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iOS

Posted by busterlabs
busterlabs
9,276 Points

Using Parse.com - Logging In and Logging Out Code Challenge

Challenge Task 2 of 4

In viewDidLoad we see that the LoginViewController is presented automatically. Set the 'currentUser' variable using the appropriate method from the PFUser class. Then use that variable in an if statement to only perform the segue to LoginViewController if no user is logged in.

My Code:

import "LoginViewController.h"

import "UIAlertView.h"

import <Parse/Parse.h>

@implementation LoginViewController

  • (void)viewDidLoad { [super viewDidLoad]; }

  • (IBAction)login:(id)sender {

    void (^loginHandler)(PFUser *user, NSError *error) = ^(PFUser *user, NSError *error) { if (error) { UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Sorry!" message:@"Error logging in." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alertView show]; } else { [self.navigationController popToRootViewControllerAnimated:YES]; } };

    // Add your code below!

PFUser *currentUser = [PFUser currentUser]; if (error) { [self performSegueWithIdentifier:@"showLogin" sender:self]; }

@end

Result:

Bummer! Compilation Error! Make sure you are setting 'currentUser' like in the video, and make sure you added the 'if' statement correctly.

1 Answer

Andres Oliva
Andres Oliva
7,810 Points
Andres Oliva
Andres Oliva
7,810 Points

You are writing a wrong if statement.

You need something like this:

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

@implementation MainViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    PFUser *currentUser;
    currentUser = [PFUser currentUser];
    if (!currentUser) {
       [self performSegueWithIdentifier:@"showLogin" sender:self];
    }
}