[IOS] Swift Compilation Error in NewTabView.swift - Generic Parameter Inference Failure

[PaviSF]

Before submitting a new issue

• I tested using the latest version of the library, as the bug might be already fixed.
• I tested using a supported version of react native.
• I checked for possible duplicate issues, with possible answers.

Bug summary

When building an iOS project with react-native-bottom-tabs, compilation fails with Swift type inference errors in NewTabView.swift. The issue occurs on iOS 26.0+ code paths related to @Environment key paths.

Library version

1.1.0

Environment info

System:
      OS: macOS 15.5
      Shell: 5.9 - /bin/zsh
    Binaries:
      Node: 22.11.0 - ~/.nvm/versions/node/v22.11.0/bin/node
      npm: 10.9.0 - ~/.nvm/versions/node/v22.11.0/bin/npm
      Watchman: 2024.12.02.00 - /opt/homebrew/bin/watchman
    Managers:
      CocoaPods: 1.16.2 - /usr/local/opt/ruby/bin/pod
    SDKs:
      iOS SDK:
        Platforms: DriverKit 24.5, iOS 18.5, macOS 15.5, tvOS 18.5, visionOS 2.5, watchOS 11.5
    IDEs:
      Xcode: 16.4/16F6 - /usr/bin/xcodebuild
    npmPackages:
      expo: ~54.0.27 => 54.0.27 
      expo-router: ~6.0.17 => 6.0.17 
      react: 19.1.0 => 19.1.0 
      react-dom: 19.1.0 => 19.1.0 
      react-native: 0.81.5 => 0.81.5 
      react-native-web: ^0.21.0 => 0.21.2 
    npmGlobalPackages:
      eas-cli: 16.28.0
    Expo Workflow: bare

Steps to reproduce

Steps to Reproduce

Install react-native-bottom-tabs in a React Native project with Xcode 16.4+

Build iOS project
Observe compilation fails with Swift errors

Expected Behavior
The project should compile successfully without Swift type inference errors.

Actual Behavior
Compilation fails with the following Swift compiler errors:

❌  (node_modules/react-native-bottom-tabs/ios/TabView/NewTabView.swift:100:4)
  100 |   @Environment(\.tabViewBottomAccessoryPlacement) var tabViewBottomAccessoryPlacement
      |    ^ generic parameter 'T' could not be inferred

❌  (node_modules/react-native-bottom-tabs/ios/TabView/NewTabView.swift:100:16)
  100 |   @Environment(\.tabViewBottomAccessoryPlacement) var tabViewBottomAccessoryPlacement
      |                ^ cannot infer key path type from context; consider explicitly specifying a root type

Code Location

The error occurs in node_modules/react-native-bottom-tabs/ios/TabView/NewTabView.swift, lines 98-103:

swift
@available(iOS 26.0, *)
struct BottomAccessoryRepresentableView: PlatformViewRepresentable {
  @Environment(\.tabViewBottomAccessoryPlacement) var tabViewBottomAccessoryPlacement // Line 100
  var view: PlatformView
  
  func makeUIView(context: Context) -> PlatformView {
    // ...
  }
}

Note from the reporter:

I'm not very familiar with Swift/SwiftUI development, so I don't know what more to provide here. I'm happy to provide more details, logs, or help test any proposed solutions to resolve this issue!

[abisalde]

Related to mine too with

- react-native: '0.81.5'
- XCode: '16.4'
- "react-native-bottom-tabs": '1.1.0',

[wielski]

Same error.
On XCode 26, with 17.x target, could not built tvos app with latest library, TabViewBottomAccessoryPlacement is available on tvOS 26+ only