ios - 为什么我的数据没有通过 View Controller 传递？

Question

我正在尝试将文本字段文本从一个 Controller 传递到另一个 Controller ，以便我可以通过电子邮件发送它。我正在遵循一个例子，但我一定遗漏了一些小细节。基本上，目标是将数据文本字段文本从 Enteryournamecontroller Controller 传递到选项 Controller 的 nsstring。 nsstring 的字符串变量返回 null。

EnterYourNameController.h

 @interface EnterYourNameController : UIViewController{

  UITextField *textField;

  id <EnterYourNameController> delegate;
 }
  @property (strong, nonatomic) NSString *stringEntered;
  @property (strong, nonatomic)  UITextField *textField;
  @property (strong, nonatomic) id delegate; 

EnterYourNameController.m

       -(void)button{
       stringEntered=textField.text;

      ((Options *) (self.delegate)).string = stringEntered;

           UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
Options *vc = [storyboard instantiateViewControllerWithIdentifier:@"Options"];
     [self.navigationController pushViewController:vc animated:YES];

       }

选项.h

  @interface Options : UIViewController <MFMailComposeViewControllerDelegate> {

   NSString *string;
   }
   @property (strong,nonatomic) NSString* string;

   @end

选项.m

     NSString *emailBody = [NSString stringWithFormat:@"%@",string];

Answer 1

在-(void)按钮方法中，初始化Options Controller 并设置值。

-(void)button{

       stringEntered=textField.text;
       Options *optViewController = [[Options alloc] init];
       optViewController.string = stringEntered;
       //call your optViewController here
  }