我在CMakeLists.txt中设置了这样一个项目：（这是一个以最大化大小打开的窗口。其中有一个按钮。当按钮被按下时，会出现一个弹出窗口）

cmake_minimum_required(VERSION 3.5)

project(ADB VERSION 0.1 LANGUAGES CXX)

set(CMAKE_INCLUDE_CURRENT_DIR ON)

set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(Qt6 COMPONENTS Quick Widgets REQUIRED)

set(SRC_DIR "${CMAKE_SOURCE_DIR}/src")
set(HEADERS_DIR "${CMAKE_SOURCE_DIR}/headers")

set(GLOB_RECURSE
    "${SRC_DIR}/main.cpp"
    "${HEADERS_DIR}/mainwindow.cpp"
    "${HEADERS_DIR}/mainwindow.hpp"
    "${HEADERS_DIR}/profilecreator.cpp"
    "${HEADERS_DIR}/profilecreator.hpp"
)

include_directories(${SRC_DIR})
include_directories(${HEADERS_DIR})

qt_add_executable(
    appADB
    WIN32
    "${GLOB_RECURSE}"
)

set_target_properties(
    appADB PROPERTIES
    MACOSX_BUNDLE_GUI_IDENTIFIER my.example.com
    MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
    MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
    MACOSX_BUNDLE TRUE
    WIN32_EXECUTABLE TRUE
)

target_link_libraries(
    appADB
    PRIVATE Qt${QT_VERSION_MAJOR}::Widgets
    PRIVATE Qt${QT_VERSION_MAJOR}::Gui
)

install(TARGETS appADB
    BUNDLE DESTINATION .
    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})

if(QT_VERSION_MAJOR EQUAL 6)
    qt_finalize_executable(ADB)
endif()

我有MainWindow类，只需按QPushButton“createP”启动弹出窗口：

#ifndef MAINWINDOW_HPP
#define MAINWINDOW_HPP

#include <QWidget>
#include <QDialog>

class MainWindow : public QWidget
{
    Q_OBJECT

public:
    MainWindow(QWidget* parent = nullptr);
    ~MainWindow();

private:
    QDialog* popup;

};
#endif  // MAINWINDOW_HPP

在主窗口中.cpp：

#include "mainwindow.hpp"
#include "profilecreator.hpp"

#include <QVBoxLayout>
#include <QGroupBox>
#include <QPushButton>
#include <QLineEdit>

MainWindow::MainWindow(QWidget* parent) : QWidget(parent)
{
    QPushButton* createP = new QPushButton("Create profile");
    createP->setStyleSheet("background-color: gray;");
    createP->setFixedSize(100, 25);
    createP->setToolTip("Create profile");

    QHBoxLayout* creationControls = new QHBoxLayout;
    controls->addWidget(createP);

    QGroupBox* controlsBox = new QGroupBox;
    controlsBox->setLayout(controls);

    // Add box the main layout
    QVBoxLayout* mainLayout = new QVBoxLayout;
    // add controls
    mainLayout->addWidget(controlsBox);

    setLayout(mainLayout);

    // Customize window
    setWindowTitle(tr("Checkbuttons table"));
    resize(1000, 1000);

    //==============Pop-up section=================

    // Create the popup window
    popup = new ProfileCreator();

    // Set the Qt::Popup window flag
    // NOTE: You can set flags only here, in the mainwindow where you instantiate popup class
    // otherwise: popup don't close correctly
    popup->setWindowFlags(windowFlags() | Qt::Popup);

    // Connect the createP button's clicked signal to the popup window's show slot
    QObject::connect(createP, &QPushButton::clicked, this, [&]() { popup->show(); });
        //<--- everything is good whith connecting 'createP' button and showing popup dialog

    // Connect create button from popup dialog to the addRow() method
    QObject::connect(popup, &ProfileCreator::createProfileClicked, this, [&]() { qDebug() << "you pressed"; });
       //<--- PROBLEM here. No instance of connect method for such actions
       // if I could simply log that I pressed a QDialog's button that would be enough for now
}

MainWindow::~MainWindow()
{
}

因此在ProfileCreator类中继承QDialog类。在头文件中：

#ifndef PROFILECREATOR_HPP
#define PROFILECREATOR_HPP

#include <QDialog>
#include <QPushButton>
#include <QLineEdit>

class ProfileCreator : public QDialog
{
    Q_OBJECT

signals:
    void createProfileClicked();

public:
    ProfileCreator();

    QPushButton* create;
};

#endif  // PROFILECREATOR_HPP

在实现文件中：

#include "profilecreator.hpp"
#include <QVBoxLayout>

ProfileCreator::ProfileCreator()
{
    // Set the size of the popup window
    this->resize(800, 1200);

    create = new QPushButton("Create");

    // Set the size policies of the widgets to Fixed
    create->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

    // Create a layout for the widgets
    QVBoxLayout* layout = new QVBoxLayout();

    // Add the widgets to the layout
    layout->addWidget(create);
    layout->addStretch();

    // Set the layout of the popup window
    this->setLayout(layout);

    // Emit signal of pushing the create new profile button when it pressed
    QObject::connect(create, &QPushButton::clicked, this, [&]() { emit createProfileClicked(); });
        //<--- So with previous line I want to send a signal that QDialog's button is clicked.
        //In the MainWindow constructor class I connect to such signal
}

在主.cpp中：

#include "mainwindow.hpp"

#include <QApplication>

int main(int argc, char* argv[])
{
    // Invoke application, just to appear everything else
    QApplication app(argc, argv);

    // Here we keep all widgets
    MainWindow window;

    // Use the following if you want to have the app open as maximized window:
    window.setWindowState(Qt::WindowMaximized);

    // Show window to application
    window.show();

    return app.exec();
}

所以我所做的和我期望通过几个步骤得到的是：
1.我创建了一个继承自QDialog的ProfileCreator类作为弹出窗口;
1.在ProfileCreator类中，我有QPushButton* create;
1.当我在ProfileCreator对象中按创建键时，将发出createProfileClicked信号。
1.在MainWindow类中，我初始化了一个指向ProfileCreator对象“popup”的指针。
1.同样在MainWindow类中，我创建了一个QPushButton* createP。
1.我用弹出show()方法连接createP &QPushButton::clicked信号。弹出应该显示。〈---直到这一点没有问题。
1.我还想从ProfileCreator连接一个QPushButton* create到lambda：[&](){qDebug() << "you pressed";}。记录消息-用于启动。
但是我好像不知道如何做步骤7的连接。
那么，谁能告诉我如何将一个类中弹出窗口的按钮与另一个类中的插槽连接起来呢？我知道，如果在MainWindow的构造函数中创建弹出窗口，连接起来就不会有问题。但是我想组织我的代码，并将MainWindow与ProfileCreator弹出窗口分开。