UIKeyboard通知的最佳实践 - iPhone SDK

NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(_:)), name: UIResponder.keyboardWillHideNotification, object: nil)

@objc func keyboardWillShow(_ notification: Notification) {
    // 处理键盘将要显示的逻辑
}

@objc func keyboardWillHide(_ notification: Notification) {
    // 处理键盘将要隐藏的逻辑
}

if let userInfo = notification.userInfo,
   let keyboardFrame = userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect,
   let animationDuration = userInfo[UIResponder.keyboardAnimationDurationUserInfoKey] as? TimeInterval {
    let keyboardHeight = keyboardFrame.height
    // 使用键盘信息执行相应的操作
}