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在之前的例子中做一些修改，首先不显示ListViewModel数据，当点击鼠标后，显示数据。
几个要点：
用Q_INVOKABLE 创建C++的方法，这样可以在Qml中直接调用
清除model里面的数据必须用beginResetModel和endResetModel方法将清除代码包起来。
看一下完整的代码：
test.qml
import QtQuick 2.0import mylist 1.0ListView { width: 180; height: 200 model: PeopleListModel { id: model1 } delegate: Text { text: name + ": " + number } MouseArea { anchors.fill: parent onClicked: model1.reload(); } }plugin.cpp
#include <QtQml/QQmlExtensionPlugin>#include <QtQml/qqml.h>#include <qdebug.h>#include <qdatetime.h>#include <qbasictimer.h>#include <qcoreapplication.h>#include <QAbstractItemModel>#include <QStringList>#include <iostream>class People {public: People(QString const & name, QString const & number) : name_(name), number_(number) { } QString name() const { return name_; } QString number() const { return number_; }private: QString name_; QString number_;};class PeopleListModel : public QAbstractListModel { Q_OBJECTpublic: enum PeopleRoles { NameRole = Qt::UserRole + 1, NumberRole }; PeopleListModel(QObject * parent = 0) : QAbstractListModel(parent) { /* People p1("Dean", "186***"); addPeople(p1); People p2("Crystal", "186***"); addPeople(p2);*/ } void addPeople(People const & p) { beginInsertRows(QModelIndex(), rowCount(), rowCount()); values_ << p; endInsertRows(); } int rowCount(QModelIndex const & parent = QModelIndex()) const { return values_.count(); } QVariant data(QModelIndex const & index, int role = Qt::DisplayRole) const { std::cout << "data()" << std::endl; std::cout << "index row: " << index.row() << " index column: " << index.column() << std::endl; if (index.row() < 0 || index.row() >= values_.count()) { std::cout << "s1" << std::endl; return QVariant(); } People const & p = values_[index.row()]; std::cout << "role: " << role << std::endl; if (role == NameRole) { return p.name(); } else if (role == NumberRole) { return p.number(); } return QVariant(); } Q_INVOKABLE void reload() { std::cout << "--------------------" << std::endl; std::cout << "reload()" << std::endl; beginResetModel(); values_.clear(); endResetModel(); People p1("Dean", "176***"); addPeople(p1); People p2("Crystal", "176***"); addPeople(p2); std::cout << "values count: " << values_.count() << std::endl; }protected: QHash<int, QByteArray> roleNames() const { QHash<int, QByteArray> roles; roles[NameRole] = "name"; roles[NumberRole] = "number"; return roles; }private: QList<People> values_;};class QExampleQmlPlugin : public QQmlExtensionPlugin { Q_OBJECT Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtension.PeopleListModel") public: void registerTypes(char const * uri) { qmlRegisterType<PeopleListModel>(uri, 1, 0, "PeopleListModel"); }};#include "plugin.moc"运行效果，刚开始什么都没有，点击后出现数据。
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