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Xamarin.Forms | Xamarin.Forms Official Home | Form library

 by   xamarin C# Version: release-5.0.0-sr10 License: Non-SPDX

 by   xamarin C# Version: release-5.0.0-sr10 License: Non-SPDX

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kandi X-RAY | Xamarin.Forms Summary

Xamarin.Forms is a C# library typically used in User Interface, Form, Xamarin applications. Xamarin.Forms has no bugs, it has no vulnerabilities and it has medium support. However Xamarin.Forms has a Non-SPDX License. You can download it from GitHub.
Xamarin.Forms provides a way to quickly build native apps for iOS, Android, Windows and macOS, completely in C#. Read more about the platform at https://www.xamarin.com/forms.
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kandi-support Support

  • Xamarin.Forms has a medium active ecosystem.
  • It has 5556 star(s) with 1922 fork(s). There are 438 watchers for this library.
  • There were 5 major release(s) in the last 12 months.
  • There are 2795 open issues and 6800 have been closed. On average issues are closed in 154 days. There are 103 open pull requests and 0 closed requests.
  • It has a neutral sentiment in the developer community.
  • The latest version of Xamarin.Forms is release-5.0.0-sr10
Xamarin.Forms Support
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quality kandi Quality

  • Xamarin.Forms has 0 bugs and 0 code smells.
Xamarin.Forms Quality
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Xamarin.Forms Quality
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securitySecurity

  • Xamarin.Forms has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
  • Xamarin.Forms code analysis shows 0 unresolved vulnerabilities.
  • There are 0 security hotspots that need review.
Xamarin.Forms Security
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Xamarin.Forms Security
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license License

  • Xamarin.Forms has a Non-SPDX License.
  • Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.
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buildReuse

  • Xamarin.Forms releases are available to install and integrate.
  • Installation instructions, examples and code snippets are available.
  • Xamarin.Forms saves you 1038 person hours of effort in developing the same functionality from scratch.
  • It has 2356 lines of code, 11 functions and 5045 files.
  • It has high code complexity. Code complexity directly impacts maintainability of the code.
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Xamarin.Forms Key Features

Xamarin.Forms Official Home

Packages

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<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <packageSources>
    <clear />
    <add key="xamarin-ci" value="https://aka.ms/xf-nightly/index.json" />
    <add key="NuGet.org" value="https://api.nuget.org/v3/index.json" />
  </packageSources>
</configuration>

Windows

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build.cmd -Target provision

Mac

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./build.sh --target vsmac

requestReview() deprecated in iOS 14, Alternative for xamarin.forms?

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 public interface MyInterface
{
     void RequestReview();
}
[assembly: Dependency(typeof(MyInterfaceImpl))]
namespace App19.iOS
{
    public class MyInterfaceImpl : MyInterface
    {
        public void RequestReview()
        {
           var myv = UIDevice.CurrentDevice.CheckSystemVersion(14, 0);
            if (myv)
            {
                UIWindow window = UIApplication.SharedApplication.Delegate.GetWindow();
            SKStoreReviewController.RequestReview(window.WindowScene);
            }
            else 
            {
                SKStoreReviewController.RequestReview();
            }
        }
    }
}
 protected override void OnStart()
    {
        if (Device.RuntimePlatform == Device.iOS)
        {
            DependencyService.Get<IReviewService>().RequestReview();
        }
    }
-----------------------
 public interface MyInterface
{
     void RequestReview();
}
[assembly: Dependency(typeof(MyInterfaceImpl))]
namespace App19.iOS
{
    public class MyInterfaceImpl : MyInterface
    {
        public void RequestReview()
        {
           var myv = UIDevice.CurrentDevice.CheckSystemVersion(14, 0);
            if (myv)
            {
                UIWindow window = UIApplication.SharedApplication.Delegate.GetWindow();
            SKStoreReviewController.RequestReview(window.WindowScene);
            }
            else 
            {
                SKStoreReviewController.RequestReview();
            }
        }
    }
}
 protected override void OnStart()
    {
        if (Device.RuntimePlatform == Device.iOS)
        {
            DependencyService.Get<IReviewService>().RequestReview();
        }
    }
-----------------------
 public interface MyInterface
{
     void RequestReview();
}
[assembly: Dependency(typeof(MyInterfaceImpl))]
namespace App19.iOS
{
    public class MyInterfaceImpl : MyInterface
    {
        public void RequestReview()
        {
           var myv = UIDevice.CurrentDevice.CheckSystemVersion(14, 0);
            if (myv)
            {
                UIWindow window = UIApplication.SharedApplication.Delegate.GetWindow();
            SKStoreReviewController.RequestReview(window.WindowScene);
            }
            else 
            {
                SKStoreReviewController.RequestReview();
            }
        }
    }
}
 protected override void OnStart()
    {
        if (Device.RuntimePlatform == Device.iOS)
        {
            DependencyService.Get<IReviewService>().RequestReview();
        }
    }
-----------------------
using StoreKit;
using UIKit;

public void RequestReview(){
    var scene = UIApplication.SharedApplication.KeyWindow.WindowScene;

    if (scene is null)
    {
        //handle the scene being null here
        return;
    }

    SKStoreReviewController.RequestReview(scene);
}
var scene = UIApplication.SharedApplication.KeyWindow.WindowScene;

var alsoScene = UIApplication.SharedApplication.Delegate.GetWindow()?.WindowScene;
using StoreKit;
using UIKit;

public void RequestReview()
{
    var isIos14OrAbove = UIDevice.CurrentDevice.CheckSystemVersion(14, 0);
    if (isIos14OrAbove)
    {
        var scene = UIApplication.SharedApplication.KeyWindow.WindowScene;

        if (scene is null)
        {
            //handle the scene being null here
            return;
        }

        SKStoreReviewController.RequestReview(scene);
    }
    else
    {
        SKStoreReviewController.RequestReview();
    }
}
-----------------------
using StoreKit;
using UIKit;

public void RequestReview(){
    var scene = UIApplication.SharedApplication.KeyWindow.WindowScene;

    if (scene is null)
    {
        //handle the scene being null here
        return;
    }

    SKStoreReviewController.RequestReview(scene);
}
var scene = UIApplication.SharedApplication.KeyWindow.WindowScene;

var alsoScene = UIApplication.SharedApplication.Delegate.GetWindow()?.WindowScene;
using StoreKit;
using UIKit;

public void RequestReview()
{
    var isIos14OrAbove = UIDevice.CurrentDevice.CheckSystemVersion(14, 0);
    if (isIos14OrAbove)
    {
        var scene = UIApplication.SharedApplication.KeyWindow.WindowScene;

        if (scene is null)
        {
            //handle the scene being null here
            return;
        }

        SKStoreReviewController.RequestReview(scene);
    }
    else
    {
        SKStoreReviewController.RequestReview();
    }
}
-----------------------
using StoreKit;
using UIKit;

public void RequestReview(){
    var scene = UIApplication.SharedApplication.KeyWindow.WindowScene;

    if (scene is null)
    {
        //handle the scene being null here
        return;
    }

    SKStoreReviewController.RequestReview(scene);
}
var scene = UIApplication.SharedApplication.KeyWindow.WindowScene;

var alsoScene = UIApplication.SharedApplication.Delegate.GetWindow()?.WindowScene;
using StoreKit;
using UIKit;

public void RequestReview()
{
    var isIos14OrAbove = UIDevice.CurrentDevice.CheckSystemVersion(14, 0);
    if (isIos14OrAbove)
    {
        var scene = UIApplication.SharedApplication.KeyWindow.WindowScene;

        if (scene is null)
        {
            //handle the scene being null here
            return;
        }

        SKStoreReviewController.RequestReview(scene);
    }
    else
    {
        SKStoreReviewController.RequestReview();
    }
}

Azure Pipelines Xamarin.Forms iOS build fails with error MSB4057: The target &quot;_IsProjectRestoreSupported&quot; does not exist in the project

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- task: MSBuild@1
  inputs:
    solution: 'App.sln'
    configuration: 'Release'
    msbuildArguments: /t:restore

Xamarin What happens to Lazy initialized singleton after App goes to background

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public sealed class DataSingleton {
  private static instance;

  // will assign new DataSingleton only if "instance" is null.
  public static Instance => instance ??= new DataSingleton();
}
public sealed class DataSingleton {
  private static instance;
  public static Instance {
    get {
      var result = instance;

      // early exit if singleton is already initialized
      if (result is not null) return result;

      var created = new DataSingleton();
      // thread-safe way how to assign "created" into "instance" only if "instance" refers to null. othervise no assignment will be made
      var original = Interlocked.CompareExchange(ref instance, null, created);

      // some other thread already initialized singleton
      if (original is not null) return original;

      // return newly created instance
      return result;
    }
  }
}
public sealed class DataSingleton {
  private static instance;
  public static Instance {
    get {
      var result = instance;

      // early exit if singleton is already initialized
      if (result is not null) return result;

      lock(typeof(DataSingleton)) {
        result = instance;

        // double check, if instance was not initialized by another thread
        if (result is not null) return result;
    
        return instance = new DataSingleton();
      }
    }
  }
}
-----------------------
public sealed class DataSingleton {
  private static instance;

  // will assign new DataSingleton only if "instance" is null.
  public static Instance => instance ??= new DataSingleton();
}
public sealed class DataSingleton {
  private static instance;
  public static Instance {
    get {
      var result = instance;

      // early exit if singleton is already initialized
      if (result is not null) return result;

      var created = new DataSingleton();
      // thread-safe way how to assign "created" into "instance" only if "instance" refers to null. othervise no assignment will be made
      var original = Interlocked.CompareExchange(ref instance, null, created);

      // some other thread already initialized singleton
      if (original is not null) return original;

      // return newly created instance
      return result;
    }
  }
}
public sealed class DataSingleton {
  private static instance;
  public static Instance {
    get {
      var result = instance;

      // early exit if singleton is already initialized
      if (result is not null) return result;

      lock(typeof(DataSingleton)) {
        result = instance;

        // double check, if instance was not initialized by another thread
        if (result is not null) return result;
    
        return instance = new DataSingleton();
      }
    }
  }
}
-----------------------
public sealed class DataSingleton {
  private static instance;

  // will assign new DataSingleton only if "instance" is null.
  public static Instance => instance ??= new DataSingleton();
}
public sealed class DataSingleton {
  private static instance;
  public static Instance {
    get {
      var result = instance;

      // early exit if singleton is already initialized
      if (result is not null) return result;

      var created = new DataSingleton();
      // thread-safe way how to assign "created" into "instance" only if "instance" refers to null. othervise no assignment will be made
      var original = Interlocked.CompareExchange(ref instance, null, created);

      // some other thread already initialized singleton
      if (original is not null) return original;

      // return newly created instance
      return result;
    }
  }
}
public sealed class DataSingleton {
  private static instance;
  public static Instance {
    get {
      var result = instance;

      // early exit if singleton is already initialized
      if (result is not null) return result;

      lock(typeof(DataSingleton)) {
        result = instance;

        // double check, if instance was not initialized by another thread
        if (result is not null) return result;
    
        return instance = new DataSingleton();
      }
    }
  }
}
-----------------------
public static Webserver MyWebServer
{
    get
    {
        if (_server == null)
        {
            _server = new Webserver(...);
        }

        return _server;
    }
}
public static void StopWebServer()
{
    if (_server != null)
    {
        _server.Dispose();
        // So will be created again, on next reference to MyWebServer.
        _server = null;
    }
}
private static Webserver _server;

...

protected override void OnSleep()
{
    StopWebServer();
}
... App.MyWebServer ...
... (Xamarin.Forms.Application.Current as App).MyWebServer ...
-----------------------
public static Webserver MyWebServer
{
    get
    {
        if (_server == null)
        {
            _server = new Webserver(...);
        }

        return _server;
    }
}
public static void StopWebServer()
{
    if (_server != null)
    {
        _server.Dispose();
        // So will be created again, on next reference to MyWebServer.
        _server = null;
    }
}
private static Webserver _server;

...

protected override void OnSleep()
{
    StopWebServer();
}
... App.MyWebServer ...
... (Xamarin.Forms.Application.Current as App).MyWebServer ...
-----------------------
public static Webserver MyWebServer
{
    get
    {
        if (_server == null)
        {
            _server = new Webserver(...);
        }

        return _server;
    }
}
public static void StopWebServer()
{
    if (_server != null)
    {
        _server.Dispose();
        // So will be created again, on next reference to MyWebServer.
        _server = null;
    }
}
private static Webserver _server;

...

protected override void OnSleep()
{
    StopWebServer();
}
... App.MyWebServer ...
... (Xamarin.Forms.Application.Current as App).MyWebServer ...

Binding property in Xamarin.Forms using MVVM

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                            <Image RelativeLayout.WidthConstraint="{ConstraintExpression Constant=64}" 
                                   RelativeLayout.HeightConstraint="{ConstraintExpression Constant=64}" 
                                   RelativeLayout.XConstraint="{Binding X}" 
                                   RelativeLayout.YConstraint="{Binding Y}" 
                                   Source="nuclearbomb.png" />

Xamarin Forms Android Error inflating class MaterialCalendarGridView

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<?xml version="1.0" encoding="UTF-8"?>
<resources>
    <style name="MyAppTheme" parent="Theme.MaterialComponents.Light">
        <item name="android:colorPrimary">#ec1a23</item>
        <item name="android:colorPrimaryDark">#dd2c00</item>
        <item name="android:colorAccent">#ff3d00</item>
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
  </style>
    <style name="Theme.Splash" parent="Theme.MaterialComponents.Light">
        <item name="android:windowBackground">@drawable/splashscreen</item>
        <item name="android:windowNoTitle">true</item>
    </style>
</resources>

Method 'UIKit.UIApplication.Main' is obsolete: Use the overload with 'Type' instead of 'String' parameters for type safety

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UIApplication.Main(args, null, "AppDelegate");
UIApplication.Main(args, null, typeof(AppDelegate));
-----------------------
UIApplication.Main(args, null, "AppDelegate");
UIApplication.Main(args, null, typeof(AppDelegate));

Why awaiting in App.OnStart() before setting the MainPage property doesn't load main page

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public class Program
{
    public static void Main()
    {
        var app = new Application();
        app.Start();
    }
}

class Application
{
    public string MainPage { get; set; }
    protected virtual void OnStart()
    {

    }

    public void Start()
    {
        Console.WriteLine("calling OnStart");
        // can't await or anything here, it returns void
        OnStart();

        Console.WriteLine("OnStart called");
        // now we consider initialization is done and check MainPage
        if (MainPage != null)
        {
            Console.WriteLine(MainPage);
        }
        Console.WriteLine("Initialization done");
    }
}

class MyApplication : Application
{
    protected override async void OnStart()
    {
        await Task.Delay(100);
        // we set MainPage but it's too late
        MainPage = "Hello";
    }
}

CollectionView, SelectedItems=&quot;{Binding SelectedElement, Mode=TwoWay}&quot; Didn't work

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<CollectionView ... SelectionChangedCommand="{Binding SelectionChangedCommand}" ...>
    // There's no point in customizing this setter, because it won't get called when you want it to.
    public IList<object> SelectedElement { get; set; }

    // in constructor:
         SelectionChangedCommand = new Command(SelectionChanged);

    public Command SelectionChangedCommand { get; set; }

    private void SelectionChanged(object obj)
    {
        if (SelectedElement != null && SelectedElement.Count > 0) {
            var element = SelectedElement[0] as Element;
            ...
        }
    }
-----------------------
<CollectionView ... SelectionChangedCommand="{Binding SelectionChangedCommand}" ...>
    // There's no point in customizing this setter, because it won't get called when you want it to.
    public IList<object> SelectedElement { get; set; }

    // in constructor:
         SelectionChangedCommand = new Command(SelectionChanged);

    public Command SelectionChangedCommand { get; set; }

    private void SelectionChanged(object obj)
    {
        if (SelectedElement != null && SelectedElement.Count > 0) {
            var element = SelectedElement[0] as Element;
            ...
        }
    }
-----------------------
SelectionChangedCommandParameter="{Binding .}

Cannot scroll xaml page created with Xamarin.Forms on mobile device

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            mc:Ignorable="d"
            x:Class="CXFMob.OperatiPage">

<ScrollView>
<StackLayout x:Name="stack1" ...

        </StackLayout>
</StackLayout>
</ScrollView>
-----------------------
            mc:Ignorable="d"
            x:Class="CXFMob.OperatiPage">

<ScrollView>
<StackLayout x:Name="stack1" ...

        </StackLayout>
</StackLayout>
</ScrollView>

the &quot;tapped&quot; method of TapGestureRecognizer can not be fired in contentView in UWP project

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<AbsoluteLayout Grid.Row="0" IsEnabled="False">
    <Label
        x:Name="CurrentVersion"
        AbsoluteLayout.LayoutBounds="0,0,75,75"
        AbsoluteLayout.LayoutFlags="PositionProportional" />
    <StackLayout AbsoluteLayout.LayoutBounds="1,0,100,100" AbsoluteLayout.LayoutFlags="PositionProportional">
        <Image x:Name="BrandImage" />
    </StackLayout>
</AbsoluteLayout>

Community Discussions

Trending Discussions on Xamarin.Forms
  • INotifyPropertyChanged vs BindableObject vs ObservableObject in Xamarin.Forms/MAUI
  • requestReview() deprecated in iOS 14, Alternative for xamarin.forms?
  • Azure Pipelines Xamarin.Forms iOS build fails with error MSB4057: The target &quot;_IsProjectRestoreSupported&quot; does not exist in the project
  • Xamarin What happens to Lazy initialized singleton after App goes to background
  • Binding property in Xamarin.Forms using MVVM
  • Xamarin Forms Android Error inflating class MaterialCalendarGridView
  • Honor. Exception after updating system
  • Method 'UIKit.UIApplication.Main' is obsolete: Use the overload with 'Type' instead of 'String' parameters for type safety
  • Why awaiting in App.OnStart() before setting the MainPage property doesn't load main page
  • CollectionView, SelectedItems=&quot;{Binding SelectedElement, Mode=TwoWay}&quot; Didn't work
Trending Discussions on Xamarin.Forms

QUESTION

INotifyPropertyChanged vs BindableObject vs ObservableObject in Xamarin.Forms/MAUI

Asked 2022-Feb-23 at 13:23

I have a hard time understanding the difference between those 3 things when creating a project using Xamarin.Forms or MAUI. I know what these are - INotifyPropertyChanged is an interface you need to implement when you want to use bindings in XAML, BindableObject is Xamarin.Forms class that implements said interface and ObservableObject is a class found in Xamarin Community Toolkit that also implements that interface. I just don't really understand the differences between them (especially the latter two) and when you would use any of them? I have read different tutorials and they all say different things - that you need to implement the interface yourself (so your viewmodel implements it), that your viewmodel needs to inherit from BindableObject, or - if you're using Xamarin Community Toolkit (which you probably should use/are using) - inherit from ObservableObject. But - like I said - why should you use any of the solutions mentioned above over the others?

If you implement INotifyPropertyChanged interface Visual Studio (or ReSharper extension, I'm not sure which one) automatically implements the method it needs to and adds this code:

public event PropertyChangedEventHandler PropertyChanged;

protected virtual void PropertyChanged([CallerMemberName] string propertyName = null)
{
    PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}

But it makes your code longer/uglier, so I understand why you would want to only inherit from a class that already implements that interface. But then why some people say you should always implement it yourself? Is there a difference when you implement it yourself or inherit from a class that already implements it? Also, if you decide to inherit from a class - why use either one over the other one? The documentation of Xamarin.Forms is quite good in this regard, but it doesn't acknowledge the existence of Xamarin Community Toolkit and the Xamarin Community Toolkit documentation doesn't answer my question and doesn't say why you should use their ObservableObject over Xamarin.Form's built-in BindableObject.

ANSWER

Answered 2022-Feb-23 at 12:53

There is some confusion I think about the different classes:

  • Xamarin.Forms.BindableObject is meant to be used to create something like a custom view with bindable properties. It also implements INotifyPropertyChanged, but I don't think you should use it for a ViewModel.

  • The ObservableObject from the community toolkit can be used as a base class for any class you like to use with data binding, you don't need to implement it yourself.

  • If you have some custom requirements for handling the OnPropertyChanged, you do need to implement the interface yourself, but if you just want to have default behaviour, ObservableObject is perfectly fine.

Source https://stackoverflow.com/questions/71236324

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install Xamarin.Forms

For both methods underneath you will have to add this NuGet feed for the build to succeed. See this documentation page to find out how.

Support

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