5,380 questions
Sending Xamarin forms iOS app to the background crashes.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(240, 70%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EKM%3C/text%3E%3C/svg%3E)
Kam M
31
Reputation points
Hi,
I get the following crash when I switch between applications / sending my application to the background.
On the form, I have Grid, Scroll view, TableView.
I appreciate your help and advice.
Thanks.
Kamal
at Xamarin.Forms.Platform.iOS.CheckBoxRendererBase`1[T].LayoutSubviews () [0x0000c] in <ff8f12b789024a7b92ed1e7ad7f7705e>:0
at (wrapper managed-to-native) UIKit.UIApplication.xamarin_UIApplicationMain(int,string[],intptr,intptr,intptr&)
at UIKit.UIApplication.UIApplicationMain (System.Int32 argc, System.String[] argv, System.IntPtr principalClassName, System.IntPtr delegateClassName) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/16.1.1.27/src/Xamarin.iOS/UIKit/UIApplication.cs:57
at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00013] in /Library/Frameworks/Xamarin.iOS.framework/Versions/16.1.1.27/src/Xamarin.iOS/UIKit/UIApplication.cs:82
at Tingle.iOS.Application.Main (System.String[] args) [0x00001] in /Users/kamalmostofi/Dev/Tingle/Tingle.iOS/Main.cs:17
Update
The device OS is the latest version 16.2, Xamarin Forms version is 5.0.0.2545, VS is 17.4.4 Build 12 for MAC, Xcode version is 14.2
Thank you.
<StackLayout Margin="20,10,20,10" Padding="20"
Orientation="Vertical"
VerticalOptions="FillAndExpand">
<TableView HeightRequest="1100"
Margin="{StaticResource marginThicknessAll10}"
HasUnevenRows="True"
Intent="Form" HorizontalOptions="FillAndExpand"
VerticalOptions="FillAndExpand">
<TableRoot>
<TableSection Title="{artina:Translate MembershipOption}">
<ViewCell>
<Picker
x:Name="AccountTypePicker"
BackgroundColor="{StaticResource BasePageColor}"
HorizontalOptions="FillAndExpand"
SelectedIndexChanged="AccountTypePicker_SelectedIndexChanged"
ItemDisplayBinding="{Binding Name}"
Style="{StaticResource PickerStyle}">
<Picker.WidthRequest>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>180</OnIdiom.Phone>
<OnIdiom.Tablet>280</OnIdiom.Tablet>
</OnIdiom>
</Picker.WidthRequest>
<Picker.HeightRequest>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>50</OnIdiom.Phone>
<OnIdiom.Tablet>70</OnIdiom.Tablet>
</OnIdiom>
</Picker.HeightRequest>
<Picker.FontSize>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>16</OnIdiom.Phone>
<OnIdiom.Tablet>24</OnIdiom.Tablet>
</OnIdiom>
</Picker.FontSize>
</Picker>
</ViewCell>
</TableSection>
<TableSection Title="Relationship Preferences">
<ViewCell>
<StackLayout
x:Name="filterOptions"
Margin="10,5,10,2"
Orientation="Vertical">
<StackLayout HorizontalOptions="Start" Orientation="Horizontal">
<CheckBox
x:Name="chkSerious"
CheckedChanged="chkSerious_CheckedChanged"
HorizontalOptions="Start" IsChecked="False"
VerticalOptions="CenterAndExpand"
Color="{StaticResource AccentColor}" >
<CheckBox.HeightRequest>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>30</OnIdiom.Phone>
<OnIdiom.Tablet>50</OnIdiom.Tablet>
</OnIdiom>
</CheckBox.HeightRequest>
<CheckBox.WidthRequest>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>50</OnIdiom.Phone>
<OnIdiom.Tablet>70</OnIdiom.Tablet>
</OnIdiom>
</CheckBox.WidthRequest>
</CheckBox>
<Label
HorizontalOptions="Start"
Text="Long Term"
VerticalOptions="CenterAndExpand" >
<Label.FontSize>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>16</OnIdiom.Phone>
<OnIdiom.Tablet>22</OnIdiom.Tablet>
</OnIdiom>
</Label.FontSize>
</Label>
</StackLayout>
<StackLayout HorizontalOptions="Start" Orientation="Horizontal">
<CheckBox
x:Name="chkCasual"
CheckedChanged="chkCasual_CheckedChanged"
HorizontalOptions="Start"
VerticalOptions="CenterAndExpand"
Color="{StaticResource AccentColor}" >
<CheckBox.HeightRequest>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>30</OnIdiom.Phone>
<OnIdiom.Tablet>50</OnIdiom.Tablet>
</OnIdiom>
</CheckBox.HeightRequest>
<CheckBox.WidthRequest>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>50</OnIdiom.Phone>
<OnIdiom.Tablet>70</OnIdiom.Tablet>
</OnIdiom>
</CheckBox.WidthRequest>
</CheckBox>
<Label
HorizontalOptions="Start"
Text="{artina:Translate Casual}"
VerticalOptions="CenterAndExpand" >
<Label.FontSize>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>16</OnIdiom.Phone>
<OnIdiom.Tablet>22</OnIdiom.Tablet>
</OnIdiom>
</Label.FontSize>
</Label>
</StackLayout>
<StackLayout HorizontalOptions="Start" Orientation="Horizontal">
<CheckBox
x:Name="chkCompanion"
CheckedChanged="chkCompanion_CheckedChanged"
HorizontalOptions="Start"
VerticalOptions="CenterAndExpand"
Color="{StaticResource AccentColor}" >
<CheckBox.HeightRequest>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>30</OnIdiom.Phone>
<OnIdiom.Tablet>50</OnIdiom.Tablet>
</OnIdiom>
</CheckBox.HeightRequest>
<CheckBox.WidthRequest>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>50</OnIdiom.Phone>
<OnIdiom.Tablet>70</OnIdiom.Tablet>
</OnIdiom>
</CheckBox.WidthRequest>
</CheckBox>
<Label
HorizontalOptions="Start"
Text="{artina:Translate Companion}"
VerticalOptions="CenterAndExpand" >
<Label.FontSize>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>16</OnIdiom.Phone>
<OnIdiom.Tablet>22</OnIdiom.Tablet>
</OnIdiom>
</Label.FontSize>
</Label>
</StackLayout>
</StackLayout>
</ViewCell>
</TableSection>
<TableSection Title="Select one or more options">
<ViewCell>
<ListView
x:Name="lstRelationType" MinimumHeightRequest="180" HeightRequest="250"
VerticalOptions="FillAndExpand" BackgroundColor="{StaticResource BasePageColor}">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout Margin="10,0,0,5" HorizontalOptions="FillAndExpand"
Orientation="Horizontal" >
<CheckBox
x:Name="chkRelationType"
HorizontalOptions="Start"
IsChecked="{Binding isChecked}"
VerticalOptions="CenterAndExpand"
Color="{StaticResource AccentColor}" >
<CheckBox.HeightRequest>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>50</OnIdiom.Phone>
<OnIdiom.Tablet>70</OnIdiom.Tablet>
</OnIdiom>
</CheckBox.HeightRequest>
<CheckBox.WidthRequest>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>50</OnIdiom.Phone>
<OnIdiom.Tablet>70</OnIdiom.Tablet>
</OnIdiom>
</CheckBox.WidthRequest>
</CheckBox>
<Label
HorizontalOptions="Start"
Text="{Binding Name}"
VerticalOptions="CenterAndExpand" >
<Label.FontSize>
<OnIdiom x:TypeArguments="x:Double">
<OnIdiom.Phone>16</OnIdiom.Phone>
<OnIdiom.Tablet>22</OnIdiom.Tablet>
</OnIdiom>
</Label.FontSize>
</Label>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</ViewCell>
</TableSection>
</TableRoot>
</TableView>
</StackLayout>
Developer technologies | .NET | Xamarin
{count} votes
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(22.400000000000002, 3%, 12%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EWZ%3C/text%3E%3C/svg%3E)
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff2023-02-13T08:40:57.4266667+00:00 It crashed at
CheckBoxRendererbut your page didn't have a Checkbox (you said "On the form, I have Grid, Scroll view, TableView."), right? Or there is the checkbox on the TableView? Would you mind sharing more code snippets so that I can reproduce the issue? What's the OS version of your device? What's the Xamarin.Forms, VS, Xcode version? -
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff
2023-02-14T09:32:24.0533333+00:00 I tested the code snippets with the simulator and physical device, but I have to say I still cannot reproduce your issue. (Since it's not clear about the bindingcontext and itemsource for the tableview and listview, I add a simple
ObservableCollectionfor testing).
I noticed that there are several Checkbox controls in the TableView and there is a listview on the cell, some Checkbox controls are in the listview. Can you mini your code to determine which checkbox causing this problem? -
Kam M 31 Reputation points
2023-02-14T09:34:27.1866667+00:00 Hi,
Sure. I have Checkbox controls in the TableView.
The device OS is the latest version 16.2, Xamarin Forms version is 5.0.0.2545, VS is 17.4.4 Build 12 for MAC, Xcode version is 14.2
Thank you.
<StackLayout Margin="20,10,20,10" Padding="20" Orientation="Vertical" VerticalOptions="FillAndExpand"> <TableView HeightRequest="1100" Margin="{StaticResource marginThicknessAll10}" HasUnevenRows="True" Intent="Form" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"> <TableRoot> <TableSection Title="{artina:Translate MembershipOption}"> <ViewCell> <Picker x:Name="AccountTypePicker" BackgroundColor="{StaticResource BasePageColor}" HorizontalOptions="FillAndExpand" SelectedIndexChanged="AccountTypePicker_SelectedIndexChanged" ItemDisplayBinding="{Binding Name}" Style="{StaticResource PickerStyle}"> <Picker.WidthRequest> <OnIdiom x:TypeArguments="x:Double"> <OnIdiom.Phone>180</OnIdiom.Phone> <OnIdiom.Tablet>280</OnIdiom.Tablet> </OnIdiom> </Picker.WidthRequest> <Picker.HeightRequest> <OnIdiom x:TypeArguments="x:Double"> <OnIdiom.Phone>50</OnIdiom.Phone> <OnIdiom.Tablet>70</OnIdiom.Tablet> </OnIdiom> </Picker.HeightRequest> <Picker.FontSize> <OnIdiom x:TypeArguments="x:Double"> <OnIdiom.Phone>16</OnIdiom.Phone> <OnIdiom.Tablet>24</OnIdiom.Tablet> </OnIdiom> </Picker.FontSize> </Picker> </ViewCell> </TableSection> <TableSection Title="Relationship Preferences"> <ViewCell> <StackLayout x:Name="filterOptions" Margin="10,5,10,2" Orientation="Vertical"> <StackLayout HorizontalOptions="Start" Orientation="Horizontal"> <CheckBox x:Name="chkSerious" CheckedChanged="chkSerious_CheckedChanged" HorizontalOptions="Start" IsChecked="False" VerticalOptions="CenterAndExpand" Color="{StaticResource AccentColor}" > <CheckBox.HeightRequest> <OnIdiom x:TypeArguments="x:Double"> <OnIdiom.Phone>30</OnIdiom.Phone> <OnIdiom.Tablet>50</OnIdiom.Tablet> </OnIdiom> </CheckBox.HeightRequest> <CheckBox.WidthRequest> <OnIdiom x:TypeArguments="x:Double"> <OnIdiom.Phone>50</OnIdiom.Phone> <OnIdiom.Tablet>70</OnIdiom.Tablet> </OnIdiom> </CheckBox.WidthRequest> </CheckBox> <Label HorizontalOptions="Start" Text="Long Term" VerticalOptions="CenterAndExpand" > <Label.FontSize> <OnIdiom x:TypeArguments="x:Double"> <OnIdiom.Phone>16</OnIdiom.Phone> <OnIdiom.Tablet>22</OnIdiom.Tablet> </OnIdiom> </Label.FontSize> </Label> </StackLayout> <StackLayout HorizontalOptions="Start" Orientation="Horizontal"> <CheckBox x:Name="chkCasual" CheckedChanged="chkCasual_CheckedChanged" HorizontalOptions="Start" VerticalOptions="CenterAndExpand" Color="{StaticResource AccentColor}" > <CheckBox.HeightRequest> <OnIdiom x:TypeArguments="x:Double"> <OnIdiom.Phone>30</OnIdiom.Phone> <OnIdiom.Tablet>50</OnIdiom.Tablet> </OnIdiom> </CheckBox.HeightRequest> <CheckBox.WidthRequest> <OnIdiom x:TypeArguments="x:Double"> <OnIdiom.Phone>50</OnIdiom.Phone> <OnIdiom.Tablet>70</OnIdiom.Tablet> </OnIdiom> </CheckBox.WidthRequest> </CheckBox> <Label HorizontalOptions="Start" Text="{artina:Translate Casual}" VerticalOptions="CenterAndExpand" > <Label.FontSize> <OnIdiom x:TypeArguments="x:Double"> <OnIdiom.Phone>16</OnIdiom.Phone> <OnIdiom.Tablet>22</OnIdiom.Tablet> </OnIdiom> </Label.FontSize> </Label> </StackLayout> <StackLayout HorizontalOptions="Start" Orientation="Horizontal"> <CheckBox x:Name="chkCompanion" CheckedChanged="chkCompanion_CheckedChanged" HorizontalOptions="Start" VerticalOptions="CenterAndExpand" Color="{StaticResource AccentColor}" > <CheckBox.HeightRequest> <OnIdiom x:TypeArguments="x:Double"> <OnIdiom.Phone>30</OnIdiom.Phone> <OnIdiom.Tablet>50</OnIdiom.Tablet> </OnIdiom> </CheckBox.HeightRequest> <CheckBox.WidthRequest> <OnIdiom x:TypeArguments="x:Double"> <OnIdiom.Phone>50</OnIdiom.Phone> <OnIdiom.Tablet>70</OnIdiom.Tablet> </OnIdiom> </CheckBox.WidthRequest> </CheckBox> <Label HorizontalOptions="Start" Text="{artina:Translate Companion}" VerticalOptions="CenterAndExpand" > <Label.FontSize> <OnIdiom x:TypeArguments="x:Double"> <OnIdiom.Phone>16</OnIdiom.Phone> <OnIdiom.Tablet>22</OnIdiom.Tablet> </OnIdiom> </Label.FontSize> </Label> </StackLayout> </StackLayout> </ViewCell> </TableSection> <TableSection Title="Select one or more options"> <ViewCell> <ListView x:Name="lstRelationType" MinimumHeightRequest="180" HeightRequest="250" VerticalOptions="FillAndExpand" BackgroundColor="{StaticResource BasePageColor}"> <ListView.ItemTemplate> <DataTemplate> <ViewCell> <StackLayout Margin="10,0,0,5" HorizontalOptions="FillAndExpand" Orientation="Horizontal" > <CheckBox x:Name="chkRelationType" HorizontalOptions="Start" IsChecked="{Binding isChecked}" VerticalOptions="CenterAndExpand" Color="{StaticResource AccentColor}" > <CheckBox.HeightRequest> <OnIdiom x:TypeArguments="x:Double"> <OnIdiom.Phone>50</OnIdiom.Phone> <OnIdiom.Tablet>70</OnIdiom.Tablet> </OnIdiom> </CheckBox.HeightRequest> <CheckBox.WidthRequest> <OnIdiom x:TypeArguments="x:Double"> <OnIdiom.Phone>50</OnIdiom.Phone> <OnIdiom.Tablet>70</OnIdiom.Tablet> </OnIdiom> </CheckBox.WidthRequest> </CheckBox> <Label HorizontalOptions="Start" Text="{Binding Name}" VerticalOptions="CenterAndExpand" > <Label.FontSize> <OnIdiom x:TypeArguments="x:Double"> <OnIdiom.Phone>16</OnIdiom.Phone> <OnIdiom.Tablet>22</OnIdiom.Tablet> </OnIdiom> </Label.FontSize> </Label> </StackLayout> </ViewCell> </DataTemplate> </ListView.ItemTemplate> </ListView> </ViewCell> </TableSection> </TableRoot> </TableView> </StackLayout> -
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff
2023-02-14T09:35:32.5166667+00:00 In addition, I have added these code snippets into the question, you can check it.
-
Kam M 31 Reputation points
2023-02-17T05:44:07.9533333+00:00 Hi,
That is correct, there are 3 checkboxes and a listview that contains checkboxes. I don't have any checkbox renderer in my project.
I pinned down the issue to a null object and could not understand the link between that object and the checkboxes.
Thank you for your help, have a great day.
-
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff
2023-02-17T09:47:45.7566667+00:00 It might be caused by the listview that contains checkboxes, but I still cannot reproduce your issueit is recommended to open a support ticket for this. Please contact our paid phone support at MS Support. You will get 1:1 support on that.
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