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There is a newer version of this package available.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
4.0.0.8055-pre1 2,433 12/4/2018
3.4.0.1008975 71,227 11/15/2018
3.4.0.987044-pre2 1,774 11/8/2018
3.4.0.925479-pre1 5,893 10/18/2018
3.3.0.967583 71,902 11/1/2018
3.3.0.912540 65,339 10/18/2018
3.3.0.893527-pre3 3,533 10/11/2018
3.3.0.871608-pre2 6,028 10/1/2018
3.3.0.840541-pre1 2,942 9/20/2018
3.2.0.871581 59,900 10/3/2018
3.2.0.839982 71,758 9/17/2018
3.2.0.809874-pre3 2,731 9/10/2018
3.2.0.729530-pre2 7,453 8/14/2018
3.2.0.637442-pre1 6,719 7/17/2018
3.1.0.697729 246,322 8/1/2018
3.1.0.637273 74,447 7/11/2018
3.1.0.583944 110,724 6/20/2018
3.1.0.561732-pre4 5,138 6/11/2018
3.1.0.550168-pre3 2,367 6/6/2018
3.1.0.530888-pre2 1,329 6/4/2018
3.1.0.469394-pre1 10,144 5/9/2018
3.0.0.561731 122,676 6/11/2018
3.0.0.550146 22,911 6/6/2018
3.0.0.530893 17,000 6/4/2018
3.0.0.482510 178,109 5/14/2018
3.0.0.446417 98,537 5/1/2018
3.0.0.427558-pre4 7,730 4/25/2018
3.0.0.354232-pre3 12,314 4/5/2018
3.0.0.296286-pre2 7,476 3/20/2018
2.5.1.527436 58,266 5/4/2018
2.5.1.444934 130,789 4/4/2018
2.5.1.392594-pre3 3,707 3/21/2018
2.5.1.340284-pre2 5,369 3/9/2018
2.5.1.317207-pre1 5,157 3/1/2018
2.5.0.280555 275,605 2/16/2018
2.5.0.122203 278,539 12/18/2017
2.5.0.121934 176,848 11/28/2017
2.5.0.91635 118,689 11/16/2017
2.5.0.77107 25,896 11/13/2017
2.5.0.75255-pre3 4,912 11/10/2017
2.5.0.19271-pre2 8,367 10/20/2017
2.4.0.91020 39,222 11/16/2017
2.4.0.74863 32,400 11/10/2017
2.4.0.38779 56,184 10/30/2017
2.4.0.18342 51,590 10/20/2017
2.4.0.282 149,394 9/29/2017
2.4.0.280 162,844 9/27/2017
2.4.0.275-pre3 7,555 9/19/2017
2.4.0.269-pre2 12,872 8/29/2017
2.4.0.266-pre1 17,619 8/16/2017
2.3.5.256-pre6 32,441 6/29/2017
2.3.5.255-pre5 4,416 6/26/2017
2.3.5.239-pre3 26,702 5/11/2017
2.3.5.235-pre2 10,694 4/26/2017
2.3.5.233-pre1 8,521 4/13/2017
2.3.4.270 123,038 8/29/2017
2.3.4.267 60,859 8/16/2017
2.3.4.247 369,882 5/16/2017
2.3.4.231 196,554 4/12/2017
2.3.4.224 235,789 3/29/2017
2.3.4.221-pre6 6,874 3/27/2017
2.3.4.214-pre5 9,719 3/14/2017
2.3.4.212-pre4 5,769 3/10/2017
2.3.4.211-pre3 3,604 3/9/2017
2.3.4.192-pre2 18,583 2/3/2017
2.3.4.184-pre1 11,816 1/13/2017
2.3.3.193 226,438 2/1/2017
2.3.3.180 201,288 1/5/2017
2.3.3.175 114,938 12/6/2016
2.3.3.168 63,880 11/23/2016
2.3.3.166-pre4 7,222 11/3/2016
2.3.3.163-pre3 6,063 10/17/2016
2.3.3.152-pre2 15,016 9/15/2016
2.3.2.127 256,980 9/14/2016
2.3.2.118-pre1 6,509 8/3/2016
2.3.1.114 151,889 8/3/2016
2.3.1.113-pre3 3,524 7/19/2016
2.3.1.111-pre2 4,488 7/4/2016
2.3.1.110-pre1 2,163 6/29/2016
2.3.0.107 193,467 6/29/2016
2.3.0.49 81,600 6/16/2016
2.3.0.46-pre3 15,255 5/30/2016
2.3.0.38-pre2 12,517 4/27/2016
2.3.0.34-pre1 8,249 4/27/2016
2.2.0.45 114,594 5/30/2016
2.2.0.31 124,621 4/27/2016
2.2.0.23-pre4 2,819 4/20/2016
2.2.0.18-pre3 2,016 4/20/2016
2.2.0.5-pre2 15,668 4/8/2016
2.2.0.4-pre1 18,201 4/5/2016
2.1.0.6529 95,099 3/13/2016
2.1.0.6526 16,792 3/9/2016
2.1.0.6524 29,677 3/2/2016
2.1.0.6521 11,346 3/1/2016
2.1.0.6517-pre5 1,709 2/18/2016
2.1.0.6513-pre4 1,695 2/9/2016
2.1.0.6508-pre3 1,998 1/28/2016
2.1.0.6503-pre2 6,591 1/22/2016
2.1.0.6501-pre1 1,129 1/21/2016
2.1.0.6500-pre1 981 1/20/2016
2.0.1.6505 90,793 1/28/2016
2.0.1.6495 73,575 1/20/2016
2.0.1.6492-pre1 3,412 12/3/2015
2.0.0.6490 94,259 12/1/2015
2.0.0.6484 17,269 11/21/2015
2.0.0.6482 230,692 11/17/2015
1.5.2.6478-pre3 835 11/17/2015
1.5.2.6477-pre2 3,410 11/10/2015
1.5.2.6469-pre1 1,758 10/20/2015
1.5.1.6471 74,163 10/20/2015
1.5.1.6468 3,438 10/20/2015
1.5.1.6460-pre2 1,215 10/13/2015
1.5.1.6455-pre1 2,527 10/2/2015
1.5.0.6447 50,434 9/25/2015
1.5.0.6446 20,784 9/16/2015
1.5.0.6404-pre3 2,888 8/25/2015
1.5.0.6401-pre2 1,034 8/21/2015
1.5.0.6396-pre1 1,558 8/5/2015
1.4.4.6449 2,269 9/25/2015
1.4.4.6443 1,243 9/16/2015
1.4.4.6392 74,387 7/29/2015
1.4.4.6391 1,617 7/28/2015
1.4.4.6387 2,515 7/27/2015
1.4.4.6379-pre3 1,112 7/20/2015
1.4.4.6378-pre2 947 7/16/2015
1.4.4.6377-pre1 931 7/14/2015
1.4.3.6376 39,722 7/9/2015
1.4.3.6374 15,987 7/1/2015
1.4.3.6372 1,666 6/30/2015
1.4.3.6364-pre3 1,894 6/16/2015
1.4.3.6358-pre2 5,321 4/24/2015
1.4.3.6356-pre1 995 4/21/2015
1.4.2.6359 58,781 4/30/2015
1.4.2.6355 13,642 4/21/2015
1.4.2.6353-pre2 2,085 3/31/2015
1.4.2.6350-pre1 1,176 3/30/2015
1.4.1.6349 43,488 3/30/2015
1.4.1.6347-pre2 2,852 3/19/2015
1.4.1.6342-pre1 1,271 3/10/2015
1.4.0.6341 27,952 3/9/2015
1.4.0.6340-pre2 2,060 3/6/2015
1.4.0.6336-pre1 1,149 3/3/2015
1.3.5.6337 4,702 3/5/2015
1.3.5.6335 22,689 3/2/2015
1.3.5.6333-pre1 1,539 2/17/2015
1.3.4.6332 17,642 2/17/2015
1.3.4.6331-pre4 1,083 2/13/2015
1.3.4.6329-pre3 876 2/12/2015
1.3.4.6328-pre2 896 2/11/2015
1.3.4.6325-pre1 876 2/9/2015
1.3.3.6323 50,900 2/9/2015
1.3.3.6322-pre3 830 2/6/2015
1.3.3.6321-pre2 1,005 2/4/2015
1.3.3.6318-pre1 965 2/2/2015
1.3.2.6316 7,177 2/3/2015
1.3.2.6313-pre3 937 1/30/2015
1.3.2.6309-pre2 991 1/28/2015
1.3.2.6299-pre1 1,706 1/20/2015
1.3.1.6296 53,106 1/4/2015
1.3.1.6294-pre1 3,985 12/24/2014
1.3.0.6292 9,030 12/24/2014
1.3.0.6286-pre4 1,760 12/19/2014
1.3.0.6284-pre3 1,270 12/12/2014
1.3.0.6280-pre2 1,181 12/9/2014
1.3.0.6275-pre1 7,449 11/12/2014
1.2.3.6257 37,557 10/2/2014
1.2.3.6256-pre4 1,885 9/26/2014
1.2.3.6255-pre3 2,272 9/20/2014
1.2.3.6249-pre2 1,465 9/9/2014
1.2.3.6246-pre1 3,979 8/15/2014
1.2.2.6243 27,705 7/30/2014
1.2.2.6241-pre3 2,401 7/28/2014
1.2.2.6240-pre2 4,230 7/22/2014
1.2.2.6238-pre1 3,336 7/17/2014
1.2.1.6229 7,961 7/14/2014
1.1.1.6206 13,806 6/19/2014
1.1.0.6201 12,797 6/12/2014
1.0.6197 3,785 6/4/2014
1.0.6188 11,175 5/28/2014
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