iphone - [NSCFString objectAtIndex :]: unrecognized selector sent to instance when using nsmutabledictionery

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"];

我已经将电话号码和时间存储到一个 nsmutabledictionery 中，我想像下面那样访问该词典值到 -

(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，出现以下错误

请扶我起来

-[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'

非常感谢您的帮助

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，因为您通过

获取单个字符串

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