I can't move my slider. Heelp

[myta212]

Hi,
The problem is you set the "initial mainWindow design" at top of your slider design. Please move location of

ui->setupUi(this);

ui->setupUi(this);

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at top of your constructor mainWindow. So, your constructor is like this :

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    this->setFixedSize(500,800);
    timer = new QTimer(this);
    slider= new QSlider(Qt::Horizontal, this);
    slider->setValue(3);
    slider->setMaximum (15);
    slider->setMinimum (1);
    slider->setGeometry(QRect((width()/2)-100, (height()*8/9), 200, 50));
    tekst = new QLabel(this);
    tekst->setStyleSheet("font: 38pt;");
    tekst->setGeometry(QRect((width()/2)-10, (height()*7/9), 80, 80));
    connect(timer, SIGNAL(timeout()), this, SLOT(updated()));
    connect(slider, SIGNAL(valueChanged(int)), this, SLOT(predkosc(int)));
    predkosc(3);
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    this->setFixedSize(500,800);
    timer = new QTimer(this);
    slider= new QSlider(Qt::Horizontal, this);
    slider->setValue(3);
    slider->setMaximum (15);
    slider->setMinimum (1);
    slider->setGeometry(QRect((width()/2)-100, (height()*8/9), 200, 50));
    tekst = new QLabel(this);
    tekst->setStyleSheet("font: 38pt;");
    tekst->setGeometry(QRect((width()/2)-10, (height()*7/9), 80, 80));
    connect(timer, SIGNAL(timeout()), this, SLOT(updated()));
    connect(slider, SIGNAL(valueChanged(int)), this, SLOT(predkosc(int)));
    predkosc(3);
}

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Best regards,

Toto