iOS端Facebook登录跳转至错误应用的技术问题求助

Let's break down your problem into two distinct issues and walk through practical fixes for each:

1. Login Redirects to Unrelated App (Sweatt) When Using Facebook App #

This is almost certainly a URL scheme conflict unique to iOS 9's handling of app routing. Here's the breakdown and fixes:

• iOS 9 prioritizes URL scheme registrations in a way that can cause collisions if multiple apps claim similar schemes. It sounds like Sweatt registered a URL scheme overlapping with Facebook's login callback (e.g., a fb-prefixed scheme that your app uses for Facebook login), leading the system to misroute the flow.
• Steps to resolve:
  • Double-check your app's Info.plist: Ensure your CFBundleURLSchemes entry is exactly fb<YOUR_FACEBOOK_APP_ID> (no typos, no extra characters). This ensures the system correctly routes Facebook login callbacks back to your app.
  • If users need to keep Sweatt installed, advise them to check Settings > Sweatt (if available) for any Facebook/URL handling permissions—though this is rarely configurable. Alternatively, reach out to the Sweatt dev team to confirm if they're using a conflicting URL scheme.
  • Confirm you're using a Facebook SDK version compatible with iOS 9. Newer SDKs (v6+) dropped iOS 9 support, so roll back to v5.x if you're on a newer build.

2. "Return to Facebook" Button Displays Incorrectly After Uninstalling Sweatt #

Once the redirect issue is fixed, the broken button text is likely a resource loading or SDK compatibility quirk on iOS 9:

• Possible causes:
  • The Facebook SDK's localized string resources (which power the button text) aren't properly bundled in your app, or iOS 9 fails to load them correctly.
  • iOS 9's UI rendering engine truncates or fails to display the full button text due to layout constraints or SDK bugs.
• Fixes to try:
  • Verify that FacebookSDKStrings.bundle (or the SDK's equivalent resource bundle) is fully imported into your Xcode project and included in your app's target.
  • Replace the SDK's default button with a custom one: After successful login, create your own button with explicit text (e.g., "Back to [Your App Name]") and handle navigation back to your app directly, bypassing the SDK's built-in button.
  • Check your app's localization settings: Ensure you've included the language localizations matching the user's device, so the SDK can pull the correct string resources.

内容的提问来源于stack exchange，提问作者Felipe Ferri