C++ 如何在qml文件中使用在c++;文件
我在QML中使用信号时遇到问题。 我已经在cpp文件中创建了一个信号,我想在qml文件中使用它 文件AppUI.hpp:C++ 如何在qml文件中使用在c++;文件,c++,signals,qml,blackberry-10,C++,Signals,Qml,Blackberry 10,我在QML中使用信号时遇到问题。 我已经在cpp文件中创建了一个信号,我想在qml文件中使用它 文件AppUI.hpp: Class ApplicationUI: public QObject { Q_OBJECT Q_PROPERTY(bool loading READ loading NOTIFY loadingChanged) public: Q_SIGNALS: void loadingChanged(); private: bool _loading; bool
Class ApplicationUI: public QObject {
Q_OBJECT
Q_PROPERTY(bool loading READ loading NOTIFY loadingChanged)
public:
Q_SIGNALS:
void loadingChanged();
private:
bool _loading;
bool loading() const;
...
}
ApplicationUI::ApplicationUI(bb::cascades::Application *app) :
QObject(app),_loading(false) {
...
traitment
_loading=false;
emit lodingChanged();
}
bool AppnUI::loading() const{
return _loading;
}
MapView {
id: mapview
objectName: "mapViewObj"
visible: !_mapViewTest.loading
}
ActivityIndicator {
visible: _mapViewTest.loading
running: _mapViewTest.loading
}
在文件AppUI.cpp中:
Class ApplicationUI: public QObject {
Q_OBJECT
Q_PROPERTY(bool loading READ loading NOTIFY loadingChanged)
public:
Q_SIGNALS:
void loadingChanged();
private:
bool _loading;
bool loading() const;
...
}
ApplicationUI::ApplicationUI(bb::cascades::Application *app) :
QObject(app),_loading(false) {
...
traitment
_loading=false;
emit lodingChanged();
}
bool AppnUI::loading() const{
return _loading;
}
MapView {
id: mapview
objectName: "mapViewObj"
visible: !_mapViewTest.loading
}
ActivityIndicator {
visible: _mapViewTest.loading
running: _mapViewTest.loading
}
在QML文件中:
Class ApplicationUI: public QObject {
Q_OBJECT
Q_PROPERTY(bool loading READ loading NOTIFY loadingChanged)
public:
Q_SIGNALS:
void loadingChanged();
private:
bool _loading;
bool loading() const;
...
}
ApplicationUI::ApplicationUI(bb::cascades::Application *app) :
QObject(app),_loading(false) {
...
traitment
_loading=false;
emit lodingChanged();
}
bool AppnUI::loading() const{
return _loading;
}
MapView {
id: mapview
objectName: "mapViewObj"
visible: !_mapViewTest.loading
}
ActivityIndicator {
visible: _mapViewTest.loading
running: _mapViewTest.loading
}
但这里的问题是,我在控制台上得到了这个错误
错误:在Apple AptudioUI中不存在“加载”的通知信号“加载更改”。 < P>,C++中,为了使数据成员加载对QML可见,首先需要创建一个公共吸气剂,并将其设置为如下属性:
Q_PROPERTY(bool getloading READ getloading NOTIFY loadingChanged)
public bool getloading() const;
这是因为QML不能访问C++类中的私有成员。< /P>
也可以在QML中使用C++中的信号,如:
onCreationCompleted: { // or other function
_mapViewTest.lodingChanged.connect(whatyouwanttodo);
}
function whatyouwanttodo() {
// do something
}
请注意,您连接的信号和函数需要具有相同的参数列表到目前为止,我看到的唯一错误是“emit lodingChanged();”拼写错误。您正在得到的控制台错误是否在C++或QML中表示问题?谢谢您的响应。我纠正了拼写,效果很好:)