Reload data after logging in - ios

Question

I have a left slide menu powered by AMSlideMenu library that displays a tableview with menu items.
AMSlideMenuLeftTableViewController.m
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"Cell"];
cell.textLabel.font = [UIFont fontWithName:#"HelveticaNeue-Light" size:18];
cell.textLabel.textColor = [UIColor whiteColor];
cell.backgroundColor = [UIColor clearColor];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
if ([[NSUserDefaults standardUserDefaults] objectForKey:#"loggedUser"] != nil) {
if (indexPath.row == 0) { cell.textLabel.text = [NSString stringWithFormat:#"Hi, %#", [[NSUserDefaults standardUserDefaults] objectForKey:#"loggedUser"]]; }
if (indexPath.row == 1) { cell.textLabel.text = #"Contact"; }
} else {
if (indexPath.row == 0) { cell.textLabel.text = #"Log in"; }
if (indexPath.row == 1) { cell.textLabel.text = #"Contact"; }
}
}
LoginViewController.m
- (IBAction)loginButtonPressed:(id)sender {
if(![self.usernameTextField.text isEqual: #""] && ![self.passwordTextField.text isEqual:#""]){
for (UITextField *eachTextfield in self.view.subviews)
[eachTextfield resignFirstResponder];
PFQuery *query = [PFQuery queryWithClassName:#"UsersClass"];
[query whereKey:#"Username" equalTo:self.usernameTextField.text];
[query whereKey:#"Password" equalTo:self.passwordTextField.text];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
// The find succeeded.
if (objects.count > 0){
[self dismissViewControllerAnimated:YES completion:nil];
//Get the username and save it as "loggedUser" for later use
[[NSUserDefaults standardUserDefaults] setObject:self.usernameTextField.text forKey:#"loggedUser"];
[[NSUserDefaults standardUserDefaults] synchronize];
[self performSegueWithIdentifier:#"showDetail" sender:self];
}else{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:#"Error" message:NSLocalizedString(#"The username or password are incorrect", nil) delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alert show];
}
} else {
// Log details of the failure
NSLog(#"Error: %# %#", error, [error userInfo]);
}
}];
}else{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:#"Error" message:NSLocalizedString(#"Both fields are required", nil) delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alert show];
}
However, after logging in, the menu does not refresh and keeps displaying the wrong cell.textLabel.text. It works if I close and open again the application, but obviously there has to be another way of solving this.
I have tried [tableView reloadData] but this does not work. I have tried it on viewDidLoad and viewWillAppear without success.
Appreciate any help. Thanks

Answer 1

Here is what you need to do. In your loginButtonPressed method in case of a successful login post a notification like this:
NSNotification *loginNotification = [NSNotification notificationWithName:#"USER_DID_LOGIN" object:nil];
[[NSNotificationCenter defaultCenter] postNotification:loginNotification];
In your view controller with tableView do this:
- (void)viewDidLoad
{
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(updateOnLogin:) name:#"USER_DID_LOGIN" object:nil];
}
- (void)updateOnLogin:(NSNotification*)notification
{
dispatch_async(dispatch_get_main_queue(), ^{
[self.tableView reloadData];
});
}
Whenever user logs in successfully, your view controller will receive a notification, and it will reload the tableView.