protocol method is not being called by the delegate - ios

Question

I have implemented protocol in my app,
I have declared protocol method in loginViewController and i am calling protocolMethod from confirmViewController
Here is my code snippet:
loginViewController.h
#protocol FirstControllerDelegate<NSObject>
#required
-(void)protocolMethod;
#end
#interface loginViewController : UIViewController<FirstControllerDelegate>
#end
loginViewController.m
- (IBAction)loginBtnClicked:(id)sender {
confirmViewController *obj = [confirmViewController new];
obj.delegate=self;
[self performSegueWithIdentifier:#"confirmloginsegue" sender:self];
}
-(void)protocolMethod{
NSLog(#"--- This is not callled ---");
[self dismissViewControllerAnimated:NO completion:nil];
}
Code for
confirmViewController.h
#interface confirmViewController : UIViewController
#property (nonatomic, assign) id <FirstControllerDelegate> delegate;
#end
confirmViewController.m
(IBAction)continueClicked:(id)sender {
[_delegate protocolMethod]; //Calling protocol method...
[self dismissViewControllerAnimated:YES completion:nil];
}
Where i am doing mistake?
Please help and thanks in advance!

Answer 1

Wrong Approach and delegate initialisation
In this lines:-
confirmViewController *obj = [confirmViewController new];
obj.delegate=self;
[self performSegueWithIdentifier:#"confirmloginsegue" sender:self];
--- You are loosing the object here
Solution
In your attribute inspector give the identifier for that confirmViewController, now push the vc and set the delegate for the object confirmViewController like this:-
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil];
ConfirmViewController *confirmViewController = [storyboard instantiateViewControllerWithIdentifier:#"ConfirmViewController"];
confirmViewController.delegate=self;
[self.navigationController pushViewController:confirmViewController animated:YES];

Answer 2

The delegating class does not exist for long enough to matter:
- (IBAction)loginBtnClicked:(id)sender {
confirmViewController *obj = [confirmViewController new];
obj.delegate=self;
[self performSegueWithIdentifier:#"confirmloginsegue" sender:self];
// obj is destroyed here
}

Answer 3

You need to implement prepareForSegue and set delegate there e.g.
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
confirmViewController *destViewController = (confirmViewController *)segue.destinationViewController;
destViewController.delegate=self;
}
for further detail check this link:- http://www.appcoda.com/storyboards-ios-tutorial-pass-data-between-view-controller-with-segue/

Answer 4

You have to set delegate there. please,make some correction in your code like:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
confirmViewController *destViewController = (confirmViewController *)segue.destinationViewController;
destViewController.delegate=self;
}

Answer 5

You shoul use preparefrosegue to set your delegate object. so your code should be like this,
- (IBAction)loginBtnClicked:(id)sender {
[self performSegueWithIdentifier:#"confirmloginsegue" sender:self];
}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
confirmViewController *obj = [confirmViewController new];
//or
confirmViewController *obj = [segue destinationViewController];
obj.delegate=self;
}
hope this will help ;)

Answer 6

If u are using View controller
SettingsHubViewController *settingVC = [[UIStoryboard storyboardWithName:#"Main" bundle:nil] instantiateViewControllerWithIdentifier:#"yourStoryBoardIdentifier"];
settingVC.delegate = self;
If u are using XIB load the NIB after that set the settingVC.delegate = self;
its working for me (I created OverLay view and loaded in main class)