How to pass a value from one UIViewController to another - ios

Question

I am making an app where I have to pass a value from a second class to a first class. I have created a delegate method for that in second class.
In second class I have a UITextField, and if enter any text in this textfield it should be passed to a cell in a UITableView in first view.
However, in my case the value is not being passed properly. What have I done wrong?
This is my code:
second.h
#import <UIKit/UIKit.h>
#protocol secondDelegate<NSObject>
#required
- (void)setsecond:(NSString *)inputString;
#end
#interface second : UIViewController {
IBOutlet UITextField *secondtextfield;
id<secondDelegate>stringdelegate;
NSString *favoriteColorString;
}
#property (nonatomic, retain) UITextField *secondtextfield;
#property (nonatomic, assign) id<secondDelegate>stringdelegate;
#property (nonatomic, copy) NSString *favoriteColorString;
#end
second.m
#import "second.h"
#implementation second
#synthesize stringdelegate, secondtextfield, favoriteColorString;
- (void)viewWillDisappear:(BOOL)animated {
[[self stringdelegate] setsecond:secondtextfield.text];
favoriteColorString=secondtextfield.text;
NSLog(#"thuis check:%#", favoriteColorString);
}
- (BOOL)textFieldShouldReturn:(UITextField *)theTextField {
[theTextField resignFirstResponder];
return YES;
}
- (void)viewDidLoad {
[super viewDidLoad];
//[[self stringdelegate] setsecond:secondtextfield.text];
//favoriteColorString = secondtextfield.text;
//NSLog(#"thuis check:%#", favoriteColorString);
}
#end
first.h
#import <UIKit/UIKit.h>
#import "second.h"
#import "TextviewExampleAppDelegate.h"
#interface first : UITableViewController<secondDelegate> {
//TextviewExampleAppDelegate *app;
TextviewExampleAppDelegate *check;
}
first.m
#implementation first
- (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 = check.favoriteColorString;
NSLog(#"this second check:%#", check.favoriteColorString);
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
second *viewtwo = [[second alloc] initWithNibName:#"second" bundle:nil];
//viewtwo.favoriteColorString = indexPath;
viewtwo.stringdelegate = self;
[self.navigationController pushViewController:viewtwo animated:YES];
[viewtwo release];
}
- (void)setsecond:(NSString *)inputString {
if (nil != self.stringdelegate) {
[self.stringdelegate setsecond:inputString];
}
[self.tableView reloadData];
}
#end

Answer 1

remove delegate methods.
import your second class to first one.
in 2nd class import first class and implement id firstClass variable there.
when you pushing 2nd class, set id from (3) to self.
when you'v done and ready to pass it, set firstClass.passedValue = passingValue
pop second class
for example:
//first.h:
#import "second.h"
#class second
//second.h:
#import "first.h"
#class first
...
id firstClass;
//first.m:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
second *viewtwo =[[second alloc]initWithNibName:#"second" bundle:nil];
[self.navigationController pushViewController:viewtwo animated:YES];
viewtwo.firstClass = self;
[viewtwo release];
}
//second.m:
firstClass.passedValue = self.passingValue;

Answer 2

Please refer following rough scratch:
in application delegate .h
Create variable
NSString *varStr;
Assign Property
#propery (nonatomic, retain) NSString *valStr;
In delegate .m
#synthesize varStr;
initialize var
varStr = [NSString strinWithFormat:#"Hi"];
in First class
create delegate var;
delegate class *var = (delegate class*)[[UIApplication sharedApplication] delegate];
set value
var.varStr = [NSString strinWithFormat:#"First"];
get value
NSLog (#"%#",var.varStr);
in Second class
create delegate var;
delegate class *var = (delegate class*)[[UIApplication sharedApplication] delegate];
set value
var.varStr = [NSString strinWithFormat:#"Second"];
get value
NSLog (#"%#",var.varStr);