Create Spin Progress bar in Qt

Question

Create Spin Progress bar in Qt, I want to show progress bar like the one which appears while loading. Please Find Image

Answer 1

Have a look at the Twitter Mobile example application. In the file demos/declarative/twitter/qml/twitter/TwitterCore/Loading.qml there is an implementation in QML of the exact thing you want to achieve:

import QtQuick 1.0

Image {
    id: loading
    source: "images/loading.png"
    NumberAnimation on rotation {
         from: 0
         to: 360
         running: loading.visible == true
         loops: Animation.Infinite
         duration: 900
     }
}

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Update 1 (reflecting the newly posted code):

Employing QML just for a spinning load indicator in your otherwise Qt Widgets based application seems overkill to me. I would use a QMovie in conjunction with a QLabel to display an animated GIF image containing the spinner:

QMovie* spinnerMovie = new QMovie(":/spinner.gif");
QLabel *spinnerLabel = new QLabel(this);
spinnerLabel->setMovie(spinnerMovie);
spinnerMovie->start();

You should also have a look at the documentation for the Qt Resource System to learn how to bundle images with your application and how to load them.