只需将文本框包含在视图中，然后覆盖返回视图的inputAccessoryView。 重要:您的视图应该以编程方式创建。不要使用@IBOutlets。

 override var inputAccessoryView: UIView? {
    get {
        return newlyProgramaticallyCreatedView
    }}

如果你像我一样尝试了以上所有的解决方案，但你的问题仍然没有解决，我有一个很棒的解决方案，它就像一个魅力。首先我想澄清一下上面提到的一些解决方案。

In my case IQkeyboardmanager was working only when there is no auto layout applied on the elements, if it is applied then IQkeyboard manager will not work the way we think. Same thing with upward movement of self.view. i have wriiten a objective c header with a swift support for pushing UITexfield upward when user clicks on it, solving the problem of keyboard covering the UITextfield : https://github.com/coolvasanth/smart_keyboard. One who has An intermediate or higher level in iOS app development can easily understand the repository and implement it. All the best

我正在使用swift 4，我解决了这个问题，没有使用任何额外的底部约束，看我的代码在这里。这对我的案子很有帮助

1)在did load中添加通知观察者

override func viewDidLoad() { super.viewDidLoad () setupManager () //加载视图后进行任何额外的设置。 addobserver (self, selector: #selector(self. keyboardwillshow)， name: NSNotification.Name。对象:nil) addobserver (self, selector: #selector(self. keyboardwillhide)， name: NSNotification.Name。对象:nil) ｝

2)删除通知观察者

Deinit { NotificationCenter.default.removeObserver（self） }

3)增加键盘显示/隐藏方法

 @objc func keyboardWillShow(notification: NSNotification) {
            if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
                UIView.animate(withDuration: 0.1, animations: { () -> Void in
                    self.view.frame.origin.y -= keyboardSize.height
                    self.view.layoutIfNeeded()
                })
            }
        }

@objc func keyboardWillHide(notification: NSNotification) {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
            UIView.animate(withDuration: 0.1, animations: { () -> Void in
                self.view.frame.origin.y += keyboardSize.height
                self.view.layoutIfNeeded()
            })
        }
    }

4)添加textfield delegate和touchesBegan方法。usefull用于在屏幕上的textfield外触摸时隐藏键盘

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        view.endEditing(true)

    }

我的做法如下:

class SignInController: UIViewController , UITextFieldDelegate {

@IBOutlet weak var scrollView: UIScrollView!

// outlet declartion
@IBOutlet weak var signInTextView: UITextField!

var kbHeight: CGFloat!

/**
*
* @method viewDidLoad
*
*/

override func viewDidLoad() {
    super.viewDidLoad()

    self.signInTextView.delegate = self

}// end viewDidLoad

/**
*
* @method viewWillAppear
*
*/

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)

    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil)

    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name: UIKeyboardWillHideNotification, object: nil)

}// end viewWillAppear

/**
*
* @method viewDidAppear
*
*/

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)


}// end viewDidAppear

/**
*
* @method viewWillDisappear
*
*/
override func viewWillDisappear(animated: Bool) {
    super.viewWillDisappear(animated)
    NSNotificationCenter.defaultCenter().removeObserver(self)
}

/**
*
* @method textFieldShouldReturn
* retun the keyboard value
*
*/

// MARK -
func textFieldShouldReturn(textField: UITextField) -> Bool {
    signInTextView.resignFirstResponder()
    return true;

}// end textFieldShouldReturn

// MARK - keyboardWillShow
func keyboardWillShow(notification: NSNotification) {
    if let userInfo = notification.userInfo {
        if let keyboardSize =  (userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
            kbHeight = keyboardSize.height
            self.animateTextField(true)
        }
    }
}// end keyboardWillShow

// MARK - keyboardWillHide
func keyboardWillHide(notification: NSNotification) {
    self.animateTextField(false)
}// end keyboardWillHide

// MARK - animateTextField
func animateTextField(up: Bool) {
    var movement = (up ? -kbHeight : kbHeight)

    UIView.animateWithDuration(0.3, animations: {
        self.view.frame = CGRectOffset(self.view.frame, 0, movement)
    })
}// end animateTextField

/**
*
* @method didReceiveMemoryWarning
*
*/

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.

}// end didReceiveMemoryWarning


}// end SignInController

斯威夫特4.1,

使用TPKeyBoardAvoiding类来实现这一点。 这与UIScrollView, UICollectionView, UITableView一起工作很好。

只需将这个类分配给storyboard中的scrollview, collectionview或tableview，或以编程方式创建它的对象。 tpkeyboardavoidscrollview内的所有文本字段或文本视图将在键盘出现和消失时自动调整。

这里是tpkeyboardavoidance的链接

tpkeyboardavoidance for Swift 4.1，

import Foundation
import UIKit

// MARK: - TableView
class TPKeyboardAvoidingTableView:UITableView,UITextFieldDelegate, UITextViewDelegate {

    override var frame:CGRect{
        willSet{
            super.frame = frame
        }

        didSet{
            if hasAutomaticKeyboardAvoidingBehaviour() {return}
            TPKeyboardAvoiding_updateContentInset()
        }
    }

    override var contentSize:CGSize{
        willSet(newValue){
            if hasAutomaticKeyboardAvoidingBehaviour() {
                super.contentSize = newValue
                return
            }

            if newValue.equalTo(self.contentSize)
            {
                return
            }

            super.contentSize = newValue
            self.TPKeyboardAvoiding_updateContentInset()
        }

        //        didSet{
        //            self.TPKeyboardAvoiding_updateContentInset()
        //        }
    }


    override init(frame: CGRect, style: UITableViewStyle) {
        super.init(frame: frame, style: style)
        self.setup()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.setup()
    }

    override func awakeFromNib() {
        setup()
    }

    deinit{
        NotificationCenter.default.removeObserver(self)
    }

    func hasAutomaticKeyboardAvoidingBehaviour()->Bool
    {
        if #available(iOS 8.3, *) {
            if self.delegate is UITableViewController
            {
                return true
            }
        }

        return false
    }

    func focusNextTextField()->Bool
    {
        return self.TPKeyboardAvoiding_focusNextTextField()
    }

    @objc func scrollToActiveTextField()
    {
        return self.TPKeyboardAvoiding_scrollToActiveTextField()
    }

    override func willMove(toSuperview newSuperview: UIView?) {
        super.willMove(toSuperview: newSuperview)
        if newSuperview != nil {
            NSObject.cancelPreviousPerformRequests(withTarget: self, selector: #selector(TPKeyboardAvoiding_assignTextDelegateForViewsBeneathView(_:)), object: self)
        }
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.TPKeyboardAvoiding_findFirstResponderBeneathView(self)?.resignFirstResponder()
        super.touchesEnded(touches, with: event)
    }

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        if !self.focusNextTextField()
        {
            textField.resignFirstResponder()
        }
        return true
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        NSObject.cancelPreviousPerformRequests(withTarget: self, selector: #selector(TPKeyboardAvoiding_assignTextDelegateForViewsBeneathView(_:)), object: self)

        Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(TPKeyboardAvoiding_assignTextDelegateForViewsBeneathView(_:)), userInfo: nil, repeats: false)
    }
}

private extension TPKeyboardAvoidingTableView
{
    func setup()
    {
        if self.hasAutomaticKeyboardAvoidingBehaviour() { return }

        NotificationCenter.default.addObserver(self,
                                               selector: #selector(TPKeyboardAvoiding_keyboardWillShow(_:)),
                                               name: NSNotification.Name.UIKeyboardWillChangeFrame,
                                               object: nil)

        NotificationCenter.default.addObserver(self,
                                               selector: #selector(TPKeyboardAvoiding_keyboardWillHide(_:)),
                                               name: NSNotification.Name.UIKeyboardWillHide,
                                               object: nil)

        NotificationCenter.default.addObserver(self,
                                               selector: #selector(scrollToActiveTextField),
                                               name: NSNotification.Name.UITextViewTextDidBeginEditing,
                                               object: nil)

        NotificationCenter.default.addObserver(self,
                                               selector: #selector(scrollToActiveTextField),
                                               name: NSNotification.Name.UITextFieldTextDidBeginEditing,
                                               object: nil)
    }
}

// MARK: - CollectionView
class TPKeyboardAvoidingCollectionView:UICollectionView,UITextViewDelegate {

    override var contentSize:CGSize{
        willSet(newValue){
            if newValue.equalTo(self.contentSize)
            {
                return
            }

            super.contentSize = newValue
            self.TPKeyboardAvoiding_updateContentInset()
        }

        //        didSet{
        //            self.TPKeyboardAvoiding_updateContentInset()
        //        }
    }


    override var frame:CGRect{
        willSet{
            super.frame = frame
        }

        didSet{
            self.TPKeyboardAvoiding_updateContentInset()
        }
    }

    //    override init(frame: CGRect) {
    //        super.init(frame: frame)
    //    }

    override init(frame: CGRect, collectionViewLayout layout: UICollectionViewLayout) {
        super.init(frame: frame, collectionViewLayout: layout)
        setup()
    }

    required init?(coder aDecoder: NSCoder) {
        //        fatalError("init(coder:) has not been implemented")
        super.init(coder: aDecoder)
        self.setup()

    }

    override func awakeFromNib() {
        setup()
    }

    deinit{
        NotificationCenter.default.removeObserver(self)
    }

    func focusNextTextField()->Bool
    {
        return self.TPKeyboardAvoiding_focusNextTextField()
    }

    @objc func scrollToActiveTextField()
    {
        return self.TPKeyboardAvoiding_scrollToActiveTextField()
    }

    override func willMove(toSuperview newSuperview: UIView?) {
        super.willMove(toSuperview: newSuperview)
        if newSuperview != nil {
            NSObject.cancelPreviousPerformRequests(withTarget: self, selector: #selector(TPKeyboardAvoiding_assignTextDelegateForViewsBeneathView(_:)), object: self)
        }
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.TPKeyboardAvoiding_findFirstResponderBeneathView(self)?.resignFirstResponder()
        super.touchesEnded(touches, with: event)
    }

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        if !self.focusNextTextField()
        {
            textField.resignFirstResponder()
        }
        return true
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        NSObject.cancelPreviousPerformRequests(withTarget: self, selector: #selector(TPKeyboardAvoiding_assignTextDelegateForViewsBeneathView(_:)), object: self)

        Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(TPKeyboardAvoiding_assignTextDelegateForViewsBeneathView(_:)), userInfo: nil, repeats: false)
    }
}

private extension TPKeyboardAvoidingCollectionView
{
    func setup()
    {
        NotificationCenter.default.addObserver(self,
                                               selector: #selector(TPKeyboardAvoiding_keyboardWillShow(_:)),
                                               name: NSNotification.Name.UIKeyboardWillChangeFrame,
                                               object: nil)

        NotificationCenter.default.addObserver(self,
                                               selector: #selector(TPKeyboardAvoiding_keyboardWillHide(_:)),
                                               name: NSNotification.Name.UIKeyboardWillHide,
                                               object: nil)

        NotificationCenter.default.addObserver(self,
                                               selector: #selector(scrollToActiveTextField),
                                               name: NSNotification.Name.UITextViewTextDidBeginEditing,
                                               object: nil)

        NotificationCenter.default.addObserver(self,
                                               selector: #selector(scrollToActiveTextField),
                                               name: NSNotification.Name.UITextFieldTextDidBeginEditing,
                                               object: nil)
    }
}

// MARK: - ScrollView
class TPKeyboardAvoidingScrollView:UIScrollView,UITextFieldDelegate,UITextViewDelegate
{
    override var contentSize:CGSize{
        didSet{
            self.TPKeyboardAvoiding_updateFromContentSizeChange()
        }
    }


    override var frame:CGRect{
        didSet{
            self.TPKeyboardAvoiding_updateContentInset()
        }
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        self.setup()
    }

    override func awakeFromNib() {
        setup()
    }

    func contentSizeToFit()
    {
        self.contentSize = self.TPKeyboardAvoiding_calculatedContentSizeFromSubviewFrames()
    }

    func focusNextTextField() ->Bool
    {
        return self.TPKeyboardAvoiding_focusNextTextField()
    }

    @objc func scrollToActiveTextField()
    {
        return self.TPKeyboardAvoiding_scrollToActiveTextField()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.setup()
    }

    deinit{
        NotificationCenter.default.removeObserver(self)
    }

    override func willMove(toSuperview newSuperview: UIView?) {
        super.willMove(toSuperview: newSuperview)
        if newSuperview != nil {
            NSObject.cancelPreviousPerformRequests(withTarget: self, selector: #selector(TPKeyboardAvoiding_assignTextDelegateForViewsBeneathView(_:)), object: self)
        }
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.TPKeyboardAvoiding_findFirstResponderBeneathView(self)?.resignFirstResponder()
        super.touchesEnded(touches, with: event)
    }

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        if !self.focusNextTextField()
        {
            textField.resignFirstResponder()
        }
        return true
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        NSObject.cancelPreviousPerformRequests(withTarget: self, selector: #selector(TPKeyboardAvoiding_assignTextDelegateForViewsBeneathView(_:)), object: self)

        Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(TPKeyboardAvoiding_assignTextDelegateForViewsBeneathView(_:)), userInfo: nil, repeats: false)
    }
}

private extension TPKeyboardAvoidingScrollView
{
    func setup()
    {
        NotificationCenter.default.addObserver(self,
                                               selector: #selector(TPKeyboardAvoiding_keyboardWillShow(_:)),
                                               name: NSNotification.Name.UIKeyboardWillChangeFrame,
                                               object: nil)

        NotificationCenter.default.addObserver(self,
                                               selector: #selector(TPKeyboardAvoiding_keyboardWillHide(_:)),
                                               name: NSNotification.Name.UIKeyboardWillHide,
                                               object: nil)

        NotificationCenter.default.addObserver(self,
                                               selector: #selector(scrollToActiveTextField),
                                               name: NSNotification.Name.UITextViewTextDidBeginEditing,
                                               object: nil)

        NotificationCenter.default.addObserver(self,
                                               selector: #selector(scrollToActiveTextField),
                                               name: NSNotification.Name.UITextFieldTextDidBeginEditing,
                                               object: nil)
    }
}

// MARK: - Process Event
let kCalculatedContentPadding:CGFloat = 10;
let kMinimumScrollOffsetPadding:CGFloat = 20;

extension UIScrollView
{
    @objc func TPKeyboardAvoiding_keyboardWillShow(_ notification:Notification)
    {
        guard let userInfo = notification.userInfo else { return }
        guard let rectNotification = notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue else
        {
            return
        }

        let keyboardRect = self.convert(rectNotification.cgRectValue , from: nil)
        if keyboardRect.isEmpty
        {
            return
        }

        let state = self.keyboardAvoidingState()

        guard let firstResponder = self.TPKeyboardAvoiding_findFirstResponderBeneathView(self) else { return}
        state.keyboardRect = keyboardRect
        if !state.keyboardVisible
        {
            state.priorInset = self.contentInset
            state.priorScrollIndicatorInsets = self.scrollIndicatorInsets
            state.priorPagingEnabled = self.isPagingEnabled
        }

        state.keyboardVisible = true
        self.isPagingEnabled = false

        if self is TPKeyboardAvoidingScrollView
        {
            state.priorContentSize = self.contentSize
            if self.contentSize.equalTo(CGSize.zero)
            {
                self.contentSize = self.TPKeyboardAvoiding_calculatedContentSizeFromSubviewFrames()
            }
        }

        let duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as? Float ?? 0.0
        let curve = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? Int ?? 0
        let options = UIViewAnimationOptions(rawValue: UInt(curve))

        UIView.animate(withDuration: TimeInterval(duration),
                       delay: 0,
                       options: options,
                       animations: { [weak self]() -> Void in
                        if let actualSelf = self
                        {
                            actualSelf.contentInset = actualSelf.TPKeyboardAvoiding_contentInsetForKeyboard()
                            let viewableHeight = actualSelf.bounds.size.height - actualSelf.contentInset.top - actualSelf.contentInset.bottom
                            let point = CGPoint(x: actualSelf.contentOffset.x, y: actualSelf.TPKeyboardAvoiding_idealOffsetForView(firstResponder, viewAreaHeight: viewableHeight))
                            actualSelf.setContentOffset(point, animated: false)

                            actualSelf.scrollIndicatorInsets = actualSelf.contentInset
                            actualSelf.layoutIfNeeded()
                        }

        }) { (finished) -> Void in

        }
    }

    @objc func TPKeyboardAvoiding_keyboardWillHide(_ notification:Notification)
    {
        guard let userInfo = notification.userInfo else { return }

        guard let rectNotification = userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue else
        {
            return
        }
        let keyboardRect = self.convert(rectNotification.cgRectValue , from: nil)
        if keyboardRect.isEmpty
        {
            return
        }
        let state = self.keyboardAvoidingState()

        if !state.keyboardVisible
        {
            return
        }
        state.keyboardRect = CGRect.zero
        state.keyboardVisible = false

        let duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as? Float ?? 0.0
        let curve = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? Int ?? 0
        let options = UIViewAnimationOptions(rawValue: UInt(curve))

        UIView.animate(withDuration: TimeInterval(duration),
                       delay: 0,
                       options: options,
                       animations: { [weak self]() -> Void in
                        if let actualSelf = self
                        {
                            if actualSelf is TPKeyboardAvoidingScrollView {
                                actualSelf.contentSize = state.priorContentSize
                                actualSelf.contentInset = state.priorInset
                                actualSelf.scrollIndicatorInsets = state.priorScrollIndicatorInsets
                                actualSelf.isPagingEnabled = state.priorPagingEnabled
                                actualSelf.layoutIfNeeded()
                            }
                        }

        }) { (finished) -> Void in

        }
    }

    func TPKeyboardAvoiding_updateFromContentSizeChange()
    {
        let state = self.keyboardAvoidingState()
        if state.keyboardVisible
        {
            state.priorContentSize = self.contentSize
        }
    }

    func TPKeyboardAvoiding_focusNextTextField() ->Bool
    {
        guard let firstResponder = self.TPKeyboardAvoiding_findFirstResponderBeneathView(self) else { return false}
        guard let view = self.TPKeyboardAvoiding_findNextInputViewAfterView(firstResponder, beneathView: self) else { return false}
        Timer.scheduledTimer(timeInterval: 0.1, target: view, selector: #selector(becomeFirstResponder), userInfo: nil, repeats: false)

        return true

    }

    func TPKeyboardAvoiding_scrollToActiveTextField()
    {
        let state = self.keyboardAvoidingState()

        if !state.keyboardVisible { return }

        let visibleSpace = self.bounds.size.height - self.contentInset.top - self.contentInset.bottom

        let idealOffset = CGPoint(x: 0,
                                  y: self.TPKeyboardAvoiding_idealOffsetForView(self.TPKeyboardAvoiding_findFirstResponderBeneathView(self),
                                                                                viewAreaHeight: visibleSpace))

        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + Double((Int64)(0 * NSEC_PER_SEC)) / Double(NSEC_PER_SEC)) {[weak self] () -> Void in
            self?.setContentOffset(idealOffset, animated: true)
        }
    }

    //Helper
    func TPKeyboardAvoiding_findFirstResponderBeneathView(_ view:UIView) -> UIView?
    {
        for childView in view.subviews
        {
            if childView.responds(to: #selector(getter: isFirstResponder)) && childView.isFirstResponder
            {
                return childView
            }
            let result = TPKeyboardAvoiding_findFirstResponderBeneathView(childView)
            if result != nil
            {
                return result
            }
        }
        return nil
    }

    func TPKeyboardAvoiding_updateContentInset()
    {
        let state = self.keyboardAvoidingState()
        if state.keyboardVisible
        {
            self.contentInset = self.TPKeyboardAvoiding_contentInsetForKeyboard()
        }
    }

    func TPKeyboardAvoiding_calculatedContentSizeFromSubviewFrames() ->CGSize
    {
        let wasShowingVerticalScrollIndicator = self.showsVerticalScrollIndicator
        let wasShowingHorizontalScrollIndicator = self.showsHorizontalScrollIndicator

        self.showsVerticalScrollIndicator = false
        self.showsHorizontalScrollIndicator = false

        var rect = CGRect.zero

        for view in self.subviews
        {
            rect = rect.union(view.frame)
        }

        rect.size.height += kCalculatedContentPadding
        self.showsVerticalScrollIndicator = wasShowingVerticalScrollIndicator
        self.showsHorizontalScrollIndicator = wasShowingHorizontalScrollIndicator

        return rect.size
    }

    func TPKeyboardAvoiding_idealOffsetForView(_ view:UIView?,viewAreaHeight:CGFloat) -> CGFloat
    {
        let contentSize = self.contentSize

        var offset:CGFloat = 0.0
        let subviewRect =  view != nil ? view!.convert(view!.bounds, to: self) : CGRect.zero

        var padding = (viewAreaHeight - subviewRect.height)/2
        if padding < kMinimumScrollOffsetPadding
        {
            padding = kMinimumScrollOffsetPadding
        }

        offset = subviewRect.origin.y - padding - self.contentInset.top

        if offset > (contentSize.height - viewAreaHeight)
        {
            offset = contentSize.height - viewAreaHeight
        }

        if offset < -self.contentInset.top
        {
            offset = -self.contentInset.top
        }

        return offset
    }

    func TPKeyboardAvoiding_contentInsetForKeyboard() -> UIEdgeInsets
    {
        let state = self.keyboardAvoidingState()
        var newInset = self.contentInset;

        let keyboardRect = state.keyboardRect
        newInset.bottom = keyboardRect.size.height - max(keyboardRect.maxY - self.bounds.maxY, 0)

        return newInset

    }

    func TPKeyboardAvoiding_viewIsValidKeyViewCandidate(_ view:UIView)->Bool
    {
        if view.isHidden || !view.isUserInteractionEnabled {return false}

        if view is UITextField
        {
            if (view as! UITextField).isEnabled {return true}
        }

        if view is UITextView
        {
            if (view as! UITextView).isEditable {return true}
        }

        return false
    }

    func TPKeyboardAvoiding_findNextInputViewAfterView(_ priorView:UIView,beneathView view:UIView, candidateView bestCandidate: inout UIView?)
    {
        let priorFrame = self.convert(priorView.frame, to: priorView.superview)
        let candidateFrame = bestCandidate == nil ? CGRect.zero : self.convert(bestCandidate!.frame, to: bestCandidate!.superview)

        var bestCandidateHeuristic = -sqrt(candidateFrame.origin.x*candidateFrame.origin.x + candidateFrame.origin.y*candidateFrame.origin.y) + ( Float(fabs(candidateFrame.minY - priorFrame.minY))<Float.ulpOfOne ? 1e6 : 0)

        for childView in view.subviews
        {
            if TPKeyboardAvoiding_viewIsValidKeyViewCandidate(childView)
            {
                let frame = self.convert(childView.frame, to: view)
                let heuristic = -sqrt(frame.origin.x*frame.origin.x + frame.origin.y*frame.origin.y)
                    + (Float(fabs(frame.minY - priorFrame.minY)) < Float.ulpOfOne ? 1e6 : 0)

                if childView != priorView && (Float(fabs(frame.minY - priorFrame.minY)) < Float.ulpOfOne
                    && frame.minX > priorFrame.minX
                    || frame.minY > priorFrame.minY)
                    && (bestCandidate == nil || heuristic > bestCandidateHeuristic)
                {
                    bestCandidate = childView
                    bestCandidateHeuristic = heuristic
                }
            }else
            {
                self.TPKeyboardAvoiding_findNextInputViewAfterView(priorView, beneathView: view, candidateView: &bestCandidate)
            }
        }
    }

    func TPKeyboardAvoiding_findNextInputViewAfterView(_ priorView:UIView,beneathView view:UIView) ->UIView?
    {
        var candidate:UIView?
        self.TPKeyboardAvoiding_findNextInputViewAfterView(priorView, beneathView: view, candidateView: &candidate)
        return candidate
    }


    @objc func TPKeyboardAvoiding_assignTextDelegateForViewsBeneathView(_ obj: AnyObject)
    {
        func processWithView(_ view: UIView) {
            for childView in view.subviews
            {
                if childView is UITextField || childView is UITextView
                {
                    self.TPKeyboardAvoiding_initializeView(childView)
                }else
                {
                    self.TPKeyboardAvoiding_assignTextDelegateForViewsBeneathView(childView)
                }
            }
        }

        if let timer = obj as? Timer, let view = timer.userInfo as? UIView {
            processWithView(view)
        }
        else if let view = obj as? UIView {
            processWithView(view)
        }
    }

    func TPKeyboardAvoiding_initializeView(_ view:UIView)
    {
        if let textField = view as? UITextField,
            let delegate = self as? UITextFieldDelegate, textField.returnKeyType == UIReturnKeyType.default &&
            textField.delegate !== delegate
        {
            textField.delegate = delegate
            let otherView = self.TPKeyboardAvoiding_findNextInputViewAfterView(view, beneathView: self)
            textField.returnKeyType = otherView != nil ? .next : .done

        }
    }

    func keyboardAvoidingState()->TPKeyboardAvoidingState
    {
        var state = objc_getAssociatedObject(self, &AssociatedKeysKeyboard.DescriptiveName) as? TPKeyboardAvoidingState
        if state == nil
        {
            state = TPKeyboardAvoidingState()
            self.state = state
        }

        return self.state!
    }

}

// MARK: - Internal object observer
internal class TPKeyboardAvoidingState:NSObject
{
    var priorInset = UIEdgeInsets.zero
    var priorScrollIndicatorInsets = UIEdgeInsets.zero

    var keyboardVisible = false
    var keyboardRect = CGRect.zero
    var priorContentSize = CGSize.zero

    var priorPagingEnabled = false
}

internal extension UIScrollView
{
    fileprivate struct AssociatedKeysKeyboard {
        static var DescriptiveName = "KeyBoard_DescriptiveName"
    }

    var state:TPKeyboardAvoidingState?{
        get{
            let optionalObject:AnyObject? = objc_getAssociatedObject(self, &AssociatedKeysKeyboard.DescriptiveName) as AnyObject?
            if let object:AnyObject = optionalObject {
                return object as? TPKeyboardAvoidingState
            } else {
                return nil
            }
        }
        set{
            objc_setAssociatedObject(self, &AssociatedKeysKeyboard.DescriptiveName, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
    }
}

我喜欢简洁的Swift代码。这是我能想出的最严格的代码，可以用键盘上下移动文本视图。它目前正在iOS8/9 Swift 2生产应用程序中运行。

更新(2016年3月): 我只是尽可能地压缩了之前的代码。此外，这里还有一些流行的答案，它们硬编码了键盘高度和动画参数。这是没有必要的，更不用说这些答案中的数字并不总是与我在6s+ iOS9上看到的实际值一致(键盘高度226，持续时间0.25，动画曲线7)。在任何情况下，几乎不需要额外的代码来直接从系统获取这些值。见下文。

override func viewDidLoad() {
    super.viewDidLoad()

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "animateWithKeyboard:", name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "animateWithKeyboard:", name: UIKeyboardWillHideNotification, object: nil)
}

func animateWithKeyboard(notification: NSNotification) {

    // Based on both Apple's docs and personal experience, 
    // I assume userInfo and its documented keys are available.
    // If you'd like, you can remove the forced unwrapping and add your own default values.

    let userInfo = notification.userInfo!
    let keyboardHeight = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue().height
    let duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as! Double
    let curve = userInfo[UIKeyboardAnimationCurveUserInfoKey] as! UInt
    let moveUp = (notification.name == UIKeyboardWillShowNotification)

    // baseContraint is your Auto Layout constraint that pins the
    // text view to the bottom of the superview.

    baseConstraint.constant = moveUp ? -keyboardHeight : 0

    let options = UIViewAnimationOptions(rawValue: curve << 16)
    UIView.animateWithDuration(duration, delay: 0, options: options,
        animations: {
            self.view.layoutIfNeeded()
        },
        completion: nil
    )

}

注意:这段代码涵盖了大多数注释/一般情况。然而，处理不同的方向和/或自定义键盘可能需要更多的代码。如果你需要处理每一个场景，这可能会有所帮助。