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Build Notes

Building the Project

This is an iOS-only application that should be built using Xcode, not the Swift Package Manager command-line tools.

✅ To Build (Correct Method):

  1. Open Package.swift in Xcode
  2. Select an iOS target (device or simulator)
  3. Build and run (⌘R)

❌ Command-Line Build Issues:

Running swift build from the command line will show errors like:

error: the library 'RedoUI' requires macos 10.13, but depends on the product 'GoogleSignIn' which requires macos 10.15

This is a false error. Swift Package Manager's command-line tools try to validate cross-platform compatibility even though:

  • Package.swift specifies platforms: [.iOS(.v17)] (iOS-only)
  • The code uses iOS-specific APIs (UIKit, SwiftUI iOS modifiers)
  • GoogleSignIn is an iOS library

Why This Happens:

SPM's dependency resolution tries to ensure cross-platform compatibility, but our dependencies (Firebase, GoogleSignIn) have different platform requirements. When building in Xcode with an iOS target selected, these errors don't occur because Xcode correctly understands the iOS-only context.

iOS-Specific SwiftUI Modifiers Used:

The following SwiftUI modifiers are iOS-specific and will work in Xcode but may show as "unavailable" in SPM command-line builds:

  • .navigationBarTitleDisplayMode(.inline/.large)
  • .toolbar { ToolbarItem(placement: .navigationBarTrailing) { ... } }
  • .toolbar { ToolbarItem(placement: .navigationBarLeading) { ... } }
  • UITabBar.appearance()
  • UIViewController presentation APIs

These are standard iOS SwiftUI APIs and work perfectly when building for iOS in Xcode.

Summary

  • ✅ Xcode: Full iOS support, builds correctly
  • ❌ swift build: Cross-platform validation errors (can be ignored)
  • 🎯 Target Platform: iOS 17+