Xamarin.Forms 2.1.0.6500-pre1

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

This is a prerelease version of Xamarin.Forms.
There is a newer version of this package available.
See the version list below for details.
Install-Package Xamarin.Forms -Version 2.1.0.6500-pre1
dotnet add package Xamarin.Forms --version 2.1.0.6500-pre1
<PackageReference Include="Xamarin.Forms" Version="2.1.0.6500-pre1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Xamarin.Forms --version 2.1.0.6500-pre1
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 ###

IDataTempalteSelectors 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
4.0.0.394984-pre10 5,516 5/3/2019
4.0.0.346134-pre9 6,436 4/18/2019
4.0.0.304370-pre8 7,187 4/3/2019
4.0.0.250467-pre7 4,704 3/20/2019
4.0.0.232914-pre6 5,717 3/14/2019
4.0.0.169046-pre5 5,207 2/21/2019
4.0.0.135214-pre4 3,924 2/6/2019
4.0.0.94569-pre3 3,843 1/24/2019
4.0.0.62955-pre2 11,555 1/10/2019
4.0.0.8055-pre1 11,960 12/4/2018
3.6.0.344457 61,910 4/18/2019
3.6.0.293080 47,232 4/3/2019
3.6.0.264807 76,132 3/19/2019
3.6.0.220655 63,045 3/6/2019
3.6.0.169048-pre2 444 2/21/2019
3.6.0.135200-pre1 3,699 2/6/2019
3.5.0.274416 3,684 3/26/2019
3.5.0.169047 54,349 2/20/2019
3.5.0.129452 69,565 2/6/2019
3.5.0.94564-pre3 987 1/24/2019
3.5.0.62956-pre2 844 1/10/2019
3.4.0.1039999 3,068 3/26/2019
3.4.0.1029999 65,737 1/24/2019
3.4.0.1009999 78,288 1/4/2019
3.4.0.1008975 332,614 11/15/2018
3.4.0.987044-pre2 2,207 11/8/2018
3.4.0.925479-pre1 8,714 10/18/2018
3.3.0.967583 142,401 11/1/2018
3.3.0.912540 98,366 10/18/2018
3.3.0.893527-pre3 5,928 10/11/2018
3.3.0.871608-pre2 9,128 10/1/2018
3.3.0.840541-pre1 4,533 9/20/2018
3.2.0.871581 85,791 10/3/2018
3.2.0.839982 110,015 9/17/2018
3.2.0.809874-pre3 3,431 9/10/2018
3.2.0.729530-pre2 10,627 8/14/2018
3.2.0.637442-pre1 8,664 7/17/2018
3.1.0.697729 299,009 8/1/2018
3.1.0.637273 92,964 7/11/2018
3.1.0.583944 125,430 6/20/2018
3.1.0.561732-pre4 5,886 6/11/2018
3.1.0.550168-pre3 2,885 6/6/2018
3.1.0.530888-pre2 1,753 6/4/2018
3.1.0.469394-pre1 11,004 5/9/2018
3.0.0.561731 137,476 6/11/2018
3.0.0.550146 25,616 6/6/2018
3.0.0.530893 19,822 6/4/2018
3.0.0.482510 212,187 5/14/2018
3.0.0.446417 117,010 5/1/2018
3.0.0.427558-pre4 8,686 4/25/2018
3.0.0.354232-pre3 13,461 4/5/2018
3.0.0.296286-pre2 8,110 3/20/2018
2.5.1.527436 79,286 5/4/2018
2.5.1.444934 154,880 4/4/2018
2.5.1.392594-pre3 4,125 3/21/2018
2.5.1.340284-pre2 5,902 3/9/2018
2.5.1.317207-pre1 5,598 3/1/2018
2.5.0.280555 305,403 2/16/2018
2.5.0.122203 310,157 12/18/2017
2.5.0.121934 199,654 11/28/2017
2.5.0.91635 127,774 11/16/2017
2.5.0.77107 28,350 11/13/2017
2.5.0.75255-pre3 5,368 11/10/2017
2.5.0.19271-pre2 9,149 10/20/2017
2.4.0.91020 44,457 11/16/2017
2.4.0.74863 34,041 11/10/2017
2.4.0.38779 58,883 10/30/2017
2.4.0.18342 54,528 10/20/2017
2.4.0.282 157,107 9/29/2017
2.4.0.280 187,487 9/27/2017
2.4.0.275-pre3 8,019 9/19/2017
2.4.0.269-pre2 13,535 8/29/2017
2.4.0.266-pre1 19,076 8/16/2017
2.3.5.256-pre6 34,752 6/29/2017
2.3.5.255-pre5 4,816 6/26/2017
2.3.5.239-pre3 27,645 5/11/2017
2.3.5.235-pre2 11,193 4/26/2017
2.3.5.233-pre1 9,041 4/13/2017
2.3.4.270 133,799 8/29/2017
2.3.4.267 65,335 8/16/2017
2.3.4.247 390,240 5/16/2017
2.3.4.231 204,467 4/12/2017
2.3.4.224 244,905 3/29/2017
2.3.4.221-pre6 7,336 3/27/2017
2.3.4.214-pre5 10,228 3/14/2017
2.3.4.212-pre4 6,178 3/10/2017
2.3.4.211-pre3 4,020 3/9/2017
2.3.4.192-pre2 19,226 2/3/2017
2.3.4.184-pre1 12,675 1/13/2017
2.3.3.193 239,423 2/1/2017
2.3.3.180 206,710 1/5/2017
2.3.3.175 117,088 12/6/2016
2.3.3.168 65,783 11/23/2016
2.3.3.166-pre4 7,852 11/3/2016
2.3.3.163-pre3 6,379 10/17/2016
2.3.3.152-pre2 15,791 9/15/2016
2.3.2.127 263,622 9/14/2016
2.3.2.118-pre1 6,795 8/3/2016
2.3.1.114 154,699 8/3/2016
2.3.1.113-pre3 3,812 7/19/2016
2.3.1.111-pre2 4,760 7/4/2016
2.3.1.110-pre1 2,452 6/29/2016
2.3.0.107 196,522 6/29/2016
2.3.0.49 85,870 6/16/2016
2.3.0.46-pre3 15,941 5/30/2016
2.3.0.38-pre2 13,068 4/27/2016
2.3.0.34-pre1 8,688 4/27/2016
2.2.0.45 120,003 5/30/2016
2.2.0.31 126,820 4/27/2016
2.2.0.23-pre4 3,088 4/20/2016
2.2.0.18-pre3 2,301 4/20/2016
2.2.0.5-pre2 15,977 4/8/2016
2.2.0.4-pre1 18,515 4/5/2016
2.1.0.6529 97,550 3/13/2016
2.1.0.6526 17,427 3/9/2016
2.1.0.6524 35,977 3/2/2016
2.1.0.6521 11,994 3/1/2016
2.1.0.6517-pre5 2,139 2/18/2016
2.1.0.6513-pre4 2,118 2/9/2016
2.1.0.6508-pre3 2,442 1/28/2016
2.1.0.6503-pre2 7,028 1/22/2016
2.1.0.6501-pre1 1,585 1/21/2016
2.1.0.6500-pre1 1,408 1/20/2016
2.0.1.6505 92,498 1/28/2016
2.0.1.6495 74,738 1/20/2016
2.0.1.6492-pre1 3,872 12/3/2015
2.0.0.6490 96,413 12/1/2015
2.0.0.6484 17,772 11/21/2015
2.0.0.6482 236,669 11/17/2015
1.5.2.6478-pre3 1,295 11/17/2015
1.5.2.6477-pre2 3,892 11/10/2015
1.5.2.6469-pre1 2,201 10/20/2015
1.5.1.6471 75,953 10/20/2015
1.5.1.6468 3,918 10/20/2015
1.5.1.6460-pre2 1,673 10/13/2015
1.5.1.6455-pre1 3,028 10/2/2015
1.5.0.6447 53,786 9/25/2015
1.5.0.6446 21,528 9/16/2015
1.5.0.6404-pre3 3,321 8/25/2015
1.5.0.6401-pre2 1,528 8/21/2015
1.5.0.6396-pre1 1,983 8/5/2015
1.4.4.6449 2,721 9/25/2015
1.4.4.6443 1,673 9/16/2015
1.4.4.6392 76,413 7/29/2015
1.4.4.6391 2,034 7/28/2015
1.4.4.6387 2,970 7/27/2015
1.4.4.6379-pre3 1,556 7/20/2015
1.4.4.6378-pre2 1,383 7/16/2015
1.4.4.6377-pre1 1,377 7/14/2015
1.4.3.6376 41,511 7/9/2015
1.4.3.6374 16,578 7/1/2015
1.4.3.6372 2,091 6/30/2015
1.4.3.6364-pre3 2,346 6/16/2015
1.4.3.6358-pre2 5,777 4/24/2015
1.4.3.6356-pre1 1,482 4/21/2015
1.4.2.6359 61,300 4/30/2015
1.4.2.6355 14,281 4/21/2015
1.4.2.6353-pre2 2,524 3/31/2015
1.4.2.6350-pre1 1,584 3/30/2015
1.4.1.6349 44,308 3/30/2015
1.4.1.6347-pre2 3,263 3/19/2015
1.4.1.6342-pre1 1,726 3/10/2015
1.4.0.6341 28,752 3/9/2015
1.4.0.6340-pre2 2,550 3/6/2015
1.4.0.6336-pre1 1,549 3/3/2015
1.3.5.6337 5,130 3/5/2015
1.3.5.6335 24,675 3/2/2015
1.3.5.6333-pre1 2,113 2/17/2015
1.3.4.6332 18,906 2/17/2015
1.3.4.6331-pre4 1,573 2/13/2015
1.3.4.6329-pre3 1,309 2/12/2015
1.3.4.6328-pre2 1,312 2/11/2015
1.3.4.6325-pre1 1,277 2/9/2015
1.3.3.6323 52,482 2/9/2015
1.3.3.6322-pre3 1,274 2/6/2015
1.3.3.6321-pre2 1,434 2/4/2015
1.3.3.6318-pre1 1,441 2/2/2015
1.3.2.6316 7,738 2/3/2015
1.3.2.6313-pre3 1,418 1/30/2015
1.3.2.6309-pre2 1,463 1/28/2015
1.3.2.6299-pre1 2,178 1/20/2015
1.3.1.6296 55,206 1/4/2015
1.3.1.6294-pre1 4,469 12/24/2014
1.3.0.6292 9,605 12/24/2014
1.3.0.6286-pre4 2,179 12/19/2014
1.3.0.6284-pre3 1,676 12/12/2014
1.3.0.6280-pre2 1,631 12/9/2014
1.3.0.6275-pre1 7,906 11/12/2014
1.2.3.6257 38,796 10/2/2014
1.2.3.6256-pre4 2,319 9/26/2014
1.2.3.6255-pre3 2,722 9/20/2014
1.2.3.6249-pre2 1,893 9/9/2014
1.2.3.6246-pre1 4,438 8/15/2014
1.2.2.6243 28,578 7/30/2014
1.2.2.6241-pre3 2,829 7/28/2014
1.2.2.6240-pre2 4,667 7/22/2014
1.2.2.6238-pre1 3,801 7/17/2014
1.2.1.6229 8,533 7/14/2014
1.1.1.6206 14,248 6/19/2014
1.1.0.6201 13,503 6/12/2014
1.0.6197 4,240 6/4/2014
1.0.6188 11,736 5/28/2014
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