Swift 4+Xcode9.3集成Google登录iPad9.3跳转网页问题求助

Hey there, let's troubleshoot why your Google Sign-In works smoothly on iOS 11.3 iPhone but jumps to the web on iOS 9.3 iPad. Here are the key fixes to resolve this:

1. Ensure Proper URL Scheme & Query Scheme Configuration #

iOS 9 requires explicit declaration of URL schemes in your Info.plist for app-to-app communication—this is often the root cause of web fallback:

• Open your Info.plist as source code and add the following blocks (replace YOUR_GOOGLE_CLIENT_ID with your actual client ID from the Google Cloud Console):

  <!-- URL Scheme for Google Sign-In callback -->
  <key>CFBundleURLTypes</key>
  <array>
    <dict>
      <key>CFBundleTypeRole</key>
      <string>Editor</string>
      <key>CFBundleURLSchemes</key>
      <array>
        <string>com.googleusercontent.apps.YOUR_GOOGLE_CLIENT_ID</string>
      </array>
    </dict>
  </array>
  
  <!-- Allow querying Google's apps (required for iOS 9) -->
  <key>LSApplicationQueriesSchemes</key>
  <array>
    <string>googlechrome</string>
    <string>googlechromes</string>
    <string>com.googleusercontent.apps.YOUR_GOOGLE_CLIENT_ID</string>
  </array>
  

2. Update AppDelegate for iOS 9 Compatibility #

iOS 10 introduced a new open url delegate method, but iOS 9 relies on the older one. Make sure you implement both to cover all versions:

• Add this iOS 10+ method alongside your existing code:

  func application(_ application: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any]) -> Bool {
      return GIDSignIn.sharedInstance().handle(
          url,
          sourceApplication: options[.sourceApplication] as? String,
          annotation: options[.annotation]
      )
  }
  

• Fix your existing iOS 9 method to pass the annotation parameter correctly (your snippet had an ellipsis):

  func application(_ application: UIApplication, open url: URL, sourceApplication: String?, annotation: Any) -> Bool {
      let googleDidHandle = GIDSignIn.sharedInstance().handle(
          url,
          sourceApplication: sourceApplication,
          annotation: annotation
      )
      return googleDidHandle
  }
  

3. Use a Google Sign-In SDK Version Compatible with iOS 9 #

Newer versions of the Google Sign-In SDK drop support for iOS 9. Double-check your dependency setup:

• If using CocoaPods, ensure your Podfile specifies a version that supports iOS 9:

  pod 'GoogleSignIn', '~> 4.0' # Version 4.x maintains iOS 9 compatibility
  

• Run pod update GoogleSignIn to install the latest compatible version.

4. Confirm Native App Preference is Enabled #

By default, Google Sign-In prefers the native Google app if installed, but it's good to set this explicitly in your app's launch setup:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    GIDSignIn.sharedInstance().clientID = "YOUR_GOOGLE_CLIENT_ID"
    // Ensure basic profile fetch is enabled (default is true, but explicit avoids surprises)
    GIDSignIn.sharedInstance().shouldFetchBasicProfile = true
    return true
}

Most often, missing URL scheme configuration or incomplete delegate methods are the culprits here. Give these steps a test and let me know if you still hit issues!

内容的提问来源于stack exchange，提问作者Raj