Add a custom gesture recognizer to a view from a raywenderlich tutorial

ViewController.m

- (void)viewDidLoad
{
    [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
    
    for (UIView *view in self.view.subviews)
    {
        // this is how you programmatically add a gustom gesture recognizer
        UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
        recognizer.delegate=self;
        [view addGestureRecognizer:recognizer];
        
        // todo - add a custom gesture recognizer too
    }
}