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General Discussion

Posted by Natacha S
Natacha S
11,561 Points

code challenge : logging in (Ribbit app) 2/4

Here's the link to the challenge: http://teamtreehouse.com/library/logging-in-and-logging-out. And here's my code:

#import "MainViewController.h"
#import "LoginViewController.h"
#import <Parse/Parse.h>
@implementation MainViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    PFUser *currentUser =[PFUser currentUser];
    if ([currentUser logOut]){
    [self performSegueWithIdentifier:@"showLogin" sender:self];};
};

- (IBAction)logOut:(id)sender {

    [self performSegueWithIdentifier:@"showLogin" sender:self];
}

@end

I have no idea what i m doing wrong and i don't really understand the question, can someone help me ?

3 Answers

agreatdaytocode
agreatdaytocode
24,757 Points
agreatdaytocode
agreatdaytocode
24,757 Points

Here is what I add

#import "LoginViewController.h"
#import <Parse/Parse.h>

@interface LoginViewController ()

@end

@implementation LoginViewController


- (void)viewDidLoad
{
    [super viewDidLoad];

    self.navigationItem.hidesBackButton = YES;
}


- (IBAction)login:(id)sender {
    NSString *username = [self.usernameField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    NSString *password = [self.passwordField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

    if ([username length] == 0 || [password length] == 0) {
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Oops!"
                                                            message:@"Make sure you enter a username and password!"
                                                           delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alertView show];
    }
    else {

        [PFUser logInWithUsernameInBackground:username password:password block:^(PFUser *user, NSError *error) {
            if (error) {
                UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Sorry!"
                                                                    message:[error.userInfo objectForKey:@"error"]
                                                                   delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
                [alertView show];
            }
            else {
                [self.navigationController popToRootViewControllerAnimated:YES];
            }
        }];
    }
}

@end

Its been a few months, but I just tested the app and it works. Also make sure you add "showLogin" to the segue on the storyboard.

Natacha S
Natacha S
11,561 Points

yes i would use this if i were building the app but this is for the code challenge question...so this doesn't really work, they expect a much simpler answer i think.....

agreatdaytocode
agreatdaytocode
24,757 Points
agreatdaytocode
agreatdaytocode
24,757 Points

Sorry try this:

#import "MainViewController.h"
#import "LoginViewController.h"
#import <Parse/Parse.h>

@implementation MainViewController

- (void)viewDidLoad {
    [super viewDidLoad];


PFUser *currentUser = [PFUser currentUser];
if (currentUser) {
    // do stuff with the user
} else {
    // show the signup or login screen
}
}



- (IBAction)logOut:(id)sender {

    [self performSegueWithIdentifier:@"showLogin" sender:self];
}

@end
Natacha S
Natacha S
11,561 Points
Natacha S
Natacha S
11,561 Points

I solved this, basically the answer lies around the condition being currentUser==nil but thanks !

agreatdaytocode
agreatdaytocode
24,757 Points

The above code worked for me. Glad you figured it out : )

DeShawn Pellebon
DeShawn Pellebon
Courses Plus Student 1,350 Points

Can any of you help me out? Im stuck on this challenge