Question

我正在使用dispatch_async在一个合适的视图中解析xml数据这里是我的代码：

- (void) Parse{
    dispatch_async( dispatch_get_global_queue(0, 0), ^{
     NSString *post =[[NSString alloc] initWithFormat:@"http://messages.xml"];
     NSData *xmlData=[[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:post]];
     xmlParserObject =[[NSXMLParser alloc]initWithData:xmlData];
     [xmlParserObject setDelegate:self];
     dispatch_async( dispatch_get_main_queue(), ^{
     [xmlParserObject parse];
     });
     });
    [messageList reloadData];
}

现在uitableview没有显示任何数据。它在dispatch_async

之前完美运行

Answer 1

我认为您的代码存在问题。请在dispatch_get_main_queue()

中重新加载表格数据

- (void) Parse {
    dispatch_async( dispatch_get_global_queue(0, 0), ^{

        NSString *post =[[NSString alloc] initWithFormat:@"http://messages.xml"];
        NSData *xmlData=[[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:post]];
        xmlParserObject =[[NSXMLParser alloc]initWithData:xmlData];
        [xmlParserObject setDelegate:self];
        [xmlParserObject parse];
        dispatch_async( dispatch_get_main_queue(), ^{
            [messageList reloadData];
        });
    });    
}

dispatch_async与xml解析器不工作

1 个答案: