This is how I use open source libraries like SPAsync, FormatterKit, SWTableViewCell and others within the Lookback SDK, without getting linking conflicts within apps that use the same libraries.

GFNamespace.h

// http://rentzsch.tumblr.com/post/40806448108/ns-poor-mans-namespacing-for-objective-c

// This namespacing method is used to namespace libraries used by Lookback, so
// that apps incorporating the SDK can have the same class in it without clashing.
// (ugh, give me swift nooow).

#ifndef GFNAMESPACE
// Default to using the 'GF' prefix
#define GFNAMESPACE GF
#endif

#define GFNSxstr(s) GFNSstr(s)
#define GFNSstr(s) #s

#define GFNAMESPACESTR GFNSxstr(GFNAMESPACE)

#define GFNS_CONCAT_TOKENS(a,b) a##b
#define GFNS_EVALUATE(a,b) GFNS_CONCAT_TOKENS(a,b)
#define NS(original_name) GFNS_EVALUATE(GFNAMESPACE, original_name)

// Usage: define GFNAMESPACE as a build setting in your library.
// Then, define classes like this:

@interface NS(NetworkClient) : NSObject
@end

// This will become GFNetworkClient if you don't define the constant, or
// ABCDNetworkClient inside your ABCD library. Use it like this:

NS(NetworkClient) *myClient = [[NS(NetworkClient) alloc] initWithStuff:hey];