cellForRowAtIndexPath调用为时已晚

Question

每当从网络获取的一些数据可用时，我都试图重新加载表。 这就是我所拥有的：

SearchDataViewController:

- (void)parseDataXML {
    parsingDelegate = [[XMLParsingDelegate alloc] init];    
    parsingDelegate.searchDataController = self;
    // CONTAINS THE TABLE THAT NEEDS RE-LOADING;    
    ImplementedSearchViewController *searchController = [[ImplementedSearchViewController alloc] initWithNibName:@"ImplementedSearchView" bundle:nil];

    ProjectAppDelegate *delegate = [[UIApplication sharedApplication] delegate];
    UINavigationController *nav = (UINavigationController *)[delegate.splitViewController.viewControllers objectAtIndex: 0];
    NSArray *viewControllers = [[NSArray alloc] initWithObjects:nav, searchController, nil];
    self.splitViewController.viewControllers = viewControllers;
    [viewControllers release];
    // PASS A REFERENCE TO THE PARSING DELEGATE SO THAT IT CAN CALL reloadData on the table     
    parsingDelegate.searchViewController = searchController;

    [searchController release];

    // Build the url request used to fetch data
    ... 
    NSURLRequest *dataURLRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:dataURL]];
        parsingDelegate.feedConnection = [[[NSURLConnection alloc] initWithRequest:dataURLRequest delegate:parsingDelegate] autorelease];

}


ImplementedSearchViewController:

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    NSLog(@"count = %d", [keys count]);
    // keys IS A NSMutableArray
    return [self.keys count];    
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    ...
    cell.textLabel.text = [keys objectAtIndex:row];
    ...
}


XMLParsingDelgate:

-(void) updateSearchTable:(NSArray *)array {
    ...
    [self.currentParseBatch addObject:(NSString *)[array objectAtIndex:1]];
    // RELOAD TABLE
    [self.searchViewController.table reloadData];
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName
  namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName
    attributes:(NSDictionary *)attributeDict {

    if ([elementName isEqualToString:@"..."]) {
        self.currentParseBatch = [NSMutableArray array];
        searchViewController.keys = self.currentParseBatch;
                ...
    }
        ...
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName
  namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
    if ([elementName isEqualToString:@"..."]) {
                ...
        [self performSelectorOnMainThread:@selector(updateSearchTable:) withObject:array waitUntilDone:NO];
        }
        ...     
}

我的问题是，当我调试时，调用会在reloadData和numberOfRowsInSection之间进行，直到keys数组中填充了最后一个数据，即cellForRowAtIndexPath的调用时间：

reloadData -> numberOfRowsInSection
reloadData -> numberOfRowsInSection
...
reloadData -> numberOfRowsInSection -> cellForRowAtIndexPath

我想要的是表格针对我发送的每个元素进行更新，一个接一个：

reloadData -> numberOfRowsInSection -> cellForRowAtIndexPath
reloadData -> numberOfRowsInSection -> cellForRowAtIndexPath
...
reloadData -> numberOfRowsInSection -> cellForRowAtIndexPath

任何想法为什么这种行为？

谢谢！

Answer 1

您是否在问如何加载整个表视图的一部分？ 如果是这样，那么您可以为此目的使用relaodRowsAtINdexPath：或reloadSectionsAtIndexPath，这是参考TableView ref ...

Answer 2

从[self performSelectorOnMainThread:@selector(updateSearchTable:) withObject:array waitUntilDone:NO]; 到[self performSelectorOnMainThread:@selector(updateSearchTable:) withObject:array waitUntilDone:YES]; 解决了我的问题。

Answer 3

问题出在您使用线程而不仅仅是“仅”打开或关闭标志。在不同线程上执行选择器，它将开始起作用。您还可以使用performSelectorOnBackground