Use QT designer interface class to create two interfaces, and switch from interface 1 to interface 2 by pressing the key

Ideas ： Button click function hide window 1 meanwhile emit Broadcast click signal （ Add by yourself ）,main Use connect, window 1 Send a click signal , Run window 2show Show function

Step one ：Add new——QT—— Designer interface class

Step two ： Window one

signals:
    void Show_EnterBtn();// The login button is clicked 

private slots:
    void on_EnterBtn_clicked();// Login button corresponding function ： Close the login screen , Broadcast login button click signal 

void Enter::on_EnterBtn_clicked()
{
    this->hide();// Hidden window 1
    emit Show_EnterBtn();// Broadcast button click signal 
}

Step three ： Window two

private slots:
    void  Show_FuncSelect();// Display window 2

Step four ：main function

 QObject::connect(&mEnter,SIGNAL(Show_EnterBtn()),&mFuncSelect,SLOT(Show_FuncSelect()));// Click button , close window 1, Display window 2