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
3.1.0.583944 189 6/20/2018
3.1.0.561732-pre4 2,555 6/11/2018
3.1.0.550168-pre3 1,483 6/6/2018
3.1.0.530888-pre2 925 6/4/2018
3.1.0.469394-pre1 7,174 5/9/2018
3.0.0.561731 22,819 6/11/2018
3.0.0.550146 13,985 6/6/2018
3.0.0.530893 9,832 6/4/2018
3.0.0.482510 92,249 5/14/2018
3.0.0.446417 60,903 5/1/2018
3.0.0.427558-pre4 6,137 4/25/2018
3.0.0.354232-pre3 8,560 4/5/2018
3.0.0.296286-pre2 6,244 3/20/2018
2.5.1.527436 25,456 5/4/2018
2.5.1.444934 91,241 4/4/2018
2.5.1.392594-pre3 2,790 3/21/2018
2.5.1.340284-pre2 4,428 3/9/2018
2.5.1.317207-pre1 4,262 3/1/2018
2.5.0.280555 223,987 2/16/2018
2.5.0.122203 220,912 12/18/2017
2.5.0.121934 146,720 11/28/2017
2.5.0.91635 97,836 11/16/2017
2.5.0.77107 21,313 11/13/2017
2.5.0.75255-pre3 4,010 11/10/2017
2.5.0.19271-pre2 7,073 10/20/2017
2.4.0.91020 29,733 11/16/2017
2.4.0.74863 28,949 11/10/2017
2.4.0.38779 51,952 10/30/2017
2.4.0.18342 46,434 10/20/2017
2.4.0.282 134,739 9/29/2017
2.4.0.280 128,129 9/27/2017
2.4.0.275-pre3 6,626 9/19/2017
2.4.0.269-pre2 11,837 8/29/2017
2.4.0.266-pre1 14,979 8/16/2017
2.3.5.256-pre6 28,639 6/29/2017
2.3.5.255-pre5 3,653 6/26/2017
2.3.5.239-pre3 24,847 5/11/2017
2.3.5.235-pre2 9,696 4/26/2017
2.3.5.233-pre1 7,579 4/13/2017
2.3.4.270 107,501 8/29/2017
2.3.4.267 55,047 8/16/2017
2.3.4.247 339,615 5/16/2017
2.3.4.231 183,687 4/12/2017
2.3.4.224 223,585 3/29/2017
2.3.4.221-pre6 6,140 3/27/2017
2.3.4.214-pre5 9,009 3/14/2017
2.3.4.212-pre4 5,083 3/10/2017
2.3.4.211-pre3 2,850 3/9/2017
2.3.4.192-pre2 17,503 2/3/2017
2.3.4.184-pre1 10,440 1/13/2017
2.3.3.193 210,026 2/1/2017
2.3.3.180 193,480 1/5/2017
2.3.3.175 111,789 12/6/2016
2.3.3.168 61,807 11/23/2016
2.3.3.166-pre4 6,525 11/3/2016
2.3.3.163-pre3 5,611 10/17/2016
2.3.3.152-pre2 13,833 9/15/2016
2.3.2.127 247,782 9/14/2016
2.3.2.118-pre1 6,101 8/3/2016
2.3.1.114 147,020 8/3/2016
2.3.1.113-pre3 3,089 7/19/2016
2.3.1.111-pre2 4,061 7/4/2016
2.3.1.110-pre1 1,740 6/29/2016
2.3.0.107 189,456 6/29/2016
2.3.0.49 74,661 6/16/2016
2.3.0.46-pre3 14,224 5/30/2016
2.3.0.38-pre2 11,695 4/27/2016
2.3.0.34-pre1 7,630 4/27/2016
2.2.0.45 107,938 5/30/2016
2.2.0.31 120,947 4/27/2016
2.2.0.23-pre4 2,425 4/20/2016
2.2.0.18-pre3 1,633 4/20/2016
2.2.0.5-pre2 15,262 4/8/2016
2.2.0.4-pre1 17,805 4/5/2016
2.1.0.6529 91,923 3/13/2016
2.1.0.6526 16,178 3/9/2016
2.1.0.6524 26,062 3/2/2016
2.1.0.6521 10,559 3/1/2016
2.1.0.6517-pre5 1,323 2/18/2016
2.1.0.6513-pre4 1,306 2/9/2016
2.1.0.6508-pre3 1,604 1/28/2016
2.1.0.6503-pre2 6,192 1/22/2016
2.1.0.6501-pre1 742 1/21/2016
2.1.0.6500-pre1 (current) 592 1/20/2016
2.0.1.6505 88,243 1/28/2016
2.0.1.6495 71,814 1/20/2016
2.0.1.6492-pre1 3,030 12/3/2015
2.0.0.6490 90,768 12/1/2015
2.0.0.6484 16,730 11/21/2015
2.0.0.6482 222,520 11/17/2015
1.5.2.6478-pre3 461 11/17/2015
1.5.2.6477-pre2 2,956 11/10/2015
1.5.2.6469-pre1 1,335 10/20/2015
1.5.1.6471 71,942 10/20/2015
1.5.1.6468 2,999 10/20/2015
1.5.1.6460-pre2 824 10/13/2015
1.5.1.6455-pre1 2,101 10/2/2015
1.5.0.6447 47,093 9/25/2015
1.5.0.6446 19,934 9/16/2015
1.5.0.6404-pre3 2,484 8/25/2015
1.5.0.6401-pre2 645 8/21/2015
1.5.0.6396-pre1 1,167 8/5/2015
1.4.4.6449 1,831 9/25/2015
1.4.4.6443 850 9/16/2015
1.4.4.6392 71,703 7/29/2015
1.4.4.6391 1,220 7/28/2015
1.4.4.6387 2,118 7/27/2015
1.4.4.6379-pre3 727 7/20/2015
1.4.4.6378-pre2 562 7/16/2015
1.4.4.6377-pre1 539 7/14/2015
1.4.3.6376 36,611 7/9/2015
1.4.3.6374 15,283 7/1/2015
1.4.3.6372 1,275 6/30/2015
1.4.3.6364-pre3 1,492 6/16/2015
1.4.3.6358-pre2 4,887 4/24/2015
1.4.3.6356-pre1 611 4/21/2015
1.4.2.6359 55,082 4/30/2015
1.4.2.6355 12,839 4/21/2015
1.4.2.6353-pre2 1,687 3/31/2015
1.4.2.6350-pre1 787 3/30/2015
1.4.1.6349 42,519 3/30/2015
1.4.1.6347-pre2 2,466 3/19/2015
1.4.1.6342-pre1 892 3/10/2015
1.4.0.6341 27,070 3/9/2015
1.4.0.6340-pre2 1,592 3/6/2015
1.4.0.6336-pre1 770 3/3/2015
1.3.5.6337 4,286 3/5/2015
1.3.5.6335 21,025 3/2/2015
1.3.5.6333-pre1 1,143 2/17/2015
1.3.4.6332 16,387 2/17/2015
1.3.4.6331-pre4 704 2/13/2015
1.3.4.6329-pre3 494 2/12/2015
1.3.4.6328-pre2 522 2/11/2015
1.3.4.6325-pre1 495 2/9/2015
1.3.3.6323 48,674 2/9/2015
1.3.3.6322-pre3 457 2/6/2015
1.3.3.6321-pre2 624 2/4/2015
1.3.3.6318-pre1 582 2/2/2015
1.3.2.6316 6,669 2/3/2015
1.3.2.6313-pre3 556 1/30/2015
1.3.2.6309-pre2 612 1/28/2015
1.3.2.6299-pre1 1,324 1/20/2015
1.3.1.6296 50,850 1/4/2015
1.3.1.6294-pre1 3,537 12/24/2014
1.3.0.6292 8,502 12/24/2014
1.3.0.6286-pre4 1,371 12/19/2014
1.3.0.6284-pre3 890 12/12/2014
1.3.0.6280-pre2 802 12/9/2014
1.3.0.6275-pre1 7,067 11/12/2014
1.2.3.6257 36,301 10/2/2014
1.2.3.6256-pre4 1,492 9/26/2014
1.2.3.6255-pre3 1,877 9/20/2014
1.2.3.6249-pre2 1,086 9/9/2014
1.2.3.6246-pre1 3,536 8/15/2014
1.2.2.6243 26,610 7/30/2014
1.2.2.6241-pre3 2,015 7/28/2014
1.2.2.6240-pre2 3,815 7/22/2014
1.2.2.6238-pre1 2,893 7/17/2014
1.2.1.6229 7,366 7/14/2014
1.1.1.6206 13,382 6/19/2014
1.1.0.6201 12,076 6/12/2014
1.0.6197 3,299 6/4/2014
1.0.6188 10,526 5/28/2014
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