程序運行截圖如下：

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邏輯：

1.使用Q_PROPERTY宏讓元對象能對這個數據成員進行訪問

2.在QML系統中注冊C++

3.qml進行調用，實現qml與C++的交互

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源碼如下：

testproperty.h

#ifndef TESTPROPERTY_H #define TESTPROPERTY_H#include <QObject>class TestProperty : public QObject {Q_OBJECT public:explicit TestProperty(QObject *parent = 0);Q_PROPERTY(QString title READ title WRITE setTitle NOTIFY titleChanged)QString title();void setTitle(QString title);signals:void titleChanged();public slots:private:QString m_title; };#endif // TESTPROPERTY_H

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testproperty.cpp

#include "testproperty.h" #include <QDebug>TestProperty::TestProperty(QObject *parent) : QObject(parent) {}QString TestProperty::title() {return m_title; }void TestProperty::setTitle(QString title) {m_title=title;qDebug()<<"TestProperty::setTitle(QString title) called! "<<title;emit titleChanged(); }

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main.cpp

#include <QGuiApplication> #include <QQmlApplicationEngine> #include "testproperty.h"int main(int argc, char *argv[]) {QGuiApplication app(argc, argv);qmlRegisterType<TestProperty>("TestProperty",1,0,"TestProperty");QQmlApplicationEngine engine;engine.load(QUrl(QStringLiteral("qrc:/main.qml")));return app.exec(); }

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main.qml

import QtQuick 2.6 import QtQuick.Window 2.2 import TestProperty 1.0 import QtQuick.Controls 1.2Window {visible: truewidth: 640height: 480title: qsTr("Q_PROPERTY 實例")TextEdit{id:textEditwidth:240;font.family: "Helvetica"font.pointSize: 20color:"blue"}Rectangle{width: 100height:200color:"green"anchors.centerIn: parentButton{anchors.fill: parentfocus: trueonClicked:{testProperty.title=textEdit.text}}}TestProperty{id:testProperty} }

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