ios swift4 키보드 숨기기 두가지 방법. keyboard dismiss.

[ios swift4 키보드 숨기기 두가지 방법]

방법 1  : 

1 ) Extension 추가

extension UIViewController
{
    func hideKeyboard()
    {
        let tap: UITapGestureRecognizer = UITapGestureRecognizer(
            target: self,
            action: #selector(UIViewController.dismissKeyboard))
        view.addGestureRecognizer(tap)
    }
    @objc func dismissKeyboard()
    {
        view.endEditing(true)
    }
}
 

2) viewDidLoad() 에 추가

    override func viewDidLoad() {
        
        super.viewDidLoad()
        self.hideKeyboard()
        
    }

방법 2 : (불안정)

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.view.endEditing(true)
    }