自定义组件中是可以直接使用main界面中根节点这个层级中声明的所有id

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MyRect01.qml

import QtQuick 2.0
import QtQuick.Controls 2.0
Rectangle{id:rec01width:450height: 200color: "green"Button{id:btn01text: "dian ji"onClicked: {yRec01.visible=falseyRec02.visible=true}}}

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 MyRec02.qml

import QtQuick 2.0
import QtQuick.Controls 2.0
Rectangle{id:rec01width: 300height: 150x:350color: "red"Button{id:btn01text: "dian ji"onClicked: {yRec01.visible=trueyRec02.visible=false}}
}

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main.qml

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.0
Window {visible: truewidth: 640height: 480title: qsTr("Hello World")MyRec01{id:yRec01visible: true}MyRec02{id:yRec02visible: false}}

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运行结果:

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FR:徐海涛（hunkxu）