Authentication *auth;

// This authenticates to SharePoint Online
auth = [[SPOAuthentication alloc] initWithUsernamePasswordSite:username password:password site:siteUrl];

// This authenticates using FBA
auth = [[FormsAuth alloc] initWithUsernamePasswordSite:username password:password site:siteUrl];
[auth setAuthdelegate:self];
[auth authenticate];

- (void)authentication: (SPAuthentication *)didAuthenticate
{
  // Do something cool now we're logged in
}

- (void)authentication: (SPAuthentication *)didFailWithError: (NSError *)error
{
  // Do something helpful as Auth failed for some reason.
}

NSString* urlRequest = @"http://somesharepointsite/sites/myweb/_api/web/Title";
NSString* requestIdStr = @"TitleRequest"
NSMutableString* requestMethod = @"GET"

RemoteQuery* query = [[RemoteQuery alloc] initWithUrlRequestId:urlRequest id:requestId];
[query setDelegate:self];
[query setRequestMethod:requestMethod];
[query setIncludeFormDigest:false];

[query executeQuery];

NSString* urlRequest = @"http://somesharepointsite/sites/TeamSite/_vti_bin/Lists.asmx";
NSString* requestIdStr = @"AllListsRequest";
NSMutableString* requestMethod = @"POST";
NSString* payload = @"<<FULL SOAP PACKET OF REQUEST HERE>>";
NSString* soapAction = @"http://schemas.microsoft.com/sharepoint/soap/GetListCollection";

RemoteQuery* query = [[RemoteQuery alloc] initWithUrlRequestId:urlRequest id:requestId];
[query setDelegate:self];
[query setRequestMethod:requestMethod];
[query setIncludeFormDigest:false];

if([payload length] > 0)
    [query setPayload:payload];

if([soapAction length] > 0)
    [query setSoapAction:soapAction];

[query executeQuery];

- (void)RemoteQuery:(id)RemoteQuery didCompleteQueryWithRequestId:(NSString *)result requestId:(NSString *)requestId
{
  // Do something here with 'result', it contains the response as a string
  // requestID can be used to differentriate multiple queries that happen in quick succession
}

- (void)RemoteQuery: (id)RemoteQuery didCompleteWithAuthFailure:(NSError *)error
{
  // Either bail back to the client (probably easier) or internally log back in and re-try the query.
  // If we did the latter, it might be difficult to feedback to the client the extra delay.
}

- (void)RemoteQuery: (id)RemoteQuery didCompleteWithFailure:(NSError *)error
{
  // Handle (nicely) the fact that the query failed for some reason.
  // Note that this (should) happens when you have anything other than a 200 or a redirect.
}