QT界面布局、系统信号和槽、启动进程、EDIT回车快捷键、正常信号和槽、QMessageBox、UIC使用（界面重新生成）

版权声明：墨痕诉清风 https://blog.csdn.net/u012206617/article/details/88386919

界面布局

ctrl+H ：水平布局

ctrl+L：垂直布局

shift+alt+r：预览

设置固定大小

F4进入系统信号，鼠标拖拽（F3切换对话框）

启动进程

#include <QProcess>

QProcess *process = new QProcess;
QString strProcess = ui->cmdLineEdit->text();
process->start(strOricess.trimmend()); //去掉空格

EDIT回车快捷键

button按钮单击消息 

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    QObject::connect(ui->cmdLineEdit, SIGNAL(returnPressed()), this, SLOT(on_submitButton_clicked()));
}

正常信号和槽

加法运算

//h
class Widget : public QWidget
{
    Q_OBJECT
    
public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
    
private slots:
    void on_pushButton_clicked();
    void calSlot();

private:
    Ui::Widget *ui;
};

//CPP
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    QObject::connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(calSlot()));
}

void Widget::calSlot()
{
    int one = ui->lineEdit1->text().toInt();
    int two = ui->lineEdit2->text().toInt();

    int three = one + two;
    ui->lineEdit3->setText(QString::number(three));
}

QMessageBox

#include <QMessageBox>

QMessageBox::information(this, "Result", QString::number(three));
QMessageBox::information(NULL, "Result", QString::number(three));

UIC使用（界面重新生成）

进入工程，生成新的ui.h，复制粘贴到老工程替换掉