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There is a newer version of this package available.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
3.2.0.729530-pre2 932 8/14/2018
3.2.0.637442-pre1 5,278 7/17/2018
3.1.0.697729 34,697 8/1/2018
3.1.0.637273 46,234 7/11/2018
3.1.0.583944 78,719 6/20/2018
3.1.0.561732-pre4 3,965 6/11/2018
3.1.0.550168-pre3 2,041 6/6/2018
3.1.0.530888-pre2 1,092 6/4/2018
3.1.0.469394-pre1 9,039 5/9/2018
3.0.0.561731 92,985 6/11/2018
3.0.0.550146 18,859 6/6/2018
3.0.0.530893 13,343 6/4/2018
3.0.0.482510 137,593 5/14/2018
3.0.0.446417 75,748 5/1/2018
3.0.0.427558-pre4 7,035 4/25/2018
3.0.0.354232-pre3 10,309 4/5/2018
3.0.0.296286-pre2 6,956 3/20/2018
2.5.1.527436 39,109 5/4/2018
2.5.1.444934 108,075 4/4/2018
2.5.1.392594-pre3 3,462 3/21/2018
2.5.1.340284-pre2 5,039 3/9/2018
2.5.1.317207-pre1 4,906 3/1/2018
2.5.0.280555 244,836 2/16/2018
2.5.0.122203 245,181 12/18/2017
2.5.0.121934 158,067 11/28/2017
2.5.0.91635 107,097 11/16/2017
2.5.0.77107 23,407 11/13/2017
2.5.0.75255-pre3 4,652 11/10/2017
2.5.0.19271-pre2 7,831 10/20/2017
2.4.0.91020 34,243 11/16/2017
2.4.0.74863 30,913 11/10/2017
2.4.0.38779 53,937 10/30/2017
2.4.0.18342 48,879 10/20/2017
2.4.0.282 140,734 9/29/2017
2.4.0.280 141,395 9/27/2017
2.4.0.275-pre3 7,298 9/19/2017
2.4.0.269-pre2 12,474 8/29/2017
2.4.0.266-pre1 16,483 8/16/2017
2.3.5.256-pre6 30,160 6/29/2017
2.3.5.255-pre5 4,181 6/26/2017
2.3.5.239-pre3 25,943 5/11/2017
2.3.5.235-pre2 10,360 4/26/2017
2.3.5.233-pre1 8,164 4/13/2017
2.3.4.270 114,125 8/29/2017
2.3.4.267 57,110 8/16/2017
2.3.4.247 351,461 5/16/2017
2.3.4.231 189,165 4/12/2017
2.3.4.224 228,337 3/29/2017
2.3.4.221-pre6 6,593 3/27/2017
2.3.4.214-pre5 9,399 3/14/2017
2.3.4.212-pre4 5,512 3/10/2017
2.3.4.211-pre3 3,373 3/9/2017
2.3.4.192-pre2 18,120 2/3/2017
2.3.4.184-pre1 11,156 1/13/2017
2.3.3.193 216,148 2/1/2017
2.3.3.180 196,592 1/5/2017
2.3.3.175 113,084 12/6/2016
2.3.3.168 62,621 11/23/2016
2.3.3.166-pre4 6,698 11/3/2016
2.3.3.163-pre3 5,742 10/17/2016
2.3.3.152-pre2 14,270 9/15/2016
2.3.2.127 251,256 9/14/2016
2.3.2.118-pre1 6,211 8/3/2016
2.3.1.114 149,042 8/3/2016
2.3.1.113-pre3 3,202 7/19/2016
2.3.1.111-pre2 4,163 7/4/2016
2.3.1.110-pre1 1,840 6/29/2016
2.3.0.107 191,064 6/29/2016
2.3.0.49 77,463 6/16/2016
2.3.0.46-pre3 14,574 5/30/2016
2.3.0.38-pre2 11,952 4/27/2016
2.3.0.34-pre1 7,816 4/27/2016
2.2.0.45 110,735 5/30/2016
2.2.0.31 122,235 4/27/2016
2.2.0.23-pre4 2,526 4/20/2016
2.2.0.18-pre3 1,729 4/20/2016
2.2.0.5-pre2 15,370 4/8/2016
2.2.0.4-pre1 17,903 4/5/2016
2.1.0.6529 93,127 3/13/2016
2.1.0.6526 16,385 3/9/2016
2.1.0.6524 26,381 3/2/2016
2.1.0.6521 10,838 3/1/2016
2.1.0.6517-pre5 1,418 2/18/2016
2.1.0.6513-pre4 1,401 2/9/2016
2.1.0.6508-pre3 1,702 1/28/2016
2.1.0.6503-pre2 6,291 1/22/2016
2.1.0.6501-pre1 838 1/21/2016
2.1.0.6500-pre1 (current) 686 1/20/2016
2.0.1.6505 89,160 1/28/2016
2.0.1.6495 72,516 1/20/2016
2.0.1.6492-pre1 3,128 12/3/2015
2.0.0.6490 92,084 12/1/2015
2.0.0.6484 16,869 11/21/2015
2.0.0.6482 225,598 11/17/2015
1.5.2.6478-pre3 557 11/17/2015
1.5.2.6477-pre2 3,085 11/10/2015
1.5.2.6469-pre1 1,432 10/20/2015
1.5.1.6471 72,718 10/20/2015
1.5.1.6468 3,110 10/20/2015
1.5.1.6460-pre2 921 10/13/2015
1.5.1.6455-pre1 2,212 10/2/2015
1.5.0.6447 48,131 9/25/2015
1.5.0.6446 20,231 9/16/2015
1.5.0.6404-pre3 2,589 8/25/2015
1.5.0.6401-pre2 744 8/21/2015
1.5.0.6396-pre1 1,264 8/5/2015
1.4.4.6449 1,944 9/25/2015
1.4.4.6443 948 9/16/2015
1.4.4.6392 72,704 7/29/2015
1.4.4.6391 1,319 7/28/2015
1.4.4.6387 2,216 7/27/2015
1.4.4.6379-pre3 822 7/20/2015
1.4.4.6378-pre2 657 7/16/2015
1.4.4.6377-pre1 633 7/14/2015
1.4.3.6376 37,673 7/9/2015
1.4.3.6374 15,552 7/1/2015
1.4.3.6372 1,371 6/30/2015
1.4.3.6364-pre3 1,588 6/16/2015
1.4.3.6358-pre2 5,008 4/24/2015
1.4.3.6356-pre1 706 4/21/2015
1.4.2.6359 56,620 4/30/2015
1.4.2.6355 13,084 4/21/2015
1.4.2.6353-pre2 1,791 3/31/2015
1.4.2.6350-pre1 887 3/30/2015
1.4.1.6349 42,809 3/30/2015
1.4.1.6347-pre2 2,561 3/19/2015
1.4.1.6342-pre1 987 3/10/2015
1.4.0.6341 27,341 3/9/2015
1.4.0.6340-pre2 1,711 3/6/2015
1.4.0.6336-pre1 865 3/3/2015
1.3.5.6337 4,399 3/5/2015
1.3.5.6335 21,568 3/2/2015
1.3.5.6333-pre1 1,245 2/17/2015
1.3.4.6332 16,731 2/17/2015
1.3.4.6331-pre4 801 2/13/2015
1.3.4.6329-pre3 591 2/12/2015
1.3.4.6328-pre2 619 2/11/2015
1.3.4.6325-pre1 592 2/9/2015
1.3.3.6323 49,461 2/9/2015
1.3.3.6322-pre3 553 2/6/2015
1.3.3.6321-pre2 721 2/4/2015
1.3.3.6318-pre1 681 2/2/2015
1.3.2.6316 6,811 2/3/2015
1.3.2.6313-pre3 654 1/30/2015
1.3.2.6309-pre2 710 1/28/2015
1.3.2.6299-pre1 1,423 1/20/2015
1.3.1.6296 51,665 1/4/2015
1.3.1.6294-pre1 3,655 12/24/2014
1.3.0.6292 8,649 12/24/2014
1.3.0.6286-pre4 1,470 12/19/2014
1.3.0.6284-pre3 988 12/12/2014
1.3.0.6280-pre2 901 12/9/2014
1.3.0.6275-pre1 7,166 11/12/2014
1.2.3.6257 36,724 10/2/2014
1.2.3.6256-pre4 1,589 9/26/2014
1.2.3.6255-pre3 1,978 9/20/2014
1.2.3.6249-pre2 1,185 9/9/2014
1.2.3.6246-pre1 3,655 8/15/2014
1.2.2.6243 26,996 7/30/2014
1.2.2.6241-pre3 2,114 7/28/2014
1.2.2.6240-pre2 3,921 7/22/2014
1.2.2.6238-pre1 3,016 7/17/2014
1.2.1.6229 7,532 7/14/2014
1.1.1.6206 13,496 6/19/2014
1.1.0.6201 12,305 6/12/2014
1.0.6197 3,443 6/4/2014
1.0.6188 10,706 5/28/2014
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