Passing data to next view controller - ios

Question

I am tryin to pass the user login emial to other view controllers. It is going from a UITextField to a UILabel but it display null when I log in a user. I want it to display the email name in the UILabel field. Any help? here are my files.
vc1.h
#import <UIKit/UIKit.h>
#interface loginUserViewController : UIViewController
#property (nonatomic, strong) IBOutlet UITextField *email;
#property (nonatomic, retain) IBOutlet UITextField *password;
#property (nonatomic, retain) IBOutlet UIButton *login;
#property (nonatomic,retain) IBOutlet UIButton *registerBtn;
-(IBAction)loginUser:(id)sender;
#end
vc2.h
#import <UIKit/UIKit.h>
#import "loginUserViewController.h"
#interface Home : UIViewController
#property (weak, nonatomic) IBOutlet NSString *getEmail;
#property (weak, nonatomic) IBOutlet UILabel *username;
#property (weak, nonatomic) IBOutlet UIBarButtonItem *Nav;
#property (weak, nonatomic) IBOutlet UIBarButtonItem *logout;
-(IBAction)logout:(id)sender;
-(IBAction)bandHome:(id)sender;
#end
vc2.m
import "Home.h"
#import "loginUserViewController.h"
#interface Home ()
#end
#implementation Home
#synthesize getEmail,username, band1, band2, band3;
-(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if(self){
}
return self;
}
-(void)viewDidLoad
{
[super viewDidLoad];
// loginUserViewController *object = [[loginUserViewController alloc]init];
// NSString *string = [[NSString alloc] initWithFormat:#"%#", object.email.text];
username.text = getEmail;
}
vc1.m
#import "loginUserViewController.h"
#import "Home.h"
#import "createBandViewController.h"
#interface loginUserViewController ()
#end
#implementation loginUserViewController
#synthesize email, password;
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
}
- (void)viewDidload
{
[super viewDidLoad];
}
-(IBAction)loginUser:(id)sender {
if ([email.text isEqualToString:#""] || [password.text isEqualToString:#""])
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"alert" message:#"Please Fill all the field" delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
return;
}
NSMutableString *strURL = [[NSMutableString alloc] initWithFormat:#"Pretend reference/login2.php?email=%#&password=%#", email.text, password.text ];
[strURL setString:[strURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSData *dataURL = [NSData dataWithContentsOfURL:[NSURL URLWithString:strURL]];
NSMutableString *strResult = [[NSMutableString alloc] initWithData:dataURL encoding:NSUTF8StringEncoding];
NSLog(#"logging in");
if ([strResult isEqualToString:#"1"])
{
NSLog(#"Logged in!");
[self performSegueWithIdentifier:#"login" sender:self];
Home *VC;
VC = [self.storyboard instantiateViewControllerWithIdentifier:#"Home"];
[self.navigationController pushViewController:VC animated:YES];
VC.getEmail = self.email.text;
}else
{
// invalid information
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"alert" message:#"Invalide Information" delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alert show];
return;
}
//email.text = #"";
password.text = #"";
}
-(void)WillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
// Dismisses keyboard by clicking out and hitting return key.
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
[self.view endEditing:YES];
}
-(BOOL)textFieldShouldReturn:(UITextField *) textField {
[textField resignFirstResponder];
return YES;
}
#end

Answer 1

vc2.h
#property (weak, nonatomic) IBOutlet NSString *getEmail;
vc2.m
#synthesize getEmail;
-(void)viewDidLoad
{
[super viewDidLoad];
username.text = getEmail;
}
vc1.m
-(IBAction)loginUser:(id)sender {
if ([email.text isEqualToString:#""] || [password.text isEqualToString:#""])
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"alert" message:#"Please Fill all the field" delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
return;
}
else
{
vc2 *VC;
VC = [self.storyboard instantiateViewControllerWithIdentifier:#"vc2Identifier"];
[self.navigationController pushViewController:VC animated:YES];
VC.getEmail = self.email.text
}
}
You don't need to alloc and init the view controller where you have to get the data , but you have to pass the data from vc1 to vc2 and use the variable of vc2 in vc1 , And what your were doing was using the vc1 value in vc2 . And you were allocating the LoginViewController , and in viewDidUnload method , you have set email textfield as nil . that is why you were getting nil value in vc2