SVProgressHud waits too long to dismiss - ios

Question

I want to display SVProgressHUD during login process. But SVProgressHUD still waits after login. It's dismissed ~15seconds after "Login success" message.
Here is my code:
[SVProgressHUD show];
__block BOOL result;
dispatch_async(queue, ^{
result = [self autanticate];
NSLog(#"autantication result = %d", result);
result = [self getCSRFToken];
NSLog(#"Login success result = %d", result);
[SVProgressHUD dismiss];
});
autanticate and getCSRFToken functions are like below:
- (BOOL) getCSRFToken
{
__block BOOL success = false;
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
// Make sure that the callbacks are not called from the main queue, otherwise we would deadlock
manager.requestSerializer = [AFJSONRequestSerializer serializer];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
NSDictionary *parameters = #{#"username": self.username.text,
#"password": self.password.text};
NSLog(#"Creating CSRF semaphore");
dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
// CSRF Token bilgisini alalım
NSString *Url = [NSString stringWithFormat:#"%#%#", BaseURLString, #"?q=services/session/token"];
[manager GET:Url parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(#"CSRF Token: %#", responseObject);
success = true;
dispatch_semaphore_signal(semaphore);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Error: %#", error);
success = false;
dispatch_semaphore_signal(semaphore);
}];
NSLog(#"Waiting CSRF semaphore");
dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
return success;
}
- (BOOL)autanticate
{
__block BOOL isAutanticated = false;
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.requestSerializer = [AFJSONRequestSerializer serializer];
manager.responseSerializer = [AFJSONResponseSerializer serializer];
NSDictionary *parameters = #{#"username": self.username.text,
#"password": self.password.text};
// Session bilgilerini alalım
NSLog(#"Creating autantication semaphore");
dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
NSString *Url = [NSString stringWithFormat:#"%#%#", BaseURLString, #"?q=rest/mserv/signin"];
[manager POST:Url parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(#"JSON: %#", responseObject);
NSDictionary *result = [responseObject objectForKey:#"result"];
NSString *sessid = [result objectForKey:#"sessid"];
NSString *session_name = [result objectForKey:#"session_name"];
NSLog(#"sessid = %#\nsession_name=%#", sessid, session_name);
isAutanticated = true;
dispatch_semaphore_signal(semaphore);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Error: %#", error);
isAutanticated = false;
dispatch_semaphore_signal(semaphore);
}];
NSLog(#"Waiting autanticatio semaphore");
dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
return isAutanticated;
}

Answer 1

You must dispatch [SVProgressHUD dismiss] to the main thread
[SVProgressHUD show];
__block BOOL result;
dispatch_async(queue, ^{
result = [self autanticate];
NSLog(#"autantication result = %d", result);
result = [self getCSRFToken];
NSLog(#"Login success result = %d", result);
dispatch_async(dispatch_get_main_queue(), ^{
[SVProgressHUD dismiss];
})
});
All user interface elements must only be modified on the main thread.
Remark: Note that the dispatch_async() returns
(almost) immediately, so that the result is not set
when dispatch_async() returns.
And don't be tempted to use a semaphore to wait for the block to finish.
That is fine on a background thread, but will most probably give a deadlock
on the main thread.