[tableView reloadData];在我滚动tableView之前不工作。

I have a simple app that downloads search results in XML when the user types in a UISearchBar. The download+parsing is threaded and once done it fires an NSNotification to tell the ViewController with the table view to [tableView reloadData];

我有一个简单的应用程序，当用户在UISearchBar中输入时，它会在XML中下载搜索结果。下载+解析是线程化的，一旦完成，它就会触发一个NSNotification，告诉视图控制器以表视图到[tableView reloadData];

Here is the code that receives the notification fired once results are in:

以下是收到结果时收到通知的代码:

- (void)receivedResults:(id)notification {
    results = [notification object];
    DLog(@"Received %i results",[results count]);
    [[self tableView] reloadData];
}

I get the log output "Received 4 results", but the table view doesn't reload the data until I scroll/drag it a couple pixels. I am using the built-in UITableViewCellStyleSubtitle cell style and im not changing the height or ding anything fancy with the table view.

我得到了“收到4个结果”的日志输出，但是表视图不会重新加载数据，直到我滚动/拖动它几个像素。我正在使用内置的UITableViewCellStyleSubtitle单元格样式，我不会更改高度或设置任何与表格视图有关的东西。

What am I doing wrong?

我做错了什么?

5 个解决方案

#1

I was able to get the same thing to work. But the issue was that the reload data needed to be called on main thread.

我也能做同样的事情。但问题是需要在主线程上调用重载数据。

dispatch_async(dispatch_get_main_queue(), ^{
    [self.tableView reloadData];
});

I think this is more practical than the performSelectorOnMainThread option

我认为这比performSelectorOnMainThread选项更实用。

#2

Call

调用

[self.tableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:NO];

instead of

而不是

[self.tableview reloadData]

#3

My problem was that I was posting a NSNotification from a background thread. To avoid this, simply wrap your postNotificationMethod in a dispatch_async method like this:

我的问题是，我从后台线程发布了一个NSNotification。为了避免这种情况，只需在dispatch_async方法中封装您的postNotificationMethod:

dispatch_async(dispatch_get_main_queue(), ^{
    [[NSNotificationCenter defaultCenter] postNotificationName:@"FinishedDownloading" object:result];
});

When this notification will be received, the tableView.reloadData will be called on the main thread.

当收到此通知时，tableView。将在主线程上调用reloadData。

#4

I have the same problem, and I have tried all the solution I can find on google. But All of them don't work.

我有同样的问题，我已经尝试了所有在谷歌上找到的解决方案。但它们都不起作用。

At last I found that I add observer before viewDidLoad, and then [self.tableView reloadData] is not working.

最后，我发现我在viewDidLoad之前添加了observer，然后(self)。tableView reloadData不工作。

First I call the setObserverForUserInfoDatabase in the viewDidLoad of my root navigation view controller. Because I think it was called earlier. The function is like this:

首先，在我的根导航视图控制器的viewDidLoad中调用setObserverForUserInfoDatabase。因为我认为它是更早的。函数是这样的:

- (void)setObserverForUserInfoDatabase:(NSString *)name {
    [[NSNotificationCenter defaultCenter] addObserverForName:name
                                                      object:nil
                                                       queue:nil
                                                  usingBlock:^(NSNotification *note) {
                                                      [self loadUserInfo];
                                                      [self.tableView reloadData];
                                                      NSLog(@"User Panel Notification \n %@", self);
                                                  }];}

Then I move the code into viewDidLoad of the viewController itself.

然后我将代码移到viewController本身的viewDidLoad中。

- (void)viewDidLoad {
    NSLog(@"View Did Load");
    [super viewDidLoad];

    [self setObserverForUserInfoDatabase:UserInfoDataBaseAvailabilityNotification];
}

And then everything works fine.

然后一切正常。

I don't know the reason yet. If anyone knows please tell me.

我还不知道原因。如果有人知道请告诉我。

#5

reload your tableView in viewWillLayoutSubviews

在viewWillLayoutSubviews中重新加载tableView。

#1