xcodeで非同期通信

前回の投稿で非同期通信の仕方ができるようになりたいと書いたのですが、やってみたら意外とすぐできたので書いておきます

- (IBAction)asynchronousConnection:(id)sender {
    NSString *query = [NSString stringWithFormat:@"sample=%@", @"sample"];
    NSData *queryData = [query dataUsingEncoding:NSUTF8StringEncoding];
    
    NSString *url = @"http://localhost/sample/index.php";
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc]init];
    [request setURL:[NSURL URLWithString:url]];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:queryData];
    
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
    [NSURLConnection connectionWithRequest:request delegate:self];
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    NSLog(@"receive response");
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    NSError *jsonError;
    NSMutableArray *returnedData = [[NSMutableArray alloc] init];
    returnedData = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&jsonError];
    NSLog(@"%@", returnedData);
}
- (void)connectionDidFinishLoading: (NSURLConnection *)connection {
　[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    NSLog(@"finish connection");
}