Storing info from UITextField back to detailTextLabel - ios

Question

I have a tableViewCell that says Nickname and when you click on it, a segue takes you to a view controller with a text field where you can type a nickname, once you push the back button it should appear in the detailTextLabel of the main table view controller. I just keep getting an error I posted the code below where I get an error as well.
nickname text field code:
#import "NicknameViewController.h"
#interface NicknameViewController ()
#end
#implementation NicknameViewController
- (void)viewDidLoad
{
[super viewDidLoad];
[self.delegate updateCarNickname:self.nicknameField];
}
#end
Here is the header file for the nickname view controller:
#import <UIKit/UIKit.h>
#protocol CarNicknameDelegate <NSObject>
#optional
- (void)updateCarNickname:(UITextField *)updateNickname;
#end
#interface NicknameViewController : UIViewController
#property (nonatomic, weak) id <CarNicknameDelegate> delegate;
#property (strong, nonatomic) IBOutlet UITextField *nicknameField;
#end
In the main view controller I keep getting errors on this code and can't seem to figure it out:
-(void)updateCarNickname:(UITextField *)updateNickname {
self.nicknameCell.detailTextLabel.text = updateNickname;
}
Before the segue begins I used this code:
if ([segue.identifier isEqualToString:#"nicknameSegue"]) {
NicknameViewController *controller = segue.destinationViewController;
controller.delegate = self;
}

Answer 1

All views in a view controller gets deallocated once the view controller's dealloc is called.
You should change your CarNicknameDelegate's parameter UITextField to NSString.
#protocol CarNicknameDelegate <NSObject>
#optional
- (void)updateCarNickname:(UITextField *)updateNickname;
#end
and change your NicknameViewController to something like this.
#interface NicknameViewController ()
#end
#implementation NicknameViewController
- (void)viewDidLoad
{
[super viewDidLoad];
[self.delegate updateCarNickname:self.nicknameField.text];
}
#end