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
3.1.0.583944 6,502 6/20/2018
3.1.0.561732-pre4 2,685 6/11/2018
3.1.0.550168-pre3 1,514 6/6/2018
3.1.0.530888-pre2 933 6/4/2018
3.1.0.469394-pre1 7,377 5/9/2018
3.0.0.561731 25,849 6/11/2018
3.0.0.550146 14,350 6/6/2018
3.0.0.530893 10,053 6/4/2018
3.0.0.482510 94,906 5/14/2018
3.0.0.446417 61,669 5/1/2018
3.0.0.427558-pre4 6,172 4/25/2018
3.0.0.354232-pre3 8,607 4/5/2018
3.0.0.296286-pre2 6,261 3/20/2018
2.5.1.527436 26,356 5/4/2018
2.5.1.444934 92,177 4/4/2018
2.5.1.392594-pre3 2,795 3/21/2018
2.5.1.340284-pre2 4,438 3/9/2018
2.5.1.317207-pre1 4,270 3/1/2018
2.5.0.280555 225,025 2/16/2018
2.5.0.122203 221,958 12/18/2017
2.5.0.121934 147,218 11/28/2017
2.5.0.91635 98,308 11/16/2017
2.5.0.77107 21,414 11/13/2017
2.5.0.75255-pre3 4,018 11/10/2017
2.5.0.19271-pre2 7,084 10/20/2017
2.4.0.91020 29,962 11/16/2017
2.4.0.74863 29,060 11/10/2017
2.4.0.38779 52,060 10/30/2017
2.4.0.18342 46,536 10/20/2017
2.4.0.282 134,957 9/29/2017
2.4.0.280 128,632 9/27/2017
2.4.0.275-pre3 6,637 9/19/2017
2.4.0.269-pre2 11,856 8/29/2017
2.4.0.266-pre1 15,021 8/16/2017
2.3.5.256-pre6 28,720 6/29/2017
2.3.5.255-pre5 3,658 6/26/2017
2.3.5.239-pre3 24,870 5/11/2017
2.3.5.235-pre2 9,701 4/26/2017
2.3.5.233-pre1 7,593 4/13/2017
2.3.4.270 107,760 8/29/2017
2.3.4.267 55,128 8/16/2017
2.3.4.247 340,134 5/16/2017
2.3.4.231 183,983 4/12/2017
2.3.4.224 223,774 3/29/2017
2.3.4.221-pre6 6,149 3/27/2017
2.3.4.214-pre5 9,014 3/14/2017
2.3.4.212-pre4 5,091 3/10/2017
2.3.4.211-pre3 2,856 3/9/2017
2.3.4.192-pre2 17,515 2/3/2017
2.3.4.184-pre1 10,455 1/13/2017
2.3.3.193 210,297 2/1/2017
2.3.3.180 193,627 1/5/2017
2.3.3.175 111,849 12/6/2016
2.3.3.168 61,838 11/23/2016
2.3.3.166-pre4 6,532 11/3/2016
2.3.3.163-pre3 5,616 10/17/2016
2.3.3.152-pre2 13,856 9/15/2016
2.3.2.127 247,961 9/14/2016
2.3.2.118-pre1 6,106 8/3/2016
2.3.1.114 147,111 8/3/2016
2.3.1.113-pre3 3,093 7/19/2016
2.3.1.111-pre2 4,065 7/4/2016
2.3.1.110-pre1 1,744 6/29/2016
2.3.0.107 189,568 6/29/2016
2.3.0.49 74,776 6/16/2016
2.3.0.46-pre3 14,244 5/30/2016
2.3.0.38-pre2 11,704 4/27/2016
2.3.0.34-pre1 7,635 4/27/2016
2.2.0.45 108,025 5/30/2016
2.2.0.31 121,013 4/27/2016
2.2.0.23-pre4 2,429 4/20/2016
2.2.0.18-pre3 1,637 4/20/2016
2.2.0.5-pre2 15,266 4/8/2016
2.2.0.4-pre1 17,809 4/5/2016
2.1.0.6529 91,973 3/13/2016
2.1.0.6526 16,188 3/9/2016
2.1.0.6524 26,080 3/2/2016
2.1.0.6521 10,566 3/1/2016
2.1.0.6517-pre5 1,327 2/18/2016
2.1.0.6513-pre4 1,310 2/9/2016
2.1.0.6508-pre3 1,608 1/28/2016
2.1.0.6503-pre2 6,196 1/22/2016
2.1.0.6501-pre1 747 1/21/2016
2.1.0.6500-pre1 596 1/20/2016
2.0.1.6505 88,284 1/28/2016
2.0.1.6495 71,836 1/20/2016
2.0.1.6492-pre1 3,034 12/3/2015
2.0.0.6490 90,832 12/1/2015
2.0.0.6484 16,738 11/21/2015
2.0.0.6482 222,638 11/17/2015
1.5.2.6478-pre3 465 11/17/2015
1.5.2.6477-pre2 2,961 11/10/2015
1.5.2.6469-pre1 (current) 1,339 10/20/2015
1.5.1.6471 71,981 10/20/2015
1.5.1.6468 3,004 10/20/2015
1.5.1.6460-pre2 828 10/13/2015
1.5.1.6455-pre1 2,106 10/2/2015
1.5.0.6447 47,142 9/25/2015
1.5.0.6446 19,947 9/16/2015
1.5.0.6404-pre3 2,488 8/25/2015
1.5.0.6401-pre2 650 8/21/2015
1.5.0.6396-pre1 1,174 8/5/2015
1.4.4.6449 1,835 9/25/2015
1.4.4.6443 854 9/16/2015
1.4.4.6392 71,769 7/29/2015
1.4.4.6391 1,225 7/28/2015
1.4.4.6387 2,123 7/27/2015
1.4.4.6379-pre3 731 7/20/2015
1.4.4.6378-pre2 566 7/16/2015
1.4.4.6377-pre1 543 7/14/2015
1.4.3.6376 36,654 7/9/2015
1.4.3.6374 15,309 7/1/2015
1.4.3.6372 1,279 6/30/2015
1.4.3.6364-pre3 1,498 6/16/2015
1.4.3.6358-pre2 4,892 4/24/2015
1.4.3.6356-pre1 615 4/21/2015
1.4.2.6359 55,163 4/30/2015
1.4.2.6355 12,847 4/21/2015
1.4.2.6353-pre2 1,693 3/31/2015
1.4.2.6350-pre1 793 3/30/2015
1.4.1.6349 42,524 3/30/2015
1.4.1.6347-pre2 2,470 3/19/2015
1.4.1.6342-pre1 896 3/10/2015
1.4.0.6341 27,078 3/9/2015
1.4.0.6340-pre2 1,596 3/6/2015
1.4.0.6336-pre1 774 3/3/2015
1.3.5.6337 4,290 3/5/2015
1.3.5.6335 21,052 3/2/2015
1.3.5.6333-pre1 1,149 2/17/2015
1.3.4.6332 16,403 2/17/2015
1.3.4.6331-pre4 710 2/13/2015
1.3.4.6329-pre3 500 2/12/2015
1.3.4.6328-pre2 528 2/11/2015
1.3.4.6325-pre1 501 2/9/2015
1.3.3.6323 48,706 2/9/2015
1.3.3.6322-pre3 462 2/6/2015
1.3.3.6321-pre2 629 2/4/2015
1.3.3.6318-pre1 587 2/2/2015
1.3.2.6316 6,675 2/3/2015
1.3.2.6313-pre3 561 1/30/2015
1.3.2.6309-pre2 617 1/28/2015
1.3.2.6299-pre1 1,329 1/20/2015
1.3.1.6296 50,886 1/4/2015
1.3.1.6294-pre1 3,542 12/24/2014
1.3.0.6292 8,507 12/24/2014
1.3.0.6286-pre4 1,376 12/19/2014
1.3.0.6284-pre3 894 12/12/2014
1.3.0.6280-pre2 808 12/9/2014
1.3.0.6275-pre1 7,072 11/12/2014
1.2.3.6257 36,317 10/2/2014
1.2.3.6256-pre4 1,496 9/26/2014
1.2.3.6255-pre3 1,882 9/20/2014
1.2.3.6249-pre2 1,091 9/9/2014
1.2.3.6246-pre1 3,541 8/15/2014
1.2.2.6243 26,626 7/30/2014
1.2.2.6241-pre3 2,019 7/28/2014
1.2.2.6240-pre2 3,820 7/22/2014
1.2.2.6238-pre1 2,899 7/17/2014
1.2.1.6229 7,374 7/14/2014
1.1.1.6206 13,387 6/19/2014
1.1.0.6201 12,084 6/12/2014
1.0.6197 3,305 6/4/2014
1.0.6188 10,531 5/28/2014
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