拉动刷新导致应用程序崩溃:NSRangeException,原因:索引 8 超出范围 [0 .. 4]

Pull to refresh resulting app to crash: NSRangeException, reason: index 8 beyond bounds [0 .. 4]

抱歉,如果之前有人问过这个问题,但我找不到问题的答案。

我编写了用于拉动刷新的代码,但如果结果数组计数与 indexPath.row 不同,它就会崩溃,并且我已尝试删除我的数组对象,但它仍然崩溃。

我的代码适用于此:

-(void)loadMore:(id) sender {
    loadFlag = 1;
    NSString *employeeID = @"aaa";
    days = 3;

    int projIDNum = 1234;
    int depCode = 1234000001;
    int caseNum = 45678;
    NSString *result = [client report_search:employeeID case_no:caseNum status:loadFlag 
        day:days project_id:projIDNum dep_code:depCode count:10];
    if ([result isEqualTo:@"[]"]) {
        [Utilities callAlert:self title:@"No More Data" body:@"There is no other data contains"];
        [refresh endRefreshing];
    } else {
        NSData *jsonData = [result dataUsingEncoding: NSUTF8StringEncoding];
        NSError *error;
        [resultArr removeAllObjects];
        // resultArr is NSMutableArray and it's the tableview's data source
        resultArr = [[NSJSONSerialization JSONObjectWithData:jsonData options: 0 
            error:&error] mutableCopy];
        [refresh endRefreshing];
        [_mSearchTableView reloadData];
    }
}

如果我得到完整的 10 个数据结果,程序本身不会崩溃,但是当我从 Web 服务中得到的数据少于 10 个时,它就会崩溃。我不断收到此异常,NSRangeException, reason: index 8 beyond bounds [0 .. 4] 但不知道如何处理。

我的表格视图设置:

-(NSInteger) numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

-(NSInteger) table:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return [resultArr count];
}

这是我的 cellForRowAtIndexPath – Tj3n

-(UITableViewCell) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSString *cellIdentifier = @"cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];

    // clear cell
    for ([UIView *view in [cell.contentView subviews]]) {
        if ([view isKindOfClass:[UIView class]]) {
            [view removeFromSuperview];
        }
    }

    UILabel *titleLabel = [[UILabel alloc] init];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    } else {
        titleLabel = [cell.contentView viewWithTag:100];
    }

    CGRect location = CGRectMake(20, 20, 71/75, 40/146);
    titleLabel = [[UILabel alloc] initWithFrame:location];
    titleLabel.textAlignment = NSTextAlignmentNatural;
    titleLabel.text = [resultArr valueForKey:@"title"][indexPath.row];  // this is the line always crashed
    [cell.contentView addSubview:titleLabel];

    return cell;
}

也在更新我的 json:

print out result: [
    {
    Content = "Test\nTest\n";
    "Create_Datetime" = "2016-09-12 10:18:25";
    "Project_ID" = 2023;    
    Status = 4;    
    "CASE_NO" = 17704;
    Title = "Table title";
    "Update_Datetime" = "2016-09-12 10:19:09";
},
    {
    Content = "Fhujhfdfhjoookbvv\nGu...";
    "Create_Datetime" = "2016-09-12 10:09:28";
    "Project_ID" = 2023;
    Status = 4;
    "CASE_NO" = 17703;
    Title = "Table title";
    "Update_Datetime" = "2016-09-12 10:12:59";
},
    {
    Content = dafsdfasfasfas;
    "Create_Datetime" = "2016-09-04 01:52:09";
    "Project_ID" = 2023;
    Status = 5;
    "CASE_NO" = 16512;
    Title = "Table title";
    "Update_Datetime" = "2016-09-14 16:44:46";
},
    {
    Content = dafsdfa;
    "Create_Datetime" = "2016-09-04 01:41:59";
    "Project_ID" = 2023;
    Status = 4;
    "CASE_NO" = 16511;
    Title = "Table title";
    "Update_Datetime" = "2016-09-04 01:42:23";
},
    {
    Content = sdfasfasf;
    "Create_Datetime" = "2016-09-02 14:14:39";
    "Project_ID" = 2023;
    Status = 2;
    "CASE_NO" = 16502;
    Title = "Table title Table subtitle";
    "Update_Datetime" = "2016-09-02 15:17:50";
}]

更新: 我试图在崩溃前在不同的地方打印出数组计数的日志。

第一名是before table reload,数组中的对象个数是5。

第二名在cellForRowsAtIndexpath。我有 2 件物品要打印出来

  1. resultArr的总数为5,与数组一致 重新加载前计数。
  2. 当前indexpath.row。这里发生的奇怪事情是它在第 8 个单元格而不是第 5 个

最后,我打印日志的地方在numberOfRowsInSection。应用程序崩溃之前,它不会打印出日志。

我认为您获得标题的方式有问题,而不是 titleLabel.text = [resultArr valueForKey:@"title"][indexPath.row];,您可以尝试以下方法吗?如果这不起作用,您能否打印出每个值的值,即 'dictionary' 和 'title' 的值是多少。

NSDictionary *dictionary = [resultArr objectAtIndex:indexPath.row];
NSString *title = [dictionary objectForKey:@"Title"]; 
titleLabel.text = title;

NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 5 beyond bounds for empty array'

谢谢JingJingTao和Tj3n的帮助。

我终于找到了这个错误的答案,但我仍然无法弄清楚这个错误的原因和原因。从逻辑上讲,它应该首先转到 numberOfRowsInSection 来设置当前 table 的行数,但显然它没有。有人可以解释这是为什么吗?