ios - [NSCFArray 长度] : unrecognized selector sent to instance

Question

我正在尝试用数组中的一些数据填充 TableView 。该数组已填充，但是当我运行该应用程序时出现此错误:原因:'-[__NSCFArray 长度]:无法识别的选择器已发送到实例

我搜索过类似的问题，但没有一个适合我。我没有使用 lenght 函数，我的应用程序崩溃了:cell.textLabel.text = [self.currentDate objectAtIndex:indexPath.row];

quizViewController.m

- (void)passDataForward
{
    ScoreViewController *secondViewController = [[UIStoryboard storyboardWithName:@"Storyboard" bundle:[NSBundle mainBundle]]instantiateViewControllerWithIdentifier:@"score"];

    secondViewController.data =self.scoreLabel.text;
    secondViewController.delegate = self;

    NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults];
    [highScores insertObject:self.scoreLabel.text atIndex:highScores.count];

    NSData *currentDate =[NSDate date];
    NSDateFormatter *dateFormatter=[[NSDateFormatter alloc]init];
    [dateFormatter setDateFormat:@"dd.MM.YYYY                        HH:mm:ss"];
    NSString *dateString =[dateFormatter stringFromDate:currentDate];

    [data insertObject:dateString atIndex:data.count];



    NSMutableArray *scorearray = [[NSMutableArray alloc] initWithArray:[[NSUserDefaults standardUserDefaults] arrayForKey:@"high_scoresarray"]];

     NSMutableArray *dataArray = [[NSMutableArray alloc] initWithArray:[[NSUserDefaults standardUserDefaults] arrayForKey:@"data_score"]];

    [scorearray addObject:highScores];
    [dataArray addObject:data];

    [[NSUserDefaults standardUserDefaults] setObject:scorearray forKey:@"high_scoresarray"];
    [[NSUserDefaults standardUserDefaults] setObject:dataArray forKey:@"data_score"];


    secondViewController.test=[NSMutableArray arrayWithArray: scorearray];
    secondViewController.currentDate=[NSMutableArray arrayWithArray: dataArray];

    [self presentViewController:secondViewController animated:YES completion:^(void)
     {

     }];
}

ScoreViewController.m

-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

    static NSString *cellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if (cell==nil) {
        cell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellIdentifier];
    }
    cell.textLabel.text = [self.currentDate objectAtIndex:indexPath.row];
   cell.detailTextLabel.text=[self.test objectAtIndex:indexPath.row];

    return cell;
}

Answer 1

错误意味着这一行:

[self.currentDate objectAtIndex:indexPath.row]

返回一个数组而不是一个 NSString。这意味着

self.currentDate

包含 NSArray 对象而不是 NSString 对象。