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 prerelease 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
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

Version History

Version Downloads Last updated
2.5.0.122203 22,944 12/18/2017
2.5.0.121934 77,367 11/28/2017
2.5.0.91635 59,810 11/16/2017
2.5.0.77107 10,952 11/13/2017
2.5.0.75255-pre3 1,827 11/10/2017
2.5.0.19271-pre2 4,866 10/20/2017
2.4.0.91020 9,142 11/16/2017
2.4.0.74863 19,662 11/10/2017
2.4.0.38779 38,117 10/30/2017
2.4.0.18342 33,834 10/20/2017
2.4.0.282 97,809 9/29/2017
2.4.0.280 66,759 9/27/2017
2.4.0.275-pre3 4,323 9/19/2017
2.4.0.269-pre2 9,391 8/29/2017
2.4.0.266-pre1 8,413 8/16/2017
2.3.5.256-pre6 22,521 6/29/2017
2.3.5.255-pre5 1,865 6/26/2017
2.3.5.239-pre3 21,371 5/11/2017
2.3.5.235-pre2 7,717 4/26/2017
2.3.5.233-pre1 5,525 4/13/2017
2.3.4.270 79,261 8/29/2017
2.3.4.267 46,468 8/16/2017
2.3.4.247 282,598 5/16/2017
2.3.4.231 159,227 4/12/2017
2.3.4.224 202,617 3/29/2017
2.3.4.221-pre6 4,513 3/27/2017
2.3.4.214-pre5 7,367 3/14/2017
2.3.4.212-pre4 3,350 3/10/2017
2.3.4.211-pre3 1,161 3/9/2017
2.3.4.192-pre2 15,066 2/3/2017
2.3.4.184-pre1 8,060 1/13/2017
2.3.3.193 185,715 2/1/2017
2.3.3.180 179,965 1/5/2017
2.3.3.175 106,811 12/6/2016
2.3.3.168 58,335 11/23/2016
2.3.3.166-pre4 5,970 11/3/2016
2.3.3.163-pre3 5,387 10/17/2016
2.3.3.152-pre2 12,557 9/15/2016
2.3.2.127 227,241 9/14/2016
2.3.2.118-pre1 5,932 8/3/2016
2.3.1.114 138,542 8/3/2016
2.3.1.113-pre3 2,857 7/19/2016
2.3.1.111-pre2 3,909 7/4/2016
2.3.1.110-pre1 1,583 6/29/2016
2.3.0.107 177,178 6/29/2016
2.3.0.49 66,654 6/16/2016
2.3.0.46-pre3 12,889 5/30/2016
2.3.0.38-pre2 11,136 4/27/2016
2.3.0.34-pre1 7,211 4/27/2016
2.2.0.45 98,186 5/30/2016
2.2.0.31 115,466 4/27/2016
2.2.0.23-pre4 2,266 4/20/2016
2.2.0.18-pre3 1,465 4/20/2016
2.2.0.5-pre2 15,112 4/8/2016
2.2.0.4-pre1 17,622 4/5/2016
2.1.0.6529 87,304 3/13/2016
2.1.0.6526 15,480 3/9/2016
2.1.0.6524 25,029 3/2/2016
2.1.0.6521 9,351 3/1/2016
2.1.0.6517-pre5 1,188 2/18/2016
2.1.0.6513-pre4 1,133 2/9/2016
2.1.0.6508-pre3 1,426 1/28/2016
2.1.0.6503-pre2 6,012 1/22/2016
2.1.0.6501-pre1 578 1/21/2016
2.1.0.6500-pre1 419 1/20/2016
2.0.1.6505 84,305 1/28/2016
2.0.1.6495 68,190 1/20/2016
2.0.1.6492-pre1 2,911 12/3/2015
2.0.0.6490 85,643 12/1/2015
2.0.0.6484 16,305 11/21/2015
2.0.0.6482 210,581 11/17/2015
1.5.2.6478-pre3 377 11/17/2015
1.5.2.6477-pre2 2,669 11/10/2015
1.5.2.6469-pre1 (current version) 1,159 10/20/2015
1.5.1.6471 69,133 10/20/2015
1.5.1.6468 2,757 10/20/2015
1.5.1.6460-pre2 636 10/13/2015
1.5.1.6455-pre1 1,815 10/2/2015
1.5.0.6447 42,957 9/25/2015
1.5.0.6446 19,091 9/16/2015
1.5.0.6404-pre3 2,289 8/25/2015
1.5.0.6401-pre2 468 8/21/2015
1.5.0.6396-pre1 1,062 8/5/2015
1.4.4.6449 1,570 9/25/2015
1.4.4.6443 663 9/16/2015
1.4.4.6392 65,139 7/29/2015
1.4.4.6391 1,111 7/28/2015
1.4.4.6387 2,023 7/27/2015
1.4.4.6379-pre3 635 7/20/2015
1.4.4.6378-pre2 472 7/16/2015
1.4.4.6377-pre1 435 7/14/2015
1.4.3.6376 33,257 7/9/2015
1.4.3.6374 14,430 7/1/2015
1.4.3.6372 1,166 6/30/2015
1.4.3.6364-pre3 1,368 6/16/2015
1.4.3.6358-pre2 4,640 4/24/2015
1.4.3.6356-pre1 516 4/21/2015
1.4.2.6359 49,672 4/30/2015
1.4.2.6355 11,982 4/21/2015
1.4.2.6353-pre2 1,560 3/31/2015
1.4.2.6350-pre1 648 3/30/2015
1.4.1.6349 40,429 3/30/2015
1.4.1.6347-pre2 2,364 3/19/2015
1.4.1.6342-pre1 801 3/10/2015
1.4.0.6341 26,373 3/9/2015
1.4.0.6340-pre2 1,372 3/6/2015
1.4.0.6336-pre1 680 3/3/2015
1.3.5.6337 4,124 3/5/2015
1.3.5.6335 18,680 3/2/2015
1.3.5.6333-pre1 1,049 2/17/2015
1.3.4.6332 15,465 2/17/2015
1.3.4.6331-pre4 617 2/13/2015
1.3.4.6329-pre3 401 2/12/2015
1.3.4.6328-pre2 439 2/11/2015
1.3.4.6325-pre1 411 2/9/2015
1.3.3.6323 45,003 2/9/2015
1.3.3.6322-pre3 372 2/6/2015
1.3.3.6321-pre2 536 2/4/2015
1.3.3.6318-pre1 495 2/2/2015
1.3.2.6316 6,363 2/3/2015
1.3.2.6313-pre3 469 1/30/2015
1.3.2.6309-pre2 526 1/28/2015
1.3.2.6299-pre1 1,236 1/20/2015
1.3.1.6296 47,452 1/4/2015
1.3.1.6294-pre1 3,348 12/24/2014
1.3.0.6292 8,204 12/24/2014
1.3.0.6286-pre4 1,279 12/19/2014
1.3.0.6284-pre3 805 12/12/2014
1.3.0.6280-pre2 712 12/9/2014
1.3.0.6275-pre1 6,955 11/12/2014
1.2.3.6257 34,867 10/2/2014
1.2.3.6256-pre4 1,403 9/26/2014
1.2.3.6255-pre3 1,769 9/20/2014
1.2.3.6249-pre2 1,001 9/9/2014
1.2.3.6246-pre1 3,354 8/15/2014
1.2.2.6243 25,424 7/30/2014
1.2.2.6241-pre3 1,899 7/28/2014
1.2.2.6240-pre2 3,680 7/22/2014
1.2.2.6238-pre1 2,720 7/17/2014
1.2.1.6229 7,034 7/14/2014
1.1.1.6206 13,240 6/19/2014
1.1.0.6201 11,449 6/12/2014
1.0.6197 3,099 6/4/2014
1.0.6188 10,170 5/28/2014
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