ios - [__NSCFString countByEnumeratingWithState :objects:count:]: unrecognized selector sent to instance 0x16e09f70'

Question

由于未捕获的异常“NSInvalidArgumentException”而导致错误 Terminating app，原因:“-[__NSCFString countByEnumeratingWithState:objects:count:]: 无法识别的选择器发送到实例 0x16e09f70”

if (finalArray.count != 0)
    {
        NSMutableDictionary *fetchDict = [[NSMutableDictionary alloc]initWithDictionary:[finalArray objectAtIndex:indexPath.row]];
        NSMutableArray *valueArr = [[NSMutableArray alloc]initWithArray:[fetchDict allValues].mutableCopy];


        for (NSMutableArray *one in valueArr) {
            for (NSMutableArray *two in one) // Program Stops on This Line
            {
                cell.textLabel.text = [NSString stringWithFormat:@"%@",[two valueForKey:@"Note"]];
            }
        }

    }
}

Answer 1

试试这个

if (finalArray.count != 0)
{
    NSMutableDictionary *fetchDict = [[NSMutableDictionary alloc]initWithDictionary:[finalArray objectAtIndex:indexPath.row]];
    NSMutableArray *valueArr = [[NSMutableArray alloc]initWithArray:[fetchDict allValues].mutableCopy];


    for (NSMutableArray *one in valueArr) {
        if ([one isKindOfClass:[NSMutableArray class]]) { //Check if array here
            for (NSMutableArray *two in one) 
            {
                cell.textLabel.text = [NSString stringWithFormat:@"%@",[two valueForKey:@"Note"]];
            }
        }else {
            NSLog(@"Program stops because this one: %@", one);
        }
    }

}