Qt工作笔记-QML与C++交互

程序运行截图如下：

逻辑：

1.使用Q_PROPERTY宏让元对象能对这个数据成员进行访问

2.在QML系统中注册C++

3.qml进行调用，实现qml与C++的交互

源码如下：

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

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();
}

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();
}

main.qml

import QtQuick 2.6
import QtQuick.Window 2.2
import TestProperty 1.0
import QtQuick.Controls 1.2

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Q_PROPERTY 实例")

    TextEdit{
        id:textEdit
        width:240;
        font.family: "Helvetica"
        font.pointSize: 20
        color:"blue"
    }

    Rectangle{
        width: 100
        height:200
        color:"green"
        anchors.centerIn: parent
        Button{
            anchors.fill: parent
            focus: true
            onClicked:{
                testProperty.title=textEdit.text
            }
        }
    }


    TestProperty{
        id:testProperty
    }
}