swift3 键盘通知事件

概述class MyViewController: UIViewController {// This constraint ties an element at zero points from the bottom layout guide@IBOutlet var keyboardHeightLayoutConstraint: NSLayoutConstraint?override f

class MyVIEwController: UIVIEwController {// This constraint tIEs an element at zero points from the bottom layout guIDe@IBOutlet var keyboardHeightLayoutConstraint: NSLayoutConstraint?overrIDe func vIEwDIDLoad() {    super.vIEwDIDLoad()    // Note that SO highlighting makes the new selector Syntax (#selector()) look    // like a comment but it isn't one    NotificationCenter.default.addobserver(self,selector: #selector(self.keyboardNotification(notification:)),name: NSNotification.name.UIKeyboarDWillChangeFrame,object: nil)}deinit {    NotificationCenter.default.removeObserver(self)}@objc func keyboardNotification(notification: NSNotification) {    if let userInfo = notification.userInfo {        let endFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue        let duration:TimeInterval = (userInfo[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue ?? 0        let animationCurveRawNSN = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? NSNumber        let animationCurveRaw = animationCurveRawNSN?.uintValue ?? UIVIEwAnimationoptions.curveEaseInOut.rawValue        let animationCurve:UIVIEwAnimationoptions = UIVIEwAnimationoptions(rawValue: animationCurveRaw)        if (endFrame?.origin.y)! >= UIScreen.main.bounds.size.height {            self.keyboardHeightLayoutConstraint?.constant = 0.0        } else {            self.keyboardHeightLayoutConstraint?.constant = endFrame?.size.height ?? 0.0        }        UIVIEw.animate(withDuration: duration,delay: TimeInterval(0),options: animationCurve,animations: { self.vIEw.layoutIfNeeded() },completion: nil)    }}

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