自动布局问题 Swift 3.0

我已经Autolayout这个屏幕截图使用。我想当我点击textView，textView 将始终位于键盘上方，而且我正在使用自定义NavigationBar.我已经用过IQKeyBoardManagerSwift它正在工作，但是我的NavigationBar也向上移动我想要我的NavigationBar如果我单击 textView，则会粘在顶部。对此的任何解决方案。提前致谢

雨燕5.0:- 拖动你的UITextView in a contentView(UIView)， 创造IBOutletcontentView 的底部约束，即bottomConstraint。使用下面提到的和自定义的代码后NavigationBar也将停留在顶部，只有 textView 将位于键盘上方。

 override func viewDidLoad() {
    super.viewDidLoad()
    let center: NotificationCenter = NotificationCenter.default
    center.addObserver(self, selector: #selector(Profile.keyboardWillShow(notification:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    center.addObserver(self, selector: #selector(Profile.keyboardWillHide(notification:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}

@objc func keyboardWillShow(notification: NSNotification){

let userInfo:NSDictionary = notification.userInfo! as NSDictionary
let keyboardSizeNow:CGSize = (userInfo.object(forKey: UIKeyboardFrameEndUserInfoKey)! as AnyObject).cgRectValue.size
UIView.animate(withDuration: 0.2, animations: { () -> Void in
    self.bottomConstraint.constant = keyboardSizeNow.height - 49
    self.view.layoutIfNeeded()
 })
}

@objc func keyboardWillHide(notification: NSNotification){
    UIView.animate(withDuration: 0.2, animations: { () -> Void in
        self.bottomConstraint.constant = 0
        self.view.layoutIfNeeded()
    })
}