ios - 如何从 detailViewController 填充数组并返回到 iOS 中的 masterViewController？

Question

我有一个 tableView，我从中导航到一个“viewController”，即 PassengerInfoViewController，我在其中有一个表单。我填写表单，制作一个 dictionary 并将其添加到 NSMutableArray。

所以当我回到 tableView' 时，我想传递这个数组，然后用填充的数组重新加载 tableView。

所以这就是我正在做的:-

  //navigate to the form
  - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{

  PassengerInfoViewController *pivc = [self.storyboard instantiateViewControllerWithIdentifier:@"PassengerInfoViewController"];
  [self.navigationController pushViewController:pivc animated:YES];

}

 //After filling up the form 

 -(void)goBackToPassengerDetails:(UIButton*)sender{

   NSString *title = self.titleTextField.text;
   NSString *fname = self.firstNameTextField.text;
   NSString *lname =self.lastNameTextField.text;
   NSString *ageStr = self.ageTextField.text;

   NSMutableDictionary *dict = [[NSMutableDictionary alloc]init];
   [dict setValue:title forKey:@"title"];
   [dict setValue:fname forKey:@"firstName"];
   [dict setValue:lname forKey:@"lastName"];
   [dict setValue:ageStr forKey:@"age"];
   Passenger *passengerObj = [Passenger sharedInstance]; //Singleton

   [passengerObj.passengerDetailArray addObject:dict];

    PassengerDetailsViewController *pdc = [self.storyboard instantiateViewControllerWithIdentifier:@"PassengerDetailsViewController"];
[pdc getPassengerinfo:passengerObj.passengerDetailArray];
[self.navigationController popViewControllerAnimated:YES];

导航回来后，我重新加载 TableView 。但是 celForRow 方法不会填充新值。

 -(void)getPassengerinfo:(NSMutableArray*)arr{
  passenger_infoArray =[[NSMutableArray alloc]init];
  passenger_infoArray = arr;
  NSLog(@"Passenger Info Array : %@", passenger_infoArray);//Shows array of dictionaries

  [passengerInfoTableView reloadData];
}

我的 cellForRow 方法如下所示:

   - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
   //Not called when I am doing reload data
   static NSString *CellIdentifier = @"Cell";
   cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
   if (cell == nil)
   {
       cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier ];

   }
   NSLog(@"Table view array  : %@",passenger_infoArray); 
   if (passenger_infoArray.count>0) {

    NSString *temp= [[passenger_infoArray objectAtIndex:indexPath.row]objectForKey:@"firstName"];
    cell.textLabel.text = temp;
   }else{

    cell.textLabel.text = [NSString stringWithFormat:@"Passenger %ld", (long)indexPath.row+1];
    cell.imageView.image = [UIImage imageNamed:@"user.png"];

   }
     return cell;

  }

Answer 1

你可以使用

传递数据

1. 代表
2. 通知
3. 属性
4. 全局变量

使用委托(delegate)是一种很好的做法，最后两个不是首选。