Converting UI Projects to Applications

Qt Quick UI projects are useful for creating user interfaces. To use them for application development in Qt Creator you have to add:

Project configuration file (.pro)
C++ code (.cpp)
Resource files (.qrc)
Code needed for deploying applications to devices

For more information about integrating QML and C++, see 概述 - QML 和 C++ 集成 .

You can use a Qt Creator wizard template to create a Qt Quick application that is built using the qmake build system and then copy the source files from the Qt UI Quick project to the application project.

可以使用 RESOURCES option in the project configuration file to automatically add all the QML files and related assets to a Qt resource file.

The wizard automatically adds the QML_IMPORT_PATH option to the project file for specifying the required QML import path . The path is only needed if more than one subdirectory contains QML files.

Then you can use the QQuickView class in the main C++ source file to show the main QML file when the application starts.

The Qt Quick Designer Components module is delivered with Qt Design Studio. If you use Studio Components or Effects in your project, you have to build the module and install it to your Qt to be able to build your project.

The Qt Quick Timeline module is delivered with Qt Design Studio and with Qt 5.14, and later. If you use a timeline in a Qt Design Studio project that you import to Qt Creator, and your Qt is older than 5.14, you must build the Qt Quick Timeline module and install it to your Qt to be able to build your project.

Converting Projects

To convert a project that has a .qmlproject file to one that has a .pro file:

选择 File > New File or Project > Application (Qt Quick) > Qt Quick Application - Empty > Choose .
在 Build system field, select qmake as the build system to use for building and running the project, and then select 下一 (or Continue on macOS).
Follow the instructions of the wizard to create the project.
In the file explorer, copy the source files from the Qt Quick UI project directory to a subdirectory in the application project directory. For the purpose of these instructions, the directory is called qml .
Open the application project file, and edit the value of the RESOURCES option to add the following line:
```
RESOURCES += \
$$files(qml/*)
									
```
Also edit the value of the QML_IMPORT_PATH option to specify the QML import path:
```
QML_IMPORT_PATH = qml/imports
									
```
Where qml/imports is the import path.
选择构建 > Run qmake to apply the RESOURCES option to the build configuration.

打开 main.cpp file and replace the QQmlApplicationEngine object with a QQuickView 对象：

    QQuickView view;
    view.engine()->addImportPath("qrc:/qml/imports");
    view.setSource(QUrl("qrc:/qml/ProgressBar.ui.qml"));
    if (!view.errors().isEmpty())
        return -1;
    view.show();

Where qrc:/qml/imports is the import path and qrc:/qml/ProgressBar.ui.qml is the path to and the name of the main QML file in the Qt Quick UI project.

选择构建 > 运行 to build and run your project.

For example, if you copy the source files of the ProgressBar example from your Qt Design Studio installation (located in the \share\qtcreator\examples\ProgressBar directory) to an empty Qt Quick application project and make the necessary changes, the main.cpp file should look as follows:

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQuickView>
int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QGuiApplication app(argc, argv);
    QQuickView view;
    view.engine()->addImportPath("qrc:/qml/imports");
    view.setSource(QUrl("qrc:/qml/ProgressBar.ui.qml"));
    if (!view.errors().isEmpty())
        return -1;
    view.show();
    app.exec();
}

Adding Custom Fonts

To use custom fonts from the Qt Quick UI project, call the QFontDatabase::addApplicationFont () function from the main.cpp 文件。

Adding Qt Quick Designer Components to Qt Installations

If you use Studio Components or Effects in your project, you have to check out and install the Qt Quick Designer Components module from Qt Code Review .

例如：

git clone "ssh://user@codereview.qt-project.org:29418/qt-labs/qtquickdesigner-components"

Then use qmake from your Qt installation to build the module and to add it to your Qt. Switch to the directory that contains the sources (usually, qtquickdesigner-components), and enter the following commands:

<path_to_qmake>\qmake -r
make
make install

On Windows, use the nmake and nmake install commands instead.

Adding Qt Quick Timeline Module to Qt Installations

注意： You only need to do this if your Qt version is older than 5.14.

Check out the Qt Quick Timeline module from Qt Code Review .

例如：

git clone ssh://user@codereview.qt-project.org:29418/qt/qtquicktimeline

Then build the module and add it to your Qt as described in the previous section.