I want to see two columns in one listview . (something like grid but grid is not scrollable) . I need this because I want list view item scrollable.
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two columns in one list view
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Xamarin.Essentials Web Authenticator
Why i get exception "You must subclass the WebAuthenticatorCallbackActivity and create an IntentFilter for it which matches your callbackUrl." when set urn:ietf:wg:oauth:2.0:oob in DataScheme?
My redirectUrl = "urn:ietf:wg:oauth:2.0:oob://" and i try set just "urn:ietf:wg:oauth:2.0:oob" and again get this exception.
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Disable Navigation Bar/Enable InteractivePopGestureRecognizer causes navigation/popasync issue
Here is exactly what is happening to me...
https://github.com/wix/react-native-navigation/issues/428#issuecomment-260427414
Basically, I have a MasterDetail page and the Detail page is a listview. When tapping on an item, PushAsync a new page with no Navigation bar, but I have InteractivePopGestureRecognizer enabled so the user can just swipe "back" in the navigation. Most of the time it works, but the gif you see in the above link happens and I do not know why.
I have NavigationPage.SetHasNavigationBar(this, false); on the page itself...
and its renderer...
[assembly: ExportRenderer(typeof(ChannelPage), typeof(ChannelPageCustomRenderer))] namespace MyApp.iOS { public class ChannelPageCustomRenderer : PageRenderer, IUIGestureRecognizerDelegate { public ChannelPageCustomRenderer() {} public override void ViewWillAppear(bool animated) { base.ViewWillAppear(animated); ViewController.NavigationController.InteractivePopGestureRecognizer.Enabled = true; ViewController.NavigationController.InteractivePopGestureRecognizer.Delegate = new UIGestureRecognizerDelegate(); } } }
Direct link to gif: http://i.imgur.com/F3zBwH3.gifv
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Where is whitespace between burger icon and search bar coming from?
How can I get the SearchBar to appear immediately right of the hamburger icon (please see image), where is the white space coming from? I cant find it.
Iv set stackLayout and SearchBar inside NavigationPage to `HorizontalOptions="StartAndExpand" VerticalOptions="StartAndExpand"
is it from padding from the burgerIcon button. How can I check, I cant find it either in the code?
Thanks for any replies
<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"x:Class="WineShop.Views.Products">
<NavigationPage.TitleView>
<StackLayout HorizontalOptions="StartAndExpand" VerticalOptions="StartAndExpand" Orientation="Horizontal">
<SearchBar x:Name="SearchBar" TextChanged="SearchBar_TextChanged" HorizontalOptions="StartAndExpand" Placeholder="Search..." PlaceholderColor="Gray" TextColor="White" VerticalOptions="StartAndExpand"/>
</StackLayout>
</NavigationPage.TitleView>
<ContentPage.ToolbarItems>
<ToolbarItem Name="shoppingCartImg" Icon="shoppingCartImg.png" Priority="0" Order="Primary" Activated="ShoppingCartClicked"/>
<ToolbarItem Text="{Binding NoItemsInShoppingCart}" Priority="0" Order="Primary" Activated="ShoppingCartClicked"/>
</ContentPage.ToolbarItems>
<ContentPage.Content>
<Grid>
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Allow a single place to handle back button requests with Async support
Summary
Currently there are different ways to handle the back button request (understandable), but for example on Android one must handle the hardware and software button separably(software one is a bit hacky). Can we look into a possible solution to bring all these into one callback? i.e. App.cs OnBackButton event or virtual method.
API Changes
A addition of a virtual Task of bool method on App.cs
protected override Task OnBackButtonAsync(BackButtonArgs args)
{
return OnBackButtonAsync(args);
}
Or a Request page Pop method on on App.cs
protected override Task OnPagePoppingAsync(Page page)
{
return OnPagePoppingAsync(page);
}
Intended Use Case
To check if there are any unsaved changes on a page by either method :
protected override async Task OnBackButtonAsync(BackButtonArgs args)
{
var page = Args.Page;
var viewmodel = page.BindingContext as Viewmodel;
var result = await viewmodel.CheckUnSavedChangesAsync();
return result ;
}
Or a Request page Pop method on on App.cs
protected override async Task OnPagePoppingAsync(Page page)
{
var viewmodel = page.BindingContext as Viewmodel;
var result = await viewmodel.CheckUnSavedChangesAsync();
return result ;
}
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Alternative way to get variable in code behind without x:Name
Hi All,
Quick question I know it might sound stupid but I've been creating XAML pages a lot but now I want to try to approach it from using a JSON data to create a form based layout. So I have created a JSON and its classes and populated it with dummy data. the JSON has load of questions and a field to determine what the control will be (Entry, Datepicker, Picker, Editor etc etc.) I create the layout on load but when i create a button at the bottom to send that data back into a JSON object to upload to an API I am not sure how to get that form data back as you cant set the x:Name property in code behind and in my save function it can't see the control variable. I hope this makes sense and below is my code i use to bring back the form layout.
`public void LoadFormTemplate()
{
var generate = new CreateDummyData().CreateTestData();
var ParentLayout = new StackLayout();
foreach (Questions q in generate.Questions)
{
if (q.QuestionType == "Entry")
{
var ChildLayout = new Grid();
ChildLayout.Padding = new Thickness(20);
ChildLayout.ColumnDefinitions.Add(new ColumnDefinition());
ChildLayout.ColumnDefinitions.Add(new ColumnDefinition());
ChildLayout.RowDefinitions.Add(new RowDefinition());
Label label = new Label { Text = q.QuestionName };
Entry entry = new Entry { StyleId = "Question1Entry" };
Grid.SetRow(label, 0);
Grid.SetRow(entry, 0);
Grid.SetColumn(label, 0);
Grid.SetColumn(entry, 1);
ChildLayout.Children.Add(label);
ChildLayout.Children.Add(entry);
ParentLayout.Children.Add(ChildLayout);
}
else if (q.QuestionType == "Picker")
{
var ChildLayout = new Grid();
ChildLayout.Padding = new Thickness(20);
ChildLayout.ColumnDefinitions.Add(new ColumnDefinition());
ChildLayout.ColumnDefinitions.Add(new ColumnDefinition());
ChildLayout.RowDefinitions.Add(new RowDefinition());
Label label = new Label { Text = q.QuestionName };
Picker entry = new Picker();
foreach (Fields f in q.Fields)
{
entry.Items.Add(f.Field);
}
entry.Title = "Please Select";
Grid.SetRow(label, 0);
Grid.SetRow(entry, 0);
Grid.SetColumn(label, 0);
Grid.SetColumn(entry, 1);
ChildLayout.Children.Add(label);
ChildLayout.Children.Add(entry);
ParentLayout.Children.Add(ChildLayout);
}
else if (q.QuestionType == "DatePicker")
{
var ChildLayout = new Grid();
ChildLayout.Padding = new Thickness(20);
ChildLayout.ColumnDefinitions.Add(new ColumnDefinition());
ChildLayout.ColumnDefinitions.Add(new ColumnDefinition());
ChildLayout.RowDefinitions.Add(new RowDefinition());
Label label = new Label { Text = q.QuestionName };
DatePicker entry = new DatePicker { };
Grid.SetRow(label, 0);
Grid.SetRow(entry, 0);
Grid.SetColumn(label, 0);
Grid.SetColumn(entry, 1);
ChildLayout.Children.Add(label);
ChildLayout.Children.Add(entry);
ParentLayout.Children.Add(ChildLayout);
}
else if (q.QuestionType == "Editor")
{
var ChildLayout = new Grid();
ChildLayout.Padding = new Thickness(20);
ChildLayout.ColumnDefinitions.Add(new ColumnDefinition());
ChildLayout.RowDefinitions.Add(new RowDefinition());
ChildLayout.RowDefinitions.Add(new RowDefinition());
Label label = new Label { Text = q.QuestionName };
Editor entry = new Editor { HeightRequest = 100 };
Grid.SetRow(label, 0);
Grid.SetRow(entry, 1);
Grid.SetColumn(label, 0);
Grid.SetColumn(entry, 0);
entry.StyleId = "Editorquestion";
ChildLayout.Children.Add(label);
ChildLayout.Children.Add(entry);
ParentLayout.Children.Add(ChildLayout);
}
this.Content = ParentLayout;
}
var submit = new Button { Text = "Submit Vehicle Check" };
ParentLayout.Children.Add(submit);
submit.Clicked += SaveJson;
}
private async void SaveJson(object sender, EventArgs e)
{
var result = await DisplayAlert("Farmer","Are you sure you want to submit the vehicle check","Yes","No");
if (result)
{
}
}`
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Chart
I need to do chart like this
Does anyone have any idea what plugin I could use that doesn't cost a fortune?
Thankyou in advance,
Davide.
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Xamarin Date Slider Chart Control?
Hello 
I am looking for a control that does something similar to the image below. It is a date slider that has data for each day which displays as a chart and is selectable and clickable. Any ideas? Thank you!
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How to add an application to TestFlight using Xamarin Forms?
How to add an application to TestFlight using Xamarin Forms?
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can the urho scene background be transparent?
I created a scene to display 3d models using urhosharp
but it it like this:
it is black,can it be transparent?so it can display the lower views?only display the models?
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How to bind list in Content View?
Hello,
In my project, I'm adding one content page in that content page I'm binding some content views using DataTemplate now I want to add a new content view that has list bindings on all of the above content views. I tried but the data not binding.
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Firebase push notification message different languages
How I could display push notifications firebase messages in the same language as the phone.
If my backend sends Title="Hello" Body="Hi World", I want this message to be displayed in the configured language of the phone.
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how to Detect Touch event EVERYWHERE !?
Hello,
i created a View component that i use in every page of my application mobile.
in this view component i want to detect every touch on the root page ( i know how to detect touch on my component by adding GestureRecognizers )
i think it's possible to handle this information because in debug mode every time i touch the screen a line on the console appear :
07-26 10:24:17.541 I/ViewRootImpl(29702): ViewRoot's Touch Event : ACTION_UP
07-26 10:24:18.149 I/ViewRootImpl(29702): ViewRoot's Touch Event : ACTION_DOWN
so if i could handle this event in my application ... but i don't know how !
Thx to help me ^^
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How to slowdown sensor speed? (gyroscope, accelerometer..)
Hi, I am working on my own inactivity monitor and I am using now gyroscope sensor to get data.
My code:
public void StartGyroscope()
{
SensorSpeed speed = SensorSpeed.Default;
Xamarin.Essentials.Gyroscope.Start(speed);
GyroscopeReadData();
}
private void GyroscopeReadData()
{
Xamarin.Essentials.Gyroscope.ReadingChanged += Gyroscope_ReadingChanged;
}
void Gyroscope_ReadingChanged(object sender, GyroscopeChangedEventArgs e)
{
var data = e.Reading;
var accX = data.AngularVelocity.X.ToString();
var accY = data.AngularVelocity.Y.ToString();
var accZ = data.AngularVelocity.Z.ToString();
...
}
This is working good, but for me it is too fast. My variables accX, accY... changing aprox 10x per second. I read, that instead of Sensor.Speed.Default I can use int in milisecond, but when I try this:
Xamarin.Essentials.Gyroscope.Start(1000);
I get error:
cannot convert from 'int' to 'Xamarin.Essentials.SensorSpeed'
Maybe someone know, how to set this milisecond or how to simply get data from sensor every 1 second?
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Tab key not listening for CustomViewRenderer in Xamarin forms iOS
I have a xamarin forms grid and a written custom renderer for that grid in xamarin forms iOS platform. And applied BecomeFirstResposnder to that CustomRenderer on OnElementPropertyChanged. Added UIKeyCommand "\t " to the UIViewController. UpArrow,DownArrow, LeftArrow every key is listening except Tab and Shift+Tab Key. Kindly, please help me.
//CustomRenderer for Xamarin Forms Grid
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
this.BecomeFirstResponder();
if (this.KeyPageRenderer == null)
{
this.KeyPageRenderer = this.GetSfPageRenderer(this.GetControl());
if (this.KeyPageRenderer != null)
{
UIKeyCommand KeyTab = UIKeyCommand.Create(new NSString("\t"), 0, new ObjCRuntime.Selector("KeyRecV:"));
this.KeyPageRenderer.AddKeyCommand(KeyTab);
}
}
}
internal UIViewController GetSfPageRenderer(UIView view)
{
if (view != null)
{
var responder = (UIResponder)view;
while (responder != null && !(responder is UIViewController))
{
responder = responder.NextResponder;
}
return responder as UIViewController;
}
return null;
}
public override bool CanBecomeFirstResponder
{
get
{
return true;
}
}
[Export("KeyRecV:")]
private void Excute(UIKeyCommand keyCommand)
{
if ((keyCommand.Input as NSObject).Description == "\t")
{
}
}
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How to get child element access of collection view without using mvvm in xamarin forms?
this is my code:
<StackLayout HeightRequest="40" VerticalOptions="FillAndExpand" WidthRequest="40"> <Label FontSize="16" HorizontalOptions="Center" Text="+" TextColor="Black" VerticalOptions="CenterAndExpand" VerticalTextAlignment="Center"> <Label.FontFamily> <OnPlatform x:TypeArguments="x:String"> <On Platform="Android" Value="SFPro.ttf#Bold" /> </OnPlatform> </Label.FontFamily> </Label> <StackLayout.GestureRecognizers> <TapGestureRecognizer Tapped="TapGestureRecognizer_Tapped" /> </StackLayout.GestureRecognizers></StackLayout>
<StackLayout HeightRequest="40" VerticalOptions="FillAndExpand" WidthRequest="40"> <Label FontSize="16" HorizontalOptions="Center" Text="{Binding prod_qty}" x:Name="lblqty" TextColor="#00C569" VerticalOptions="CenterAndExpand" VerticalTextAlignment="Center"> <Label.FontFamily> <OnPlatform x:TypeArguments="x:String"> <On Platform="Android" Value="SFPro.ttf#Bold" /> </OnPlatform> </Label.FontFamily> </Label> </StackLayout>
This code is in collection view i am generating a source in .cs file and have set the source to its collection view. i want to access and modify lbl_qty value by clicking TapGestureRecognizer_Tapped but i don't know mvvm right now. please help.
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Change SrollPosition in CollectionVIew
Is it possible to set a specific scroll position? Without to use an item.
Example scroll to e.VerticalOffset=100;
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Xamarin UITextView Binding in Code
We are developping a xamarin forms app in VS2019 where we require the rtf funcionality of the native UITextView. We implemented this with an interface and a platform implementation as shown below - which works fine. What we are missing is how to bind this view to the viewmodel - as the UI view is added to the view page in code. Would appreciate some advice.
UITextView textView = new UITextView {AllowsEditingTextAttributes = true};
var rtfstring = new NSAttributedString(rtfstring, new NSAttributedStringDocumentAttributes { DocumentType = NSDocumentType.RTF }, ref error);
textView.AttributedText = rtfstring;
stackLayout.Children.Add(textView);
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Shell.SearchHandler ERROR. BUG?
Hi, after updating to xforms 5, SearchHandler incorrectly displays ...
Tested on emulator and on physical device, with android 9, 10, 11.
I also downloaded the updated xanimals example and the error is present.
It doesn't happen with xforms 4.8.
Tips?
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Xamarin UITextView Binding in Code
We are developping a xamarin forms app in VS2019 where we require the rtf funcionality of the native UITextView. We implemented this with an interface and a platform implementation as shown below - which works fine. What we are missing is how to bind this view to the viewmodel - as the UI view is added to the view page in code. Would appreciate some advice.
UITextView textView = new UITextView {AllowsEditingTextAttributes = true};
var rtfstring = new NSAttributedString(rtfstring, new NSAttributedStringDocumentAttributes { DocumentType = NSDocumentType.RTF }, ref error);
textView.AttributedText = rtfstring;
stackLayout.Children.Add(textView);
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