gistfile1.m

RSServer *server = [RSServer blank];
server.name = @"ck-test";
server.flavorId = [[RSFlavor first] id];
server.imageId = [[RSImage first] id];

[server post:nil completionBlock:^(CKResult *result) {
    
    if ([result isSuccess]) {
        
        [self alert:@"success!"];
        
    } else {
        [self alert:@"fail in completionBlock!"];
    }
    
} errorBlock:^(CKResult *result) {
    
    [self alert:@"fail in errorBlock!"];
    
}];