How to pass a value to anotherviewcontroller?

Question

Hello everybody, I have a UITableView in a UIViewController. When a row in the table is tapped I am collecting the cell's text value and putting it in a string called localstringGValue.

I want to pass this string and display it in another, viewController, but without using -pushViewController: I want this value to be stored somewhere like NSUserDefaults or NSDictonary and then, on viewWillapper of the other view controller I want this stored value to be displayed in a label.

in my .h:

 NSString *localStringGValue;

in my .m:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [tableView deselectRowAtIndexPath:indexPath animated:YES];

    localStringGValue = [tableView cellForRowAtIndexPath:indexPath].textLabel.text; 
}

in my other view controller:

-(void)viewWillAppear
{
    label.text=localStringGValue;
}

Thanks in advance.

simple case of delegate and protocols... iphonedevelopertips.com/objective-c/… — Ankit Srivastava
– Ankit Srivastava, Commented Dec 12, 2011 at 13:38

ader · Accepted Answer · 2011-12-12 15:07:01Z

2

save to nsuserdefaults:

[[NSUserDefaults standardUserDefaults] setObject:localstringGValue forKey:@"localstringGValue"];
[[NSUserDefaults standardUserDefaults] synchronize];

retrieve from nsuserdefaults:

NString *localstringGValue = [[NSUserDefaults standardUserDefaults] objectForKey:@"localstringGValue"];

answered Dec 12, 2011 at 15:07

ader

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2 Comments

Kjuly Over a year ago

Is that a good way to use NSUserDefaults for storing dynamic value?

ader Over a year ago

How would you define "good" in this context? It's just one way to use as and when you feel it's sensible. Sometimes I use a mix of notifications and delegates instead. However, mostly I use a distinct model class. For a small infrequent amount of data and a simple option nsuserdefaults can sometimes suffice. We all have to walk before we can run.

Kjuly · Accepted Answer · 2011-12-13 03:16:18Z

1

Just use delegate. Before you push the 'UploadViewController' instance, you need set it's delegate as self(in GoogleDocMainPageController.m). Everytime, the tabel cell is selected, it'll set value for self.delegate(Here is GoogleDocMainPageController instance) by dispatching self.delegate's method, which is implemented by GoogleDocMainPageController:

[self.delegate setDataAfterSelectedTabelCell:[NSString stringWithFormat:@"TalbeCell %d selected", [indexPath row]]];

The main code is shown below:
UploadViewController.h:

#import <UIKit/UIKit.h>

@class UploadViewController;

@protocol UploadViewControllerDelegate <NSObject>

- (void)setDataAfterSelectedTabelCell:(NSString *)stringValueInCell;

@end

@interface UploadViewController : UITableViewController

@property (nonatomic, retain) id <UploadViewControllerDelegate> delegate;

@end

UploadViewController.m:

//...
@synthesize delegate = _delegate;

//...
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [self.delegate setDataAfterSelectedTabelCell:[NSString stringWithFormat:@"TalbeCell %d selected", [indexPath row]]];
}

GoogleDocMainPageController.h:

#import <UIKit/UIKit.h>

#import "UploadViewController.h"

@class UploadViewController;

@interface GoogleDocMainPageController : UIViewController <UploadViewControllerDelegate>

- (void)loadUploadViewController;

@property (nonatomic, retain) UILabel * glLabel;
@property (nonatomic, retain) UploadViewController * uploadViewController;

@end

GoogleDocMainPageController.m:

//...
@synthesize glLabel = _glLabel;
@synthesize uploadViewController = _uploadViewController;

//...
- (void)viewDidLoad
{
    [super viewDidLoad];

    UIButton * uploadButton = [[UIButton alloc] initWithFrame:CGRectMake(10.0f, 160.0f, 300.0f, 35.0f)];
    [uploadButton setBackgroundColor:[UIColor blackColor]];
    [uploadButton setTitle:@"Upload Button" forState:UIControlStateNormal];
    [uploadButton addTarget:self action:@selector(loadUploadViewController) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:uploadButton];
    [uploadButton release];

    self.glLabel = [[UILabel alloc] initWithFrame:CGRectMake(10.0f, 200.0f, 300.0f, 35.0f)];
    [self.glLabel setBackgroundColor:[UIColor blackColor]];
    [self.glLabel setTextColor:[UIColor whiteColor]];
    [self.glLabel setTextAlignment:UITextAlignmentCenter];
    [self.glLabel setText:@"Default"];
    [self.view addSubview:self.glLabel];

    self.uploadViewController = [[UploadViewController alloc] initWithStyle:UITableViewStylePlain];
}

//...
#pragma mark -

- (void)loadUploadViewController
{
    [self.uploadViewController setDelegate:self];
    [self.navigationController pushViewController:self.uploadViewController animated:YES];
}

#pragma mark - UploadViewControllerDelegate

- (void)setDataAfterSelectedTabelCell:(NSString *)stringValueInCell
{
    [self.glLabel setText:stringValueInCell];
}

edited Dec 13, 2011 at 3:16

answered Dec 12, 2011 at 13:55

Kjuly

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9 Comments

NipsApp Game Studios Over a year ago

sir i didn't understand this code:// Then just show your another view controller - (void)theMethodDispatchAnotherViewController { [self.navigationController pushViewController:self.yourAnotherViewController animated:YES]; } where did i put this code?

NipsApp Game Studios Over a year ago

so in viewwillappear of another view controller i want to put lbel.text = self.yourAnotherviewcontroller right?

Kjuly Over a year ago

@ICoder it just a sample method, you can put it in your .m file. Well, forget it, just use your self.yourAnotherViewController when you need to display your another view.

NipsApp Game Studios Over a year ago

so label.text =self.yourAnotherViewController; in the viewwillapper of the anotherviewcontroller

Kjuly Over a year ago

@ICoder, nope, it's label.text = self.localStringGValue;, localStringGValue is declared in YourAnotherViewController.h.

|

utsabiem · Accepted Answer · 2011-12-12 13:38:03Z

0

Why don't you declare some @property(nonatomic,retain) and @synthesize it ? Then the getters/setters will be automatically created. Otherwise, define some getter/setters yourself.

answered Dec 12, 2011 at 13:38

utsabiem

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1 Comment

NipsApp Game Studios Over a year ago

i alerdy diclared it,but s i said earlier i didn't ant that value to pas in page redirection code ,i just want that value to displayed in label when i tap the tableview cell

Dipak Chaudhari · Accepted Answer · 2011-12-13 11:55:59Z

0

Go through Following Steps-

In First ViewController -

Create Object of second ViewController like SecondViewController *sec= [[SecondViewController alloc]init]; sec.myLable=@"My Lable String";

In Second ViewController -
In .h file UILable *myLable;

@property(nonautomic,retain)IBOutlet UILable *myLable;

2.In .m file @synthesize myLable;

answered Dec 13, 2011 at 11:55

Dipak Chaudhari

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