fix: allow user to set their own callback for phone auth

Author: russellwheatley

FirebaseSwiftUI/FirebasePhoneAuthSwiftUI/Sources/Services/AuthService+Phone.swift

@@ -22,9 +22,18 @@
 import FirebaseAuthSwiftUI
 
 public extension AuthService {
+  /// Register phone sign-in with default behavior (navigates to enter phone number view)
   @discardableResult
   func withPhoneSignIn() -> AuthService {
-    registerProvider(providerWithButton: PhoneAuthProviderAuthUI())
+    return withPhoneSignIn { [weak self] in
+      self?.navigator.push(.enterPhoneNumber)
+    }
+  }
+
+  /// Register phone sign-in with custom behavior
+  @discardableResult
+  func withPhoneSignIn(onTap: @escaping @MainActor () -> Void) -> AuthService {
+    registerProvider(providerWithButton: PhoneAuthProviderAuthUI(onTap: onTap))
     return self
   }
 }

FirebaseSwiftUI/FirebasePhoneAuthSwiftUI/Sources/Services/PhoneAuthProviderAuthUI.swift

@@ -25,11 +25,15 @@ public class PhoneAuthProviderAuthUI: AuthProviderUI {
   public var provider: AuthProviderSwift { typedProvider }
   public let id: String = "phone"
 
-  public init() {
+  // Callback for when the phone auth button is tapped
+  private let onTap: @MainActor () -> Void
+
+  public init(onTap: @escaping @MainActor () -> Void) {
     typedProvider = PhoneProviderSwift()
+    self.onTap = onTap
   }
 
   @MainActor public func authButton() -> AnyView {
-    AnyView(PhoneAuthButtonView())
+    AnyView(PhoneAuthButtonView(onTap: onTap))
   }
 }

FirebaseSwiftUI/FirebasePhoneAuthSwiftUI/Sources/Views/PhoneAuthButtonView.swift

@@ -20,8 +20,11 @@ import SwiftUI
 @MainActor
 public struct PhoneAuthButtonView {
   @Environment(AuthService.self) private var authService
+  private let onTap: @MainActor () -> Void
 
-  public init() {}
+  public init(onTap: @escaping @MainActor () -> Void) {
+    self.onTap = onTap
+  }
 }
 
 extension PhoneAuthButtonView: View {
@@ -31,13 +34,15 @@ extension PhoneAuthButtonView: View {
       style: .phone,
       accessibilityId: "sign-in-with-phone-button"
     ) {
-      authService.navigator.push(.enterPhoneNumber)
+      onTap()
     }
   }
 }
 
 #Preview {
   FirebaseOptions.dummyConfigurationForPreview()
-  return PhoneAuthButtonView()
-    .environment(AuthService())
+  return PhoneAuthButtonView {
+    print("Phone auth tapped")
+  }
+  .environment(AuthService())
 }