Connect to secured server with synchronous way iOS - ios

Question

I want to know if there is a way to connect to a secured web service (web server requests username and password to connect and return data) with a synchronous way and how can I pass these two parameters in my code, I used this code :
-(void)performRequest{
NSURL * url =[[NSURL alloc] initWithString:#"http://firstluxe.com/api/tags/?display=[id,name]&output_format=JSON"];
NSURLRequest * request = [[NSURLRequest alloc] initWithURL:url];
NSURLConnection * connection =[[NSURLConnection alloc]initWithRequest:request
delegate:self];}
- (void)connection:(NSURLConnection *)connection willSendRequestForAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
{ NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
if ([challenge previousFailureCount] == 0)
{
NSURLCredential * cred = [NSURLCredential credentialWithUser: #"userName"
password: #"Password"
persistence: NSURLCredentialPersistenceForSession];
[[challenge sender] useCredential:cred forAuthenticationChallenge:challenge];
}
else
{
//You don't have authentication
}
}
-(BOOL)connectionShouldUseCredentialStorage:(NSURLConnection *)connection
{
return YES;
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
//handle errors
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
html = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
jsonFromAFNetworking = html;
NSLog(#" html is %# ",html);
}
It returns the value of from the server correctly, but when I do :
- (void)viewDidLoad {
[super viewDidLoad];
[self performRequest];
NSLog(#" jsonFromAFNetworking %#" , jsonFromAFNetworking);
}
I get null value, I know that it's because it is an asynchronous action, but I need to use the new value and I don't know how to do it, how can I tell the code to wait until the [self performRequest]is executed or how to connect to this server by another way?