how do i get one user input value form one ViewController, to appear in another? (extern/global variables?) - xcode

Question

i have a set up 2 sets of Objective-C classes (no xib file)
AdultTicketCalculatorViewController
//.h file
#import <UIKit/UIKit.h>
#interface AdultTicketCalculatorViewController : UIViewController {
IBOutlet UITextField *Quantity;
IBOutlet UILabel *Pricelabel;
IBOutlet UILabel *TotalLabel;
}
-(IBAction)calculate;
-(IBAction)clear;
#end
//.m
#import "AdultTicketCalculatorViewController.h"
#interface AdultTicketCalculatorViewController ()
#end
#implementation AdultTicketCalculatorViewController
-(IBAction)calculate {
float x = ([Quantity.text floatValue]);
float c = x*15;
TotalLabel.text = [[NSString alloc] initWithFormat:#"$%.2f", c];
}
-(IBAction)clear {
Quantity.text =#"";
Pricelabel.text =#"$15.00";
TotalLabel.text =#"";
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[Quantity resignFirstResponder];
}
AdultPayNowViewController
//.h
#import <UIKit/UIKit.h>
#interface AdultPayNowViewController : UIViewController {
IBOutlet UILabel *Quantity ,*Price ,*QuantitySpace ,*TotalSum ,*TotalSumSpace;
IBOutlet UIButton *ConfirmPurchase;
}
#end
//.m
(i havent implemented anything yet)
i want to take some user input and calculated values form AdultTicketCalculator and display them within AdultPayNowViewController in the following manner :
UITextField 'Quantity' (AdultTicketCalculatorViewController) to appear in UILabel 'QuantitySumSpace (AdultPayNowViewController)
UILabel 'TotalLabel' (AdultTicketCalculatorViewController) to appear in UILabel 'TotalSumSpace'

Answer 1

you can achieve this one by using two different ways.
1.save the data whatever you want in AdultTicketCalculatorViewController this class in NSUserDefaults and retrieve the data in AdultPayNowViewController.
like this :
whenever pushing your view place this code or in
- (void)viewDidDisappear:(BOOL)animated{
//place here
}
in AdultTicketCalculatorViewController
NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
[defaults setObject: TotalLabel.text forKey:#"TotalLabel"];
[defaults setObject: Quantity.text forKey:#"Quantity"];
[defaults synchronize];
and re assign the textfield value in viewWillAppear method.
AdultPayNowViewController:
in viewWillAppear method place this following code.
NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
TotalSumSpace.text= [defaults valueForKey:#"TotalLabel"];
QuantitySumSpace.text= [defaults valueForKey:#"Quantity"];
2.Synthesize the string objects in AdultPayNowViewController and assign the values when you push the screen from AdultTicketCalculatorViewController.