swift3 - 自动布局问题 Swift 3.0

Question

我已经使用了Autolayout此屏幕截图。我希望​​当我单击时textView，textView 将始终位于键盘上方，并且我正在使用自定义NavigationBar。我已经使用IQKeyBoardManagerSwift它正在工作，但我NavigationBar也向上移动我希望我NavigationBar在单击 textView 时保持在顶部。对此的任何解决方案。提前致谢

Answer 1

Swift 5.0：- 将您UITextView的内容拖入一个contentView(UIView)，创建IBOutletcontentView 的底部约束，即bottomConstraint。使用下面提到的代码后，自定义NavigationBar也会粘在顶部，只有 textView 会在键盘上方。

 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()
    })
}

Answer 2

你可以用类似的方式实现keyboardWillShow和keyboardWillHide方法

func keyboardWillShow(notification: NSNotification) {

        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
            buttonBottomConstraint.constant = keyboardSize.height
            UIView.animate(withDuration: 0.3, animations: {
                self.view.layoutIfNeeded()
            })
        }
    }
    func keyboardWillHide(notification: NSNotification) {
        if let _ = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
            bottomConstraint.constant = 0
            UIView.animate(withDuration: 0.3, animations: {
                self.view.layoutIfNeeded()
            })
        }
    }

另外，不要忘记在 viewDidLoad 中观察。