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There is a newer version of this package available.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

Version History

Version Downloads Last updated
4.0.0.394984-pre10 5,743 5/3/2019
4.0.0.346134-pre9 6,609 4/18/2019
4.0.0.304370-pre8 7,229 4/3/2019
4.0.0.250467-pre7 4,775 3/20/2019
4.0.0.232914-pre6 5,806 3/14/2019
4.0.0.169046-pre5 5,229 2/21/2019
4.0.0.135214-pre4 3,962 2/6/2019
4.0.0.94569-pre3 3,845 1/24/2019
4.0.0.62955-pre2 11,578 1/10/2019
4.0.0.8055-pre1 11,979 12/4/2018
3.6.0.344457 64,354 4/18/2019
3.6.0.293080 47,795 4/3/2019
3.6.0.264807 77,177 3/19/2019
3.6.0.220655 63,612 3/6/2019
3.6.0.169048-pre2 444 2/21/2019
3.6.0.135200-pre1 3,708 2/6/2019
3.5.0.274416 3,777 3/26/2019
3.5.0.169047 54,987 2/20/2019
3.5.0.129452 69,908 2/6/2019
3.5.0.94564-pre3 992 1/24/2019
3.5.0.62956-pre2 845 1/10/2019
3.4.0.1039999 3,134 3/26/2019
3.4.0.1029999 66,135 1/24/2019
3.4.0.1009999 78,703 1/4/2019
3.4.0.1008975 333,908 11/15/2018
3.4.0.987044-pre2 2,207 11/8/2018
3.4.0.925479-pre1 8,720 10/18/2018
3.3.0.967583 142,666 11/1/2018
3.3.0.912540 98,518 10/18/2018
3.3.0.893527-pre3 5,933 10/11/2018
3.3.0.871608-pre2 9,138 10/1/2018
3.3.0.840541-pre1 4,536 9/20/2018
3.2.0.871581 85,993 10/3/2018
3.2.0.839982 110,571 9/17/2018
3.2.0.809874-pre3 3,432 9/10/2018
3.2.0.729530-pre2 10,629 8/14/2018
3.2.0.637442-pre1 8,671 7/17/2018
3.1.0.697729 299,445 8/1/2018
3.1.0.637273 93,095 7/11/2018
3.1.0.583944 125,658 6/20/2018
3.1.0.561732-pre4 5,889 6/11/2018
3.1.0.550168-pre3 2,886 6/6/2018
3.1.0.530888-pre2 1,753 6/4/2018
3.1.0.469394-pre1 11,007 5/9/2018
3.0.0.561731 137,541 6/11/2018
3.0.0.550146 25,739 6/6/2018
3.0.0.530893 19,827 6/4/2018
3.0.0.482510 212,515 5/14/2018
3.0.0.446417 117,203 5/1/2018
3.0.0.427558-pre4 8,690 4/25/2018
3.0.0.354232-pre3 13,462 4/5/2018
3.0.0.296286-pre2 8,110 3/20/2018
2.5.1.527436 79,457 5/4/2018
2.5.1.444934 154,964 4/4/2018
2.5.1.392594-pre3 4,126 3/21/2018
2.5.1.340284-pre2 5,913 3/9/2018
2.5.1.317207-pre1 5,598 3/1/2018
2.5.0.280555 305,559 2/16/2018
2.5.0.122203 310,336 12/18/2017
2.5.0.121934 199,813 11/28/2017
2.5.0.91635 127,958 11/16/2017
2.5.0.77107 28,367 11/13/2017
2.5.0.75255-pre3 5,370 11/10/2017
2.5.0.19271-pre2 9,151 10/20/2017
2.4.0.91020 44,474 11/16/2017
2.4.0.74863 34,052 11/10/2017
2.4.0.38779 58,895 10/30/2017
2.4.0.18342 54,538 10/20/2017
2.4.0.282 157,224 9/29/2017
2.4.0.280 187,632 9/27/2017
2.4.0.275-pre3 8,019 9/19/2017
2.4.0.269-pre2 13,536 8/29/2017
2.4.0.266-pre1 19,081 8/16/2017
2.3.5.256-pre6 34,759 6/29/2017
2.3.5.255-pre5 4,816 6/26/2017
2.3.5.239-pre3 27,647 5/11/2017
2.3.5.235-pre2 11,195 4/26/2017
2.3.5.233-pre1 9,042 4/13/2017
2.3.4.270 133,860 8/29/2017
2.3.4.267 65,366 8/16/2017
2.3.4.247 390,476 5/16/2017
2.3.4.231 204,492 4/12/2017
2.3.4.224 244,988 3/29/2017
2.3.4.221-pre6 7,336 3/27/2017
2.3.4.214-pre5 10,228 3/14/2017
2.3.4.212-pre4 6,178 3/10/2017
2.3.4.211-pre3 4,020 3/9/2017
2.3.4.192-pre2 19,229 2/3/2017
2.3.4.184-pre1 12,678 1/13/2017
2.3.3.193 239,492 2/1/2017
2.3.3.180 206,742 1/5/2017
2.3.3.175 117,099 12/6/2016
2.3.3.168 65,787 11/23/2016
2.3.3.166-pre4 7,854 11/3/2016
2.3.3.163-pre3 6,379 10/17/2016
2.3.3.152-pre2 15,793 9/15/2016
2.3.2.127 263,739 9/14/2016
2.3.2.118-pre1 6,795 8/3/2016
2.3.1.114 154,712 8/3/2016
2.3.1.113-pre3 3,812 7/19/2016
2.3.1.111-pre2 4,761 7/4/2016
2.3.1.110-pre1 2,452 6/29/2016
2.3.0.107 196,585 6/29/2016
2.3.0.49 85,896 6/16/2016
2.3.0.46-pre3 15,943 5/30/2016
2.3.0.38-pre2 13,068 4/27/2016
2.3.0.34-pre1 8,688 4/27/2016
2.2.0.45 120,129 5/30/2016
2.2.0.31 126,834 4/27/2016
2.2.0.23-pre4 3,088 4/20/2016
2.2.0.18-pre3 2,301 4/20/2016
2.2.0.5-pre2 15,977 4/8/2016
2.2.0.4-pre1 18,515 4/5/2016
2.1.0.6529 97,562 3/13/2016
2.1.0.6526 17,427 3/9/2016
2.1.0.6524 35,977 3/2/2016
2.1.0.6521 11,994 3/1/2016
2.1.0.6517-pre5 2,139 2/18/2016
2.1.0.6513-pre4 2,118 2/9/2016
2.1.0.6508-pre3 2,442 1/28/2016
2.1.0.6503-pre2 7,028 1/22/2016
2.1.0.6501-pre1 1,586 1/21/2016
2.1.0.6500-pre1 1,408 1/20/2016
2.0.1.6505 92,501 1/28/2016
2.0.1.6495 74,738 1/20/2016
2.0.1.6492-pre1 3,873 12/3/2015
2.0.0.6490 96,425 12/1/2015
2.0.0.6484 17,773 11/21/2015
2.0.0.6482 236,707 11/17/2015
1.5.2.6478-pre3 1,295 11/17/2015
1.5.2.6477-pre2 3,892 11/10/2015
1.5.2.6469-pre1 2,201 10/20/2015
1.5.1.6471 75,965 10/20/2015
1.5.1.6468 3,918 10/20/2015
1.5.1.6460-pre2 1,673 10/13/2015
1.5.1.6455-pre1 3,028 10/2/2015
1.5.0.6447 53,789 9/25/2015
1.5.0.6446 21,528 9/16/2015
1.5.0.6404-pre3 3,321 8/25/2015
1.5.0.6401-pre2 1,528 8/21/2015
1.5.0.6396-pre1 1,983 8/5/2015
1.4.4.6449 2,721 9/25/2015
1.4.4.6443 1,673 9/16/2015
1.4.4.6392 76,420 7/29/2015
1.4.4.6391 2,034 7/28/2015
1.4.4.6387 2,971 7/27/2015
1.4.4.6379-pre3 1,556 7/20/2015
1.4.4.6378-pre2 1,383 7/16/2015
1.4.4.6377-pre1 1,377 7/14/2015
1.4.3.6376 41,519 7/9/2015
1.4.3.6374 16,578 7/1/2015
1.4.3.6372 2,091 6/30/2015
1.4.3.6364-pre3 2,346 6/16/2015
1.4.3.6358-pre2 5,778 4/24/2015
1.4.3.6356-pre1 1,482 4/21/2015
1.4.2.6359 61,315 4/30/2015
1.4.2.6355 14,287 4/21/2015
1.4.2.6353-pre2 2,524 3/31/2015
1.4.2.6350-pre1 1,584 3/30/2015
1.4.1.6349 44,310 3/30/2015
1.4.1.6347-pre2 3,263 3/19/2015
1.4.1.6342-pre1 1,726 3/10/2015
1.4.0.6341 28,753 3/9/2015
1.4.0.6340-pre2 2,550 3/6/2015
1.4.0.6336-pre1 1,549 3/3/2015
1.3.5.6337 5,131 3/5/2015
1.3.5.6335 24,678 3/2/2015
1.3.5.6333-pre1 2,113 2/17/2015
1.3.4.6332 18,907 2/17/2015
1.3.4.6331-pre4 1,574 2/13/2015
1.3.4.6329-pre3 1,309 2/12/2015
1.3.4.6328-pre2 1,312 2/11/2015
1.3.4.6325-pre1 1,277 2/9/2015
1.3.3.6323 52,483 2/9/2015
1.3.3.6322-pre3 1,274 2/6/2015
1.3.3.6321-pre2 1,434 2/4/2015
1.3.3.6318-pre1 1,441 2/2/2015
1.3.2.6316 7,739 2/3/2015
1.3.2.6313-pre3 1,419 1/30/2015
1.3.2.6309-pre2 1,463 1/28/2015
1.3.2.6299-pre1 2,178 1/20/2015
1.3.1.6296 55,217 1/4/2015
1.3.1.6294-pre1 4,469 12/24/2014
1.3.0.6292 9,605 12/24/2014
1.3.0.6286-pre4 2,179 12/19/2014
1.3.0.6284-pre3 1,676 12/12/2014
1.3.0.6280-pre2 1,631 12/9/2014
1.3.0.6275-pre1 7,907 11/12/2014
1.2.3.6257 38,797 10/2/2014
1.2.3.6256-pre4 2,319 9/26/2014
1.2.3.6255-pre3 2,723 9/20/2014
1.2.3.6249-pre2 1,893 9/9/2014
1.2.3.6246-pre1 4,438 8/15/2014
1.2.2.6243 28,579 7/30/2014
1.2.2.6241-pre3 2,829 7/28/2014
1.2.2.6240-pre2 4,667 7/22/2014
1.2.2.6238-pre1 3,801 7/17/2014
1.2.1.6229 8,533 7/14/2014
1.1.1.6206 14,248 6/19/2014
1.1.0.6201 13,503 6/12/2014
1.0.6197 4,240 6/4/2014
1.0.6188 11,737 5/28/2014
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