swift3 键盘通知事件
发布时间:2020-12-14 06:08:22 所属栏目:百科 来源:网络整理
导读: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() // N
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) } } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |