iOS example

ios.c

// Async web fetch with JSON parse

    [NSURLConnection sendAsynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"url"]]
                                       queue:nil completionHandler:^(NSURLResponse *r, NSData *d, NSError *e) {
                                           NSDictionary *json = [NSJSONSerialization JSONObjectWithData:d
                                                                                                options:0
                                                                                                  error:nil];
                                       }];

// Using the camera 
- (void)takePicture:(id)sender
{
    UIImagePickerController *c = [[UIImagePickerController alloc] init];
    [c setDelegate:self];
    [self presentViewController:c animated:YES completion:nil];
}

- (void)imagePickerController:(UIImagePickerController *)ipc didFinishPickingMediaWithInfo:(NSDictionary *)d
{
    UIImage *img = [d objectForKey:UIImagePickerControllerOriginalImage];
}