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There is a newer version of this package available.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
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
4.0.0.8055-pre1 2,955 12/4/2018
3.4.0.1008975 76,979 11/15/2018
3.4.0.987044-pre2 1,785 11/8/2018
3.4.0.925479-pre1 5,927 10/18/2018
3.3.0.967583 74,328 11/1/2018
3.3.0.912540 66,268 10/18/2018
3.3.0.893527-pre3 3,540 10/11/2018
3.3.0.871608-pre2 6,067 10/1/2018
3.3.0.840541-pre1 2,955 9/20/2018
3.2.0.871581 60,535 10/3/2018
3.2.0.839982 72,562 9/17/2018
3.2.0.809874-pre3 2,739 9/10/2018
3.2.0.729530-pre2 7,538 8/14/2018
3.2.0.637442-pre1 6,740 7/17/2018
3.1.0.697729 247,574 8/1/2018
3.1.0.637273 74,841 7/11/2018
3.1.0.583944 110,990 6/20/2018
3.1.0.561732-pre4 5,149 6/11/2018
3.1.0.550168-pre3 2,370 6/6/2018
3.1.0.530888-pre2 1,333 6/4/2018
3.1.0.469394-pre1 10,155 5/9/2018
3.0.0.561731 123,009 6/11/2018
3.0.0.550146 22,913 6/6/2018
3.0.0.530893 17,011 6/4/2018
3.0.0.482510 178,827 5/14/2018
3.0.0.446417 99,026 5/1/2018
3.0.0.427558-pre4 7,741 4/25/2018
3.0.0.354232-pre3 12,275 4/5/2018
3.0.0.296286-pre2 7,482 3/20/2018
2.5.1.527436 58,565 5/4/2018
2.5.1.444934 131,273 4/4/2018
2.5.1.392594-pre3 3,708 3/21/2018
2.5.1.340284-pre2 5,372 3/9/2018
2.5.1.317207-pre1 5,159 3/1/2018
2.5.0.280555 276,187 2/16/2018
2.5.0.122203 279,129 12/18/2017
2.5.0.121934 177,254 11/28/2017
2.5.0.91635 118,818 11/16/2017
2.5.0.77107 25,940 11/13/2017
2.5.0.75255-pre3 4,915 11/10/2017
2.5.0.19271-pre2 8,377 10/20/2017
2.4.0.91020 39,292 11/16/2017
2.4.0.74863 32,426 11/10/2017
2.4.0.38779 56,230 10/30/2017
2.4.0.18342 51,607 10/20/2017
2.4.0.282 149,519 9/29/2017
2.4.0.280 163,457 9/27/2017
2.4.0.275-pre3 7,558 9/19/2017
2.4.0.269-pre2 12,878 8/29/2017
2.4.0.266-pre1 17,643 8/16/2017
2.3.5.256-pre6 32,485 6/29/2017
2.3.5.255-pre5 4,419 6/26/2017
2.3.5.239-pre3 26,718 5/11/2017
2.3.5.235-pre2 10,700 4/26/2017
2.3.5.233-pre1 8,526 4/13/2017
2.3.4.270 123,232 8/29/2017
2.3.4.267 60,935 8/16/2017
2.3.4.247 370,339 5/16/2017
2.3.4.231 196,678 4/12/2017
2.3.4.224 235,933 3/29/2017
2.3.4.221-pre6 6,878 3/27/2017
2.3.4.214-pre5 9,728 3/14/2017
2.3.4.212-pre4 5,771 3/10/2017
2.3.4.211-pre3 3,607 3/9/2017
2.3.4.192-pre2 18,589 2/3/2017
2.3.4.184-pre1 11,824 1/13/2017
2.3.3.193 226,699 2/1/2017
2.3.3.180 201,394 1/5/2017
2.3.3.175 114,965 12/6/2016
2.3.3.168 63,899 11/23/2016
2.3.3.166-pre4 7,238 11/3/2016
2.3.3.163-pre3 6,064 10/17/2016
2.3.3.152-pre2 15,029 9/15/2016
2.3.2.127 257,084 9/14/2016
2.3.2.118-pre1 6,512 8/3/2016
2.3.1.114 151,916 8/3/2016
2.3.1.113-pre3 3,526 7/19/2016
2.3.1.111-pre2 4,490 7/4/2016
2.3.1.110-pre1 2,164 6/29/2016
2.3.0.107 193,526 6/29/2016
2.3.0.49 81,708 6/16/2016
2.3.0.46-pre3 15,265 5/30/2016
2.3.0.38-pre2 12,526 4/27/2016
2.3.0.34-pre1 8,252 4/27/2016
2.2.0.45 114,698 5/30/2016
2.2.0.31 124,669 4/27/2016
2.2.0.23-pre4 2,822 4/20/2016
2.2.0.18-pre3 2,017 4/20/2016
2.2.0.5-pre2 15,670 4/8/2016
2.2.0.4-pre1 18,203 4/5/2016
2.1.0.6529 95,125 3/13/2016
2.1.0.6526 16,796 3/9/2016
2.1.0.6524 29,776 3/2/2016
2.1.0.6521 11,351 3/1/2016
2.1.0.6517-pre5 1,711 2/18/2016
2.1.0.6513-pre4 1,698 2/9/2016
2.1.0.6508-pre3 2,000 1/28/2016
2.1.0.6503-pre2 6,592 1/22/2016
2.1.0.6501-pre1 1,130 1/21/2016
2.1.0.6500-pre1 982 1/20/2016
2.0.1.6505 90,808 1/28/2016
2.0.1.6495 73,592 1/20/2016
2.0.1.6492-pre1 3,414 12/3/2015
2.0.0.6490 94,283 12/1/2015
2.0.0.6484 17,271 11/21/2015
2.0.0.6482 230,804 11/17/2015
1.5.2.6478-pre3 837 11/17/2015
1.5.2.6477-pre2 3,412 11/10/2015
1.5.2.6469-pre1 1,760 10/20/2015
1.5.1.6471 74,193 10/20/2015
1.5.1.6468 3,440 10/20/2015
1.5.1.6460-pre2 1,216 10/13/2015
1.5.1.6455-pre1 2,528 10/2/2015
1.5.0.6447 50,483 9/25/2015
1.5.0.6446 20,788 9/16/2015
1.5.0.6404-pre3 2,891 8/25/2015
1.5.0.6401-pre2 1,035 8/21/2015
1.5.0.6396-pre1 1,559 8/5/2015
1.4.4.6449 2,272 9/25/2015
1.4.4.6443 1,244 9/16/2015
1.4.4.6392 74,418 7/29/2015
1.4.4.6391 1,618 7/28/2015
1.4.4.6387 2,517 7/27/2015
1.4.4.6379-pre3 1,115 7/20/2015
1.4.4.6378-pre2 949 7/16/2015
1.4.4.6377-pre1 932 7/14/2015
1.4.3.6376 39,778 7/9/2015
1.4.3.6374 15,992 7/1/2015
1.4.3.6372 1,667 6/30/2015
1.4.3.6364-pre3 1,895 6/16/2015
1.4.3.6358-pre2 5,323 4/24/2015
1.4.3.6356-pre1 996 4/21/2015
1.4.2.6359 58,816 4/30/2015
1.4.2.6355 13,647 4/21/2015
1.4.2.6353-pre2 2,087 3/31/2015
1.4.2.6350-pre1 1,178 3/30/2015
1.4.1.6349 43,491 3/30/2015
1.4.1.6347-pre2 2,854 3/19/2015
1.4.1.6342-pre1 1,272 3/10/2015
1.4.0.6341 27,965 3/9/2015
1.4.0.6340-pre2 2,062 3/6/2015
1.4.0.6336-pre1 1,150 3/3/2015
1.3.5.6337 4,703 3/5/2015
1.3.5.6335 22,705 3/2/2015
1.3.5.6333-pre1 1,541 2/17/2015
1.3.4.6332 17,651 2/17/2015
1.3.4.6331-pre4 1,085 2/13/2015
1.3.4.6329-pre3 877 2/12/2015
1.3.4.6328-pre2 898 2/11/2015
1.3.4.6325-pre1 877 2/9/2015
1.3.3.6323 50,922 2/9/2015
1.3.3.6322-pre3 831 2/6/2015
1.3.3.6321-pre2 1,006 2/4/2015
1.3.3.6318-pre1 966 2/2/2015
1.3.2.6316 7,181 2/3/2015
1.3.2.6313-pre3 938 1/30/2015
1.3.2.6309-pre2 992 1/28/2015
1.3.2.6299-pre1 1,707 1/20/2015
1.3.1.6296 53,134 1/4/2015
1.3.1.6294-pre1 3,986 12/24/2014
1.3.0.6292 9,033 12/24/2014
1.3.0.6286-pre4 1,762 12/19/2014
1.3.0.6284-pre3 1,271 12/12/2014
1.3.0.6280-pre2 1,183 12/9/2014
1.3.0.6275-pre1 7,450 11/12/2014
1.2.3.6257 37,567 10/2/2014
1.2.3.6256-pre4 1,887 9/26/2014
1.2.3.6255-pre3 2,273 9/20/2014
1.2.3.6249-pre2 1,466 9/9/2014
1.2.3.6246-pre1 3,980 8/15/2014
1.2.2.6243 27,715 7/30/2014
1.2.2.6241-pre3 2,402 7/28/2014
1.2.2.6240-pre2 4,232 7/22/2014
1.2.2.6238-pre1 3,338 7/17/2014
1.2.1.6229 7,964 7/14/2014
1.1.1.6206 13,809 6/19/2014
1.1.0.6201 12,802 6/12/2014
1.0.6197 3,789 6/4/2014
1.0.6188 11,179 5/28/2014
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