在QT 5中重新设置QT/QML映射

各位程序员好，

我想做的是用下面的QML重新中心我的地图。坐标是一对数字而不是像地图视图那样是地址

ApplicationWindow {
    visible: true
    width: 720
   height: 1280
   title: qsTr("")
    id: root
    Map {
       id: map
       anchors.centerIn: parent;
       anchors.fill: parent
       zoomLevel: 11
       objectName: "mainMap"
      center  {
        id: mapCenter
        latitude : 50.89
        longitude: 11.23
      }
      plugin: Plugin {
          name: "here"
          PluginParameter { name: "here.app_id"; value: "R9qav4Kw6gO5XKSxNiOO" }
          PluginParameter { name: "here.token"; value: "58UCNRCr1dZxhLL2Bmmz3Q" }
          PluginParameter { name: "here.proxy"; value: "system" }
      }
      function setPosition(pos) {
          map.toCoordinate(pos);
           map.update();
      }
}

c++端目前相对简单。到目前为止，这是我最好的尝试，直接改变纬度和经度似乎从来没有成功过。在早期版本中有效的方法是创建一个新的对象作为坐标，然后将其提供给地图。

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>
#include <QObject>
#include <QTime>
#include <QBasicTimer>
#include <QDebug>
#include <QEasingCurve>
#include <QGeoCoordinate>
#include <QtPositioning/private/qgeoprojection_p.h>
#include <QGeoServiceProvider>
#include <QDebug>
#include <QNetworkRequest>
int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);
    QUrl data("https://lstsim.de/js/dispatch/1.js");
    QNetworkRequest request(data);
    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    QObject *rootObject = engine.rootObjects().first();
    QObject* mainMapCenter = rootObject->findChild<QObject*>("mainMap");
   if(mainMapCenter != NULL){
       QVariant returnedValue;
       QPoint point(12,12);
       QMetaObject::invokeMethod(mainMapCenter, "setPosition",
       Q_RETURN_ARG(QVariant, returnedValue),
       Q_ARG(QVariant, point));
       qDebug() << "found map";
   }
    return app.exec();
}

就像前面提到的，在早期版本中这是有效的:

   function centermyposition(){ //sets my position, but only once (do not update automatically)
      var coord = Qt.createQmlObject('import QtMobility.location 1.1; Coordinate{latitude:' + positionSource.position.coordinate.latitude + ';longitude:' + positionSource.position.coordinate.longitude + ';}', positionSource, "coord");
      map.center = coord;
      myMapRoot.updateViewport()
}