[Bug][iOS] Tapping on NavigationBar does not trigger UnFocus for Entries

[banditoth]

Description

I'm wondering if this is actually a bug or excepted behaviour on iOS. Let's make a discussion about it.
When you are focusing an entry, and trying to close it by tapping on the NavigationBar's free space, the entry does not get unfocused and the virtual keyboard keeps presented.

Steps to Reproduce

1. Create a Shell with content
2. Place a SearchBar/Entry on content page
3. Run the app.
4. Click in the search bar
5. Try closing it by tapping on the navigation bar

Expected Behavior

I assume it should close the virtual keyboard and trigger the unfocus event.

Actual Behavior

The opposite how it should work :P

Basic Information

• Version with issue: Xamarin.Forms 5.0.0.2401 // Probably MAUI is affected too

Environment

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Visual Studio Community 2022 for Mac
Version 17.5 (build 1802)
Installation UUID: 2c7e118d-448d-4657-90d1-cb26d316a06a

Runtime
.NET 7.0.1 (64-bit)
Architecture: Arm64
Microsoft.macOS.Sdk 12.3.2372; git-rev-head:754abbf6a3563f6267e5717ae832b4ac25b1f2fb; git-branch:release/7.0.1xx-xcode13.3

Roslyn (Language Service)
4.5.0-3.23056.2+97881342e427ff5cdcba8f12b12ff8e6f3564431

NuGet
Version: 6.4.0.117

.NET SDK (Arm64)
SDK: /usr/local/share/dotnet/sdk/7.0.200/Sdks
SDK Versions:
	7.0.200
	7.0.102
	7.0.101
	7.0.100
	6.0.406
	6.0.405
	6.0.404
	6.0.403
	6.0.402
	6.0.401
	6.0.400
	6.0.400-preview.22255.2
	6.0.302
	6.0.301
	6.0.300
	6.0.202
	6.0.201
	6.0.200
MSBuild SDKs: /Applications/Visual Studio.app/Contents/MonoBundle/MSBuild/Current/bin/Sdks

.NET SDK (x64)
SDK Versions:
	6.0.406
	6.0.405
	6.0.404
	6.0.403
	6.0.402
	6.0.401
	6.0.400
	6.0.302
	6.0.301
	6.0.300
	6.0.203
	6.0.202
	6.0.201
	6.0.200
	6.0.105
	6.0.102
	5.0.408
	5.0.407
	5.0.406
	5.0.405
	3.1.426
	3.1.425
	3.1.424
	3.1.423
	3.1.422
	3.1.421
	3.1.420
	3.1.419
	3.1.418
	3.1.417
	3.1.416

.NET Runtime (Arm64)
Runtime: /usr/local/share/dotnet/dotnet
Runtime Versions:
	7.0.3
	7.0.2
	7.0.1
	7.0.0
	6.0.14
	6.0.13
	6.0.12
	6.0.11
	6.0.10
	6.0.9
	6.0.8
	6.0.7
	6.0.6
	6.0.4
	6.0.3
	6.0.2

.NET Runtime (x64)
Runtime: /usr/local/share/dotnet/x64/dotnet
Runtime Versions:
	6.0.14
	6.0.13
	6.0.12
	6.0.11
	6.0.10
	6.0.9
	6.0.8
	6.0.7
	6.0.6
	6.0.5
	6.0.4
	6.0.3
	6.0.2
	5.0.17
	5.0.16
	5.0.15
	5.0.14
	3.1.32
	3.1.31
	3.1.30
	3.1.29
	3.1.28
	3.1.27
	3.1.26
	3.1.25
	3.1.24
	3.1.23
	3.1.22

Xamarin.Profiler
Version: 1.8.0.49
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler

Updater
Version: 11

Xamarin.Android
Version: 13.2.0.0 (Visual Studio Community)
Commit: xamarin-android/d17-5/797e2e1
Android SDK: /Users/banditoth/Library/Developer/Xamarin/android-sdk-macosx
	Supported Android versions:
		12.0 (API level 31)
		11.0 (API level 30)
		9.0  (API level 28)
		13.0 (API level 33)

SDK Command-line Tools Version: 7.0
SDK Platform Tools Version: 33.0.2
SDK Build Tools Version: 33.0.0

Build Information: 
Mono: 6dd9def
Java.Interop: xamarin/java.interop/main@149d70fe
SQLite: xamarin/sqlite/3.40.0@fdc1e34
Xamarin.Android Tools: xamarin/xamarin-android-tools/main@9f02d77

Microsoft Build of OpenJDK
Java SDK: /Library/Java/JavaVirtualMachines/microsoft-11.jdk
11.0.16.1
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL

Eclipse Temurin JDK
Java SDK: /Library/Java/JavaVirtualMachines/temurin-8.jdk
1.8.0.302
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL

Android SDK Manager
Version: 17.5.0.33
Hash: f0c0c52
Branch: remotes/origin/d17-5~2
Build date: 2023-02-14 00:26:05 UTC

Android Device Manager
Version: 0.0.0.1245
Hash: 7f8a990
Branch: 7f8a990
Build date: 2023-02-14 00:26:05 UTC

Apple Developer Tools
Xcode: 14.2 21534
Build: 14C18

Xamarin.Mac
Version: 9.1.0.5 Visual Studio Community
Hash: 7738c90c9
Branch: xcode14.2
Build date: 2023-01-25 15:56:14-0500

Xamarin.iOS
Version: 16.2.0.5 Visual Studio Community
Hash: 7738c90c9
Branch: xcode14.2
Build date: 2023-01-25 15:56:15-0500

Xamarin Designer
Version: 17.5.3.47
Hash: e8b5d371c3
Branch: remotes/origin/d17-5
Build date: 2023-02-14 00:26:00 UTC

Build Information
Release ID: 1705001802
Git revision: bfdc90915981031f5bdda171c7eebf116a558598
Build date: 2023-02-14 00:24:08+00
Build branch: release-17.5
Build lane: release-17.5

Operating System
Mac OS X 13.2.1
Darwin 22.3.0 Darwin Kernel Version 22.3.0
    Mon Jan 30 20:38:37 PST 2023
    root:xnu-8792.81.3~2/RELEASE_ARM64_T6000 arm64

Workaround

Create an event subscriber for the TextChanged event, and when the text is string.isnullorempty, trigger the usercontrol's UnFocus method manually.