如何从 C++ 创建 Qml 组件？

Question

我尝试使用QQmlComponent组件(view.engine(), QUrl::fromLocalFile("MyItem.qml"));然后是 QOObject *object = component.create();但它给我 Qml Component not ready。进一步尝试将 statusChanged 信号连接到槽函数，但它似乎没有加载新的 qml 组件。

QQuickView view;
view.setSource(QUrl(QStringLiteral("qrc:/main.qml")));
QQmlComponent component(view.engine(), QUrl::fromLocalFile("MyItem.qml"));
QObject *object = component.create();
object->setParent(view.rootObject());
view.show()

Answer 1

如果您从本地文件加载，则通过在构造函数中指定它来将 QQmlComponent 设置为同步加载：

QQmlComponent component(view.engine(),
                        QUrl::fromLocalFile("MyItem.qml"),
                        QQmlComponent::PreferSynchronous );

Answer 2

参见Interacting with QML Objects from C++。

Loading QML Objects from C++

A QML document can be loaded with QQmlComponent or QQuickView. QQmlComponent loads a QML document as a C++ object that can then be modified from C++ code. QQuickView also does this, but as QQuickView is a QWindow-derived class, the loaded object will also be rendered into a visual display; QQuickView is generally used to integrate a displayable QML object into an application's user interface.

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此外，更广泛的主题 Integrating QML and C++。

如何从 C++ 创建 Qml 组件？

How do I create a Qml component from C++?

c++

qt

qml