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There is a newer version of this package available.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
3.2.0.839982 5,450 9/17/2018
3.2.0.809874-pre3 1,854 9/10/2018
3.2.0.729530-pre2 5,684 8/14/2018
3.2.0.637442-pre1 5,961 7/17/2018
3.1.0.697729 117,361 8/1/2018
3.1.0.637273 57,156 7/11/2018
3.1.0.583944 94,058 6/20/2018
3.1.0.561732-pre4 4,402 6/11/2018
3.1.0.550168-pre3 2,108 6/6/2018
3.1.0.530888-pre2 1,152 6/4/2018
3.1.0.469394-pre1 9,416 5/9/2018
3.0.0.561731 104,240 6/11/2018
3.0.0.550146 20,255 6/6/2018
3.0.0.530893 14,429 6/4/2018
3.0.0.482510 150,399 5/14/2018
3.0.0.446417 82,067 5/1/2018
3.0.0.427558-pre4 7,227 4/25/2018
3.0.0.354232-pre3 11,040 4/5/2018
3.0.0.296286-pre2 7,095 3/20/2018
2.5.1.527436 45,802 5/4/2018
2.5.1.444934 114,532 4/4/2018
2.5.1.392594-pre3 3,510 3/21/2018
2.5.1.340284-pre2 5,108 3/9/2018
2.5.1.317207-pre1 4,958 3/1/2018
2.5.0.280555 253,848 2/16/2018
2.5.0.122203 255,491 12/18/2017
2.5.0.121934 163,553 11/28/2017
2.5.0.91635 111,409 11/16/2017
2.5.0.77107 24,131 11/13/2017
2.5.0.75255-pre3 4,710 11/10/2017
2.5.0.19271-pre2 7,966 10/20/2017
2.4.0.91020 35,862 11/16/2017
2.4.0.74863 31,375 11/10/2017
2.4.0.38779 54,456 10/30/2017
2.4.0.18342 49,716 10/20/2017
2.4.0.282 143,291 9/29/2017
2.4.0.280 147,325 9/27/2017
2.4.0.275-pre3 7,353 9/19/2017
2.4.0.269-pre2 12,560 8/29/2017
2.4.0.266-pre1 16,870 8/16/2017
2.3.5.256-pre6 30,853 6/29/2017
2.3.5.255-pre5 4,224 6/26/2017
2.3.5.239-pre3 26,160 5/11/2017
2.3.5.235-pre2 10,424 4/26/2017
2.3.5.233-pre1 8,259 4/13/2017
2.3.4.270 117,048 8/29/2017
2.3.4.267 58,075 8/16/2017
2.3.4.247 356,491 5/16/2017
2.3.4.231 191,264 4/12/2017
2.3.4.224 230,401 3/29/2017
2.3.4.221-pre6 6,656 3/27/2017
2.3.4.214-pre5 9,465 3/14/2017
2.3.4.212-pre4 5,561 3/10/2017
2.3.4.211-pre3 3,418 3/9/2017
2.3.4.192-pre2 18,234 2/3/2017
2.3.4.184-pre1 11,308 1/13/2017
2.3.3.193 219,125 2/1/2017
2.3.3.180 197,934 1/5/2017
2.3.3.175 113,572 12/6/2016
2.3.3.168 62,924 11/23/2016
2.3.3.166-pre4 6,849 11/3/2016
2.3.3.163-pre3 5,889 10/17/2016
2.3.3.152-pre2 14,533 9/15/2016
2.3.2.127 252,998 9/14/2016
2.3.2.118-pre1 6,346 8/3/2016
2.3.1.114 149,943 8/3/2016
2.3.1.113-pre3 3,338 7/19/2016
2.3.1.111-pre2 4,295 7/4/2016
2.3.1.110-pre1 1,974 6/29/2016
2.3.0.107 191,857 6/29/2016
2.3.0.49 78,632 6/16/2016
2.3.0.46-pre3 14,812 5/30/2016
2.3.0.38-pre2 12,175 4/27/2016
2.3.0.34-pre1 7,988 4/27/2016
2.2.0.45 111,868 5/30/2016
2.2.0.31 122,966 4/27/2016
2.2.0.23-pre4 2,657 4/20/2016
2.2.0.18-pre3 1,863 4/20/2016
2.2.0.5-pre2 15,510 4/8/2016
2.2.0.4-pre1 18,039 4/5/2016
2.1.0.6529 93,736 3/13/2016
2.1.0.6526 16,555 3/9/2016
2.1.0.6524 26,629 3/2/2016
2.1.0.6521 11,024 3/1/2016
2.1.0.6517-pre5 1,549 2/18/2016
2.1.0.6513-pre4 1,532 2/9/2016
2.1.0.6508-pre3 1,838 1/28/2016
2.1.0.6503-pre2 6,422 1/22/2016
2.1.0.6501-pre1 968 1/21/2016
2.1.0.6500-pre1 818 1/20/2016
2.0.1.6505 89,680 1/28/2016
2.0.1.6495 72,876 1/20/2016
2.0.1.6492-pre1 3,262 12/3/2015
2.0.0.6490 92,852 12/1/2015
2.0.0.6484 17,031 11/21/2015
2.0.0.6482 227,067 11/17/2015
1.5.2.6478-pre3 689 11/17/2015
1.5.2.6477-pre2 3,227 11/10/2015
1.5.2.6469-pre1 1,563 10/20/2015
1.5.1.6471 73,166 10/20/2015
1.5.1.6468 3,253 10/20/2015
1.5.1.6460-pre2 1,053 10/13/2015
1.5.1.6455-pre1 2,352 10/2/2015
1.5.0.6447 48,830 9/25/2015
1.5.0.6446 20,446 9/16/2015
1.5.0.6404-pre3 2,720 8/25/2015
1.5.0.6401-pre2 877 8/21/2015
1.5.0.6396-pre1 1,399 8/5/2015
1.4.4.6449 2,084 9/25/2015
1.4.4.6443 1,079 9/16/2015
1.4.4.6392 73,259 7/29/2015
1.4.4.6391 1,456 7/28/2015
1.4.4.6387 2,352 7/27/2015
1.4.4.6379-pre3 952 7/20/2015
1.4.4.6378-pre2 788 7/16/2015
1.4.4.6377-pre1 768 7/14/2015
1.4.3.6376 38,265 7/9/2015
1.4.3.6374 15,734 7/1/2015
1.4.3.6372 1,505 6/30/2015
1.4.3.6364-pre3 1,723 6/16/2015
1.4.3.6358-pre2 5,144 4/24/2015
1.4.3.6356-pre1 839 4/21/2015
1.4.2.6359 57,245 4/30/2015
1.4.2.6355 13,304 4/21/2015
1.4.2.6353-pre2 1,924 3/31/2015
1.4.2.6350-pre1 1,019 3/30/2015
1.4.1.6349 43,040 3/30/2015
1.4.1.6347-pre2 2,693 3/19/2015
1.4.1.6342-pre1 1,118 3/10/2015
1.4.0.6341 27,540 3/9/2015
1.4.0.6340-pre2 1,847 3/6/2015
1.4.0.6336-pre1 996 3/3/2015
1.3.5.6337 4,540 3/5/2015
1.3.5.6335 21,917 3/2/2015
1.3.5.6333-pre1 1,376 2/17/2015
1.3.4.6332 16,959 2/17/2015
1.3.4.6331-pre4 931 2/13/2015
1.3.4.6329-pre3 721 2/12/2015
1.3.4.6328-pre2 749 2/11/2015
1.3.4.6325-pre1 723 2/9/2015
1.3.3.6323 49,946 2/9/2015
1.3.3.6322-pre3 682 2/6/2015
1.3.3.6321-pre2 851 2/4/2015
1.3.3.6318-pre1 812 2/2/2015
1.3.2.6316 6,970 2/3/2015
1.3.2.6313-pre3 784 1/30/2015
1.3.2.6309-pre2 841 1/28/2015
1.3.2.6299-pre1 1,554 1/20/2015
1.3.1.6296 52,124 1/4/2015
1.3.1.6294-pre1 3,798 12/24/2014
1.3.0.6292 8,803 12/24/2014
1.3.0.6286-pre4 1,601 12/19/2014
1.3.0.6284-pre3 1,119 12/12/2014
1.3.0.6280-pre2 1,032 12/9/2014
1.3.0.6275-pre1 7,297 11/12/2014
1.2.3.6257 37,017 10/2/2014
1.2.3.6256-pre4 1,724 9/26/2014
1.2.3.6255-pre3 2,115 9/20/2014
1.2.3.6249-pre2 1,316 9/9/2014
1.2.3.6246-pre1 3,793 8/15/2014
1.2.2.6243 27,247 7/30/2014
1.2.2.6241-pre3 2,246 7/28/2014
1.2.2.6240-pre2 4,056 7/22/2014
1.2.2.6238-pre1 3,153 7/17/2014
1.2.1.6229 7,711 7/14/2014
1.1.1.6206 13,638 6/19/2014
1.1.0.6201 12,504 6/12/2014
1.0.6197 3,589 6/4/2014
1.0.6188 10,905 5/28/2014
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