Ejemplo de como usar NSURLSession

NSURLSession

#import "WSConsult.h"
@interface WSConsult()<NSURLSessionDelegate>

@end
@implementation WSConsult
+(WSConsult *)sharedInstance {
    static dispatch_once_t pred;
    static WSConsult *shared = nil;
    
    dispatch_once(&pred, ^{
        shared = [[WSConsult alloc] init];
    });
    return shared;
}
+(void)getInfoFacebook{
    NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];
    NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate: nil delegateQueue: [NSOperationQueue mainQueue]];
    
    NSURL * url = [NSURL URLWithString:@"http://kodebinario.com/get"];
    
    NSURLSessionDataTask * dataTask = [defaultSession dataTaskWithURL:url
                                                    completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                                        if(error == nil)
                                                        {
                                                            NSString * text = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
                                                            NSLog(@"Data = %@",text);
                                                        }
                                                        
                                                    }];
    
    [dataTask resume];

}