addOrUpdateLayer.m

// add or update a layer

SGLayer *layer = [SGLayer layerWithName:@"com.simplegeo.example"
                                  title:@"Example Layer"
                            description:@"Created from SimpleGeo.framework"
                           callbackURLs:nil]]; // optional list of callback URLs

[client addOrUpdateLayer:layer
                callback:[SGCallback callbackWithSuccessBlock:
                          ^(id response) {
                              // addition/update confirmed
                          } failureBlock:^(NSError *error) {
                              // addition/update failed
                          }]];