gistfile1.m

+ (void)swapMethod:(SEL)origM withMethod:(SEL)newM inClass:(Class)class {
    Method origMethod = class_getInstanceMethod(class, origM);
    Method newMethod = class_getInstanceMethod(class, newM);
    if (class_addMethod(class, origM, method_getImplementation(newMethod), method_getTypeEncoding(newMethod))) {
        class_replaceMethod(class, newM, method_getImplementation(origMethod), method_getTypeEncoding(origMethod));
    } else {
        method_exchangeImplementations(origMethod, newMethod);
    }
}

+ (void)swizzleAPICalls {
    [HAWStubs swapMethod:@selector(getUserSearchResultsPage:search:delegate:)
           withMethod:@selector(stubGetUserSearchResultsPage:search:delegate:)
                 inClass:[HAWUserSearchClient class]];

    [HAWStubs swapMethod:@selector(getUserProfilePageForID:delegate:)
              withMethod:@selector(stubGetUserProfilePageForID:delegate:)
                 inClass:[HAWUserProfileClient class]];
    // and so on…
}