StackOverflow2013

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copied!<p>I am using JSON to get data from web service.The problem is When i call web service and due to slow response my app become unresponsive for few seconds and some times crash.</p> <p>I search a lot and found that by making Asynchronous call instead of Synchronous call can solve problem. But how to use asynchronous call that i don't know.</p> <p>My code is like..</p> <pre><code>SBJSON *json = [SBJSON new]; json.humanReadable = YES; responseData = [[NSMutableData data] retain]; NSString *service = @"/Get_NearbyLocation_list"; double d1=[[[NSUserDefaults standardUserDefaults]valueForKey:@"LATITUDE"] doubleValue]; NSLog(@"%f",d1); double d2=[[[NSUserDefaults standardUserDefaults]valueForKey:@"LONGITUDE"] doubleValue]; NSLog(@"%f",d2); NSString *requestString = [NSString stringWithFormat:@"{\"current_Lat\":\"%f\",\"current_Long\":\"%f\"}",d1,d2]; NSLog(@"request string:%@",requestString); // NSString *requestString = [NSString stringWithFormat:@"{\"GetAllEventsDetails\":\"%@\"}",service]; NSData *requestData = [NSData dataWithBytes: [requestString UTF8String] length: [requestString length]]; NSString *fileLoc = [[NSBundle mainBundle] pathForResource:@"URLName" ofType:@"plist"]; NSDictionary *fileContents = [[NSDictionary alloc] initWithContentsOfFile:fileLoc]; NSString *urlLoc = [fileContents objectForKey:@"URL"]; urlLoc = [urlLoc stringByAppendingString:service]; NSLog(@"URL : %@",urlLoc); NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString: urlLoc]]; NSString *postLength = [NSString stringWithFormat:@"%d", [requestData length]]; [request setHTTPMethod: @"POST"]; [request setValue:postLength forHTTPHeaderField:@"Content-Length"]; [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; [request setHTTPBody: requestData]; // self.connection = [NSURLConnection connectionWithRequest:request delegate:self]; NSError *respError = nil; NSData *returnData= [NSURLConnection sendSynchronousRequest: request returningResponse: nil error: &respError ]; if (respError) { UIAlertView *alt=[[UIAlertView alloc]initWithTitle:@"Internet connection is not Available!" message:@"Check your network connectivity" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil]; [alt performSelectorOnMainThread:@selector(show) withObject:nil waitUntilDone:YES]; [alt release]; [customSpinner hide:YES]; [customSpinner show:NO]; } else { NSString *responseString = [[NSString alloc] initWithData:returnData encoding: NSUTF8StringEncoding]; NSLog(@" %@",responseString); NSDictionary *results = [[responseString JSONValue] retain]; NSLog(@" %@",results); </code></pre> <p>thanks in advance..</p>

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