How to use UI of one window to another window?

[Aahi]

let's say I have two windows main_window and second_window, In main window I have "ui->checkBox->setChecked(true);" in main_window constructor and in second window I have a push_button and I want to uncheck the checkBox of main_window using the push_button of second_window so Basically in second_window I want to do is "main_window::ui->checkBox->setChecked(false);"

So how can I do that also I don't want to change the ui from private to public?

[goloviznin.k]

@Aahi You don't have to use this old connection style. Remove SIGNAL and SLOT words.

auto window2 = new MainWindow();

connect(ui->pushButton, &QPushButton::pressed, window2, &MainWindow::some_slot_that_you_have_in_MainWindow_class);

some_slot_that_you_have_in_MainWindow_class()
{
    ui->checkBox->setChecked(false);
}

Something like that

[goloviznin.k]

@Aahi Hi,
I think you need something like:

connect(window2_button_reference, &QPushButton::pressed, window1_reference, &Window1ClassName::uncheck_slot_name);

[Aahi]

@goloviznin-k It didn;t work this is what I write

connect(ui->pushButton, SIGNAL(&QPushButton::pressed),new MainWindow(), SLOT( &MainWindow::ui->checkBox->setChecked(false)));

window1 = MainWindow
window2 = enter_mail (don't ask why)

It didn't uncheck the the checkBox from window1

[goloviznin.k]

@Aahi You don't have to use this old connection style. Remove SIGNAL and SLOT words.

auto window2 = new MainWindow();

connect(ui->pushButton, &QPushButton::pressed, window2, &MainWindow::some_slot_that_you_have_in_MainWindow_class);

some_slot_that_you_have_in_MainWindow_class()
{
    ui->checkBox->setChecked(false);
}

Something like that