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There is a newer version of this package available.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
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
4.0.0.8055-pre1 2,955 12/4/2018
3.4.0.1008975 76,979 11/15/2018
3.4.0.987044-pre2 1,785 11/8/2018
3.4.0.925479-pre1 5,927 10/18/2018
3.3.0.967583 74,328 11/1/2018
3.3.0.912540 66,268 10/18/2018
3.3.0.893527-pre3 3,540 10/11/2018
3.3.0.871608-pre2 6,067 10/1/2018
3.3.0.840541-pre1 2,955 9/20/2018
3.2.0.871581 60,535 10/3/2018
3.2.0.839982 72,562 9/17/2018
3.2.0.809874-pre3 2,739 9/10/2018
3.2.0.729530-pre2 7,538 8/14/2018
3.2.0.637442-pre1 6,740 7/17/2018
3.1.0.697729 247,574 8/1/2018
3.1.0.637273 74,841 7/11/2018
3.1.0.583944 110,990 6/20/2018
3.1.0.561732-pre4 5,149 6/11/2018
3.1.0.550168-pre3 2,370 6/6/2018
3.1.0.530888-pre2 1,333 6/4/2018
3.1.0.469394-pre1 10,155 5/9/2018
3.0.0.561731 123,009 6/11/2018
3.0.0.550146 22,913 6/6/2018
3.0.0.530893 17,011 6/4/2018
3.0.0.482510 178,827 5/14/2018
3.0.0.446417 99,026 5/1/2018
3.0.0.427558-pre4 7,741 4/25/2018
3.0.0.354232-pre3 12,275 4/5/2018
3.0.0.296286-pre2 7,482 3/20/2018
2.5.1.527436 58,565 5/4/2018
2.5.1.444934 131,273 4/4/2018
2.5.1.392594-pre3 3,708 3/21/2018
2.5.1.340284-pre2 5,372 3/9/2018
2.5.1.317207-pre1 5,159 3/1/2018
2.5.0.280555 276,187 2/16/2018
2.5.0.122203 279,129 12/18/2017
2.5.0.121934 177,254 11/28/2017
2.5.0.91635 118,818 11/16/2017
2.5.0.77107 25,940 11/13/2017
2.5.0.75255-pre3 4,915 11/10/2017
2.5.0.19271-pre2 8,377 10/20/2017
2.4.0.91020 39,292 11/16/2017
2.4.0.74863 32,426 11/10/2017
2.4.0.38779 56,230 10/30/2017
2.4.0.18342 51,607 10/20/2017
2.4.0.282 149,519 9/29/2017
2.4.0.280 163,457 9/27/2017
2.4.0.275-pre3 7,558 9/19/2017
2.4.0.269-pre2 12,878 8/29/2017
2.4.0.266-pre1 17,643 8/16/2017
2.3.5.256-pre6 32,485 6/29/2017
2.3.5.255-pre5 4,419 6/26/2017
2.3.5.239-pre3 26,718 5/11/2017
2.3.5.235-pre2 10,700 4/26/2017
2.3.5.233-pre1 8,526 4/13/2017
2.3.4.270 123,232 8/29/2017
2.3.4.267 60,935 8/16/2017
2.3.4.247 370,339 5/16/2017
2.3.4.231 196,678 4/12/2017
2.3.4.224 235,933 3/29/2017
2.3.4.221-pre6 6,878 3/27/2017
2.3.4.214-pre5 9,728 3/14/2017
2.3.4.212-pre4 5,771 3/10/2017
2.3.4.211-pre3 3,607 3/9/2017
2.3.4.192-pre2 18,589 2/3/2017
2.3.4.184-pre1 11,824 1/13/2017
2.3.3.193 226,699 2/1/2017
2.3.3.180 201,394 1/5/2017
2.3.3.175 114,965 12/6/2016
2.3.3.168 63,899 11/23/2016
2.3.3.166-pre4 7,238 11/3/2016
2.3.3.163-pre3 6,064 10/17/2016
2.3.3.152-pre2 15,029 9/15/2016
2.3.2.127 257,084 9/14/2016
2.3.2.118-pre1 6,512 8/3/2016
2.3.1.114 151,916 8/3/2016
2.3.1.113-pre3 3,526 7/19/2016
2.3.1.111-pre2 4,490 7/4/2016
2.3.1.110-pre1 2,164 6/29/2016
2.3.0.107 193,526 6/29/2016
2.3.0.49 81,708 6/16/2016
2.3.0.46-pre3 15,265 5/30/2016
2.3.0.38-pre2 12,526 4/27/2016
2.3.0.34-pre1 8,252 4/27/2016
2.2.0.45 114,698 5/30/2016
2.2.0.31 124,669 4/27/2016
2.2.0.23-pre4 2,822 4/20/2016
2.2.0.18-pre3 2,017 4/20/2016
2.2.0.5-pre2 15,670 4/8/2016
2.2.0.4-pre1 18,203 4/5/2016
2.1.0.6529 95,125 3/13/2016
2.1.0.6526 16,796 3/9/2016
2.1.0.6524 29,776 3/2/2016
2.1.0.6521 11,351 3/1/2016
2.1.0.6517-pre5 1,711 2/18/2016
2.1.0.6513-pre4 1,698 2/9/2016
2.1.0.6508-pre3 2,000 1/28/2016
2.1.0.6503-pre2 6,592 1/22/2016
2.1.0.6501-pre1 1,130 1/21/2016
2.1.0.6500-pre1 982 1/20/2016
2.0.1.6505 90,808 1/28/2016
2.0.1.6495 73,592 1/20/2016
2.0.1.6492-pre1 3,414 12/3/2015
2.0.0.6490 94,283 12/1/2015
2.0.0.6484 17,271 11/21/2015
2.0.0.6482 230,804 11/17/2015
1.5.2.6478-pre3 837 11/17/2015
1.5.2.6477-pre2 3,412 11/10/2015
1.5.2.6469-pre1 1,760 10/20/2015
1.5.1.6471 74,193 10/20/2015
1.5.1.6468 3,440 10/20/2015
1.5.1.6460-pre2 1,216 10/13/2015
1.5.1.6455-pre1 2,528 10/2/2015
1.5.0.6447 50,483 9/25/2015
1.5.0.6446 20,788 9/16/2015
1.5.0.6404-pre3 2,891 8/25/2015
1.5.0.6401-pre2 1,035 8/21/2015
1.5.0.6396-pre1 1,559 8/5/2015
1.4.4.6449 2,272 9/25/2015
1.4.4.6443 1,244 9/16/2015
1.4.4.6392 74,418 7/29/2015
1.4.4.6391 1,618 7/28/2015
1.4.4.6387 2,517 7/27/2015
1.4.4.6379-pre3 1,115 7/20/2015
1.4.4.6378-pre2 949 7/16/2015
1.4.4.6377-pre1 932 7/14/2015
1.4.3.6376 39,778 7/9/2015
1.4.3.6374 15,992 7/1/2015
1.4.3.6372 1,667 6/30/2015
1.4.3.6364-pre3 1,895 6/16/2015
1.4.3.6358-pre2 5,323 4/24/2015
1.4.3.6356-pre1 996 4/21/2015
1.4.2.6359 58,816 4/30/2015
1.4.2.6355 13,647 4/21/2015
1.4.2.6353-pre2 2,087 3/31/2015
1.4.2.6350-pre1 1,178 3/30/2015
1.4.1.6349 43,491 3/30/2015
1.4.1.6347-pre2 2,854 3/19/2015
1.4.1.6342-pre1 1,272 3/10/2015
1.4.0.6341 27,965 3/9/2015
1.4.0.6340-pre2 2,062 3/6/2015
1.4.0.6336-pre1 1,150 3/3/2015
1.3.5.6337 4,703 3/5/2015
1.3.5.6335 22,705 3/2/2015
1.3.5.6333-pre1 1,541 2/17/2015
1.3.4.6332 17,651 2/17/2015
1.3.4.6331-pre4 1,085 2/13/2015
1.3.4.6329-pre3 877 2/12/2015
1.3.4.6328-pre2 898 2/11/2015
1.3.4.6325-pre1 877 2/9/2015
1.3.3.6323 50,922 2/9/2015
1.3.3.6322-pre3 831 2/6/2015
1.3.3.6321-pre2 1,006 2/4/2015
1.3.3.6318-pre1 966 2/2/2015
1.3.2.6316 7,181 2/3/2015
1.3.2.6313-pre3 938 1/30/2015
1.3.2.6309-pre2 992 1/28/2015
1.3.2.6299-pre1 1,707 1/20/2015
1.3.1.6296 53,134 1/4/2015
1.3.1.6294-pre1 3,986 12/24/2014
1.3.0.6292 9,033 12/24/2014
1.3.0.6286-pre4 1,762 12/19/2014
1.3.0.6284-pre3 1,271 12/12/2014
1.3.0.6280-pre2 1,183 12/9/2014
1.3.0.6275-pre1 7,450 11/12/2014
1.2.3.6257 37,567 10/2/2014
1.2.3.6256-pre4 1,887 9/26/2014
1.2.3.6255-pre3 2,273 9/20/2014
1.2.3.6249-pre2 1,466 9/9/2014
1.2.3.6246-pre1 3,980 8/15/2014
1.2.2.6243 27,715 7/30/2014
1.2.2.6241-pre3 2,402 7/28/2014
1.2.2.6240-pre2 4,232 7/22/2014
1.2.2.6238-pre1 3,338 7/17/2014
1.2.1.6229 7,964 7/14/2014
1.1.1.6206 13,809 6/19/2014
1.1.0.6201 12,802 6/12/2014
1.0.6197 3,789 6/4/2014
1.0.6188 11,179 5/28/2014
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