// get all your layers

[client getLayersWithCursor:nil // for pagination
                   callback:[SGCallback callbackWithSuccessBlock:
                             ^(id response) {
                                 // you've got layers!
                                 // To create an array of SGLayer objects...
                                 NSArray *layers = [NSArray arrayWithSGCollection:SGCollectionTypeLayers];
                             } failureBlock^(NSError *error) {
                                 // handle failure
                             }]];