UNO Default template crashes in release on iOS

[MateoVanDamme]

I created a new Uno Platform App app in visual studio using the Uno Platform extension (5.5.37.40). It runs in debug on Windows/iOS/Android but in release it crashes only on iOS after showing the .NET loading screen.

Uno checks says everything is ok and I reinstalled visual studio 2022 to be sure.

As requested on the Discord I uploaded the sample solution as well as device logs here: https://github.com/MateoVanDamme/uno-release-question

Extra info:

UNO Template Settings

Framework: .NET 8.0 

Platforms to support: Android, iOS, Windows
Presentation: MVVM
Markup: XAML

Theme:
Theme: Fluent 
Theme Service

Extensions:
Extensions: Dependency Injection
Navigation: Blank
Logging: Serilog

Features: Toolkit.

Authentication: None

Testing: Unit Tests, UI test
Pipeline: None

NOTE: I modified the csproj file slightly. I added <ProvisioningType>manual</ProvisioningType> at the top.

UNO Check 1.26.1 output

> OpenJDK 11.0 Checkup...
  - 17.0.8.1 (C:\Program Files (x86)\Android\openjdk\jdk-17.0.8.101-hotspot\bin\..)
  - 11.0.20.1 (C:\Program Files\Microsoft\jdk-11.0.20.101-hotspot\bin\..)

> Visual Studio 17.11.0 Checkup...
  - 17.11.5 - C:\Program Files\Microsoft Visual Studio\2022\Enterprise

> Visual Studio Workloads Checkup...
  - .NET desktop development is installed (17.11.5)
  - .NET Multi-platform App UI development is installed (17.11.5)
  - ASP.NET and web development is installed (17.11.5)

> Android SDK Checkup...
  - emulator (32.1.15)
  - build-tools;34.0.0 (34.0.0)
  - platforms;android-34 (3)
  - system-images;android-34;google_apis;x86_64 (10)
  - platform-tools (35.0.2)
  - cmdline-tools;5.0 (5.0)

> Android Emulator Checkup...
  - Emulator: custom_tablet found.

> .NET SDK Checkup...
  - 8.0.201 - C:\Program Files\dotnet\sdk\8.0.201
  - 8.0.300 - C:\Program Files\dotnet\sdk\8.0.300
  - 8.0.402 - C:\Program Files\dotnet\sdk\8.0.402
  - 8.0.403 - C:\Program Files\dotnet\sdk\8.0.403

> PowerShell Execution Policy Checkup...

> Windows Python Installation Checkup...
  - Python is installed in C:\Users\MateoVanDamme\AppData\Local\Microsoft\WindowsApps\python.exe
.

> Windows Long Path Checkup...
  - Long paths are enabled on Windows!

> Git Checkup...
SHELL: git --version
git version 2.43.0.windows.1

> Windows Hyper-V Checkup...
  - Hyper-V is configured

> dotnet new Uno Project Command Line Templates Checkup...

> Uno SDK Checkup...

> Edge WebView2 Checkup...
  - Found Edge WebView2 version 130.0.2849.56

> .NET SDK - Workloads (8.0.401) Checkup...
  - microsoft.net.sdk.android (34.0.113/8.0.100) installed.
  - microsoft.net.sdk.ios (17.5.8020/8.0.100) installed.
  - microsoft.net.sdk.maccatalyst (17.5.8020/8.0.100) installed.
  - microsoft.net.sdk.macos (14.5.8020/8.0.100) installed.
  - microsoft.net.sdk.maui (8.0.72/8.0.100) installed.
───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

- Congratulations, everything looks great!

PC Hardware Information

Device name	DESKTOP-DTM1H49
Processor	13th Gen Intel(R) Core(TM) i9-13900H   2.60 GHz
Installed RAM	32,0 GB (31,7 GB usable)
Device ID	27F92ED6-27C5-46A1-8AD6-4CEB480753B7
Product ID	00355-61186-10664-AAOEM
System type	64-bit operating system, x64-based processor
Pen and touch	Touch support with 10 touch points

PC OS Information

Edition	Windows 11 Business
Version	23H2
Installed on	11/12/2023
OS build	22631.4391
Experience	Windows Feature Experience Pack 1000.22700.1047.0

iPad information

iPadOS Version: 17.7.1
Model Name iPad (10th generation)

[jeromelaban]

Thanks for the information. There's no iPadLog.txt file in the repository you mentioned, could you add it?

[MateoVanDamme]

That is correct. I can probably borrow one from a colleague if needed.

[jeromelaban]

Thanks. In general, release builds are meant to be created on mac devices, as the result from a Windows build cannot be deployed to the store. We'll update the documentation to explain this.

More information about Hot Restart.

[MateoVanDamme]

Can I deploy a release build on Windows to the physical iPad itself though? Not for getting it to the store but for testing the application with optimizations etc applied?

[jeromelaban]

The documentation for the HotRestart feature explicitly says that it is not:

Hot restart isn't a replacement for the full build experience provided by a Mac build host. For example, it can only deploy apps that use the debug build configuration, and it doesn't support static libraries and frameworks, XCFrameworks, or binding resource packages. For more information, see Limitations.

[MateoVanDamme]

Fair enough. Thanks I'll forward it to my team. Hopefully I don't need to build on Linux for Android devices or something ;)

[jeromelaban]

Android, WebAssembly and Desktop builds are supported on Linux without issues on both configurations.