Block ex

gistfile1.m

-(void)executeBlockRequest:(void (^)(NSJSONSerialization *, MSJSonError *))handler
{
    [NSURLConnection sendAsynchronousRequest:[self constructRequest] queue:[NSOperationQueue currentQueue] completionHandler:^(NSURLResponse *res, NSData *data, NSError *error){
        NSJSONSerialization *json = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil]; 
        if (error) {
            MSJSonError *errorRest = [[MSJSonError alloc]init]; 
            errorRest.name = error.description;
            errorRest.name = error.description; 
            handler(json, errorRest); 
        }
        else {
            NSDictionary *dic = (NSDictionary *)json; 
            if ([dic objectForKey:@"errors"]) {
                NSArray *errors = [dic objectForKey:@"errors"];
                MSJSonError *errorRest = [[MSJSonError alloc]initWithDictionnary:[errors objectAtIndex:0]]; 
                handler(json, errorRest); 
            }
            else {
                handler(json, nil); 
            }

        }
    }]; 
}