Xamarin.Forms 2.1.0.6521

Build native UIs for iOS, Android, and Windows Phone from a single, shared C# codebase

There is a newer version of this package available.
See the version list below for details.
Install-Package Xamarin.Forms -Version 2.1.0.6521
dotnet add package Xamarin.Forms --version 2.1.0.6521
<PackageReference Include="Xamarin.Forms" Version="2.1.0.6521" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Xamarin.Forms --version 2.1.0.6521
The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Release Notes

## New Features ##

### ControlTemplates ###

ControlTemplates have been introduced into the 2.1.0 branch, and have been included on the following types:

- [`ContentPage`](https://developer.xamarin.com/api/type/Xamarin.Forms.ContentPage/)
- [`ContentView`](https://developer.xamarin.com/api/type/Xamarin.Forms.ContentView/)
- `TemplatedPage`
- `TemplatedView`

`TemplatedPage` and `TemplatedView` now serve as the base class for `ContentPage` and `ContentView`. ControlTemplates can be used to define the visual appearance of a Control or [`Page`](http://developer.xamarin.com/api/type/Xamarin.Forms.Page/) while providing a clean separation from the visual hierarchy and the Content itself. ControlTemplates can be applied via Style to greatly expand themeability in Xamarin.Forms.

Along with ControlTemplates the concept of TemplateBindings has been introduced. TemplateBindings work identically to normal Bindings however their Source is automatically set to the parent of the target view which owns the ControlTemplate. Usage of a TemplateBinding outside of a ControlTemplate is not supported.

For more details on how to use ControlTemplates see here: http://xfcomplete.net/general/2016/01/20/control-templates/

### DataTemplateSelector ###

IDataTemplateSelectors allow the selection of a DataTemplate at runtime per item in a ListView.ItemsSource.

Usage:

```csharp
class MyDataTemplateSelector : DataTemplateSelector
{
public MyDataTemplateSelector ()
{
// Retain instances!
this.templateOne = new DataTemplate (typeof (ViewA));
this.templateTwo = new DataTemplate (typeof (ViewB));
}

protected override DataTemplate OnSelectTemplate (object item, BindableObject container)
{
if (item is double)
return this.templateOne;
return this.templateTwo;
}

private readonly DataTemplate templateOne;
private readonly DataTemplate templateTwo;
}
```

```xml
<ListView DataTemplate=local:MyDataTemplateSelector />
```

DataTemplateSelectors have the following limitations:

- No more than 20 templates per ListView on Android
- The DataTemplateSelector subclass MUST always return the same template for the same data if queried multiple times
- The DataTemplateSelector must not return another DataTemplateSelector
- The DataTemplateSelector must not return new instances of a DataTemplate on each call, instead the same instance must be returned. Failure to do so will effectively disable virtualization and lead to an enormous memory leak. Don't do this.

### Effects ###

Effects provide an easy way to customize the native look and feel of controls without having to resort to a complete Custom Renderer.   You can use these to customize the native controls, for example, the following Effect shows how to create a Border effect on iOS that will set a 2 pixel purple outline on the control:

```csharp
// located inside iOS specific codebase
public class BorderEffect : PlatformEffect
{
protected override void OnAttached ()
{
Control.Layer.BorderColor = UIColor.Purple.CGColor;
Control.Layer.BorderWidth = 2;
}

protected override void OnDetached ()
{
Control.Layer.BorderWidth = 0;
}
}
```

To apply this effect, all you have to do is attached it via the `IList<Effect> Effects` collection on Element.   This is a much simpler way of fine tuning your user interface with native touches.

### Other Improvements ###

- HasUnevenRows dynamic sizing support;
- ListView Virtualization is now supported on Windows ;
- Generic versions of Create () BindableProperty are no longer supported and deprecated;
- The Entry/Editor updates on WP8 and WinRT are now consistent with other platforms;

## Bug Fixes ##

- [Bug 21780](https://bugzilla.xamarin.com/show_bug.cgi?id=21780) - Windows Phone Editor control has black background with black text, background turns to white when editing.
- [Bug 24769](https://bugzilla.xamarin.com/show_bug.cgi?id=24769) - [Win Phone/winrt] Progress Bar in listview item not working
- [Bug 26868](https://bugzilla.xamarin.com/show_bug.cgi?id=26868) - GroupHeaders do not extend on Windows Phone and WINRT
- [Bug 30370](https://bugzilla.xamarin.com/show_bug.cgi?id=30370) - Background Color on an Entry Control is Applied to the Padding
- [Bug 32615](https://bugzilla.xamarin.com/show_bug.cgi?id=32615) - [Android] OnAppearing is not called on previous page when modal page is popped
- [Bug 32847](https://bugzilla.xamarin.com/show_bug.cgi?id=32847) - Picker text is cleared after selecting an item, whether Picker, DatePicker, or TimePicker
- [Bug 33268](https://bugzilla.xamarin.com/show_bug.cgi?id=33268) - Picker is broken on Windows 8.1
- [Bug 33870](https://bugzilla.xamarin.com/show_bug.cgi?id=33870) - crash when the listview selection is disabled on Windows Phone 8.1 RT
- [Bug 35490](https://bugzilla.xamarin.com/show_bug.cgi?id=35490) - Label Text Misaligned in Windows Phone 8.1 and WinRT (Xamarin Nuget Version 1.5.1.6471)
- [Bug 35811](https://bugzilla.xamarin.com/show_bug.cgi?id=35811) - Navigation.PushAsync from TabbedPage then hit back button causes crash
- [Bug 36171](https://bugzilla.xamarin.com/show_bug.cgi?id=36171) - WinRT Entry UI not updating on TextChanged
- [Bug 36174](https://bugzilla.xamarin.com/show_bug.cgi?id=36174) - Android Search Bar vertical text alignment in Forms 2.0
- [Bug 36251](https://bugzilla.xamarin.com/show_bug.cgi?id=36251) - Issues when switching between pages of a TabbedPage on iOS
- [Bug 36422](https://bugzilla.xamarin.com/show_bug.cgi?id=36422) - XamlC Fails When using X:Array in Xaml. Throws NullReferenceExceptio
- [Bug 36559](https://bugzilla.xamarin.com/show_bug.cgi?id=36559) - [WP] Navigating to a ContentPage with a Grid inside a TableView affects Entry heights
- [Bug 36649](https://bugzilla.xamarin.com/show_bug.cgi?id=36649) - LineBreakMode.NoWrap is handled incorrectly on Windows Phone 8.1 RT
- [Bug 36687](https://bugzilla.xamarin.com/show_bug.cgi?id=36687) - On WinPhone 8.1 RT, the background color used in Entry fields is not as expected
- [Bug 36730](https://bugzilla.xamarin.com/show_bug.cgi?id=36730) - OnStart / OnResume are not called on WP8.1 and UWP
- [Bug 36778](https://bugzilla.xamarin.com/show_bug.cgi?id=36778) - ListView on UWP doesn't display Detail line with TextCell
- [Bug 37306](https://bugzilla.xamarin.com/show_bug.cgi?id=37306) - XamlC doesn´t support adding x:String in resource dictionary
- [Bug 37675](https://bugzilla.xamarin.com/show_bug.cgi?id=37675) - Style PropertyChanged called before the Style is applied
- [Bug 37779](https://bugzilla.xamarin.com/show_bug.cgi?id=37779) - TabbedPageRenderer throws exceptions on Android 4.0.4 when using Material Design theme
- Fixes to OnAppearing/OnDisappearing;
- Fixes to PanGestureRecognizer on android;
- Fixes to animation safety;
- UWP fix headerzoom;
- Fixes an issue where images sometimes didn't load on WP8;


## Known Issues ##

- WinRT reloads toolbar items on navigation even when they haven't changed

Version History

Version Downloads Last updated
4.0.0.425677 14,699 5/14/2019
4.0.0.394984-pre10 6,959 5/3/2019
4.0.0.346134-pre9 7,319 4/18/2019
4.0.0.304370-pre8 7,448 4/3/2019
4.0.0.250467-pre7 5,055 3/20/2019
4.0.0.232914-pre6 6,009 3/14/2019
4.0.0.169046-pre5 5,282 2/21/2019
4.0.0.135214-pre4 4,043 2/6/2019
4.0.0.94569-pre3 3,863 1/24/2019
4.0.0.62955-pre2 11,728 1/10/2019
4.0.0.8055-pre1 12,170 12/4/2018
3.6.0.344457 71,805 4/18/2019
3.6.0.293080 51,488 4/3/2019
3.6.0.264807 83,861 3/19/2019
3.6.0.220655 66,912 3/6/2019
3.6.0.169048-pre2 448 2/21/2019
3.6.0.135200-pre1 3,757 2/6/2019
3.5.0.274416 4,444 3/26/2019
3.5.0.169047 57,725 2/20/2019
3.5.0.129452 72,369 2/6/2019
3.5.0.94564-pre3 1,021 1/24/2019
3.5.0.62956-pre2 852 1/10/2019
3.4.0.1039999 3,525 3/26/2019
3.4.0.1029999 68,364 1/24/2019
3.4.0.1009999 80,602 1/4/2019
3.4.0.1008975 341,030 11/15/2018
3.4.0.987044-pre2 2,213 11/8/2018
3.4.0.925479-pre1 8,793 10/18/2018
3.3.0.967583 144,133 11/1/2018
3.3.0.912540 99,638 10/18/2018
3.3.0.893527-pre3 5,989 10/11/2018
3.3.0.871608-pre2 9,305 10/1/2018
3.3.0.840541-pre1 4,641 9/20/2018
3.2.0.871581 87,607 10/3/2018
3.2.0.839982 112,610 9/17/2018
3.2.0.809874-pre3 3,443 9/10/2018
3.2.0.729530-pre2 10,755 8/14/2018
3.2.0.637442-pre1 8,801 7/17/2018
3.1.0.697729 302,063 8/1/2018
3.1.0.637273 93,661 7/11/2018
3.1.0.583944 126,727 6/20/2018
3.1.0.561732-pre4 5,915 6/11/2018
3.1.0.550168-pre3 2,899 6/6/2018
3.1.0.530888-pre2 1,763 6/4/2018
3.1.0.469394-pre1 11,029 5/9/2018
3.0.0.561731 138,060 6/11/2018
3.0.0.550146 26,102 6/6/2018
3.0.0.530893 19,924 6/4/2018
3.0.0.482510 214,508 5/14/2018
3.0.0.446417 117,787 5/1/2018
3.0.0.427558-pre4 8,720 4/25/2018
3.0.0.354232-pre3 13,504 4/5/2018
3.0.0.296286-pre2 8,122 3/20/2018
2.5.1.527436 80,277 5/4/2018
2.5.1.444934 155,729 4/4/2018
2.5.1.392594-pre3 4,136 3/21/2018
2.5.1.340284-pre2 5,938 3/9/2018
2.5.1.317207-pre1 5,609 3/1/2018
2.5.0.280555 306,685 2/16/2018
2.5.0.122203 311,578 12/18/2017
2.5.0.121934 200,868 11/28/2017
2.5.0.91635 129,336 11/16/2017
2.5.0.77107 28,454 11/13/2017
2.5.0.75255-pre3 5,380 11/10/2017
2.5.0.19271-pre2 9,170 10/20/2017
2.4.0.91020 44,852 11/16/2017
2.4.0.74863 34,099 11/10/2017
2.4.0.38779 59,035 10/30/2017
2.4.0.18342 54,636 10/20/2017
2.4.0.282 157,871 9/29/2017
2.4.0.280 188,415 9/27/2017
2.4.0.275-pre3 8,028 9/19/2017
2.4.0.269-pre2 13,550 8/29/2017
2.4.0.266-pre1 19,119 8/16/2017
2.3.5.256-pre6 34,825 6/29/2017
2.3.5.255-pre5 4,829 6/26/2017
2.3.5.239-pre3 27,665 5/11/2017
2.3.5.235-pre2 11,206 4/26/2017
2.3.5.233-pre1 9,052 4/13/2017
2.3.4.270 134,446 8/29/2017
2.3.4.267 65,519 8/16/2017
2.3.4.247 392,087 5/16/2017
2.3.4.231 204,801 4/12/2017
2.3.4.224 245,342 3/29/2017
2.3.4.221-pre6 7,348 3/27/2017
2.3.4.214-pre5 10,239 3/14/2017
2.3.4.212-pre4 6,189 3/10/2017
2.3.4.211-pre3 4,034 3/9/2017
2.3.4.192-pre2 19,245 2/3/2017
2.3.4.184-pre1 12,707 1/13/2017
2.3.3.193 239,894 2/1/2017
2.3.3.180 206,900 1/5/2017
2.3.3.175 117,172 12/6/2016
2.3.3.168 65,853 11/23/2016
2.3.3.166-pre4 7,883 11/3/2016
2.3.3.163-pre3 6,382 10/17/2016
2.3.3.152-pre2 15,814 9/15/2016
2.3.2.127 264,646 9/14/2016
2.3.2.118-pre1 6,799 8/3/2016
2.3.1.114 154,807 8/3/2016
2.3.1.113-pre3 3,814 7/19/2016
2.3.1.111-pre2 4,765 7/4/2016
2.3.1.110-pre1 2,455 6/29/2016
2.3.0.107 197,116 6/29/2016
2.3.0.49 86,033 6/16/2016
2.3.0.46-pre3 15,957 5/30/2016
2.3.0.38-pre2 13,078 4/27/2016
2.3.0.34-pre1 8,693 4/27/2016
2.2.0.45 121,097 5/30/2016
2.2.0.31 126,919 4/27/2016
2.2.0.23-pre4 3,094 4/20/2016
2.2.0.18-pre3 2,304 4/20/2016
2.2.0.5-pre2 15,978 4/8/2016
2.2.0.4-pre1 18,520 4/5/2016
2.1.0.6529 97,642 3/13/2016
2.1.0.6526 17,438 3/9/2016
2.1.0.6524 36,019 3/2/2016
2.1.0.6521 12,009 3/1/2016
2.1.0.6517-pre5 2,147 2/18/2016
2.1.0.6513-pre4 2,129 2/9/2016
2.1.0.6508-pre3 2,454 1/28/2016
2.1.0.6503-pre2 7,035 1/22/2016
2.1.0.6501-pre1 1,595 1/21/2016
2.1.0.6500-pre1 1,419 1/20/2016
2.0.1.6505 92,544 1/28/2016
2.0.1.6495 74,764 1/20/2016
2.0.1.6492-pre1 3,881 12/3/2015
2.0.0.6490 96,508 12/1/2015
2.0.0.6484 17,792 11/21/2015
2.0.0.6482 236,944 11/17/2015
1.5.2.6478-pre3 1,308 11/17/2015
1.5.2.6477-pre2 3,904 11/10/2015
1.5.2.6469-pre1 2,209 10/20/2015
1.5.1.6471 76,024 10/20/2015
1.5.1.6468 3,928 10/20/2015
1.5.1.6460-pre2 1,684 10/13/2015
1.5.1.6455-pre1 3,037 10/2/2015
1.5.0.6447 53,925 9/25/2015
1.5.0.6446 21,545 9/16/2015
1.5.0.6404-pre3 3,331 8/25/2015
1.5.0.6401-pre2 1,537 8/21/2015
1.5.0.6396-pre1 1,992 8/5/2015
1.4.4.6449 2,735 9/25/2015
1.4.4.6443 1,681 9/16/2015
1.4.4.6392 76,475 7/29/2015
1.4.4.6391 2,044 7/28/2015
1.4.4.6387 2,984 7/27/2015
1.4.4.6379-pre3 1,566 7/20/2015
1.4.4.6378-pre2 1,393 7/16/2015
1.4.4.6377-pre1 1,388 7/14/2015
1.4.3.6376 41,585 7/9/2015
1.4.3.6374 16,593 7/1/2015
1.4.3.6372 2,103 6/30/2015
1.4.3.6364-pre3 2,359 6/16/2015
1.4.3.6358-pre2 5,788 4/24/2015
1.4.3.6356-pre1 1,490 4/21/2015
1.4.2.6359 61,411 4/30/2015
1.4.2.6355 14,307 4/21/2015
1.4.2.6353-pre2 2,534 3/31/2015
1.4.2.6350-pre1 1,595 3/30/2015
1.4.1.6349 44,332 3/30/2015
1.4.1.6347-pre2 3,273 3/19/2015
1.4.1.6342-pre1 1,736 3/10/2015
1.4.0.6341 28,780 3/9/2015
1.4.0.6340-pre2 2,562 3/6/2015
1.4.0.6336-pre1 1,559 3/3/2015
1.3.5.6337 5,140 3/5/2015
1.3.5.6335 24,718 3/2/2015
1.3.5.6333-pre1 2,124 2/17/2015
1.3.4.6332 18,948 2/17/2015
1.3.4.6331-pre4 1,583 2/13/2015
1.3.4.6329-pre3 1,318 2/12/2015
1.3.4.6328-pre2 1,321 2/11/2015
1.3.4.6325-pre1 1,288 2/9/2015
1.3.3.6323 52,522 2/9/2015
1.3.3.6322-pre3 1,282 2/6/2015
1.3.3.6321-pre2 1,445 2/4/2015
1.3.3.6318-pre1 1,450 2/2/2015
1.3.2.6316 7,748 2/3/2015
1.3.2.6313-pre3 1,429 1/30/2015
1.3.2.6309-pre2 1,474 1/28/2015
1.3.2.6299-pre1 2,188 1/20/2015
1.3.1.6296 55,279 1/4/2015
1.3.1.6294-pre1 4,478 12/24/2014
1.3.0.6292 9,619 12/24/2014
1.3.0.6286-pre4 2,188 12/19/2014
1.3.0.6284-pre3 1,690 12/12/2014
1.3.0.6280-pre2 1,641 12/9/2014
1.3.0.6275-pre1 7,919 11/12/2014
1.2.3.6257 38,826 10/2/2014
1.2.3.6256-pre4 2,330 9/26/2014
1.2.3.6255-pre3 2,733 9/20/2014
1.2.3.6249-pre2 1,904 9/9/2014
1.2.3.6246-pre1 4,446 8/15/2014
1.2.2.6243 28,601 7/30/2014
1.2.2.6241-pre3 2,838 7/28/2014
1.2.2.6240-pre2 4,677 7/22/2014
1.2.2.6238-pre1 3,810 7/17/2014
1.2.1.6229 8,543 7/14/2014
1.1.1.6206 14,258 6/19/2014
1.1.0.6201 13,518 6/12/2014
1.0.6197 4,249 6/4/2014
1.0.6188 11,752 5/28/2014
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