Question

Hi I tried another code for passing data but it is not working. How to pass UITextField value on firstview on UITableViewCell on row? Please someone help me on delegate protocol

//
//  first.h
//  TextviewExample
//
//  Created by pradeep.yadav on 12/5/11.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "second.h"
#import "TextviewExampleAppDelegate.h"

//@class second;



@interface first : UITableViewController <secondDelegate>{

    //TextviewExampleAppDelegate*app;
    //TextviewExampleAppDelegate *check;
    second *secondview;
    NSString                *secondFavoriteColorString;
    //second *value;

}
@property (nonatomic, retain) second *secondview;
@property (copy) NSString   *secondFavoriteColorString;
@end




- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }

    // Configure the cell...
    cell.textLabel.text=@"message";
    cell.detailTextLabel.text=secondFavoriteColorString;
    NSLog(@"this second check:%@",secondFavoriteColorString);

    return cell;
}



- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {


    second *viewTwo = [[second alloc] initWithNibName:@"second" bundle:[NSBundle mainBundle]];
    self.secondview = viewTwo;
    [viewTwo release];
    [self.navigationController pushViewController:self.secondview animated:YES];
}


-(void)setsecond:(NSString*)secondtextview
{
    secondFavoriteColorString = secondtextview;
    NSLog(@"this second check:%@",secondFavoriteColorString);
}


this second class

//
//  second.h
//  TextviewExample
//
//  Created by pradeep.yadav on 12/5/11.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>
@protocol secondDelegate<NSObject>
@required
-(void)setsecond:(NSString*)secondtextview ;//forIndexPath:(NSIndexPath*)indexPath;



@end


@interface second : UIViewController {
    IBOutlet UITextField *secondtextfield;

    NSString             *favoriteColorString;
id <secondDelegate> delegate;
}
@property (nonatomic,retain)UITextField *secondtextfield;
//@property (nonatomic,assign)id<secondDelegate>delegate;
@property (retain) id delegate;
@property (nonatomic,copy)NSString           *favoriteColorString;

@end



#import "second.h"


@implementation second
@synthesize delegate,secondtextfield,favoriteColorString;


- (void) viewWillDisappear:(BOOL) animated
{
    [[self delegate] setsecond:secondtextfield.text];
    favoriteColorString=secondtextfield.text;
    NSLog(@"thuis check:%@",favoriteColorString);
}


- (BOOL) textFieldShouldReturn: (UITextField *) theTextField
{
    [theTextField resignFirstResponder];

    return YES;
}

Answer 1

I think the trouble is that you have declared the delegate in the second view, and you are trying to call it from the first view. By the time you have returned to the first view, it’s very likely that the second view has been cleaned up.

What you want to do is declare the delegate methods in the first view controller, and when you create the second view controller, you set the first view controller to be the delegate of the second view controller.

I created an example project a while ago. It doesn’t deal with a table view, but it demonstrates passing a string back from a second view controller to the first view controller.