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There is a newer version of this package available.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
4.0.0.169046-pre5 0 2/21/2019
4.0.0.135214-pre4 2,771 2/6/2019
4.0.0.94569-pre3 3,258 1/24/2019
4.0.0.62955-pre2 7,563 1/10/2019
4.0.0.8055-pre1 9,463 12/4/2018
3.6.0.169048-pre2 0 2/21/2019
3.6.0.135200-pre1 370 2/6/2019
3.5.0.169047 498 2/20/2019
3.5.0.129452 33,232 2/6/2019
3.5.0.94564-pre3 467 1/24/2019
3.5.0.62956-pre2 598 1/10/2019
3.4.0.1029999 37,624 1/24/2019
3.4.0.1009999 53,232 1/4/2019
3.4.0.1008975 204,845 11/15/2018
3.4.0.987044-pre2 2,044 11/8/2018
3.4.0.925479-pre1 7,196 10/18/2018
3.3.0.967583 117,305 11/1/2018
3.3.0.912540 82,359 10/18/2018
3.3.0.893527-pre3 4,564 10/11/2018
3.3.0.871608-pre2 7,487 10/1/2018
3.3.0.840541-pre1 3,683 9/20/2018
3.2.0.871581 72,448 10/3/2018
3.2.0.839982 89,794 9/17/2018
3.2.0.809874-pre3 3,098 9/10/2018
3.2.0.729530-pre2 9,040 8/14/2018
3.2.0.637442-pre1 7,587 7/17/2018
3.1.0.697729 271,437 8/1/2018
3.1.0.637273 83,320 7/11/2018
3.1.0.583944 118,012 6/20/2018
3.1.0.561732-pre4 5,547 6/11/2018
3.1.0.550168-pre3 2,656 6/6/2018
3.1.0.530888-pre2 1,571 6/4/2018
3.1.0.469394-pre1 10,620 5/9/2018
3.0.0.561731 129,899 6/11/2018
3.0.0.550146 24,250 6/6/2018
3.0.0.530893 18,331 6/4/2018
3.0.0.482510 194,239 5/14/2018
3.0.0.446417 107,896 5/1/2018
3.0.0.427558-pre4 8,195 4/25/2018
3.0.0.354232-pre3 12,894 4/5/2018
3.0.0.296286-pre2 7,806 3/20/2018
2.5.1.527436 67,361 5/4/2018
2.5.1.444934 143,204 4/4/2018
2.5.1.392594-pre3 3,937 3/21/2018
2.5.1.340284-pre2 5,627 3/9/2018
2.5.1.317207-pre1 5,397 3/1/2018
2.5.0.280555 288,185 2/16/2018
2.5.0.122203 292,777 12/18/2017
2.5.0.121934 186,139 11/28/2017
2.5.0.91635 121,595 11/16/2017
2.5.0.77107 27,109 11/13/2017
2.5.0.75255-pre3 5,164 11/10/2017
2.5.0.19271-pre2 8,740 10/20/2017
2.4.0.91020 41,700 11/16/2017
2.4.0.74863 33,193 11/10/2017
2.4.0.38779 57,379 10/30/2017
2.4.0.18342 52,994 10/20/2017
2.4.0.282 152,967 9/29/2017
2.4.0.280 173,706 9/27/2017
2.4.0.275-pre3 7,794 9/19/2017
2.4.0.269-pre2 13,224 8/29/2017
2.4.0.266-pre1 18,315 8/16/2017
2.3.5.256-pre6 33,467 6/29/2017
2.3.5.255-pre5 4,638 6/26/2017
2.3.5.239-pre3 27,137 5/11/2017
2.3.5.235-pre2 10,955 4/26/2017
2.3.5.233-pre1 8,790 4/13/2017
2.3.4.270 128,077 8/29/2017
2.3.4.267 62,766 8/16/2017
2.3.4.247 378,288 5/16/2017
2.3.4.231 200,247 4/12/2017
2.3.4.224 239,988 3/29/2017
2.3.4.221-pre6 7,117 3/27/2017
2.3.4.214-pre5 10,000 3/14/2017
2.3.4.212-pre4 5,987 3/10/2017
2.3.4.211-pre3 3,830 3/9/2017
2.3.4.192-pre2 18,889 2/3/2017
2.3.4.184-pre1 12,230 1/13/2017
2.3.3.193 231,939 2/1/2017
2.3.3.180 203,732 1/5/2017
2.3.3.175 115,911 12/6/2016
2.3.3.168 64,605 11/23/2016
2.3.3.166-pre4 7,595 11/3/2016
2.3.3.163-pre3 6,205 10/17/2016
2.3.3.152-pre2 15,401 9/15/2016
2.3.2.127 259,376 9/14/2016
2.3.2.118-pre1 6,649 8/3/2016
2.3.1.114 153,142 8/3/2016
2.3.1.113-pre3 3,666 7/19/2016
2.3.1.111-pre2 4,619 7/4/2016
2.3.1.110-pre1 2,303 6/29/2016
2.3.0.107 194,510 6/29/2016
2.3.0.49 83,751 6/16/2016
2.3.0.46-pre3 15,585 5/30/2016
2.3.0.38-pre2 12,797 4/27/2016
2.3.0.34-pre1 8,474 4/27/2016
2.2.0.45 116,380 5/30/2016
2.2.0.31 125,617 4/27/2016
2.2.0.23-pre4 2,949 4/20/2016
2.2.0.18-pre3 2,162 4/20/2016
2.2.0.5-pre2 15,830 4/8/2016
2.2.0.4-pre1 18,371 4/5/2016
2.1.0.6529 96,305 3/13/2016
2.1.0.6526 17,113 3/9/2016
2.1.0.6524 32,508 3/2/2016
2.1.0.6521 11,685 3/1/2016
2.1.0.6517-pre5 1,945 2/18/2016
2.1.0.6513-pre4 1,925 2/9/2016
2.1.0.6508-pre3 2,246 1/28/2016
2.1.0.6503-pre2 6,831 1/22/2016
2.1.0.6501-pre1 1,392 1/21/2016
2.1.0.6500-pre1 1,214 1/20/2016
2.0.1.6505 91,579 1/28/2016
2.0.1.6495 74,128 1/20/2016
2.0.1.6492-pre1 3,679 12/3/2015
2.0.0.6490 95,185 12/1/2015
2.0.0.6484 17,535 11/21/2015
2.0.0.6482 233,335 11/17/2015
1.5.2.6478-pre3 1,107 11/17/2015
1.5.2.6477-pre2 3,689 11/10/2015
1.5.2.6469-pre1 2,009 10/20/2015
1.5.1.6471 75,048 10/20/2015
1.5.1.6468 3,709 10/20/2015
1.5.1.6460-pre2 1,487 10/13/2015
1.5.1.6455-pre1 2,826 10/2/2015
1.5.0.6447 51,892 9/25/2015
1.5.0.6446 21,164 9/16/2015
1.5.0.6404-pre3 3,128 8/25/2015
1.5.0.6401-pre2 1,338 8/21/2015
1.5.0.6396-pre1 1,795 8/5/2015
1.4.4.6449 2,515 9/25/2015
1.4.4.6443 1,480 9/16/2015
1.4.4.6392 75,300 7/29/2015
1.4.4.6391 1,849 7/28/2015
1.4.4.6387 2,787 7/27/2015
1.4.4.6379-pre3 1,376 7/20/2015
1.4.4.6378-pre2 1,203 7/16/2015
1.4.4.6377-pre1 1,193 7/14/2015
1.4.3.6376 40,602 7/9/2015
1.4.3.6374 16,301 7/1/2015
1.4.3.6372 1,904 6/30/2015
1.4.3.6364-pre3 2,158 6/16/2015
1.4.3.6358-pre2 5,585 4/24/2015
1.4.3.6356-pre1 1,301 4/21/2015
1.4.2.6359 59,995 4/30/2015
1.4.2.6355 13,972 4/21/2015
1.4.2.6353-pre2 2,337 3/31/2015
1.4.2.6350-pre1 1,404 3/30/2015
1.4.1.6349 43,956 3/30/2015
1.4.1.6347-pre2 3,084 3/19/2015
1.4.1.6342-pre1 1,542 3/10/2015
1.4.0.6341 28,393 3/9/2015
1.4.0.6340-pre2 2,350 3/6/2015
1.4.0.6336-pre1 1,374 3/3/2015
1.3.5.6337 4,936 3/5/2015
1.3.5.6335 23,435 3/2/2015
1.3.5.6333-pre1 1,935 2/17/2015
1.3.4.6332 18,156 2/17/2015
1.3.4.6331-pre4 1,386 2/13/2015
1.3.4.6329-pre3 1,129 2/12/2015
1.3.4.6328-pre2 1,133 2/11/2015
1.3.4.6325-pre1 1,099 2/9/2015
1.3.3.6323 51,658 2/9/2015
1.3.3.6322-pre3 1,090 2/6/2015
1.3.3.6321-pre2 1,245 2/4/2015
1.3.3.6318-pre1 1,252 2/2/2015
1.3.2.6316 7,496 2/3/2015
1.3.2.6313-pre3 1,230 1/30/2015
1.3.2.6309-pre2 1,278 1/28/2015
1.3.2.6299-pre1 1,987 1/20/2015
1.3.1.6296 54,179 1/4/2015
1.3.1.6294-pre1 4,258 12/24/2014
1.3.0.6292 9,365 12/24/2014
1.3.0.6286-pre4 1,990 12/19/2014
1.3.0.6284-pre3 1,492 12/12/2014
1.3.0.6280-pre2 1,442 12/9/2014
1.3.0.6275-pre1 7,720 11/12/2014
1.2.3.6257 38,186 10/2/2014
1.2.3.6256-pre4 2,134 9/26/2014
1.2.3.6255-pre3 2,528 9/20/2014
1.2.3.6249-pre2 1,704 9/9/2014
1.2.3.6246-pre1 4,230 8/15/2014
1.2.2.6243 28,144 7/30/2014
1.2.2.6241-pre3 2,636 7/28/2014
1.2.2.6240-pre2 4,472 7/22/2014
1.2.2.6238-pre1 3,593 7/17/2014
1.2.1.6229 8,275 7/14/2014
1.1.1.6206 14,052 6/19/2014
1.1.0.6201 13,154 6/12/2014
1.0.6197 4,027 6/4/2014
1.0.6188 11,475 5/28/2014
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