先上效果
效果图
用到的变量
@IBOutlet weak var textView: UITextView!
//mark: 记录UITextView的原始高度
var textViewHeight: CGFloat!
viewDidLoad
//获取原始位置
textViewHeight = textView.frame.origin.y
//注册监听
NotificationCenter.default.addObserver(self, selector: #selector(handleKeyboardDisShow(notification:)), name: NSNotification.Name.UIKeyboardDidShow, object: nil)
handleKeyboardDisShow
//mark: 当键盘显示时
func handleKeyboardDisShow(notification: NSNotification) {
//得到键盘frame
let userInfo: NSDictionary = notification.userInfo! as NSDictionary
let value = userInfo.object(forKey: UIKeyboardFrameEndUserInfoKey)
let keyboardRec = (value as AnyObject).cgRectValue
let height = keyboardRec?.size.height
//让textView bottom位置在键盘顶部
UITextView.animate(withDuration: 0.1, animations: {
var frame = self.textView.frame
frame.origin.y = height!
self.textView.frame = frame
})
}
textFieldShouldReturn
//mark: 输入框enter回车事件
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
//让textView bottom位置还原
UITextView.animate(withDuration: 0.1, animations: {
var frame = self.textView.frame
frame.origin.y = self.textViewHeight
self.textView.frame = frame
})
return true
}
注销监听
deinit {
//移除监听
NotificationCenter.default.removeObserver(self)
}
