Xamarin.Forms 1.5.2.6469-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There is a newer version of this package available.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 1.5.2.6469-pre1
dotnet add package Xamarin.Forms --version 1.5.2.6469-pre1
<PackageReference Include="Xamarin.Forms" Version="1.5.2.6469-pre1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Xamarin.Forms --version 1.5.2.6469-pre1
The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Release Notes

## Important Notes ##

This release is more alpha than most pre-releases. We want to get as much testing on the new optimization work as possible. Expect to see changes and more work landing into this release before promotion to stable.

## Enhancements ##

### New properties ###

These all do pretty much what you expect

- Editor.TextColor
- Entry.TextColor
- Editor.FontSize
- Editor.FontAttributes
- Editor.FontFamily

### New API ###

```csharp
public enum ListViewCachingStrategy
{
RetainElement = 0,
RecycleElement,
}
```

This new `enum` is used in conjuction with a new constructor for ListView, `ListView (ListViewCachingStrategy cachingStrategy)`. The default mode, RetainElement represents the old ListView behavior. It is also the default behavior if the old constructor is retained. The new behavior has the following characteristics.

- Only works on Android/iOS. Windows will simply get the old behavior no matter what.
- DataTemplate will be inflated to match as many native renderers for the cells are created.
- During virtualization, the Cell will have its binding context updated.

This means if an App opt into the new mode, the app must appropriately handle BindingContext updates. All data about the cell must come from the binding context or consistency errors may occur. If the cells are using custom renderers, it must ensure they properly implement property change notification. This mode is not always a pure performance win, testing is the only way to know for sure, however there are some basic guidelines:

 - Use RecycleElement if:
   - Cell BindingContext defines all properties/data about the View
   - Cells are largely similar and do not morphe dramatically based on BindingContext
   - The Cell has a moderate to small number of bindings
   - The Cell adheres well to the new performance guidelines below
 - Use RetainElement if:
   - Cells morph frequently
   - Cells have large numbers of bindings (20 to 30 tends to be the crossover point)
   - When testing RecycleElement, it is slower

Generally speaking, prefer RecycleElement as it can offer significant performance gains when in the fast path scenario. Eventually RetainElement may be phased out, however this will only happen once RetainElement no longer offers any performance advantage in any scenario.

### Layout Optimization ###

There is a new experimental layout optimization in this release of Xamarin.Forms. The optimization is complex and currently only impacts layout updates. Effectively the optimization serves to block InvalidateMeasure call chains. To get the best possible performance follow these performance guidelines:

- Leave the View.VerticalOptions and View.HorizontalOptions alone as much as possible. The default value of Fill or FillAndExpand allows for the best layout optimization.
- When using a StackLayout, make sure to have only one child set to Expand.
- Avoid RelativeLayout when possible.
- When using Grid, avoid Auto rows/columns if possible. Fixed row/cols are best. Stars are equally good if parent tree follows guidelines.
- When using AbsoluteLayout, avoid using AutoSize if possible.
- When using Labels, set the LineBreakMode to NoWrap whenever possible.

This optimization may impact the layout of your app. If you experience any differences at all, please report them as bugs. Further the optimization will work with the new ListView caching strategy, effectively doubling down on scrolling performance.

## Bug Fixes ##

[Bug 34632](https://bugzilla.xamarin.com/show_bug.cgi?id=34632) - Can't change IsPresented when setting SplitOnLandscape
[Bug 34556](https://bugzilla.xamarin.com/show_bug.cgi?id=34556) - Minimum version determination methods on iOS will fail once iOS hits version 10
[Bug 34549](https://bugzilla.xamarin.com/show_bug.cgi?id=34549) - Setting a BindableProperty of Type DateTime? to null raises Error
[Bug 34235](https://bugzilla.xamarin.com/show_bug.cgi?id=34235) - Xamarin.Forms.Platform.WinRT.TabbedPageRenderer OnElementChanged not virtual
[Bug 34061](https://bugzilla.xamarin.com/show_bug.cgi?id=34061) - RelativeLayout - First child added after page display does not appear
[Bug 34007](https://bugzilla.xamarin.com/show_bug.cgi?id=34007) - Z order drawing of children views are different on Android and iOS
[Bug 33764](https://bugzilla.xamarin.com/show_bug.cgi?id=33764) - Frame outline colour doesn't change using ViewModel
[Bug 33612](https://bugzilla.xamarin.com/show_bug.cgi?id=33612) - Removing a page from the navigation stack causes an 'Object reference' exception in Android only
[Bug 33499](https://bugzilla.xamarin.com/show_bug.cgi?id=33499) - Android WebViewRenderer doesn't unhook events properly
[Bug 32902](https://bugzilla.xamarin.com/show_bug.cgi?id=32902) - [iOS | iPad] App Crashes (without debug log) when Master Detail isPresented and navigation being popped
[Bug 32801](https://bugzilla.xamarin.com/show_bug.cgi?id=32801) - Memory Leak in TabbedPage + NavigationPage
[Bug 32447](https://bugzilla.xamarin.com/show_bug.cgi?id=32447) - [iOS] App crash when scrolling quickly through a TableView that has Pickers in the cells.
[Bug 32040](https://bugzilla.xamarin.com/show_bug.cgi?id=32040) - EntryCell.Tapped or SwitchCell.Tapped does not fire when within a TableView
[Bug 31366](https://bugzilla.xamarin.com/show_bug.cgi?id=31366) - Pushing and then popping a page modally cause ArgumentOutOfRangeException
[Bug 29257](https://bugzilla.xamarin.com/show_bug.cgi?id=29257) - CarouselPage.CurrentPage Does Not Work Properly When Used Inside a NavigationPage

## Other Fixes ##

- [A] Non-AppCompat backend no longer fails to redraw Frame correctly
- OnPlatform now passing the Windows value to WinRT projects. This API is being considered for replacement with something more extensible.
- OpenGLView now uses IOpenGLViewController for backend communication

Showing the top 10 GitHub repositories that depend on Xamarin.Forms:

Repository Stars
dotnet-architecture/eShopOnContainers
Easy to get started sample reference microservice and container based application. Cross-platform on Linux and Windows Docker Containers, powered by .NET Core 2.2, Docker engine and optionally Azure, Kubernetes or Service Fabric. Supports Visual Studio, VS for Mac and CLI based environments with Docker CLI, dotnet CLI, VS Code or any other code editor.
microsoft/ailab
Experience, Learn and Code the latest breakthrough innovations with Microsoft AI
reactiveui/ReactiveUI
An advanced, composable, functional reactive model-view-viewmodel framework for all .NET platforms that is inspired by functional reactive programming. ReactiveUI allows you to abstract mutable state away from your user interfaces, express the idea around a feature in one readable place and improve the testability of your application.
PrismLibrary/Prism
Prism is a framework for building loosely coupled, maintainable, and testable XAML applications in WPF, Windows 10 UWP, and Xamarin Forms.
MvvmCross/MvvmCross
The .NET MVVM framework for cross-platform solutions, including Xamarin.iOS, Xamarin.Android, Windows and Mac.
xamarin/xamarin-forms-samples
Sample apps built using the Xamarin.Forms framework
mono/monodevelop
MonoDevelop is a cross platform .NET IDE
Caliburn-Micro/Caliburn.Micro
A small, yet powerful framework, designed for building applications across all XAML platforms. Its strong support for MV* patterns will enable you to build your solution quickly, without the need to sacrifice code quality or testability.
reactiveui/Akavache
An asynchronous, persistent key-value store created for writing desktop and mobile applications, based on SQLite3. Akavache is great for both storing important data as well as cached local data that expires.
xamarin/XamarinComponents
Plugins for Xamarin

Version History

Version Downloads Last updated
4.3.0.819712-pre2 680 9/19/2019
4.3.0.778476-pre1 3,047 9/11/2019
4.2.0.815419 4,583 9/19/2019
4.2.0.778463 22,401 9/11/2019
4.2.0.709249 65,517 8/21/2019
4.2.0.673161-pre3 6,131 8/7/2019
4.2.0.618605-pre2 7,207 7/24/2019
4.2.0.608146-pre1 3,387 7/16/2019
4.1.0.778454 1,506 9/11/2019
4.1.0.709244 8,996 8/21/2019
4.1.0.673156 61,272 8/7/2019
4.1.0.618606 64,243 7/24/2019
4.1.0.581479 78,396 7/9/2019
4.1.0.555618 129,953 6/28/2019
4.1.0.496342-pre2 6,704 6/13/2019
4.1.0.483098-pre1 4,600 6/5/2019
4.0.0.709238 917 8/21/2019
4.0.0.618610 1,709 7/24/2019
4.0.0.540366 28,637 6/27/2019
4.0.0.497661 60,406 6/13/2019
4.0.0.482894 47,211 6/3/2019
4.0.0.425677 167,919 5/14/2019
4.0.0.394984-pre10 9,286 5/3/2019
4.0.0.346134-pre9 15,213 4/18/2019
4.0.0.304370-pre8 10,384 4/3/2019
4.0.0.250467-pre7 7,467 3/20/2019
4.0.0.232914-pre6 7,726 3/14/2019
4.0.0.169046-pre5 5,924 2/21/2019
4.0.0.135214-pre4 4,677 2/6/2019
4.0.0.94569-pre3 4,291 1/24/2019
4.0.0.62955-pre2 13,310 1/10/2019
4.0.0.8055-pre1 13,681 12/4/2018
3.6.0.709228 2,661 8/21/2019
3.6.0.539721 19,216 6/27/2019
3.6.0.344457 152,271 4/18/2019
3.6.0.293080 92,155 4/3/2019
3.6.0.264807 158,985 3/19/2019
3.6.0.220655 102,889 3/6/2019
3.6.0.169048-pre2 536 2/21/2019
3.6.0.135200-pre1 4,790 2/6/2019
3.5.0.274416 14,952 3/26/2019
3.5.0.169047 88,796 2/20/2019
3.5.0.129452 126,827 2/6/2019
3.5.0.94564-pre3 1,115 1/24/2019
3.5.0.62956-pre2 1,032 1/10/2019
3.4.0.1039999 11,638 3/26/2019
3.4.0.1029999 89,184 1/24/2019
3.4.0.1009999 105,024 1/4/2019
3.4.0.1008975 446,458 11/15/2018
3.4.0.987044-pre2 2,347 11/8/2018
3.4.0.925479-pre1 10,853 10/18/2018
3.3.0.967583 166,774 11/1/2018
3.3.0.912540 120,119 10/18/2018
3.3.0.893527-pre3 7,737 10/11/2018
3.3.0.871608-pre2 11,997 10/1/2018
3.3.0.840541-pre1 6,076 9/20/2018
3.2.0.871581 113,472 10/3/2018
3.2.0.839982 158,881 9/17/2018
3.2.0.809874-pre3 3,789 9/10/2018
3.2.0.729530-pre2 12,801 8/14/2018
3.2.0.637442-pre1 10,556 7/17/2018
3.1.0.697729 351,450 8/1/2018
3.1.0.637273 106,764 7/11/2018
3.1.0.583944 146,031 6/20/2018
3.1.0.561732-pre4 6,344 6/11/2018
3.1.0.550168-pre3 3,097 6/6/2018
3.1.0.530888-pre2 1,918 6/4/2018
3.1.0.469394-pre1 11,433 5/9/2018
3.0.0.561731 146,004 6/11/2018
3.0.0.550146 27,912 6/6/2018
3.0.0.530893 21,445 6/4/2018
3.0.0.482510 248,222 5/14/2018
3.0.0.446417 135,111 5/1/2018
3.0.0.427558-pre4 9,266 4/25/2018
3.0.0.354232-pre3 14,201 4/5/2018
3.0.0.296286-pre2 8,393 3/20/2018
2.5.1.527436 92,448 5/4/2018
2.5.1.444934 170,387 4/4/2018
2.5.1.392594-pre3 4,286 3/21/2018
2.5.1.340284-pre2 6,469 3/9/2018
2.5.1.317207-pre1 5,784 3/1/2018
2.5.0.280555 325,417 2/16/2018
2.5.0.122203 336,192 12/18/2017
2.5.0.121934 218,726 11/28/2017
2.5.0.91635 161,355 11/16/2017
2.5.0.77107 30,526 11/13/2017
2.5.0.75255-pre3 5,549 11/10/2017
2.5.0.19271-pre2 9,530 10/20/2017
2.4.0.91020 49,551 11/16/2017
2.4.0.74863 35,114 11/10/2017
2.4.0.38779 61,853 10/30/2017
2.4.0.18342 56,051 10/20/2017
2.4.0.282 164,011 9/29/2017
2.4.0.280 203,924 9/27/2017
2.4.0.275-pre3 8,229 9/19/2017
2.4.0.269-pre2 13,833 8/29/2017
2.4.0.266-pre1 19,854 8/16/2017
2.3.5.256-pre6 36,097 6/29/2017
2.3.5.255-pre5 5,035 6/26/2017
2.3.5.239-pre3 28,254 5/11/2017
2.3.5.235-pre2 11,420 4/26/2017
2.3.5.233-pre1 9,288 4/13/2017
2.3.4.270 148,888 8/29/2017
2.3.4.267 68,254 8/16/2017
2.3.4.247 422,219 5/16/2017
2.3.4.231 211,823 4/12/2017
2.3.4.224 251,066 3/29/2017
2.3.4.221-pre6 7,559 3/27/2017
2.3.4.214-pre5 10,451 3/14/2017
2.3.4.212-pre4 6,390 3/10/2017
2.3.4.211-pre3 4,212 3/9/2017
2.3.4.192-pre2 19,580 2/3/2017
2.3.4.184-pre1 13,115 1/13/2017
2.3.3.193 247,712 2/1/2017
2.3.3.180 211,559 1/5/2017
2.3.3.175 118,593 12/6/2016
2.3.3.168 67,028 11/23/2016
2.3.3.166-pre4 8,182 11/3/2016
2.3.3.163-pre3 6,523 10/17/2016
2.3.3.152-pre2 16,218 9/15/2016
2.3.2.127 287,634 9/14/2016
2.3.2.118-pre1 6,947 8/3/2016
2.3.1.114 156,650 8/3/2016
2.3.1.113-pre3 3,950 7/19/2016
2.3.1.111-pre2 4,886 7/4/2016
2.3.1.110-pre1 2,598 6/29/2016
2.3.0.107 207,563 6/29/2016
2.3.0.49 88,607 6/16/2016
2.3.0.46-pre3 16,278 5/30/2016
2.3.0.38-pre2 13,336 4/27/2016
2.3.0.34-pre1 8,918 4/27/2016
2.2.0.45 137,810 5/30/2016
2.2.0.31 128,332 4/27/2016
2.2.0.23-pre4 3,230 4/20/2016
2.2.0.18-pre3 2,443 4/20/2016
2.2.0.5-pre2 16,136 4/8/2016
2.2.0.4-pre1 18,646 4/5/2016
2.1.0.6529 98,897 3/13/2016
2.1.0.6526 17,727 3/9/2016
2.1.0.6524 36,765 3/2/2016
2.1.0.6521 12,263 3/1/2016
2.1.0.6517-pre5 2,319 2/18/2016
2.1.0.6513-pre4 2,300 2/9/2016
2.1.0.6508-pre3 2,614 1/28/2016
2.1.0.6503-pre2 7,204 1/22/2016
2.1.0.6501-pre1 1,759 1/21/2016
2.1.0.6500-pre1 1,584 1/20/2016
2.0.1.6505 93,652 1/28/2016
2.0.1.6495 75,360 1/20/2016
2.0.1.6492-pre1 4,041 12/3/2015
2.0.0.6490 98,148 12/1/2015
2.0.0.6484 17,999 11/21/2015
2.0.0.6482 241,816 11/17/2015
1.5.2.6478-pre3 1,462 11/17/2015
1.5.2.6477-pre2 4,100 11/10/2015
1.5.2.6469-pre1 2,383 10/20/2015
1.5.1.6471 77,158 10/20/2015
1.5.1.6468 4,105 10/20/2015
1.5.1.6460-pre2 1,852 10/13/2015
1.5.1.6455-pre1 3,211 10/2/2015
1.5.0.6447 55,833 9/25/2015
1.5.0.6446 21,927 9/16/2015
1.5.0.6404-pre3 3,502 8/25/2015
1.5.0.6401-pre2 1,704 8/21/2015
1.5.0.6396-pre1 2,145 8/5/2015
1.4.4.6449 2,946 9/25/2015
1.4.4.6443 1,846 9/16/2015
1.4.4.6392 77,529 7/29/2015
1.4.4.6391 2,201 7/28/2015
1.4.4.6387 3,137 7/27/2015
1.4.4.6379-pre3 1,726 7/20/2015
1.4.4.6378-pre2 1,549 7/16/2015
1.4.4.6377-pre1 1,551 7/14/2015
1.4.3.6376 42,912 7/9/2015
1.4.3.6374 16,843 7/1/2015
1.4.3.6372 2,276 6/30/2015
1.4.3.6364-pre3 2,526 6/16/2015
1.4.3.6358-pre2 5,965 4/24/2015
1.4.3.6356-pre1 1,635 4/21/2015
1.4.2.6359 63,142 4/30/2015
1.4.2.6355 14,630 4/21/2015
1.4.2.6353-pre2 2,688 3/31/2015
1.4.2.6350-pre1 1,744 3/30/2015
1.4.1.6349 44,776 3/30/2015
1.4.1.6347-pre2 3,425 3/19/2015
1.4.1.6342-pre1 1,879 3/10/2015
1.4.0.6341 29,214 3/9/2015
1.4.0.6340-pre2 2,726 3/6/2015
1.4.0.6336-pre1 1,712 3/3/2015
1.3.5.6337 5,309 3/5/2015
1.3.5.6335 25,497 3/2/2015
1.3.5.6333-pre1 2,288 2/17/2015
1.3.4.6332 19,463 2/17/2015
1.3.4.6331-pre4 1,744 2/13/2015
1.3.4.6329-pre3 1,468 2/12/2015
1.3.4.6328-pre2 1,476 2/11/2015
1.3.4.6325-pre1 1,443 2/9/2015
1.3.3.6323 53,416 2/9/2015
1.3.3.6322-pre3 1,437 2/6/2015
1.3.3.6321-pre2 1,601 2/4/2015
1.3.3.6318-pre1 1,601 2/2/2015
1.3.2.6316 7,948 2/3/2015
1.3.2.6313-pre3 1,584 1/30/2015
1.3.2.6309-pre2 1,630 1/28/2015
1.3.2.6299-pre1 2,343 1/20/2015
1.3.1.6296 57,217 1/4/2015
1.3.1.6294-pre1 4,665 12/24/2014
1.3.0.6292 9,817 12/24/2014
1.3.0.6286-pre4 2,345 12/19/2014
1.3.0.6284-pre3 1,846 12/12/2014
1.3.0.6280-pre2 1,797 12/9/2014
1.3.0.6275-pre1 8,073 11/12/2014
1.2.3.6257 39,408 10/2/2014
1.2.3.6256-pre4 2,481 9/26/2014
1.2.3.6255-pre3 2,891 9/20/2014
1.2.3.6249-pre2 2,069 9/9/2014
1.2.3.6246-pre1 4,637 8/15/2014
1.2.2.6243 28,981 7/30/2014
1.2.2.6241-pre3 2,996 7/28/2014
1.2.2.6240-pre2 4,835 7/22/2014
1.2.2.6238-pre1 3,996 7/17/2014
1.2.1.6229 8,797 7/14/2014
1.1.1.6206 14,451 6/19/2014
1.1.0.6201 13,848 6/12/2014
1.0.6197 4,422 6/4/2014
1.0.6188 12,003 5/28/2014
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