[Bug] [iOS] Accessibility text size not increasing automatically when coming back from Settings.

[dasunmax89]

Description

With iOS system applications, when the user leaves an app running in the background, opens the Settings app, adjusts the system text size, and returns to the app, all views in the app refresh their text size to meet the new system font size. This does not occur with apps written using xamarin forms, and the app must be restarted for the system font size change to take effect. it does not automatically update to match the new system font size.

Steps to Reproduce

1. Create a new project using New > App > Multiplatform > Xamarin Forms > Blank App.
2. Change the label font sizes to any named font size and run the app
3. Take note of the current text size of the template text
4. Navigate to the iOS Settings app, go to General > Accessibility > Larger Text, and change the font size to the largest size
5. Double tap on the home button, and return to the app
6. Note that the text size has not changed
7. Reload the app by restarting it on iOS
8. Note that the font size has changed

Expected Behavior

Like some native apps, the text size should be changed in real-time

Actual Behavior

The text size has not changed in realtime

Basic Information

• Version with issue:5.0.0.2545
• Last known good version:
• Platform Target Frameworks:
  • iOS: 16.2
  • Android: 13(API Level 33)
• Android Support Library / AndroidX Version: N.A
• NuGet Packages: Xamarin.Essentials 1.7.4,Xamarin Forms 5.0.0.2545
• Affected Devices:
  -Build tools: Visual Studio 17.4.1, iOS 16.2, Xcode 14.2 (14C18)

Environment

Show/Hide Visual Studio info

Visual Studio Community 2022 for Mac Version 17.4.1 (build 28) Installation UUID: 9e4c81bd-05ad-4d92-a478-f9db03a38a5a

Runtime
.NET 6.0.9 (64-bit)
Architecture: X64

Roslyn (Language Service)
4.4.0-6.22578.12+3c6ab8e1715e5b080fb7bb77070810ab71e09387

NuGet
Version: 6.3.1.1

.NET SDK (x64)
SDK: /usr/local/share/dotnet/sdk/7.0.100/Sdks
SDK Versions:
7.0.100
6.0.403
6.0.402
6.0.400
6.0.302
6.0.301
6.0.300
5.0.408
5.0.407
5.0.405
5.0.404
5.0.403
5.0.402
5.0.401
5.0.302
3.1.425
3.1.424
3.1.422
3.1.421
3.1.420
3.1.419
3.1.418
3.1.416
3.1.415
3.1.414
3.1.413
3.1.411
MSBuild SDKs: /Applications/Visual Studio.app/Contents/MonoBundle/MSBuild/Current/bin/Sdks

.NET Runtime (x64)
Runtime: /usr/local/share/dotnet/dotnet
Runtime Versions:
7.0.0
6.0.11
6.0.10
6.0.8
6.0.7
6.0.6
6.0.5
5.0.17
5.0.16
5.0.14
5.0.13
5.0.12
5.0.11
5.0.10
5.0.8
3.1.31
3.1.30
3.1.28
3.1.27
3.1.26
3.1.25
3.1.24
3.1.22
3.1.21
3.1.20
3.1.19
3.1.17
2.1.30

Xamarin.Profiler
Version: 1.8.0.19
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler

Updater
Version: 11

Xamarin.Android
Version: 13.1.0.1 (Visual Studio Community)
Commit: xamarin-android/d17-4/13ba222
Android SDK: /Users/dasunnayanajith/Library/Developer/Xamarin/android-sdk-macosx
Supported Android versions:
12.1 (API level 32)
12.0 (API level 31)
11.0 (API level 30)
10.0 (API level 29)
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: a96bde9
Java.Interop: xamarin/java.interop/d17-4@fcc33ce2
SQLite: xamarin/sqlite@23e1ae7
Xamarin.Android Tools: xamarin/xamarin-android-tools/main@0be567a

Microsoft Build of OpenJDK
Java SDK: /Library/Java/JavaVirtualMachines/microsoft-11.jdk
11.0.12
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: 17.4.0.54
Hash: 6eabb9e
Branch: remotes/origin/d17-4
Build date: 2022-12-02 15:34:47 UTC

Android Device Manager
Version: 0.0.0.1206
Hash: 886af39
Branch: 886af39
Build date: 2022-12-02 15:34:47 UTC

Xamarin Designer
Version: 17.4.0.136
Hash: d49c9ff6d3
Branch: remotes/origin/d17-4
Build date: 2022-12-02 15:34:42 UTC

Apple Developer Tools
Xcode 14.2 (21534)
Build 14C18

Xamarin.Mac
Version: 8.12.0.2 (Visual Studio Community)
Hash: 87f98a75e
Branch: d17-3
Build date: 2022-07-25 20:18:54-0400

Xamarin.iOS
Version: 16.0.0.72 (Visual Studio Community)
Hash: 6756a1146
Branch: release/6.0.4xx-xcode14
Build date: 2022-09-21 08:51:06-0400

Build Information
Release ID: 1704010028
Git revision: f17dcd4436244cc06ed14dc5238c4d3fa788144f
Build date: 2022-12-02 15:32:32+00
Build branch: release-17.4
Build lane: release-17.4

Operating System
Mac OS X 12.6.0
Darwin 21.6.0 Darwin Kernel Version 21.6.0
Mon Aug 22 20:17:10 PDT 2022
root:xnu-8020.140.49~2/RELEASE_X86_64 x86_64

Build Logs

Screenshots

Reproduction Link

Archive.zip

Workaround

Couldn't find any

[chinochuy]

Same issue here,

iOS dont change fontSize when app comeback from iOS settings

[chinochuy]

any update on this?