Xamarin.Forms — Xamarin Community Forums

Hello,

Zebra Technologies have SDKs for their RFID Scanners on platforms including native iOS, native Android and Xamarin.Android however not for Xamarin.iOS or Xamarin.Forms.

We are currently building a Xamarin.Forms app which critically requires the use of the RFID Scanner (RFD8500 model to be precise) on iOS. Our understanding is that this can be achieved by creating an iOS Binding Library for Zebra's existing Objective-C iOS SDK. I have personally attempted to bind this library through two methods, one being the classic iOS Binding method and two, creating a local C# Nuget Package for consumption. Due to lack of Objective-C experience, both attempts were unsuccessful.

What we would like to know is:

Is what we are trying to do even possible? (i.e would a binding library be enough to get the RFID scanners to work with a .forms app)
If so, what is the scale of effort?
As we lack the technical skills for it, would anybody be up for getting involved in this Open Source? (doing the actual work)

I think this would be a great project to do as over the last few months, I have found that a LOT of developers/companies have suffered from this same issue.

Thank you
Ridhwan

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I have a CollectionView which I want to use the minimum necessary width. The containing Grid has the following ColumnDefinitions:
<Grid.ColumnDefinitions><ColumnDefinition Width="Auto"/><ColumnDefinition Width="*"/></Grid.ColumnDefinitions>
And the code for the CollectionView is as follows:

<d:CollectionView.ItemsSource>

1
2
3
4
5
6
7
8
9
10
11
12

</d:CollectionView.ItemsSource>
<CollectionView.ItemTemplate></CollectionView.ItemTemplate>

And the following is a screenshot of what this shows:

I want the CollectionView (which is the black area) to use the minimum width on the left. What am I doing wrong? Thanks.

Is there any way to create this kind of UI (Like spinner) ?
Any idea would be appreciated.
Thanks.

Hello,
I am integrating firebase analytics in Xamarin.Forms project.Screen views are not getting tracked in correct order for iOS project.I am using below line of code in respective file's on appearing method-

LoginPage.xaml- Analytics.SetScreenNameAndClass("LoginScreen", null);
Dashboard.xaml- Analytics.SetScreenNameAndClass("DashboardScreen", null);
Employee.xaml- Analytics.SetScreenNameAndClass("ViewEmployeeScreen", null);

The above line of code is written in xamarin ios project and I am using dependency service to call it from PCL of xamarin forms.
For eg user flow is Login->Dashboard->ViewEmployee
In DebugView
Expected scenario shoud be : LoginScreen-> DashboardScreen(screen_view1) & DashboardScreen-> ViewEmployeeScreen(screen_view2)

Result I am getting: LoginScreen-> DashboardScreen(screen_view1), DashboardScreen->LoginScreen(screen_view2),LoginScreen->EmployeeScreen(screen_view3) . (Which is incorrect It should not go to login screen again)

Packages installed:
Xamarin.Firebase.iOS.Analytics(6.0.4)
Xamarin.Firebase.iOS.Core(6.1.0)
Xamarin.Firebase.iOS.Crashlytics(3.14.0)
Xamarin.Firebase.iOS.InstanceID(3.4.0)
Can anyone please let me know where I am going wrong?

Thanks in advance!

Xamarin.Forms: I have used a ListView and created a DataTemplate as custom ViewCell with Grid inside the same.
In my Grid I have created 3 Columns with picker inside first column and Entry as second and third column.
Whenever I click upon entry cell or TextChanged event is triggered, Picker in other column is also focused and picker item selection pop up is displayed.

I am trying to download a file from url and I am not using plugin . can any one please help me how to download a file from url.

Hello,

I have a document in docs from Google , when page it is opening it is downloading with a progress bar and showing in a Webview.

For so far so good.

But when i make the document longer then one page it is only showing the first page ? and i can't scroll to the next page nr 2

<ContentPage.Content>
    <local:PinchToZoomContainer>
        <local:PinchToZoomContainer.Content>

            <ScrollView>
                <StackLayout>
                    <ProgressBar Progress="0.2"  
             HorizontalOptions="FillAndExpand"  
             x:Name="progress"  
                     ProgressColor="Maroon"
             IsVisible="True"/>
                    <WebView x:Name="Webview"  
         HeightRequest="1000"  
         WidthRequest="1000"  
         Navigating="OnNavigating"  
         Navigated="OnNavigated"  
         VerticalOptions="FillAndExpand"/>
                </StackLayout>
            </ScrollView>
        </local:PinchToZoomContainer.Content>
    </local:PinchToZoomContainer>
</ContentPage.Content>

`public Nieuwsbrief()
{
InitializeComponent();
Webview.Source = "https://docs.google.com/document/d/1JtPBbacWjjE1RnqT7MlliexLFk618iNS5yUBBCkh1bs/edit?usp=sharing";
}
protected async override void OnAppearing()
{
base.OnAppearing();

        await progress.ProgressTo(0.9, 900, Easing.SpringIn);
    }

    protected void OnNavigating(object sender, WebNavigatingEventArgs e)
    {

        progress.IsVisible = true;

    }

    protected void OnNavigated(object sender, WebNavigatedEventArgs e)
    {

        progress.IsVisible = false;

    }


}`

Hi,

Currently I am working on QR code scanner, I want the single QR code which contains multiple data (number, text, url) and display the data in different fields,

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Hi,

How can assign NavigationPage.TitleView to a ContentView?

Thanks,
Jassim

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I have the a TabbedPage Application and want to change the textcolor at runtime.

<Label Text="Color change works for this label, as i set textcolor" TextColor="{DynamicResource MyTextColor}"/>
<Label Text="but i want to have it work for all labels and other elements without DynamicResource=MyTextColor"/>

public partial class TabPage : ContentPage
protected override void OnAppearing()
{
    // this works
    Resources["MyTextColor"] = DarkTheme ? Color.Red : Color.Blue;

    // this does not work at runtime, textcolor defined in styles <item name="android:textColor">#43d5e6</item> does not update at runtime
    SetTheme(DarkTheme ? Resource.Style.MainTheme_Dark: Resource.Style.MainTheme_Light);
}

item name="android:textColor> is differently defined in MainTheme_Dark and MainTheme_Light and gets at once applied to new Pages (for example Navigation.PushModalAsync(new NavigationPage(new NewPage())), but it gets not applied to existing TabPage. I have to close my app and only afterwards, it correctly applies the new "item name=android:textColor> from the selected MainTheme.

How can I force to change android:textColor at runtime in the OnAppearing()-event?

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Open Source Zebra RFID SDK for Xamarin Forms

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Using the Minimum Width for CollectionView

Create spinner picker UI in xamarin forms

Firebase Analytics-Manual Screen Views are not getting tracked in correct order for Xamarin.iOS

Picker when placed inside Listview is not working properly.

How to download a file from url in xamarin form

Only one page is showing in webview from Google docs

Scanning Multiple info in Single QR code and display the data in different fields