iOS login segue fix - ios

Question

This is the success parameter to my login which is under the closing bracket in viewDidload
//check whether it's a login or register
NSString* command = (sender.tag==1)?#"register":#"login";
NSMutableDictionary* params =[NSMutableDictionary dictionaryWithObjectsAndKeys:command, #"command", fldUsername.text, #"username", hashedPassword, #"password", nil];
//make the call to the web API
[[API sharedInstance] commandWithParams:params onCompletion:^(NSDictionary *json) {
//result returned
NSDictionary* res = [[json objectForKey:#"result"] objectAtIndex:0];
if ([json objectForKey:#"error"]==nil && [[res objectForKey:#"IdUser"] intValue]>0) {
[[API sharedInstance] setUser: res];
[self.presentingViewController dismissViewControllerAnimated:YES completion:nil];
//show message to the user
[[[UIAlertView alloc] initWithTitle:#"Logged in" message:[NSString stringWithFormat:#"Welcome %#",[res objectForKey:#"username"]] delegate:nil cancelButtonTitle:#"Close" otherButtonTitles: nil] show];
} else {
//error
[UIAlertView error:[json objectForKey:#"error"]];
}
}];
}
And this is the programatic connection in the view that I want to show when the user is authorized
-(void)viewDidload
[super viewDidLoad];
{
if (![[API sharedInstance] isAuthorized]) {
[self performSegueWithIdentifier:#"ShowLogin" sender:nil];
}
The problem is when I enter saved logged in credentials in my database (i.e. username: user1 password: password) I get the correct UIAlert I'm supposed to receive (Logged in - Welcome user1). But when i enter (username:user1 password: fake password) I still get the logged in UIAlert. Also if i try to register a new user from the app i.e. (username:user2 password: password 2) I get an authentication failed UIAlert. Also my segue doesn't actually happen when I enter valid credentials. Any tips?
Updated: logout delegate
-(void)logout {
//logout the user from the server, and also upon success destroy the local authorization
[[API sharedInstance] commandWithParams:[NSMutableDictionary dictionaryWithObjectsAndKeys:#"logout", #"command", nil] onCompletion:^(NSDictionary *json) {
//logged out from server
[API sharedInstance].user = nil;
[self performSegueWithIdentifier:#"ShowLogin" sender:nil];
}];
}

Answer 1

[[API sharedInstance] commandWithParams:params onCompletion:^(NSDictionary *json) {
//result returned
NSDictionary* res = [[json objectForKey:#"result"] objectAtIndex:0];
if ([json objectForKey:#"error"]==nil && [[res objectForKey:#"IdUser"] intValue]>0) {
[[API sharedInstance] setUser: res];
[API sharedInstance].isAuthorized = YES; //Added
[self.presentingViewController dismissViewControllerAnimated:YES completion:nil];
//show message to the user
[[[UIAlertView alloc] initWithTitle:#"Logged in" message:[NSString stringWithFormat:#"Welcome %#",[res objectForKey:#"username"]] delegate:nil cancelButtonTitle:#"Close" otherButtonTitles: nil] show];
} else {
[[API sharedInstance] setUser: nil]; //Added
[API sharedInstance].isAuthorized = NO; //Added
//error
[UIAlertView error:[json objectForKey:#"error"]];
}
}];
Find the lines with inline comments //Added and try those in your code. Also as mentioned update login view -> viewWillAppear and logout method.
Hope this helps.