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 prerelease 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
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
2.5.0.121934 30,059 11/28/2017
2.5.0.91635 47,154 11/16/2017
2.5.0.77107 8,998 11/13/2017
2.5.0.75255-pre3 1,731 11/10/2017
2.5.0.19271-pre2 4,651 10/20/2017
2.4.0.91020 5,042 11/16/2017
2.4.0.74863 17,385 11/10/2017
2.4.0.38779 34,571 10/30/2017
2.4.0.18342 31,490 10/20/2017
2.4.0.282 84,424 9/29/2017
2.4.0.280 57,790 9/27/2017
2.4.0.275-pre3 4,184 9/19/2017
2.4.0.269-pre2 9,202 8/29/2017
2.4.0.266-pre1 7,521 8/16/2017
2.3.5.256-pre6 21,585 6/29/2017
2.3.5.255-pre5 1,832 6/26/2017
2.3.5.239-pre3 20,652 5/11/2017
2.3.5.235-pre2 7,621 4/26/2017
2.3.5.233-pre1 5,409 4/13/2017
2.3.4.270 73,094 8/29/2017
2.3.4.267 44,383 8/16/2017
2.3.4.247 269,749 5/16/2017
2.3.4.231 153,947 4/12/2017
2.3.4.224 197,904 3/29/2017
2.3.4.221-pre6 4,461 3/27/2017
2.3.4.214-pre5 7,272 3/14/2017
2.3.4.212-pre4 3,315 3/10/2017
2.3.4.211-pre3 1,137 3/9/2017
2.3.4.192-pre2 14,880 2/3/2017
2.3.4.184-pre1 7,920 1/13/2017
2.3.3.193 180,788 2/1/2017
2.3.3.180 176,455 1/5/2017
2.3.3.175 105,903 12/6/2016
2.3.3.168 57,451 11/23/2016
2.3.3.166-pre4 5,897 11/3/2016
2.3.3.163-pre3 5,312 10/17/2016
2.3.3.152-pre2 12,358 9/15/2016
2.3.2.127 223,103 9/14/2016
2.3.2.118-pre1 5,901 8/3/2016
2.3.1.114 137,066 8/3/2016
2.3.1.113-pre3 2,795 7/19/2016
2.3.1.111-pre2 3,887 7/4/2016
2.3.1.110-pre1 1,560 6/29/2016
2.3.0.107 173,728 6/29/2016
2.3.0.49 65,525 6/16/2016
2.3.0.46-pre3 12,615 5/30/2016
2.3.0.38-pre2 11,027 4/27/2016
2.3.0.34-pre1 7,152 4/27/2016
2.2.0.45 96,364 5/30/2016
2.2.0.31 114,515 4/27/2016
2.2.0.23-pre4 2,246 4/20/2016
2.2.0.18-pre3 1,428 4/20/2016
2.2.0.5-pre2 15,084 4/8/2016
2.2.0.4-pre1 17,597 4/5/2016
2.1.0.6529 86,434 3/13/2016
2.1.0.6526 15,352 3/9/2016
2.1.0.6524 24,873 3/2/2016
2.1.0.6521 9,126 3/1/2016
2.1.0.6517-pre5 1,170 2/18/2016
2.1.0.6513-pre4 1,116 2/9/2016
2.1.0.6508-pre3 1,409 1/28/2016
2.1.0.6503-pre2 5,992 1/22/2016
2.1.0.6501-pre1 561 1/21/2016
2.1.0.6500-pre1 (current version) 402 1/20/2016
2.0.1.6505 83,590 1/28/2016
2.0.1.6495 67,473 1/20/2016
2.0.1.6492-pre1 2,884 12/3/2015
2.0.0.6490 84,399 12/1/2015
2.0.0.6484 16,226 11/21/2015
2.0.0.6482 208,312 11/17/2015
1.5.2.6478-pre3 359 11/17/2015
1.5.2.6477-pre2 2,618 11/10/2015
1.5.2.6469-pre1 1,142 10/20/2015
1.5.1.6471 68,624 10/20/2015
1.5.1.6468 2,734 10/20/2015
1.5.1.6460-pre2 619 10/13/2015
1.5.1.6455-pre1 1,763 10/2/2015
1.5.0.6447 42,327 9/25/2015
1.5.0.6446 18,903 9/16/2015
1.5.0.6404-pre3 2,264 8/25/2015
1.5.0.6401-pre2 451 8/21/2015
1.5.0.6396-pre1 1,042 8/5/2015
1.4.4.6449 1,521 9/25/2015
1.4.4.6443 644 9/16/2015
1.4.4.6392 63,191 7/29/2015
1.4.4.6391 1,092 7/28/2015
1.4.4.6387 2,004 7/27/2015
1.4.4.6379-pre3 616 7/20/2015
1.4.4.6378-pre2 455 7/16/2015
1.4.4.6377-pre1 417 7/14/2015
1.4.3.6376 32,598 7/9/2015
1.4.3.6374 14,290 7/1/2015
1.4.3.6372 1,143 6/30/2015
1.4.3.6364-pre3 1,350 6/16/2015
1.4.3.6358-pre2 4,601 4/24/2015
1.4.3.6356-pre1 499 4/21/2015
1.4.2.6359 48,881 4/30/2015
1.4.2.6355 11,860 4/21/2015
1.4.2.6353-pre2 1,536 3/31/2015
1.4.2.6350-pre1 625 3/30/2015
1.4.1.6349 39,461 3/30/2015
1.4.1.6347-pre2 2,342 3/19/2015
1.4.1.6342-pre1 786 3/10/2015
1.4.0.6341 26,052 3/9/2015
1.4.0.6340-pre2 1,323 3/6/2015
1.4.0.6336-pre1 665 3/3/2015
1.3.5.6337 4,101 3/5/2015
1.3.5.6335 18,257 3/2/2015
1.3.5.6333-pre1 1,033 2/17/2015
1.3.4.6332 15,300 2/17/2015
1.3.4.6331-pre4 602 2/13/2015
1.3.4.6329-pre3 386 2/12/2015
1.3.4.6328-pre2 424 2/11/2015
1.3.4.6325-pre1 396 2/9/2015
1.3.3.6323 44,322 2/9/2015
1.3.3.6322-pre3 357 2/6/2015
1.3.3.6321-pre2 521 2/4/2015
1.3.3.6318-pre1 480 2/2/2015
1.3.2.6316 6,304 2/3/2015
1.3.2.6313-pre3 454 1/30/2015
1.3.2.6309-pre2 511 1/28/2015
1.3.2.6299-pre1 1,221 1/20/2015
1.3.1.6296 46,785 1/4/2015
1.3.1.6294-pre1 3,316 12/24/2014
1.3.0.6292 8,155 12/24/2014
1.3.0.6286-pre4 1,260 12/19/2014
1.3.0.6284-pre3 790 12/12/2014
1.3.0.6280-pre2 697 12/9/2014
1.3.0.6275-pre1 6,939 11/12/2014
1.2.3.6257 34,564 10/2/2014
1.2.3.6256-pre4 1,387 9/26/2014
1.2.3.6255-pre3 1,751 9/20/2014
1.2.3.6249-pre2 986 9/9/2014
1.2.3.6246-pre1 3,317 8/15/2014
1.2.2.6243 25,227 7/30/2014
1.2.2.6241-pre3 1,877 7/28/2014
1.2.2.6240-pre2 3,656 7/22/2014
1.2.2.6238-pre1 2,687 7/17/2014
1.2.1.6229 6,977 7/14/2014
1.1.1.6206 13,217 6/19/2014
1.1.0.6201 11,310 6/12/2014
1.0.6197 3,070 6/4/2014
1.0.6188 10,109 5/28/2014
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