Fix Swift compiler warnings

- ConnectButton: activate the orphaned lessThanOrEqualTo bottom
  constraint so its return value is not ignored.
- AuthenticationError: add .notInteractive, .matchedExcludedCredential,
  .credentialImport, .credentialExport to mirror the new
  ASAuthorizationError.Code cases Apple added in iOS 15.4 / 18 / 18.2.
- SignInWithAppleAuthentication: handle those new codes behind
  availability checks and map each 1:1 to the corresponding
  AuthenticationError so callers see the actual Apple-side reason
  rather than a generic .failed / .unknown bucket.

Author: ssathy2

IFTTT SDK/ConnectButton.swift

@@ -345,9 +345,10 @@ public class ConnectButton: UIView {
             footerLabel.constrain.edges(to: footerLabelContainer, edges: [.left, .top, .right])
 
             // But allow it to be shorter than its container
-            footerLabel.bottomAnchor.constraint(lessThanOrEqualTo: footerLabelContainer.bottomAnchor)
+            footerLabel.bottomAnchor.constraint(lessThanOrEqualTo: footerLabelContainer.bottomAnchor).isActive = true
             let breakableBottomConstraint = footerLabel.bottomAnchor.constraint(equalTo: footerLabelContainer.bottomAnchor)
             breakableBottomConstraint.priority = .defaultHigh
+            breakableBottomConstraint.isActive = true
 
             // Ask the label to keep its intrinsic height
             footerLabel.setContentHuggingPriority(.required, for: .vertical)

IFTTT SDK/SignInWithAppleAuthentication.swift

@@ -41,6 +41,27 @@ final class AppleSignInWebService: ServiceAuthentication {
         @available(iOS 13.0, *)
         func authorizationController(controller: ASAuthorizationController, didCompleteWithError error: Error) {
             let authorizationError = ASAuthorizationError(_nsError: error as NSError)
+            // Cases added after the SDK's iOS 14.2 deployment target.
+            // Each is referenced behind an availability check and mapped
+            // to the matching AuthenticationError case so callers can
+            // distinguish it from the generic .failed / .unknown bucket.
+            if #available(iOS 15.4, *), authorizationError.code == .notInteractive {
+                completion(.failure(.notInteractive))
+                return
+            }
+            if #available(iOS 18.0, *), authorizationError.code == .matchedExcludedCredential {
+                completion(.failure(.matchedExcludedCredential))
+                return
+            }
+            if #available(iOS 18.2, *), authorizationError.code == .credentialImport {
+                completion(.failure(.credentialImport))
+                return
+            }
+            if #available(iOS 18.2, *), authorizationError.code == .credentialExport {
+                completion(.failure(.credentialExport))
+                return
+            }
+
             switch authorizationError.code {
             case .canceled:
                 completion(.failure(.userCanceled))
@@ -50,6 +71,8 @@ final class AppleSignInWebService: ServiceAuthentication {
                 completion(.failure(.invalidResponse))
             case .notHandled:
                 completion(.failure(.notHandled))
+            case .presentationContextInvalid:
+                completion(.failure(.presentationContextInvalid))
             case .unknown:
                 completion(.failure(.unknown))
             @unknown default:

IFTTT SDK/WebServiceAuthentication.swift

@@ -14,13 +14,26 @@ import AuthenticationServices
 /// - invalidResponse: The response returned by the web service was invalid.
 /// - notHandled: The error wasn't handled by the web service.
 /// - presentationContextInvalid: The presentation content provided was invalid.
+/// - notInteractive: The authorization request was performed in a
+///   non-interactive context. Mirrors `ASAuthorizationError.Code.notInteractive`
+///   (iOS 15.4+).
+/// - matchedExcludedCredential: A matched credential was excluded from use.
+///   Mirrors `ASAuthorizationError.Code.matchedExcludedCredential` (iOS 18+).
+/// - credentialImport: An error occurred importing a credential. Mirrors
+///   `ASAuthorizationError.Code.credentialImport` (iOS 18.2+).
+/// - credentialExport: An error occurred exporting a credential. Mirrors
+///   `ASAuthorizationError.Code.credentialExport` (iOS 18.2+).
 /// - unknown: Some unknown error ocurred when authenticating with the web service.
 enum AuthenticationError: Error {
     case userCanceled
     case failed
     case invalidResponse
     case notHandled
     case presentationContextInvalid
+    case notInteractive
+    case matchedExcludedCredential
+    case credentialImport
+    case credentialExport
     case unknown
 }