Mapview crash on iOS

JamesPettitt — Fri, 16 Mar 2018 22:43:22 GMT

I am hoping to see if anyone knows anything about this issue and any potential workarounds.

The issue is that if a mapview with a map inside of it is created and later destroyed it crashes with the below message:

ASSERT failure in QCoreApplication::sendEvent: "Cannot send events to objects owned by a different thread. Current thread 0x0x174329f60. Receiver '' (of type 'QRTImpl::LocationDisplayImpl') was created in thread 0x0x17001d940", file kernel/qcoreapplication
.cpp, line 563

This does not happen on Mac or Android. The usecase I have for this is creating a map in a component loaded up in a stackView. When I navigate away from that component the stackview kills the mapview which causes the crash. I created an Empty ArcGIS qml app for testing this issue in a more simple way by showing the map in a loader with a button that "unloads" it. See the bottom of the post for a simple example.

import QtQuick 2.6

import QtQuick.Controls 1.4

import Esri.ArcGISRuntime 100.2

ApplicationWindow {

    id: appWindow

    width: 800

    height: 600

    title: "IosMapTest"

    Rectangle {

        id: backgroundRect

        anchors.fill: parent

        color: "red"

    Loader {

        id: mapLoader

        anchors.fill: parent

        // add a mapView component

        sourceComponent: MapView {

            anchors.fill: parent

            // set focus to enable keyboard navigation

            focus: true

            // add a map to the mapview

            Map {

                // add the BasemapTopographic basemap to the map

                BasemapTopographic {}

    Button {

        anchors.bottom: parent.bottom

        anchors.right: parent.right

        text: "click here for crash"

        onClicked: mapLoader.sourceComponent = undefined

Re: Mapview crash on iOS

LucasDanzinger — Tue, 27 Mar 2018 16:10:58 GMT

I don't have any suggested workarounds at the moment, but I can reproduce the crash. Can you please log a support case with Esri support so we can get a official bug logged? Thanks

-Luke

Re: Mapview crash on iOS

LucasDanzinger — Wed, 28 Mar 2018 17:27:48 GMT

As a workaround, can you hold onto the MapView in a var somewhere that you know it won't get deleted?

Re: Mapview crash on iOS

JamesPettitt — Mon, 09 Apr 2018 14:04:05 GMT

Thats what I ended up doing to work around this. I create the map in my main.qml file then reparent and anchors.fill it to my components as they need to display a map.

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Mapview crash on iOS

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