how to pass a string value from one controller to another - iphone

Question

I have a login controller ,and after the successful login i want to pass some string value to the menu page.however it does not work.the application crashes.
I have tried possible suggesstion of Ihuk and SAM from the link below
how to pass a string value from one view controller to another view controller
loginController.h:
#import <UIKit/UIKit.h>
#class RootViewController;
#class Menu;
#interface LoginController : UIViewController {
UIButton *login_Button;
UITextField *username_TextField;
UITextField *password_TextField;
RootViewController *mc1;
UINavigationController *navigationController;
Menu *mv1;
}
#property(nonatomic,retain) IBOutlet UIButton *login_Button;
#property(nonatomic,retain) IBOutlet UITextField *username_TextField;
#property(nonatomic,retain) IBOutlet UITextField *password_TextField;
#property(nonatomic,retain) RootViewController *mc1;
#property (nonatomic, retain) IBOutlet
UINavigationController *navigationController;
#property(nonatomic,retain)Menu *mv1;
- (IBAction)Login_Method:(id)sender;
-(id)initWithUserName:(NSString *)name ;
#end
loginController.m
#import "LoginController.h"
#import "Menu.h"
#import "ViewController.h"
#import "RootViewController.h"
#implementation LoginController
#synthesize mc1,mv1;
#synthesize login_Button,username_TextField,password_TextField;
#synthesize navigationController;
// Implement viewDidLoad to do additional setup after
// loading the view, typically from a nib.
- (void)viewDidLoad {
if (![self.navigationController isNavigationBarHidden])
[self.navigationController setNavigationBarHidden:YES animated:NO];
//[self presentModalViewController:navigationController animated:YES];
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (IBAction)Login_Method:(id)sender
{
Menu *mv2 = [[Menu alloc] initWithUserName:#"Menu" bundle:nil];
//mv2.l1.text=#"aa"; //i tried this, but not work,so created initWithUserName
self.mv1=mv2;
[self presentModalViewController:mv1 animated:YES];
// [RootViewController release];
}
-(id)initWithUserName:(NSString *)name
{
self = [super init];
if (nil == self) {
return nil;
}
// display or store login info somewhere
[mv1.l1 setText:name];
return self;
}
-(BOOL)textFieldShouldReturn:(UITextField *)theTextField {
[theTextField resignFirstResponder];
return YES;
}
- (void)dealloc {
[username_TextField release];
[password_TextField release];
[super dealloc];
}
#end
Menu.h
#import <UIKit/UIKit.h>
#class Menu;
#interface Menu : UIViewController {
UILabel *l1;
UIButton *AccountSummary_Button;
UIButton *PayOffQuote_Button;
UIButton *PayBill_Button;
UIButton *Logout_Button;
UINavigationController *nv1;
}
#property(nonatomic,retain) IBOutlet UILabel *l1;
#property(nonatomic,retain) IBOutlet UIButton *AccountSummary_Button;
#property(nonatomic,retain) IBOutlet UIButton *PayOffQuote_Button;
#property(nonatomic,retain) IBOutlet UIButton *PayBill_Button;
#property(nonatomic,retain) IBOutlet UIButton *Logout_Button;
#property (nonatomic, retain) IBOutlet UINavigationController *nv1;
-(IBAction)ViewAccountSummary_method:(id)sender;
-(IBAction)ViewPayOffQuote_method:(id)sender;
-(IBAction)ViewPayBill_method:(id)sender;
-(IBAction)Logout_method:(id)sender;
#end
Menu.m

Answer 1

Make a property in your application delegate, for example, an NSString* called myString.
Then access it from the login controller and other controllers like so:
[[UIApplication sharedApplication] delegate].myString
You could, for example, set myString's value in the login controller:
[[UIApplication sharedApplication] delegate].myString = #"value";
You could read it in any other controller:
NSLog(#"myString is: %#", [[UIApplication sharedApplication] delegate].myString);
Additionally, some Cocoa style tips:
Do not capitalize class members (AccountSummary_Button etc.)
Do not capitalize class methods (ViewAccountSummary_method etc.)
The only thing you should capitalize are the classes themselves (Menu etc.).