Question

How to correctly target delegate if I don’t want to create instance and setting delegate in viewDidLoad() but in some method? Everything is working, but got warning.

// ViewController.m    
// Warning: Assigning to 'id'<UINavigationControllerDelegate,UIImagePickerControllerDelegate> from incomplatible type 'ViewController *const __strong

-(void)takeMedia:(UIButton *)sender
{  
  mypicker = [UIImagePickerController new];
  mypicker.delegate = self; // <<<----
  mypicker.sourceType = UIImagePickerControllerSourceTypeCamera;
  [self presentViewController:mypicker animated:YES completion:nil];
}

Answer 1

Make sure you have included both the delegates in your header file like

@interface MyViewController <UINavigationControllerDelegate,UIImagePickerControllerDelegate>