QML的复选框是CheckBox，使用代码如下：

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.5
import QtQuick.Layouts 1.12

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    ColumnLayout {
          x:20
          y:20

          CheckBox {
              id:ch1
              checked: true
              text: qsTr("First")
          }
          CheckBox {
              id:ch2
              text: qsTr("Second")
          }
          CheckBox {
              id:ch3
              checked: true
              text: qsTr("Third")
          }

          Button{
              text: "获取CheckBox状态"
              onClicked: {
                  console.log(ch1.checked)
                  console.log(ch2.checked)
                  console.log(ch3.checked)
              }
          }
      }
}

运行界面