qt quick emulation layer crashed line 1

[HeMinzhang]

Qt Creator:4.6.1

qml code:

import QtQuick 2.2
import QtQuick.Window 2.2
import QtQuick.Controls 2.2

Window {
    visible: true
    width: 800
    height: 600
    title: qsTr("宙斯万岁！")

    SwipeView {
        id: swipeView
        width: 700
        height: 600
        currentIndex: 0
        Item {
            id: scannerItem
            visible: swipeView.currentIndex == 0
            Button {
                id: button2
                x: 338
                y: 203
                text: qsTr("Start")
            }

            Button {
                id: button3
                x: 458
                y: 203
                text: qsTr("Next")
            }

            ComboBox {
                id: comboBox
                x: 395
                y: 110
                editable: true
                model: ListModel {
                    id: model
                    ListElement {
                        text: "Byte"
                    }
                    ListElement {
                        text: "2 Bytes"
                    }
                    ListElement {
                        text: "4 Bytes"
                    }
                    ListElement {
                        text: "8 Bytes"
                    }
                }
            }
        }
        Item {
            id: mainItem
            visible: swipeView.currentIndex == 1
            Label {
                id: label
                x: 81
                y: 54
                width: 170
                height: 50
                color: "#da0aa0"
                text: qsTr("China")
                font.pointSize: 20
            }
        }
    }
    Button {
        id: button
        x: 0
        y: 0
        text: qsTr("Index")
        onClicked: {
            swipeView.setCurrentIndex(1)
        }
    }

    Button {
        id: button1
        x: 0
        y: 41
        text: qsTr("Button1")
        onClicked: {
            swipeView.setCurrentIndex(0)
        }
    }
}

[HeMinzhang]

@sierdzio
Thanks a million.
But not the cause of this error，
Because SwipeView child control "Item" didn't specify width and height properties or otherwise by such as anchors.fill: parent.
Otherwise ad I found child control Item volume(width and height) must not greater than parent control volume.
Hope I can help others.

[sierdzio]

Your swipe view has only a single page, so setting current index to 1 will crash it.

[HeMinzhang]

@sierdzio
Thanks a million.
But not the cause of this error，
Because SwipeView child control "Item" didn't specify width and height properties or otherwise by such as anchors.fill: parent.
Otherwise ad I found child control Item volume(width and height) must not greater than parent control volume.
Hope I can help others.