一.动态加载

.h文件

1.添加#include

2.继承QQuickImageProvider类

3.声明虚函数requestImage(const QString &id, QSize *size, const QSize &requestedSize)

.cpp文件

利用函数requestImage(const QString &id, QSize *size, const QSize &requestedSize)完成图片，多个图片时，可以用 id 变量进行进一步判断。

.main

1.注册MyImageProvider

2.创建一个ImageProvider对象，并将其添加到QQuickEngine的图像提供者列表中

.qml

指定图片

二.代码演示

.h

#ifndef IMAGEPROVIDER_H
#define IMAGEPROVIDER_H
#include 
 
class ImageProvider : public QQuickImageProvider
{
public:
    ImageProvider();
 
    virtual QImage requestImage(const QString &id,  QSize *size , const QSize& requestedSize);
 
};
 
#endif // IMAGEPROVIDER_H

.cpp

#include "imageprovider.h"
 
ImageProvider::ImageProvider():QQuickImageProvider(QQuickImageProvider::Image)
{
 
}
 
QImage ImageProvider::requestImage(const QString &id, QSize *size, const QSize &requestedSize)
{
   if(id == "1"){
       return  QImage("D://1.jpg");
   }else if(id == "2"){
       return  QImage("D://2.jpg");
   }else{
        return QImage("D://3.jpg");
   }
}

.main

#include 
#include 
#include "imageprovider.h"
 
int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);
 
    QQmlApplicationEngine engine;
 
    ImageProvider *imageProvider = new ImageProvider();
    engine.addImageProvider("dynamic", imageProvider);
 
 
    const QUrl url(QStringLiteral("qrc:/main.qml"));
    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                     &app, [url](QObject *obj, const QUrl &objUrl) {
        if (!obj && url == objUrl)
            QCoreApplication::exit(-1);
    }, Qt::QueuedConnection);
    engine.load(url);
 
    return app.exec();
}

.qml

import QtQuick 2.0
import QtQuick.Window 2.0
import QtQuick.Controls 2.0
Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")
 
 
    Image {
        anchors.fill: parent
        source: "image://dynamic/3"
    }
 
}