Layering Bug in PageControl with MapView

Dear Fuse-Team :slight_smile:

Sadly (or gladly ^^) I found a bug with a nested navigation via PageControl and a MapView on a subpage :frowning:

To demonstrate the bug, I created a little test app :slight_smile:

I only colored one site red (the first one), to which I will navigate again at the end resulting in the bug, displaying a Map from a different subpage ontop of the red oneโ€ฆ

To follow the navigation process, just keep clicking on the text-buttons you see :wink:

Code unoproj:

  "Android": {
   "Geo": {
        "ApiKey": "---YOUR_KEY_HERE---"
  "Packages": [
  "Includes": [

Code ux:

    <PageControl ux:Name="MainNavigation" Active="Page1" Interaction="None">
        <NavigationMotion GotoType="SmoothSnap" GotoDuration="0.08" />

        <Page ux:Name="Page1" Background="#F00">
            <Text Value="Page 1" Alignment="Center">
                    <Set MainNavigation.Active="Page2" />

        <Page ux:Name="Page2" >
            <PageControl ux:Name="SubNavigation" Active="subpage2" Interaction="None">
                <NavigationMotion GotoType="SmoothSnap" GotoDuration="0.08" />

                <Page ux:Name="subpage1">
                    <Text Value="Sub-Page 1" Alignment="Center">
                            <Set SubNavigation.Active="subpage1" />

                <Page ux:Name="subpage2" >
                        <Fuse.iOS.StatusBarConfig Style="Dark" />
                        <StatusBarBackground Dock="Top"/>

                            <MapView ux:Name="panel2" Margin="0,0,0,0" Height="100%" Latitude="50.9303675" Longitude="6.950763000000052" Zoom="12" ShowMyLocationButton="true" > 

                        <Panel Dock="Bottom" Height="47">
                            <Text Value="Sub Page 2" Alignment="Center">
                                    <Set SubNavigation.Active="subpage3" />

                <Page ux:Name="subpage3">
                    <Text Value="Sub Page 3" Alignment="Center">
                            <Set MainNavigation.Active="Page3" />


        <Page ux:Name="Page3">
            <Text Value="Page 3" Alignment="Center">
                    <Set MainNavigation.Active="Page1" />



  • Fuse_ver: 0.23.0 build 7041
  • OS: OSX 10.11.6

Xcode-Output after clicking the first Text-button (app keeps running - No further logs on any other buttonpresses):

2016-08-11 04:05:53.462 MapViewBug[1706:848618] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. 
    Try this: 
        (1) look at each constraint and try to figure out which you don't expect; 
        (2) find the code that added the unwanted constraint or constraints and fix it. 
    (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
    "<NSAutoresizingMaskLayoutConstraint:0x4627c2b0 h=-&- v=-&- MKMapView:0x462c2ec0.height == UIView:0x462c2db0.height>",
    "<NSLayoutConstraint:0x462c8210 UILayoutGuide:0x462c8100'Edge Insets'.top == + 20>",
    "<NSLayoutConstraint:0x462c83c0 UILayoutGuide:0x462c8100'Edge Insets'.bottom == MKMapView:0x462c2ec0.bottom>",
    "<NSLayoutConstraint:0x41eebf50 'UIView-Encapsulated-Layout-Height' V:[UIView:0x462c2db0(0)]>"

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x462c83c0 UILayoutGuide:0x462c8100'Edge Insets'.bottom == MKMapView:0x462c2ec0.bottom>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.

I hope that I put everything you need together, if not please tell me :slight_smile:

Sorry for the long post :stuck_out_tongue:



EDIT: Here is the visual proof :wink:

I have this exact same result in XCode when using MapView within a PageControl.

Hello mrcl3an2008 !

Thank you for telling me, im not the only one ^^

Do you think I missed anything in my report? Since Im still a noob, I wanna make sure I did everything properly.



Hey guys, cool to see people coming up with smaller test cases to illustrate bugs.

Adding a link for reference, since this one has been covered in another forum thread, here:

All that said, Fuse team has been specifically notified about this issue in both of the forum threads, and I assume theyโ€™ll notify us here when they get to it, priorities permitting.

Just to be sure, Iโ€™ve linked our internal issue for the other thread to this one as well.

OMG Jake Taylor himself answered to my noob-post :slight_smile:

Im feeling honored!! Thank you very much <3