iOS Why can't scroll table view when downloading

[mikezang]

I am using a table view and download data using performSelectorInBackground, but I found I can scroll table view when I download, what can I do?
Thanks for your suggestion.

 

[robbieduncan]

Post your code. It sounds like you are blocking the main thread.

 

[mikezang]

I have a table view controller as below:

@interface MasterTableViewController : UITableViewController {
    MonthData *monthData;
	
    DetailViewController *detailViewController;
}

The MonthData class as below

@interface MonthData : NSObject <NewerFileDownloadDelegate> {
    NSArray *allData;
    NewerFileDownload *download;
}

- (void)downloadData {
    [download start];
}

The class NewerFileDownload is a wrapper class for ASINetworkQueue/ASIHttpRequest. it looks like as below:

@interface NewerFileDownload : NSObject {
    ASINetworkQueue *networkQueue;
    ASIHTTPRequest *request;
	
    id delegate;
}

- (void)start {
    request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:fileName]];
	
    [networkQueue addOperation:request];
    [networkQueue go];
}

When I click download button, I call code as below:

- (IBAction)download:(id)sender {
    [self performSelectorInBackground:@selector(downloadEvents) withObject:nil];
}

- (void)downloadEvents {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    [monthData downloadData];
    [pool release];
}

 

[Luke Redpath]

ASIHTTP is already using an operation queue to perform the network request asynchronously; there is no need for you to call this selector on a background thread.

 

[mikezang]

ASIHTTP is already using an operation queue to perform the network request asynchronously; there is no need for you to call this selector on a background thread.

I knew it, I use it in background because I can't scroll my view when downloading.