Navigation in iOS using Objective-C - ios

Question

i have an ios app which uses a login page and after authenticating it enters into the inbox page.But after entering the inbox page it comes back automatically to the login page
Login.m
{
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
{
NSString *query = [NSString stringWithFormat:#"SELECT * FROM Login_Info WHERE username='%#'",username]; // Execute the query.
NSLog(#" query = %#", query );
// Get the results.
if (self.arrLogin_Info != nil) {
self.arrLogin_Info = nil;
}
self.arrLogin_Info = [[NSArray alloc] initWithArray:[self.dbManager loadDataFromDB:query]];
[def setObject:[self.arrLogin_Info objectAtIndex:0] forKey:#"idKey"];
[def setObject:[self.arrLogin_Info objectAtIndex:1] forKey:#"usernameKey"];
[def setObject:[self.arrLogin_Info objectAtIndex:2] forKey:#"passwordKey"];
[def setObject:[self.arrLogin_Info objectAtIndex:3] forKey:#"emailKey"];
NSLog(#" query output = %#", self.arrLogin_Info);
NSString *val = [self.arrLogin_Info objectAtIndex:2];
// NSLog(#" val = %#",val);
if ([val isEqualToString:password] )
{
// NSLog(#" Inside if before entering app");
[self.navigationController popToRootViewControllerAnimated:YES];
}
else
{
//NSLog(#" Inside else before entering app");
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:#"Sorry!"
message:#"Please ensure you have entered the correct password!"
delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alertView show];
}
}
}
#end
Inbox.m
-(void) viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
id u = [def objectForKey:#"idkey"];
if(u)
{
NSString *query = [NSString stringWithFormat:#"Select *from Messages where recipient_ID=%#",u];
self.msg = [[NSArray alloc] initWithArray:[self.dbManager loadDataFromDB:query]];
// [self.tableView reloadData];
}
else
{
[self performSegueWithIdentifier:#"showLogin" sender:self];
}
// [self.tableView reloadData];
}
- (IBAction)logout:(id)sender {
//[PFUser logOut];
[self performSegueWithIdentifier:#"showLogin" sender:self];
}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if([segue.identifier isEqualToString:#"showLogin" ])
{
[segue.destinationViewController setHidesBottomBarWhenPushed:YES];
}
}

Answer 1

Your Inbox view controller uses the presence of an object for the key 'idkey' in NSUserDefaults to determine whether the user is already logged in, or whether to show the login screen.
I presume that this line in login.m
[def setObject:[self.arrLogin_Info objectAtIndex:0] forKey:#"idKey"];
is supposed to be setting that key, but you don't show where you initialise def - so my guess is that this is nil and you aren't saving the data in NSUserDefaults.
Also, all of this -
if (self.arrLogin_Info != nil) {
self.arrLogin_Info = nil;
}
self.arrLogin_Info = [[NSArray alloc] initWithArray:[self.dbManager loadDataFromDB:query]];
can be simplified to this
self.arrLogin_Info = [self.dbManager loadDataFromDB:query];