CODEWITHSUNDEEP
iphonecocoa-touch
D33
D33

Reputation: 239

UITableView reloaddata doesn't reload immediately

I'm trying to work with online data in my iPhone app. But I'm getting mad because of this:

I have object for downloading data with NSURLConnection. Method starting the work with connection (and other stuff) in separate thread - [ NSThread detachNewThreadSelector:@selector( doConnectionInNewThread ) toTarget: self withObject: nil ];

When data are loaded (connectionDidFinishLoading) I give them to my viewController. This all stuff works fine. When I use breakpoints or NSLog I have the data ready to show in UITableView. When I call reloadData, nothing happens immediately. It reloads data after maybe 2 seconds (- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath is called after this delay).

BUT when I slide the tableView, it reloads data immediately. So the connection and so on works fine but it just doesn't reload the data. Why? I thought it could be due to blocked mainThread by URLConnection. But now I use it in separate thread and it is still the same...

Upvotes: 0

Views: 1444

Answers (2)

Sina.Moradbakhti
Sina.Moradbakhti

Reputation: 51

Your tableView.reloadData function probably doesn't run in main thread so you should use tableview.reloadData() in DispatchQueue.main.async to run that in the main thread.

example:

DispatchQueue.main.async {
  tableview.reloadData()
}

Upvotes: 0

Julien
Julien

Reputation: 3477

Are you accessing your table view in the detached thread?

Make sure to update the UI on the main thread using:

-performSelectorOnMainThread:withObject:waitUntilDone:

Upvotes: 2

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