iphone - 将值传递到第一个 View 的文本字段

Question

我有两个带有导航 Controller 的 View :第一个 View 有空文本字段，而第二个 View 是用户可以在其中选择一行的 TableView 。触摸行时，会执行一个操作，将值设置为第一个 View 的文本字段。不幸的是，当我返回到第一个 View 字段时，未设置。

这是我的代码:

FirtViewController.h

      @interface FirstViewController : UIViewController 
      {
          UITextField *firstField;
          UITextField *secondField;
      }
      @property(nonatomic, retain) IBOutlet UITextField *firstField;
      @property(nonatomic, retain) IBOutlet UITextField *secondField;
      @property(copy) NSString *selectedRow;
      -(IBAction)showTable:(id)sender

FirstViewController.m

      #import "FirstViewController.h"
      #import "AppDelegate.h"
      #import "SecondViewController.h"

      @implementation FirstViewController
      @synthesize  .....
      .............


      -(void)viewDidAppear:(BOOL)animated 
      {
        [super viewDidAppear:animated];
        self.firstField.text = selectedRow;
      }

      -(IBAction)showTable:(id)sender
      {
         SecondViewController *controllerSecond = [[SecondViewController alloc]  initWithNibName:@"SecondViewController" bundle:nil];
         [self.navigationController pushViewController:controllerSecond animated:YES];
      }

SecondViewController.h

      @class FirstViewController;

      @interface ListaViewController : UIViewController 
      <UITableViewDataSource, UITableViewDelegate, UISearchBarDelegate>
      {
         UITableView *table;
         UISearchBar *search;
         FirstViewController *controller;
      }
      @property (nonatomic, retain) FirstViewController *controller;

SeconViewController.m

      - (void)tableView:(UITableView *)tableView 
         didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

            NSString *selectedRow = [tableData objectAtIndex:indexPath.row];

            controller.selectedRow = selectedRow;
            [self.navigationController popViewControllerAnimated:YES];
      }

Answer 1

根据上面的代码，您从未将 SecondViewController 中的连接设置回第一个
您可能需要这样的东西:

  -(IBAction)showTable:(id)sender
      {
         SecondViewController *controllerSecond = [[SecondViewController alloc]  initWithNibName:@"SecondViewController" bundle:nil];
         [controllerSecond setController:self];  //this sets the reference back
         [self.navigationController pushViewController:controllerSecond animated:YES];
      }