Question

While parsing of the twitter data, I used threads to call the main URL to download the data. It does the downloading perfectly but when I hit the back button while the data is downloading it throws performSelectorOnMainThread message deallocated. I know we can use isCancelled but its not working for me yet. Does anyone have come across this issue and have resolved it.

- (void)LoadTwitterData
{
NSString *urlString =@"http://search.twitter.com/search.json?q=tabc&result_type=recent&rpp=2500";
NSURL *url = [NSURL URLWithString:urlString];

NSString *jsonString = [NSString stringWithContentsOfURL:url];
NSDictionary *values = [jsonString JSONValue];    

/**** Throws here *****/
[self performSelectorOnMainThread:@selector(didFinishLoadingResults:) withObject:values waitUntilDone:NO];

}

Answer 1

If LoadTwitterData: is in a background thread, you need to create an Auto release pool (If you haven’t already). Surround your code with-

NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];


//your code

[pool drain];