Undefined symbols for architecture i386: 问题

Undefined symbols for architecture i386:

  "_sqlite3_backup_finish", referenced from:

     _loadOrSaveDb in FMDatabase+InMemoryOnDiskIO.o

  "_sqlite3_backup_init", referenced from:

     _loadOrSaveDb in FMDatabase+InMemoryOnDiskIO.o

  "_sqlite3_backup_step", referenced from:

     _loadOrSaveDb in FMDatabase+InMemoryOnDiskIO.o

  "_sqlite3_bind_blob", referenced from:

     -[FMDatabase bindObject:toColumn:inStatement:] in FMDatabase.o

  "_sqlite3_bind_double", referenced from:

     -[FMDatabase bindObject:toColumn:inStatement:] in FMDatabase.o

  "_sqlite3_bind_int", referenced from:

     -[FMDatabase bindObject:toColumn:inStatement:] in FMDatabase.o

  "_sqlite3_bind_int64", referenced from:

     -[FMDatabase bindObject:toColumn:inStatement:] in FMDatabase.o

  "_sqlite3_bind_null", referenced from:

     -[FMDatabase bindObject:toColumn:inStatement:] in FMDatabase.o

  "_sqlite3_bind_parameter_count", referencedfrom:

     -[FMDatabaseexecuteQuery:withArgumentsInArray:orDictionary:orVAList:] inFMDatabase.o

     -[FMDatabaseexecuteUpdate:error:withArgumentsInArray:orDictionary:orVAList:] inFMDatabase.o

  "_sqlite3_bind_parameter_index", referencedfrom:

     -[FMDatabaseexecuteQuery:withArgumentsInArray:orDictionary:orVAList:] inFMDatabase.o

     -[FMDatabaseexecuteUpdate:error:withArgumentsInArray:orDictionary:orVAList:] inFMDatabase.o

解决方法：在Link Frameworks and Libraries 中加入libsqlite3.dylib ，添加后就可以编译通过。