linker command failed with exit code 1 (use -v to see invocation)

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Undefined symbols for architecture arm64:

  "_OBJC_CLASS_$_NSManagedObjectContext", referenced from:

      objc-class-ref in AppDelegate.o

  "_OBJC_CLASS_$_NSPersistentStoreCoordinator", referenced from:

      objc-class-ref in AppDelegate.o

  "_OBJC_CLASS_$_NSManagedObjectModel", referenced from:

      objc-class-ref in AppDelegate.o

  "_NSSQLiteStoreType", referenced from:

      -[AppDelegate persistentStoreCoordinator] in AppDelegate.o

ld: symbol(s) not found for architecture arm64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

linker command failed with exit code 1 (use -v to see invocation)

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原文地址：http://www.cnblogs.com/royi123/p/5470784.html