开发需求：对键盘弹出及隐藏事件进行监听
需要通过NotificationCenter对键盘事件进行监听
//键盘即将弹出
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardShow(note:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
//键盘即将隐藏
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardHidden(note:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
//键盘弹出监听
@objc func keyboardShow(note: Notification) {
guard let userInfo = note.userInfo else {return}
guard let keyboardRect = userInfo[UIKeyboardFrameEndUserInfoKey] as? CGRect else{return}
//获取键盘弹起的高度
let keyboardTopYPosition = SCREENHEIGHT - keyboardRect.height
}
//键盘隐藏监听
@objc func keyboardHidden(note: Notification){
}
//取消键盘监听
deinit {
NotificationCenter.default.removeObserver(self)
}
如果要监听键盘完全弹起或隐藏后进行操作，则使用
//注意，这里使用的是UIKeyboardDidShow
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardShow(note:)), name: NSNotification.Name.UIKeyboardDidShow, object: nil)
//注意，这里使用的是UIKeyboardDidHide
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardHidden(note:)), name: NSNotification.Name.UIKeyboardDidHide, object: nil)
