ios - FacebookSDK 3.0 - Apple Mach-O 链接器错误

Question

我正在尝试在我的一个应用程序中实现 Facebook，因此遵循了 Hackbook 上的官方 Facebook 教程。 https://developers.facebook.com/docs/howtos/login-with-facebook-using-ios-sdk/

我按照描述实现了所有操作，没有收到任何错误或警告。但是，当我尝试构建该应用程序时，出现了 17 个 Mach-O 链接器错误。

Undefined symbols for architecture i386:
  "_FBSessionStateChangedNotification", referenced from:
      -[ForeverMainViewController sessionStateChanged:state:error:] in ForeverMainViewController.o
  "_sqlite3_bind_double", referenced from:
      -[FBCacheIndex _updateEntryInDatabaseForKey:entry:] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _writeEntryInDatabase:] in FacebookSDK(FBCacheIndex.o)
  "_sqlite3_bind_int", referenced from:
      -[FBCacheIndex _updateEntryInDatabaseForKey:entry:] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _writeEntryInDatabase:] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _trimDatabase] in FacebookSDK(FBCacheIndex.o)
  "_sqlite3_bind_text", referenced from:
      -[FBCacheIndex _updateEntryInDatabaseForKey:entry:] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _writeEntryInDatabase:] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _readEntryFromDatabase:] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _removeEntryFromDatabaseForKey:] in FacebookSDK(FBCacheIndex.o)
  "_sqlite3_close", referenced from:
      ___23-[FBCacheIndex dealloc]_block_invoke_0 in FacebookSDK(FBCacheIndex.o)
  "_sqlite3_column_double", referenced from:
      -[FBCacheIndex _readEntryFromDatabase:] in FacebookSDK(FBCacheIndex.o)
  "_sqlite3_column_int", referenced from:
      -[FBCacheIndex _readEntryFromDatabase:] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _fetchCurrentDiskUsage] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _trimDatabase] in FacebookSDK(FBCacheIndex.o)
  "_sqlite3_column_text", referenced from:
      -[FBCacheIndex _readEntryFromDatabase:] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _trimDatabase] in FacebookSDK(FBCacheIndex.o)
  "_sqlite3_errmsg", referenced from:
      _releaseStatement in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _updateEntryInDatabaseForKey:entry:] in FacebookSDK(FBCacheIndex.o)
      _initializeStatement in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _writeEntryInDatabase:] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _readEntryFromDatabase:] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _fetchCurrentDiskUsage] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _removeEntryFromDatabaseForKey:] in FacebookSDK(FBCacheIndex.o)
      ...
  "_sqlite3_exec", referenced from:
      ___36-[FBCacheIndex initWithCacheFolder:]_block_invoke_0 in FacebookSDK(FBCacheIndex.o)
  "_sqlite3_finalize", referenced from:
      _releaseStatement in FacebookSDK(FBCacheIndex.o)
  "_sqlite3_open_v2", referenced from:
      ___36-[FBCacheIndex initWithCacheFolder:]_block_invoke_0 in FacebookSDK(FBCacheIndex.o)
  "_sqlite3_prepare_v2", referenced from:
      _initializeStatement in FacebookSDK(FBCacheIndex.o)
  "_sqlite3_reset", referenced from:
      _initializeStatement in FacebookSDK(FBCacheIndex.o)
  "_sqlite3_step", referenced from:
      -[FBCacheIndex _updateEntryInDatabaseForKey:entry:] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _writeEntryInDatabase:] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _readEntryFromDatabase:] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _fetchCurrentDiskUsage] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _removeEntryFromDatabaseForKey:] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _dropTrimmingTable] in FacebookSDK(FBCacheIndex.o)
      -[FBCacheIndex _trimDatabase] in FacebookSDK(FBCacheIndex.o)
      ...
ld: symbol(s) not found for architecture i386

在重新实现、清理应用程序、确保一切都在那里之后，我没有主意了。我也在另一个应用程序中实现了它，但再次纠正了错误。然而，来自 Facebook 的给定样本按预期工作。我在互联网上做了各种提示，但到目前为止都没有用。也许这里有人对 API 有所了解并且对我有很好的提示:)

Answer 1

我认为你错过了这一行

NSString *const FBSessionStateChangedNotification = @"FBSessionStateChangedNotification";

并添加对 -lsqlite3.0 的引用

参见 https://developers.facebook.com/docs/getting-started/getting-started-with-the-ios-sdk/#project