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.
Install-Package Xamarin.Forms -Version 2.1.0.6500-pre1
dotnet add package Xamarin.Forms --version 2.1.0.6500-pre1

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
2.4.0.266-pre1 1,661 8/16/2017
2.3.5.256-pre6 13,450 6/29/2017
2.3.5.255-pre5 1,590 6/26/2017
2.3.5.239-pre3 15,746 5/11/2017
2.3.5.235-pre2 6,401 4/26/2017
2.3.5.233-pre1 4,290 4/13/2017
2.3.4.267 11,163 8/16/2017
2.3.4.247 177,869 5/16/2017
2.3.4.231 120,172 4/12/2017
2.3.4.224 143,772 3/29/2017
2.3.4.221-pre6 4,106 3/27/2017
2.3.4.214-pre5 6,856 3/14/2017
2.3.4.212-pre4 2,901 3/10/2017
2.3.4.211-pre3 966 3/9/2017
2.3.4.192-pre2 13,751 2/3/2017
2.3.4.184-pre1 6,984 1/13/2017
2.3.3.193 151,551 2/1/2017
2.3.3.180 154,495 1/5/2017
2.3.3.175 100,521 12/6/2016
2.3.3.168 53,536 11/23/2016
2.3.3.166-pre4 5,642 11/3/2016
2.3.3.163-pre3 5,138 10/17/2016
2.3.3.152-pre2 11,465 9/15/2016
2.3.2.127 202,066 9/14/2016
2.3.2.118-pre1 5,760 8/3/2016
2.3.1.114 129,511 8/3/2016
2.3.1.113-pre3 2,638 7/19/2016
2.3.1.111-pre2 3,807 7/4/2016
2.3.1.110-pre1 1,466 6/29/2016
2.3.0.107 159,598 6/29/2016
2.3.0.49 59,565 6/16/2016
2.3.0.46-pre3 11,295 5/30/2016
2.3.0.38-pre2 10,664 4/27/2016
2.3.0.34-pre1 6,827 4/27/2016
2.2.0.45 88,190 5/30/2016
2.2.0.31 109,917 4/27/2016
2.2.0.23-pre4 2,152 4/20/2016
2.2.0.18-pre3 1,281 4/20/2016
2.2.0.5-pre2 14,974 4/8/2016
2.2.0.4-pre1 17,495 4/5/2016
2.1.0.6529 82,380 3/13/2016
2.1.0.6526 14,813 3/9/2016
2.1.0.6524 24,179 3/2/2016
2.1.0.6521 8,207 3/1/2016
2.1.0.6517-pre5 1,098 2/18/2016
2.1.0.6513-pre4 1,045 2/9/2016
2.1.0.6508-pre3 1,334 1/28/2016
2.1.0.6503-pre2 5,890 1/22/2016
2.1.0.6501-pre1 495 1/21/2016
2.1.0.6500-pre1 (current version) 335 1/20/2016
2.0.1.6505 79,959 1/28/2016
2.0.1.6495 64,078 1/20/2016
2.0.1.6492-pre1 2,811 12/3/2015
2.0.0.6490 79,476 12/1/2015
2.0.0.6484 15,933 11/21/2015
2.0.0.6482 196,761 11/17/2015
1.5.2.6478-pre3 303 11/17/2015
1.5.2.6477-pre2 2,458 11/10/2015
1.5.2.6469-pre1 1,071 10/20/2015
1.5.1.6471 66,243 10/20/2015
1.5.1.6468 2,644 10/20/2015
1.5.1.6460-pre2 554 10/13/2015
1.5.1.6455-pre1 1,565 10/2/2015
1.5.0.6447 39,680 9/25/2015
1.5.0.6446 18,005 9/16/2015
1.5.0.6404-pre3 2,160 8/25/2015
1.5.0.6401-pre2 389 8/21/2015
1.5.0.6396-pre1 969 8/5/2015
1.4.4.6449 1,401 9/25/2015
1.4.4.6443 579 9/16/2015
1.4.4.6392 51,144 7/29/2015
1.4.4.6391 1,024 7/28/2015
1.4.4.6387 1,934 7/27/2015
1.4.4.6379-pre3 559 7/20/2015
1.4.4.6378-pre2 399 7/16/2015
1.4.4.6377-pre1 361 7/14/2015
1.4.3.6376 29,328 7/9/2015
1.4.3.6374 13,529 7/1/2015
1.4.3.6372 1,063 6/30/2015
1.4.3.6364-pre3 1,279 6/16/2015
1.4.3.6358-pre2 4,399 4/24/2015
1.4.3.6356-pre1 442 4/21/2015
1.4.2.6359 45,966 4/30/2015
1.4.2.6355 11,191 4/21/2015
1.4.2.6353-pre2 1,456 3/31/2015
1.4.2.6350-pre1 499 3/30/2015
1.4.1.6349 32,317 3/30/2015
1.4.1.6347-pre2 2,263 3/19/2015
1.4.1.6342-pre1 723 3/10/2015
1.4.0.6341 25,166 3/9/2015
1.4.0.6340-pre2 1,135 3/6/2015
1.4.0.6336-pre1 606 3/3/2015
1.3.5.6337 3,976 3/5/2015
1.3.5.6335 16,387 3/2/2015
1.3.5.6333-pre1 976 2/17/2015
1.3.4.6332 14,551 2/17/2015
1.3.4.6331-pre4 541 2/13/2015
1.3.4.6329-pre3 329 2/12/2015
1.3.4.6328-pre2 366 2/11/2015
1.3.4.6325-pre1 339 2/9/2015
1.3.3.6323 40,922 2/9/2015
1.3.3.6322-pre3 300 2/6/2015
1.3.3.6321-pre2 460 2/4/2015
1.3.3.6318-pre1 421 2/2/2015
1.3.2.6316 6,019 2/3/2015
1.3.2.6313-pre3 397 1/30/2015
1.3.2.6309-pre2 451 1/28/2015
1.3.2.6299-pre1 1,156 1/20/2015
1.3.1.6296 43,142 1/4/2015
1.3.1.6294-pre1 3,151 12/24/2014
1.3.0.6292 7,944 12/24/2014
1.3.0.6286-pre4 1,190 12/19/2014
1.3.0.6284-pre3 731 12/12/2014
1.3.0.6280-pre2 640 12/9/2014
1.3.0.6275-pre1 6,866 11/12/2014
1.2.3.6257 33,321 10/2/2014
1.2.3.6256-pre4 1,326 9/26/2014
1.2.3.6255-pre3 1,658 9/20/2014
1.2.3.6249-pre2 925 9/9/2014
1.2.3.6246-pre1 3,182 8/15/2014
1.2.2.6243 24,154 7/30/2014
1.2.2.6241-pre3 1,787 7/28/2014
1.2.2.6240-pre2 3,518 7/22/2014
1.2.2.6238-pre1 2,551 7/17/2014
1.2.1.6229 6,715 7/14/2014
1.1.1.6206 13,086 6/19/2014
1.1.0.6201 10,666 6/12/2014
1.0.6197 2,932 6/4/2014
1.0.6188 9,860 5/28/2014
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