annotateFeature.m

// annotate a feature

[client annotateFeature:@"SG_7L9nQHjsporBjZUz8KVt5t"
         withAnnotation:annotationDictionary
              isPrivate:NO
               callback:[SGCallback callbackWithSuccessBlock:
                         ^(id response) {
                             // annotation confirmed
                         } failureBlock:^(NSError *error) {
                             // annotation failed
                         }]];