How to dismiss keyboard iOS programmatically

How to dismiss keyboard iOS programmatically

I created a UITextField programmatically making the UITextField a property
of the viewController. I need to dismiss the keyboard with the return and
the touch on the screen. I was able to get the screen touch to dismiss,
but pressing return is not working.
I've seen how to do it with storyboards and by allocating and initializing
the UITextField object directly without creating it as a property.
Possible to do? I am a noob - sorry!
.h
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController <UITextFieldDelegate>
@property (strong, atomic) UITextField *username;
@end
.m
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.view.backgroundColor = [UIColor blueColor];
self.username = [[UITextField alloc] initWithFrame:CGRectMake(100, 25,
80, 20)];
self.username.placeholder = @"Enter your username";
self.username.backgroundColor = [UIColor whiteColor];
self.username.borderStyle = UITextBorderStyleRoundedRect;
if (self.username.placeholder != nil) {
self.username.clearsOnBeginEditing = NO;
}
_username.delegate = self;
[self.view addSubview:self.username];
[_username resignFirstResponder];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(@"touchesBegan:withEvent:");
[self.view endEditing:YES];
[super touchesBegan:touches withEvent:event];
}
@end