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Help with Objective C delegate not working

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  Help with Objective C delegate not working Ronaldo Bahia <ronaldo@jobconvo.com> - 2015-09-10 17:28 -0700
    Re: Help with Objective C delegate not working "Pascal J. Bourguignon" <pjb@informatimago.com> - 2015-09-11 04:07 +0200
      Re: Help with Objective C delegate not working Ronaldo Bahia <ronaldo@jobconvo.com> - 2015-09-11 08:03 -0700
        Re: Help with Objective C delegate not working "Pascal J. Bourguignon" <pjb@informatimago.com> - 2015-09-12 01:12 +0200
          Re: Help with Objective C delegate not working Ronaldo Bahia <ronaldo@jobconvo.com> - 2015-09-15 09:28 -0700

#184 — Help with Objective C delegate not working

I'm learning objective c and need help to understand delegate.

I have a UITextField in the FirstViewController and I want to show the text inputed in the SecondViewController.

But it's not working. What am I doing wrong?

Here is the thread:

http://stackoverflow.com/questions/32513570/objective-c-text-field-with-delegate-not-working


Thanks in advance
Ronaldo

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#185

Ronaldo Bahia <ronaldo@jobconvo.com> writes:

> I'm learning objective c and need help to understand delegate.
>
> I have a UITextField in the FirstViewController and I want to show the
> text inputed in the SecondViewController.
>
> But it's not working. What am I doing wrong?
>
> Here is the thread:
>
> http://stackoverflow.com/questions/32513570/objective-c-text-field-with-delegate-not-working

It would be easier if you copy-pasted the text here, along with the
sources.


-- 
__Pascal Bourguignon__                 http://www.informatimago.com/
“The factory of the future will have only two employees, a man and a
dog. The man will be there to feed the dog. The dog will be there to
keep the man from touching the equipment.” -- Carl Bass CEO Autodesk

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#186

Here is my code:

FirstViewController.h

#import <UIKit/UIKit.h>

@interface FirstViewController : UIViewController 

@property (weak, nonatomic) IBOutlet UIButton *accessButton;
@property (weak, nonatomic) IBOutlet UITextField *codeField;
@property (nonatomic, retain) NSString *getCodeString;

@end
SecondViewController.h

#import <UIKit/UIKit.h>

@class CodeField;

@protocol CodeFieldHandlerDelegate <NSObject>

@property NSString *saveCodeString;

@end

@interface SecondViewController : UIViewController

@property (weak, nonatomic) IBOutlet UILabel *candidateLabel;

@property (weak, nonatomic) id <CodeFieldHandlerDelegate> myDelegate;

@end
FirstViewController.m

#import "FirstViewController.h"
#import "SecondViewController.h"

@interface FirstViewController ()

<CodeFieldHandlerDelegate>

@property (nonatomic, strong) SecondViewController *secondViewController;

@end

@implementation FirstViewController

@synthesize getCodeString;
@synthesize secondViewController;
@synthesize saveCodeString;

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (IBAction)accessButton:(UIButton *)sender {

    //get the input data from text field and store into string
    getCodeString = self.codeField.text;

    //go keypad back when button clicked from textfield
    [self.codeField resignFirstResponder];

    secondViewController = [[SecondViewController alloc] init]; 
    secondViewController.myDelegate = self;

    [self.navigationController pushViewController:secondViewController animated:YES];

}

// name of this string is the same of the NSString in the delegate
- (NSString *) saveCodeString {
    return getCodeString;
}

@end
And SecondViewController.m

 #import "SecondViewController.h"

 @interface SecondViewController ()

 @end

 @implementation SecondViewController

 @synthesize candidateLabel;
 @synthesize myDelegate;

 - (void)viewDidLoad {
    [super viewDidLoad];

     self.candidateLabel.text = [myDelegate saveCodeString];
}

@end



Em quinta-feira, 10 de setembro de 2015 23:07:37 UTC-3, Pascal J. Bourguignon  escreveu:
> Ronaldo Bahia <ronaldo@jobconvo.com> writes:
> 
> > I'm learning objective c and need help to understand delegate.
> >
> > I have a UITextField in the FirstViewController and I want to show the
> > text inputed in the SecondViewController.
> >
> > But it's not working. What am I doing wrong?
> >
> > Here is the thread:
> >
> > http://stackoverflow.com/questions/32513570/objective-c-text-field-with-delegate-not-working
> 
> It would be easier if you copy-pasted the text here, along with the
> sources.
> 
> 
> -- 
> __Pascal Bourguignon__                 http://www.informatimago.com/
> "The factory of the future will have only two employees, a man and a
> dog. The man will be there to feed the dog. The dog will be there to
> keep the man from touching the equipment." -- Carl Bass CEO Autodesk

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#187

Ronaldo Bahia <ronaldo@jobconvo.com> writes:

> Em quinta-feira, 10 de setembro de 2015 23:07:37 UTC-3, Pascal J. Bourguignon  escreveu:
>> Ronaldo Bahia <ronaldo@jobconvo.com> writes:
>> 
>> > I'm learning objective c and need help to understand delegate.
>> >
>> > I have a UITextField in the FirstViewController and I want to show the
>> > text inputed in the SecondViewController.
>> >
>> > But it's not working. What am I doing wrong?

viewDidLoad is not called by alloc or init.  It's called when you load
the view from a Nib file.
In your case, it's never called.

You should explicitely call a method of your SecondViewController to
give it the text to display.  In this case, you don't need a delegate.

in SecondViewController:

    -(void)setText:(id)newText {
        self.candidateLabel.text=newText;
    }

and in FirstViewController:

    secondViewController = [[SecondViewController alloc] init]; 
    [secondViewController setText:getCodeString];

-- 
__Pascal Bourguignon__                 http://www.informatimago.com/
“The factory of the future will have only two employees, a man and a
dog. The man will be there to feed the dog. The dog will be there to
keep the man from touching the equipment.” -- Carl Bass CEO Autodesk

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#188

Thanks a lot. 

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