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我有一个表视图,其中包含使用 NSXML 解析器解析的 xml 链接列表,然后将解析结果推送到新视图。但是,它的行为非常奇怪。解析操作发生在用户选择单元格时,然后使用 NSXML 委托方法 didEndDocument,它通知带有 tableview 的对象继续并推送由解析结果填充的新视图控制器。在推送到新视图之前,我使用结果检查数组以确保它不为空。如果是,我不会推送新视图而只显示警报视图。每当我选择一个我知道将返回填充数组的单元格时,它都会认为该数组是空的并且不会推送视图。但随后我再次选择单元格并将其推送到新视图,显示正确的数据。它不会在解析操作完成之前过早地推送到新的视图控制器,除非过早调用 didEndDocument 委托方法。任何帮助将不胜感激。

代码:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];

    activity = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    activity.center = selectedCell.accessoryView.center;

    selectedCell.accessoryType = UITableViewCellAccessoryNone;
    selectedCell.accessoryView = activity;

    [activity startAnimating];

    departmentName = [[sortedArray objectAtIndex:indexPath.row] objectForKey:@"name"];

    [self performSelector:@selector(parse:) withObject:[[sortedArray objectAtIndex:indexPath.row] objectForKey:@"link"] afterDelay:0];

    [tableView deselectRowAtIndexPath:indexPath animated:YES];
}

- (void)parse:(NSString *)link {

    NSLog(@"Link = %@", link);

    kxmlParser = [[KMXMLParser alloc] loadXMLByURL:link delegate:self];
}

- (void)parserDidStartDocument:(NSXMLParser *)parser {

    NSLog(@"Did Start");
}

- (void)parserDidEndDocument:(NSXMLParser *)parser {

    NSLog(@"Did End");

    NSLog(@"Array = %@", kxmlParser.posts);

    [activity stopAnimating];

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard_iPhone" bundle: nil];
    MainViewController *main = [storyboard instantiateViewControllerWithIdentifier:@"main"];
    [main setDepartmentname:departmentName];

    [self.navigationController pushViewController:main animated:YES];
}
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