setDelegate to my custom view controller fall with unrecognized selector - ios

Question

I have a view controller on the StoryBoard with my custom class. Here the code:
BGMDatePickerViewController.h
#import <UIKit/UIKit.h>
//declare a protocol with name
#protocol DatePickerViewControllerDelegate //declare a delegate so that this class can notify another class when a user selects a chart
//protocol methods
//- (void)userDataChangedWithUsername;
#end
//declare a class with inheritance
#interface BGMDatePickerViewController : UIViewController <UIPickerViewDelegate, UIPickerViewDataSource, UITextFieldDelegate>
//create a public property
#property (weak, nonatomic) id<DatePickerViewControllerDelegate> delegate; //property to store the delegate
#end
I would like to show this ViewController on another one with delegate. Here the code:
BGMChartViewController.h
#import <UIKit/UIKit.h>
#import "BGMDatePickerViewController.h"
//declare a class with inheritance
#interface BGMChartViewController : UIViewController <UIActionSheetDelegate, DatePickerViewControllerDelegate> //conforms UIActionSheetDelegate and my custom DatePickerViewControllerDelegate protocols
//create a public IB methods
- (IBAction)showDateEntryForm:(id)sender;
#end
BGMChartViewController.m
#import "BGMChartViewController.h"
#interface BGMChartViewController ()
//create a private properties
#property (strong, nonatomic) UIPopoverController *datePickerPopover;
#end
#implementation BGMChartViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:NO];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (IBAction)showDateEntryForm:(id)sender
{
DDLogVerbose(#"%s: has been started...", __FUNCTION__);
BGMDatePickerViewController *datePickerVC = [self.storyboard instantiateViewControllerWithIdentifier:#"dateEntryFormVC"];
datePickerVC.delegate = self; //HERE THE FALL!!!!!
self.datePickerPopover = [[UIPopoverController alloc] initWithContentViewController:datePickerVC];
//define the popover size
self.datePickerPopover.popoverContentSize = CGSizeMake(320.0, 400.0);
//let’s display it
[self.datePickerPopover presentPopoverFromRect:[(UIButton *)sender frame]
inView:self.view
permittedArrowDirections:UIPopoverArrowDirectionAny
animated:YES];
}
#end
On the line which I marked it just fall with:
-[BGMDatePickerViewController setDelegate:]: unrecognized selector sent to instance 0x78a3bcf0
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[BGMDatePickerViewController setDelegate:]: unrecognized selector sent to instance 0x78a3bcf0'
If I comment this problem line it's ok I see my custom view controller so that means that I am ok with instantiateViewControllerWithIdentifier tag...
I don't understand what do I do wrong?

Answer 1

Modify to the below line and check:-
#protocol DatePickerViewControllerDelegate<NSObject>