Conditionally running binding code in specific iOS version lead crash

[jingliancui]

Apple platform

iOS

Framework version

net9.0-*

Affected platform version

newest vscode

Description

There is a binding project that written with iOS 18 api.
But my app only a small feature need this binding project.
So I want to make this api disable in the lower iOS version.

But exception throw when I try below steps:

Crash with below log

Steps to Reproduce

1. binding setting

  <ItemGroup>
    <XcodeProject Include="../native/NewBinding/NewBinding.xcodeproj">
      <SchemeName>NewBinding</SchemeName>
      <!-- Metadata applicable to @(NativeReference) will be used if set, otherwise the following defaults will be used:
      <Kind>Framework</Kind>
      <SmartLink>true</SmartLink>
      -->
    </XcodeProject>
  </ItemGroup>

2. app setting

    <ItemGroup Condition="$(TargetFramework.Contains('ios'))">
        <ProjectReference Include="..\SubtitleUIBinding\NewBinding.MaciOS.Binding\NewBinding.MaciOS.Binding.csproj" />
    </ItemGroup>

3. Invoke binding api with condition block

	private void TryBtn_Clicked(object sender, EventArgs e)
	{
#if IOS18_0_OR_GREATER
		var theSourceTextModel = new SomeBinding.SourceModel();
#endif
	}

4. Run in iphone15 simulator which is iOS 17.4

Did you find any workaround?

No

Relevant log output

  Referenced from: <F50A89EB-0069-38D0-AFEB-0E3BD97FD137> /Users/ericcui/Library/Developer/CoreSimulator/Devices/6DDC4C6B-A6EC-468B-AF41-0E7BF29C2D78/data/Containers/Bundle/Application/B57F7C76-12C8-4698-A05C-CB9D70501D00/SampleApp.app/Frameworks/NewBinding.framework/NewBinding (built for iOS-sim 18.0 which is newer than running OS)

  Expected in:     <7B2AF674-532C-32AE-939D-3B38A9A7F087> /Library/Developer/CoreSimulator/Volumes/iOS_21E213/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 17.4.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/Translation.framework/Translation

[rolfbjarne]

You need to change the "Minimum Deployments" value in your Xcode project to the earliest iOS version you want to support.

Additionally, this won't work as you think, because it's a compile-time condition:

private void TryBtn_Clicked(object sender, EventArgs e)
	{
#if IOS18_0_OR_GREATER
		var theSourceTextModel = new SomeBinding.SourceModel();
#endif
	}

Do this instead, to check the iOS version at runtime:

private void TryBtn_Clicked(object sender, EventArgs e)
{
    if (OperatingSystem.IsIOSVersionAtLeast (18, 0)) {
        var theSourceTextModel = new SomeBinding.SourceModel();
    } else {
        // fallback code
    }
}