Question

NSDateFormatter *formatter;
    NSString *dateString;
    formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"dd-MM-yyyy HH:mm a"];
    dateString = [formatter stringFromDate:[NSDate date]];
    [formatter release];

    appDelegate.myCallLogDict = [[NSMutableDictionary alloc]init];
    [appDelegate.myCallLogDict setObject:phoneNo forKey:@"CallLogPhoneNoKey"];
    [appDelegate.myCallLogDict setObject:dateString forKey:@"CallLogTimeStampKey"];

我已将电话号码和时间存储到nsmutabledictionery中，我想访问该dictionery值，如下所示 -

(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath method

cell.detailTextLabel.text = [[appDelegate.myCallLogDict objectForKey:@"CallLogTimeStampKey" ]objectAtIndex:row];
cell.textLabel.text = [[appDelegate.myCallLogDict objectForKey:@"CallLogPhoneNoKey"] objectAtIndex:row];

当我运行上面的代码时，我得到以下错误

请帮帮我

-[NSCFString objectAtIndex:]: unrecognized selector sent to instance 0x5b227e0
2011-12-15 10:06:09.050 MyDialer[1090:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString objectAtIndex:]: unrecognized selector sent to instance 0x5b227e0'

非常感谢你的帮助

Answer 1

试试这个：

cell.detailTextLabel.text = [appDelegate.myCallLogDict objectForKey:@"CallLogTimeStampKey"];
cell.textLabel.text = [appDelegate.myCallLogDict objectForKey:@"CallLogPhoneNoKey"];

您不需要使用objectAtIndex，因为您正在通过

获取单个字符串

[appDelegate.myCallLogDict objectForKey:@"CallLogPhoneNoKey"];

Answer 2

您希望您的字典包含密钥CallLogTimeStampKey的字符串数组，但您只插入了一个字符串。

Answer 3

我认为您必须将关键数据保存在数组中，然后使用该数组上的objectAtIndex。

Answer 4

在我的情况下，存在以下问题：

有一个属性@property (nonatomic, retain) NSIndexPath *selectedCell;
合成为@synthesize selectedCell = _selectedCell;
带有吸气剂
- （NSIndexPath *）selectedCell { if（！_selectedCell）{ _selectedCell = [NSIndexPath indexPathForRow：self.selectedImageNumber inSection：kTexturesListSection]; } return _selectedCell; }
然后在代码中的某些地方调用self.selectedCell.row导致崩溃

将getter更改为

（NSIndexPath *）selectedCell { if（！_selectedCell）{ _selectedCell = [[NSIndexPath indexPathForRow：self.selectedImageNumber inSection：kTexturesListSection] retain]; } return _selectedCell; }

一个错误消失了。该漏洞仅在iOS 5上被注意到。

[NSCFString objectAtIndex：]：使用nsmutabledictionery时发送到实例的无法识别的选择器

4 个答案: