將參數傳遞給導航控制器的根

Question

我正在初始化導航控制器並設置根視圖控制器。在呈現控制器之前，我設置了一個變量。但是，當新視圖加載時，該變量爲空。我究竟做錯了什麼？

NSString *email = jsonDict[@"email"]; 

     EmailPopUpViewController *controller = [self.storyboard instantiateViewControllerWithIdentifier:@"EmailPopUp"]; 

     CGRect screenBound = [[UIScreen mainScreen] bounds]; 
     CGSize screenSize = screenBound.size; 
     CGFloat screenWidth = screenSize.width; 
     CGFloat screenHeight = screenSize.height; 
     CGFloat xcoord = (screenHeight - 900)/2; 
     CGFloat ycoord = (screenWidth - 640)/2; 

     UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:controller]; 
     controller.emailURL = email; 
     NSLog(@"email: %@", email); 

     navController.modalPresentationStyle = UIModalPresentationFormSheet; 
     navController.view.superview.frame = CGRectMake(xcoord, ycoord, 640, 900); 
     [self presentViewController:navController animated:NO completion:nil]; 

Answer 1

我不小心設置emailURL弱的財產......其更改爲強解決問題