定义

vo