用uiTextView关闭键盘

这对我有用：

import UIKitclass ViewController: UIViewController, UITextViewDelegate {    @IBOutlet weak var textView: UITextView!    override func viewDidLoad() {        super.viewDidLoad()        textView.delegate = self    }        func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {        if(text == "n") { textView.resignFirstResponder() return false        }        return true    }        func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {        if(text == "n") { textView.resignFirstResponder() return false        }        return true    }}