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
3.0.0.354232... 3,559 4/5/2018
3.0.0.296286... 4,395 3/20/2018
2.5.1.444934 40,147 4/4/2018
2.5.1.392594... 721 3/21/2018
2.5.1.340284... 2,643 3/9/2018
2.5.1.317207... 2,201 3/1/2018
2.5.0.280555 165,815 2/16/2018
2.5.0.122203 181,055 12/18/2017
2.5.0.121934 126,227 11/28/2017
2.5.0.91635 82,970 11/16/2017
2.5.0.77107 16,671 11/13/2017
2.5.0.75255-... 2,055 11/10/2017
2.5.0.19271-... 5,324 10/20/2017
2.4.0.91020 21,324 11/16/2017
2.4.0.74863 25,366 11/10/2017
2.4.0.38779 47,412 10/30/2017
2.4.0.18342 41,774 10/20/2017
2.4.0.282 125,741 9/29/2017
2.4.0.280 105,530 9/27/2017
2.4.0.275-pre3 4,696 9/19/2017
2.4.0.269-pre2 10,013 8/29/2017
2.4.0.266-pre1 11,831 8/16/2017
2.3.5.256-pre6 25,795 6/29/2017
2.3.5.255-pre5 1,965 6/26/2017
2.3.5.239-pre3 22,508 5/11/2017
2.3.5.235-pre2 7,975 4/26/2017
2.3.5.233-pre1 5,877 4/13/2017
2.3.4.270 97,980 8/29/2017
2.3.4.267 51,219 8/16/2017
2.3.4.247 321,570 5/16/2017
2.3.4.231 175,002 4/12/2017
2.3.4.224 215,988 3/29/2017
2.3.4.221-pre6 4,658 3/27/2017
2.3.4.214-pre5 7,579 3/14/2017
2.3.4.212-pre4 3,510 3/10/2017
2.3.4.211-pre3 1,210 3/9/2017
2.3.4.192-pre2 15,675 2/3/2017
2.3.4.184-pre1 8,669 1/13/2017
2.3.3.193 200,715 2/1/2017
2.3.3.180 189,564 1/5/2017
2.3.3.175 110,132 12/6/2016
2.3.3.168 60,544 11/23/2016
2.3.3.166-pre4 6,336 11/3/2016
2.3.3.163-pre3 5,528 10/17/2016
2.3.3.152-pre2 13,375 9/15/2016
2.3.2.127 241,965 9/14/2016
2.3.2.118-pre1 6,042 8/3/2016
2.3.1.114 144,405 8/3/2016
2.3.1.113-pre3 3,016 7/19/2016
2.3.1.111-pre2 4,006 7/4/2016
2.3.1.110-pre1 1,680 6/29/2016
2.3.0.107 186,257 6/29/2016
2.3.0.49 71,163 6/16/2016
2.3.0.46-pre3 13,802 5/30/2016
2.3.0.38-pre2 11,507 4/27/2016
2.3.0.34-pre1 7,495 4/27/2016
2.2.0.45 104,511 5/30/2016
2.2.0.31 119,308 4/27/2016
2.2.0.23-pre4 2,367 4/20/2016
2.2.0.18-pre3 1,581 4/20/2016
2.2.0.5-pre2 15,208 4/8/2016
2.2.0.4-pre1 17,733 4/5/2016
2.1.0.6529 90,394 3/13/2016
2.1.0.6526 15,975 3/9/2016
2.1.0.6524 25,690 3/2/2016
2.1.0.6521 10,224 3/1/2016
2.1.0.6517-pre5 1,268 2/18/2016
2.1.0.6513-pre4 1,252 2/9/2016
2.1.0.6508-pre3 1,545 1/28/2016
2.1.0.6503-pre2 6,140 1/22/2016
2.1.0.6501-pre1 693 1/21/2016
2.1.0.6500-pre1 (current version) 534 1/20/2016
2.0.1.6505 87,113 1/28/2016
2.0.1.6495 70,844 1/20/2016
2.0.1.6492-pre1 2,974 12/3/2015
2.0.0.6490 89,164 12/1/2015
2.0.0.6484 16,585 11/21/2015
2.0.0.6482 218,648 11/17/2015
1.5.2.6478-pre3 416 11/17/2015
1.5.2.6477-pre2 2,879 11/10/2015
1.5.2.6469-pre1 1,287 10/20/2015
1.5.1.6471 71,010 10/20/2015
1.5.1.6468 2,922 10/20/2015
1.5.1.6460-pre2 771 10/13/2015
1.5.1.6455-pre1 2,027 10/2/2015
1.5.0.6447 45,677 9/25/2015
1.5.0.6446 19,685 9/16/2015
1.5.0.6404-pre3 2,426 8/25/2015
1.5.0.6401-pre2 595 8/21/2015
1.5.0.6396-pre1 1,120 8/5/2015
1.4.4.6449 1,748 9/25/2015
1.4.4.6443 795 9/16/2015
1.4.4.6392 70,348 7/29/2015
1.4.4.6391 1,163 7/28/2015
1.4.4.6387 2,069 7/27/2015
1.4.4.6379-pre3 682 7/20/2015
1.4.4.6378-pre2 516 7/16/2015
1.4.4.6377-pre1 491 7/14/2015
1.4.3.6376 35,341 7/9/2015
1.4.3.6374 15,030 7/1/2015
1.4.3.6372 1,224 6/30/2015
1.4.3.6364-pre3 1,446 6/16/2015
1.4.3.6358-pre2 4,790 4/24/2015
1.4.3.6356-pre1 566 4/21/2015
1.4.2.6359 53,048 4/30/2015
1.4.2.6355 12,577 4/21/2015
1.4.2.6353-pre2 1,633 3/31/2015
1.4.2.6350-pre1 731 3/30/2015
1.4.1.6349 42,154 3/30/2015
1.4.1.6347-pre2 2,421 3/19/2015
1.4.1.6342-pre1 849 3/10/2015
1.4.0.6341 26,812 3/9/2015
1.4.0.6340-pre2 1,507 3/6/2015
1.4.0.6336-pre1 728 3/3/2015
1.3.5.6337 4,225 3/5/2015
1.3.5.6335 20,263 3/2/2015
1.3.5.6333-pre1 1,095 2/17/2015
1.3.4.6332 16,047 2/17/2015
1.3.4.6331-pre4 661 2/13/2015
1.3.4.6329-pre3 449 2/12/2015
1.3.4.6328-pre2 480 2/11/2015
1.3.4.6325-pre1 455 2/9/2015
1.3.3.6323 47,607 2/9/2015
1.3.3.6322-pre3 414 2/6/2015
1.3.3.6321-pre2 580 2/4/2015
1.3.3.6318-pre1 539 2/2/2015
1.3.2.6316 6,578 2/3/2015
1.3.2.6313-pre3 513 1/30/2015
1.3.2.6309-pre2 570 1/28/2015
1.3.2.6299-pre1 1,279 1/20/2015
1.3.1.6296 49,812 1/4/2015
1.3.1.6294-pre1 3,480 12/24/2014
1.3.0.6292 8,391 12/24/2014
1.3.0.6286-pre4 1,326 12/19/2014
1.3.0.6284-pre3 848 12/12/2014
1.3.0.6280-pre2 759 12/9/2014
1.3.0.6275-pre1 7,017 11/12/2014
1.2.3.6257 35,814 10/2/2014
1.2.3.6256-pre4 1,447 9/26/2014
1.2.3.6255-pre3 1,832 9/20/2014
1.2.3.6249-pre2 1,044 9/9/2014
1.2.3.6246-pre1 3,461 8/15/2014
1.2.2.6243 26,201 7/30/2014
1.2.2.6241-pre3 1,964 7/28/2014
1.2.2.6240-pre2 3,756 7/22/2014
1.2.2.6238-pre1 2,810 7/17/2014
1.2.1.6229 7,218 7/14/2014
1.1.1.6206 13,320 6/19/2014
1.1.0.6201 11,855 6/12/2014
1.0.6197 3,215 6/4/2014
1.0.6188 10,360 5/28/2014
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