能在qml組件需要的時(shí)候再創(chuàng)建，即延遲創(chuàng)建QML的時(shí)間，類似ios懶加載

main.qml

import QtQuick 2.1
import QtQuick.Window 2.0
import QtQuick.Controls 2.2

Window {
    visible: true
    width: 360
    height: 360
    Item
    {
        width: parent.width
        height: parent.height
        Loader
        {
            id:pageLoader
            source: "qrc:/page1.qml"
            focus: true
        }
        MouseArea
        {
            property bool isFirstClick:false
            anchors.fill: parent
            onClicked:
            {
                if( isFirstClick)
                {
                    pageLoader.source = "qrc:/page1.qml"
                }
                else{pageLoader.source = "qrc:/page2.qml"}
                isFirstClick = ! isFirstClick
            }
        }
    }
}

page1.qml

import QtQuick 2.0

Rectangle
{
    width: 360
    height: 100
    color: "red"
    focus: true
    Text {
        id: txt
        text: qsTr("Page1")
        anchors.fill: parent
    }
}

page2.qml

import QtQuick 2.0

Rectangle
{
    width: 360
    height: 100
    color: "blue"
    focus: true
    Text {
        id: txt
        text: qsTr("Page2")
        anchors.fill: parent
    }
}

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