IOS：訪問來自NSObject的故事板

爲了努力練習MVC（也鬆散地遵循教程），我已經放置了一個方法，將地址簿聯繫人導入從NSObject繼承的，名爲Model.h的單獨數據類中。它不是UIViewController而是NSObject。IOS：訪問來自NSObject的故事板

我遇到的問題是，如果訪問聯繫人被拒絕，我想跳轉到另一個視圖控制器。而NSObject顯然不會給你訪問storyboard。

模型和處理所發生事件的視圖控制器之間的通信目前通過NSNotificationCenter，但我無法弄清楚如何簡潔地傳達用戶拒絕訪問聯繫人的事實。

任何人都可以建議允許從NSObject訪問故事板或從NSObject與活動UIViewController通信，該訪問已被拒絕。

- (void)fetchAddressBookContacts 
{ 
    ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, NULL); 

    switch (ABAddressBookGetAuthorizationStatus()) { 

     case kABAuthorizationStatusAuthorized: 
     { 
      NSLog(@"User has already granted access to the Address Book"); 
      [self extractContactsFromAddressBookAlt]; 
      break; 
     } 
     case kABAuthorizationStatusDenied: 
     { 
      NSLog(@"User has denied access to the Address Book"); 

      dispatch_async(dispatch_get_main_queue(), ^{ 
       [self gotoNewVC];//does not work 
      }); 
      break; 
     } 
    } 
    if (addressBook) { 
     CFRelease(addressBook);} 
} 
//following is not getting called from NSObject 
-(void) gotoNewVC { 
      UIViewController* rootController = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:@"newVC"]; 

     UINavigationController* navigation = [[UINavigationController alloc] initWithRootViewController:rootController]; 
     self.window.rootViewController = navigation; 
}

來源

2016-04-14 zztop

UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" 
                 bundle: nil]; 
SlowViewController*view=[mainStoryboard instantiateViewControllerWithIdentifier:@"newVC"]; 
[self.navigationController pushViewController:view animated:YES];

使視圖控制器的正確的實例，感謝

來源

2016-04-14 11:39:35

IOS：訪問來自NSObject的故事板

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