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Passing Parameter From a View Back To another View's UITableView's Cell
@interface Smoke_ApplicationAppDelegate : NSObject {

  UIWindow *window;
  UINavigationController *navigationController;
  NSString *messageString;  //This would be your String Variable
}
 @property(nonatomic,retain)NSString *messageString;

@implementation Smoke_ApplicationAppDelegate

@synthesize window;
@synthesize navigationController;
@synthesize messageString; // Synthesize it over here..

import "DelegateFile.h"

@implementation About

DelegateFile *appDel;

-(void)viewDidLoad { [super viewDidLoad];

appDel=[[UIApplication sharedApplication]delegate];

}

appDel.messageString

@protocol SecondViewControllerDelegate
- (void) viewControllerWillDisappearWithLabelText: (NSString*)text;
@end

//in the .h file
@interface SecondViewController : UIViewController {
    //declare instance variables
}
@property(nonatomic, assign) id<SecondViewControllerDelegate> delegate;
@end

//in the .m file
@implementation SecondViewController

@synthesize delegate;

//[code...]
@end

//in the .h file
@interface FirstViewController : UIViewController<SecondViewControllerDelegate> {
    //[instance variables]
}
//[methods and properties]
@end

//in the .m file
@implementation FirstViewController
//[code...]

- (void) viewControllerWillDisappearWithLabelText: (NSString*)text {
    //do whatever you need to do with the text
}

//[code...]
@end

SecondViewController* sv = [[SecondViewController alloc] init];
sv.somestring = someanotherstring;
sv.delegate = self;

- (void) viewWillDisappear: (bool)animated {
    [super viewWillDisappear:animated];
    if (self.delegate) {
        [self.delegate viewControllerWillDisappearWithLabelText: myLabel.text];
    }
}