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- (IBAction)fetchGreeting;
{
    NSURL *url = [NSURL URLWithString:@"http://rest-service.guides.spring.io/greeting"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [NSURLConnection sendAsynchronousRequest:request
                                       queue:[NSOperationQueue mainQueue]
                           completionHandler:^(NSURLResponse *response,
                                               NSData *data, NSError *connectionError)
     {

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// UIAlertController example. 'UIAlertView' is deprecated: first deprecated in iOS 9.0 - UIAlertView is deprecated. 
// Use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert instead
// More at: http://useyourloaf.com/blog/uialertcontroller-changes-in-ios-8/
- (void) handleError{
    UIAlertController *alertController = [UIAlertController
                                          alertControllerWithTitle:nil
                                          message:@"Incorrect Credentials"
                                          preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *okAction = [UIAlertAction
                               actionWithTitle:NSLocalizedString(@"OK", @"OK action")

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// More at http://code.tutsplus.com/tutorials/networking-with-nsurlsession-part-1--mobile-21394
// More samples at: http://hayageek.com/ios-nsurlsession-example/
- (void)viewDidLoad {
    [super viewDidLoad];
 
    NSURLSession *session = [NSURLSession sharedSession];
    NSURLSessionDataTask *dataTask = [session dataTaskWithURL:[NSURL URLWithString:@"https://itunes.apple.com/search?term=apple&media=software"] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
        NSLog(@"%@", json);
    }];

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dispatch_async(dispatch_get_main_queue(), ^{
    // This block will be executed asynchronously on the main thread.
});

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UIAlertView *alertView = [[UIAlertView alloc]
                           initWithTitle:@"DefaultStyle" 
                           message:@"the default alert view style"
                           delegate:self 
                           cancelButtonTitle:@"Cancel" 
                           otherButtonTitles:@"OK", nil];

[alertView show];

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    NSString *htmlFile = [[NSBundle mainBundle] pathForResource:@"localHtmlSample" ofType:@"html"];

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- (NSURL *)applicationDocumentsDirectory {
    return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
}

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var appDelegate = UIApplication.sharedApplication().delegate as AppDelegate

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static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
    // Your code here
    });

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#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
// Your code here
#pragma clang diagnostic pop