CODEWITHSUNDEEP
iosdelegates
Ritesh Kumar Gupta
Ritesh Kumar Gupta

Reputation: 5191

Delegates method never being called

I am quite new to IOS, and I was working with delegates to call a method in parent ViewController.

ViewControllerRegistration.h

@protocol RegistrationViewControllerDelegate;
@interface ViewControllerRegistration : UIViewController
@property (nonatomic, weak) id<RegistrationViewControllerDelegate> delegate;
- (IBAction)registerNewUser:(id)sender;
@end

// 3. Definition of the delegate's interface
@protocol RegistrationViewControllerDelegate <NSObject>
-(void)loginResult:(NSString*)loginData;
@end

ViewControllerRegistration.m

- (void)registerNewUser:(id)sender {
 id<RegistrationViewControllerDelegate> strongDelegate = self.delegate;

    // Our delegate method is optional, so we should
    // check that the delegate implements it
    if ([strongDelegate respondsToSelector:@selector(loginResult:)]) {
        [strongDelegate loginResult: @"@WHY YOU NOT BEING CALLED?"];
    }

Parents:

ViewController.h

#import "ViewControllerRegistration.h"

@interface ViewController : UIViewController <GPPSignInDelegate,FBSDKLoginButtonDelegate,RegistrationViewControllerDelegate>
@end

ViewController.m

@implementation ViewController
@synthesize signInButton;
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

ViewControllerRegistration  *detailViewController = [[ViewControllerRegistration alloc] init];
    // Assign self as the delegate for the child view controller
    detailViewController.delegate = self;
}
//Local Strategy
- (IBAction)navigateToLocalSignUpNavBtn:(id)sender {
    [self performSegueWithIdentifier:@"SegueRegisterUserAction" sender:self];
}

// Implement the delegate methods for RegistrationViewControllerDelegate
-(void)loginResult:(NSString*)loginData{
    NSLog(@"I am called");
    //^Above is never printed. That means delegate method is never called
}

Please note, my parent view controller is embedded in a navigation controller.

The delegate method is never called. Tried debugging, but in vain.

Upvotes: 0

Views: 71

Answers (2)

dan
dan

Reputation: 9825

The view controller you are creating in viewDidLoad isn't the same one that you will be segueing to. It's another instance that will be deallocated at the end of the method. You need to access the correct instance in prepareForSegue and set the delegate there.

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"SegueRegistrationUserAction"]) {
        [(ViewControllerRegistration *)segue.destinationViewController setDelegate:self];
    }
}

Upvotes: 1

Abhinav
Abhinav

Reputation: 38162

Yesterday, I had explained this in length on this thread. Please take a look and let me know if you have any specific question post that. I hope this would help you.

Upvotes: 1

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