Prism provides an implementation of a collection of design patterns that are helpful in writing well structured and maintainable XAML applications, including MVVM, dependency injection, commanding, event aggregation, and more. Prism's core functionality is a shared code base in a Portable Class Library targeting these platforms; WPF, Windows 10 UWP, and Xamarin Forms. Features that need to be platform specific are implemented in the respective libraries for the target platform. Prism for Xamarin.Forms helps you more easily design and build rich, flexible, and easy to maintain Xamarin.Forms applications.

This is a prerelease version of Prism.Forms.
There is a newer version of this package available.
See the version list below for details.
Install-Package Prism.Forms -Version
dotnet add package Prism.Forms --version
<PackageReference Include="Prism.Forms" Version="" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Prism.Forms --version
The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Release Notes

## Prism.Core
* .NET Standard Support
* Added method to clear all errors on ErrorsContainer
* Add capability to DelegateCommand's ObservesProperty to observe properties of complex types
`ObservesProperty(() => Property.NestedProperty.NestedPoperty)`

## Prism.Forms
* Fixed #683: .NET Standard support
* Fixed #765: Deep linking within a NavigationPage results in an incorrect ContentPage Title on Android
* Fixed #1008: NavigationParameters: Not possible to specify parent type as generic parameter T
* Fixed #1024: XF: NavigationService swallowing Exceptions
* Fixed #1025: Xamarin.Forms deprecated the Device.OS property in favor of the RuntimePlatform property.
* Fixed #1027: Support macOS
* Fixed #1044: When Detail of MasterDetailPage is null, Modal Navigation is possible
* Fixed #1045: When calling NavigateAsync with NavigationPage, old page's Destroy on the stack is not called
* Fixed #1046: When calling DeepLink from Navigation Stack, the second page becomes Modal navigation
* Fixed #1054: When deep linking within NavigationPage, page order is reversed
* Fixed #1063: Master of MasterDetailPage will not be destroyed
* Fixed #1085: Error occurs if null path is specified in EventToCommandBehavior
* Fixed #1089: DebugLogger does not work in nuget-package
* Fixed #1132: Prism Forms Modularity extension methods
* Fixed #1133: IModuleCatalog AddModule returns wrong type
* Fixed #1139: Modularity Enhancements
* Fixed #1076: IActiveAware not working when ContentPage (as child of a TabbedPage) is wrapped into a NavigationPage

* deprecated OnPlatform methods
* added DeviceRuntimePlatform property - this mimics the XF API and returns a string
* added RuntimePlatform property which returns an Enum of type RuntimePlatform and wraps the XF string-based values

**Container Extensions**
* deprecated the RegisterTypeForNavigationOnPlatform signature that requires explicit platform parameters
* added new signature that accepts new IPlatform objects
Container.RegisterTypeForNavigationOnPlatform<MainPage, MainPageViewModel>("Main",
new Platform<MainPage_Android>(RuntimePlatform.Android),
new Platform<MainPage_iOS>(RuntimePlatform.iOS));

# TabbedPage Navigation Behavior Change - BREAKING
## Current Behavior (v6.3.0)
`NavigateAsync("TabbedPage/ViewA/ViewB")` will select the tab ViewA in the TabbedPage if it exists, then continue navigating.  If ViewA does not exist as a tab, then you will continue to navigate as expected.

`NavigateAsync("TabbedPage/NavigationPage/ViewA/ViewB")` would search the TabbedPage for the first instance of a tab that was a NavigationPage, then navigate within the Navigation page the remaining ViewA and ViewB pages.  This provided the ability to deep link into a tab's nested navigation page, but there was no way to opt-out of this behavior.

Also, the INavigationAware methods did not get called to all tabs meaning that you would be responsible for forwarding any parameters to all your tabs.

## New Behavior
`NavigateAsync("TabbedPage/ViewA/ViewB")` will **no longer** select any tabs, but rather continue processing the navigation as separate pages on the navigation stack.

If you wish to select a tab, you will now use a parameter called "selectedTab" to indicate which tab you would like to select.


This will navigate to the TabbedPage, selected the "MiddleTab" and continue navigating ViewA and ViewB onto the navigation stack.

For tabs that are wrapped inside a NavigationPage, you can use the "|" symbol to indicate the hierarchy.


There is a constant in the `KnownNavigationParameters` called `SelectedTab` that you can use instead of a string.


This will search each tab to see if it is a navigation page and if the first page on the stack matches "MiddleTab".  This is much more flexible than the existing behavior as before it would take the first instance of the NavigationPage found.  Now you can choose which tab exactly.

Some INavigationAware methods are now fired on all Tabs:
- OnNavigatingTo will be invoked on the TabbedPage and ALL TABS.
- OnNavigatedTo will be invoked on the TabbedPage and only the SELECTED TAB.
- OnNavigatedFrom will be invoked on the TabbedPage and only the SELECTED TAB.

**Note**: the parameter key `selectedTab` is now a reserved parameter name.  Similar to a reserved keyword in C#.  If you use this in your app as a key, you may experience undesired behavior.

**Note**: At this time there is no native support for deep linking into a Tab that is a navigation page.  Please let me know if you need this functionality.

Showing the top 8 GitHub repositories that depend on Prism.Forms:

Repository Stars
Makes things cross-platform
A Xamarin Framework for Backgrounding & Device Hardware Services (iOS, Android, UWP, Tizen, tvOS, watchOS, & more coming soon)
Samples that demonstrate how to use various Prism features with Xamarin.Forms
SettingsView for Xamarin.Forms
AiForms.Effects for Xamarin.Forms
Xamarin.Forms goodlooking UI sample
Full stack dev framework for C# / TypeScript / JavaScript developers
This provides extensibility for Prism.Forms INavigationService to handle Popup Views

Read more about the GitHub Usage information on our documentation.

Version History

Version Downloads Last updated 313 5/5/2020 140,402 11/21/2019 114,480 7/24/2019 3,734 6/11/2019 2,699 5/6/2019 3,347 2/20/2019 1,582 12/4/2018 345,664 10/15/2018 2,075 9/20/2018 27,184 6/15/2018 1,325 5/9/2018 9,349 4/2/2018 209,495 1/22/2018 20,077 1/12/2018 9,390 12/7/2017 3,353 11/16/2017 16,868 10/13/2017 3,833 10/6/2017
7.0.0-pre1 1,109 9/22/2017
6.3.0 148,971 3/25/2017
6.3.0-pre2 3,261 2/26/2017
6.3.0-pre1 12,358 11/2/2016
6.2.0 40,062 8/9/2016
6.1.0-pre7 1,321 7/15/2016
6.1.0-pre6 1,195 6/21/2016
6.1.0-pre5 3,038 5/5/2016
6.1.0-pre4 2,501 4/5/2016
6.1.0-pre3 5,399 1/20/2016
6.1.0-pre2 1,162 12/10/2015
6.1.0-pre1 867 12/3/2015
6.0.1 7,279 10/26/2015
6.0.0 1,988 10/14/2015
5.9.0-pre2 607 10/12/2015
5.8.0-pre1 608 10/8/2015
5.7.0-pre3 1,100 6/10/2015
5.7.0-pre2 446 6/10/2015
5.7.0-pre1 921 6/8/2015
5.6.1-pre1 857 3/24/2015
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