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
2.5.0.280555 12,284 2/16/2018
2.5.0.122203 114,213 12/18/2017
2.5.0.121934 98,777 11/28/2017
2.5.0.91635 69,545 11/16/2017
2.5.0.77107 13,049 11/13/2017
2.5.0.75255-pre3 1,924 11/10/2017
2.5.0.19271-pre2 5,063 10/20/2017
2.4.0.91020 14,072 11/16/2017
2.4.0.74863 22,330 11/10/2017
2.4.0.38779 42,301 10/30/2017
2.4.0.18342 36,896 10/20/2017
2.4.0.282 112,449 9/29/2017
2.4.0.280 81,711 9/27/2017
2.4.0.275-pre3 4,485 9/19/2017
2.4.0.269-pre2 9,739 8/29/2017
2.4.0.266-pre1 9,883 8/16/2017
2.3.5.256-pre6 23,761 6/29/2017
2.3.5.255-pre5 1,900 6/26/2017
2.3.5.239-pre3 21,829 5/11/2017
2.3.5.235-pre2 7,822 4/26/2017
2.3.5.233-pre1 5,655 4/13/2017
2.3.4.270 87,416 8/29/2017
2.3.4.267 48,412 8/16/2017
2.3.4.247 298,646 5/16/2017
2.3.4.231 165,508 4/12/2017
2.3.4.224 208,210 3/29/2017
2.3.4.221-pre6 4,571 3/27/2017
2.3.4.214-pre5 7,441 3/14/2017
2.3.4.212-pre4 3,418 3/10/2017
2.3.4.211-pre3 1,176 3/9/2017
2.3.4.192-pre2 15,326 2/3/2017
2.3.4.184-pre1 8,291 1/13/2017
2.3.3.193 191,932 2/1/2017
2.3.3.180 184,561 1/5/2017
2.3.3.175 108,155 12/6/2016
2.3.3.168 59,231 11/23/2016
2.3.3.166-pre4 6,125 11/3/2016
2.3.3.163-pre3 5,450 10/17/2016
2.3.3.152-pre2 12,846 9/15/2016
2.3.2.127 233,034 9/14/2016
2.3.2.118-pre1 5,981 8/3/2016
2.3.1.114 141,036 8/3/2016
2.3.1.113-pre3 2,915 7/19/2016
2.3.1.111-pre2 3,944 7/4/2016
2.3.1.110-pre1 1,608 6/29/2016
2.3.0.107 181,365 6/29/2016
2.3.0.49 68,261 6/16/2016
2.3.0.46-pre3 13,205 5/30/2016
2.3.0.38-pre2 11,243 4/27/2016
2.3.0.34-pre1 7,287 4/27/2016
2.2.0.45 100,689 5/30/2016
2.2.0.31 116,904 4/27/2016
2.2.0.23-pre4 2,302 4/20/2016
2.2.0.18-pre3 1,520 4/20/2016
2.2.0.5-pre2 15,148 4/8/2016
2.2.0.4-pre1 17,662 4/5/2016
2.1.0.6529 88,556 3/13/2016
2.1.0.6526 15,653 3/9/2016
2.1.0.6524 25,431 3/2/2016
2.1.0.6521 9,648 3/1/2016
2.1.0.6517-pre5 1,216 2/18/2016
2.1.0.6513-pre4 1,199 2/9/2016
2.1.0.6508-pre3 1,488 1/28/2016
2.1.0.6503-pre2 6,075 1/22/2016
2.1.0.6501-pre1 640 1/21/2016
2.1.0.6500-pre1 (current version) 481 1/20/2016
2.0.1.6505 85,352 1/28/2016
2.0.1.6495 69,273 1/20/2016
2.0.1.6492-pre1 2,937 12/3/2015
2.0.0.6490 87,174 12/1/2015
2.0.0.6484 16,432 11/21/2015
2.0.0.6482 213,783 11/17/2015
1.5.2.6478-pre3 395 11/17/2015
1.5.2.6477-pre2 2,774 11/10/2015
1.5.2.6469-pre1 1,224 10/20/2015
1.5.1.6471 69,841 10/20/2015
1.5.1.6468 2,838 10/20/2015
1.5.1.6460-pre2 705 10/13/2015
1.5.1.6455-pre1 1,920 10/2/2015
1.5.0.6447 43,970 9/25/2015
1.5.0.6446 19,338 9/16/2015
1.5.0.6404-pre3 2,366 8/25/2015
1.5.0.6401-pre2 534 8/21/2015
1.5.0.6396-pre1 1,089 8/5/2015
1.4.4.6449 1,645 9/25/2015
1.4.4.6443 729 9/16/2015
1.4.4.6392 68,012 7/29/2015
1.4.4.6391 1,126 7/28/2015
1.4.4.6387 2,039 7/27/2015
1.4.4.6379-pre3 651 7/20/2015
1.4.4.6378-pre2 488 7/16/2015
1.4.4.6377-pre1 451 7/14/2015
1.4.3.6376 34,156 7/9/2015
1.4.3.6374 14,630 7/1/2015
1.4.3.6372 1,184 6/30/2015
1.4.3.6364-pre3 1,390 6/16/2015
1.4.3.6358-pre2 4,685 4/24/2015
1.4.3.6356-pre1 533 4/21/2015
1.4.2.6359 50,957 4/30/2015
1.4.2.6355 12,201 4/21/2015
1.4.2.6353-pre2 1,587 3/31/2015
1.4.2.6350-pre1 680 3/30/2015
1.4.1.6349 41,623 3/30/2015
1.4.1.6347-pre2 2,388 3/19/2015
1.4.1.6342-pre1 817 3/10/2015
1.4.0.6341 26,532 3/9/2015
1.4.0.6340-pre2 1,430 3/6/2015
1.4.0.6336-pre1 696 3/3/2015
1.3.5.6337 4,157 3/5/2015
1.3.5.6335 19,228 3/2/2015
1.3.5.6333-pre1 1,067 2/17/2015
1.3.4.6332 15,711 2/17/2015
1.3.4.6331-pre4 634 2/13/2015
1.3.4.6329-pre3 418 2/12/2015
1.3.4.6328-pre2 455 2/11/2015
1.3.4.6325-pre1 428 2/9/2015
1.3.3.6323 46,045 2/9/2015
1.3.3.6322-pre3 389 2/6/2015
1.3.3.6321-pre2 553 2/4/2015
1.3.3.6318-pre1 513 2/2/2015
1.3.2.6316 6,457 2/3/2015
1.3.2.6313-pre3 488 1/30/2015
1.3.2.6309-pre2 543 1/28/2015
1.3.2.6299-pre1 1,253 1/20/2015
1.3.1.6296 48,367 1/4/2015
1.3.1.6294-pre1 3,392 12/24/2014
1.3.0.6292 8,286 12/24/2014
1.3.0.6286-pre4 1,299 12/19/2014
1.3.0.6284-pre3 822 12/12/2014
1.3.0.6280-pre2 731 12/9/2014
1.3.0.6275-pre1 6,976 11/12/2014
1.2.3.6257 35,243 10/2/2014
1.2.3.6256-pre4 1,421 9/26/2014
1.2.3.6255-pre3 1,794 9/20/2014
1.2.3.6249-pre2 1,017 9/9/2014
1.2.3.6246-pre1 3,401 8/15/2014
1.2.2.6243 25,714 7/30/2014
1.2.2.6241-pre3 1,922 7/28/2014
1.2.2.6240-pre2 3,713 7/22/2014
1.2.2.6238-pre1 2,757 7/17/2014
1.2.1.6229 7,116 7/14/2014
1.1.1.6206 13,263 6/19/2014
1.1.0.6201 11,607 6/12/2014
1.0.6197 3,141 6/4/2014
1.0.6188 10,232 5/28/2014
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