将 NSDictionary 转换为 NSArray

Question

我正在尝试将我的 NSDictionary (storageData) 转换为 NSArray，因为我需要通过 segue 传递字典中包含的数据（标题）。我已经实现了下面的（见最后一个方法，tableview 只是为了提供一些上下文），但是发生崩溃并出现以下错误：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString objectForKey:]: unrecognized selector sent to instance

知道如何解决吗？

Viewcontrolller.m

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *DoctorsTableIdentifier = @"StorageItemTableViewCell";

    StorageItemTableViewCell *cell = (StorageItemTableViewCell *)[tableView dequeueReusableCellWithIdentifier:DoctorsTableIdentifier];
    if (cell == nil)

        {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"StorageItemTableViewCell" owner:self options:nil];
        cell = [nib objectAtIndex:0];

            NSDictionary *tmp = [self.storageData objectForKey:[NSString stringWithFormat:@"%d",(long)indexPath.row]];

        [[cell itemName] setText:(NSString *)[tmp objectForKey:@"title"]];

              NSString *title = [tmp objectForKey:@"title"];
              [[cell itemName] setText:title];

 NSDictionary *node = [self.descripData objectAtIndex:indexPath.row];
 [[cell itemDescrip] setText:[node objectForKey:@"body"]];

NSString *secondLink = [[self.descripData objectAtIndex:indexPath.row] objectForKey:@"photo"];

[cell.itemPhoto sd_setImageWithURL:[NSURL URLWithString:secondLink]];

              }

              return cell;
              }


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

    NSArray *values = [self.storageData allKeys];

    ItemDetailViewController *detailViewController = [[ItemDetailViewController alloc]
                                                                   initWithNibName:@"ItemDetailViewController" bundle:nil];

    detailViewController.title = [[values objectAtIndex:indexPath.row] objectForKey:@"title"];
    detailViewController.itemDetail = [self.descripData objectAtIndex:indexPath.row];
    detailViewController.secondLink = self.descripData[indexPath.row][@"photo"];
    [self.navigationController pushViewController:detailViewController animated:YES];
       }

Answer 1

错误表明您正在 NSString 类型的对象中调用 objectForKey，而该对象没有声明该方法。

所以在方法的开头打断点，逐行逐行直到崩溃，然后检查你认为是字典的变量是字符串。

Answer 2

我相信如果你要提取 allValues 而不是 allKeys 那么你只能：

[values objectAtIndex:indexPath.row]

因为您使用的索引是 indexPath.row。如果这有帮助，请告诉我。

将 NSDictionary 转换为 NSArray

Convert NSDictionary to NSArray

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nsarray

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