在常规UIViewController上的UITableViewCell中将UITextField滚动到键盘上方

Question

我在StackOverflow上尝试了大部分示例。我也用过Apple。我似乎与他们有的问题是他们没有考虑UITextField在UITableView中。我已经做了很多次，但不是这样。我有一个带有UITextField的自定义UITableViewCell。

在我的UITableView（不是UITableViewController）上，我需要能够避免在UITableView下隐藏UITextField。

我现在有这个：

-(void)viewDidLoad
{
....
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification
                                               object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];

....
}

- (void)scrollToRectOfTextField {
    UITableViewCell *cell = (UITableViewCell*)[self.activeTextField superview];
    CGRect r = CGRectMake(self.activeTextField.frame.origin.x,
                          cell.frame.origin.y+self.activeTextField.frame.origin.y,
                          self.activeTextField.frame.size.width,
                          self.activeTextField.frame.size.height);
    [self.tableView scrollRectToVisible:r animated:YES];
}

- (void)keyboardDidShow:(NSNotification *)notification
{
    if (UI_USER_INTERFACE_IDIOM()== UIUserInterfaceIdiomPhone) {
        NSDictionary *userInfo = [notification userInfo];
        CGSize size = [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
        NSLog(@"TableView: %@", NSStringFromCGRect(self.tableView.frame));
        CGRect newTableViewFrame = CGRectMake(self.tableView.frame.origin.x,
                                              self.tableView.frame.origin.y,
                                              self.tableView.frame.size.width, self.tableView.frame.size.height - size.height);
        self.tableView.frame = newTableViewFrame;
        NSLog(@"New TableView: %@", NSStringFromCGRect(self.tableView.frame));


        self.tableView.contentSize = CGSizeMake(self.tableView.contentSize.width, self.tableView.contentSize.height-size.height);
    }
}


- (void)keyboardWillHide:(NSNotification *)notification
{
    NSDictionary *userInfo = [notification userInfo];
    CGSize size = [[userInfo objectForKey: UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
    self.tableView.frame = CGRectMake(self.tableView.frame.origin.x,
                                      self.tableView.frame.origin.y,
                                      self.tableView.frame.size.width,
                                      self.tableView.frame.size.height + size.height);

    NSLog(@"%@", NSStringFromCGRect(self.tableView.frame));
}


-(void)textFieldDidBeginEditing
{
     [self scrollToRectOfTextField];
}

这似乎把一堆空白区域推到我的键盘上方。另请注意，我的UITextField上也有一个inputAccessoryView。

哦，我不能使用任何第三方课程。我喜欢TPKeyboardAvoidingScrollView，但我不能使用任何第三方。

Answer 1

我花了一整天时间试图解决这个问题。我在这里发布了它，然后找到了一个博客链接和一个非常简单的解决方案。它看起来像这样：

-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    CGPoint pointInTable = [textField.superview convertPoint:textField.frame.origin toView:self.tableView];
    CGPoint contentOffset = self.tableView.contentOffset;

    contentOffset.y = (pointInTable.y - textField.inputAccessoryView.frame.size.height);

    NSLog(@"contentOffset is: %@", NSStringFromCGPoint(contentOffset));

    [self.tableView setContentOffset:contentOffset animated:YES];

    return YES;
}


-(BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
    [textField resignFirstResponder];

    if ([textField.superview.superview isKindOfClass:[UITableViewCell class]])
    {
        UITableViewCell *cell = (UITableViewCell*)textField.superview.superview;
        NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];

        [self.tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionMiddle animated:TRUE];
    }

    return YES;
}

Check this for iOS 8

Answer 2

我尝试了@inturbidus为iOS8发布的链接，但遗憾的是它对我不起作用。经过一番挖掘后，事实证明Apple确实在他们的网站上有示例代码，以便像在UITableViewController中那样自然地完成这项工作。这是Objective-C版本的Apple链接，我也在这里添加了swift版本。

来自Apple的

Objective-C链接（滚动到清单5-1）： https://developer.apple.com/library/ios/documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/KeyboardManagement/KeyboardManagement.html

快速调整Objective-C版本

var activeField: UITextField?

func textFieldDidBeginEditing(textField: UITextField) {
    self.activeField = textField
}

func textFieldDidEndEditing(textField: UITextField) {
    self.activeField = nil
}

func registerForKeyboardNotifications() {
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWasShown:", name: UIKeyboardDidShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillBeHidden:", name: UIKeyboardWillHideNotification, object: nil)
}    

func keyboardWasShown(aNotification: NSNotification) {
    let info = aNotification.userInfo as! [String: AnyObject],
    kbSize = (info[UIKeyboardFrameBeginUserInfoKey] as! NSValue).CGRectValue().size,
    contentInsets = UIEdgeInsets(top: 0, left: 0, bottom: kbSize.height, right: 0)

    self.tableView.contentInset = contentInsets
    self.tableView.scrollIndicatorInsets = contentInsets

    // If active text field is hidden by keyboard, scroll it so it's visible
    // Your app might not need or want this behavior.
    var aRect = self.view.frame
    aRect.size.height -= kbSize.height

    if !CGRectContainsPoint(aRect, activeField!.frame.origin) {
        self.tableView.scrollRectToVisible(activeField!.frame, animated: true)
    }
}

func keyboardWillBeHidden(aNotification: NSNotification) {
    let contentInsets = UIEdgeInsetsZero
    self.tableView.contentInset = contentInsets
    self.tableView.scrollIndicatorInsets = contentInsets
}

Answer 3

感谢@Salman的链接。
请注意，Apple示例在普通视图中用于scrollview 在表视图中，您必须将activeField的Point和Rect转换为表的坐标，因此我更改了函数keyboardWasShown中的一些行：

func keyboardWasShown(aNotification: NSNotification) {
        let info = aNotification.userInfo as! [String: AnyObject],
        kbSize = (info[UIKeyboardFrameBeginUserInfoKey] as! NSValue).CGRectValue().size,
        contentInsets = UIEdgeInsets(top: 0, left: 0, bottom: kbSize.height, right: 0)

        self.tableBasket.contentInset = contentInsets
        self.tableBasket.scrollIndicatorInsets = contentInsets

        var aRect = self.view.frame
        aRect.size.height -= kbSize.height

        let pointInTable = activeField!.superview!.convertPoint(activeField!.frame.origin, toView: tableView)
        let rectInTable = activeField!.superview!.convertRect(activeField!.frame, toView: tableView)

        if !CGRectContainsPoint(aRect, pointInTable) {
            self.tableView.scrollRectToVisible(rectInTable, animated: true)
        }
}

如果您的视图有tabBarController，请记住使用tabBar高度而不是UIEdgeInsetsZero重置contentInsets（如果没有，您的最后一行可能会隐藏在tabBar下）：

func keyboardWillBeHidden(aNotification: NSNotification) {
        //UIEdgeInsetsZero is used in view without tabBar
        //let contentInsets = UIEdgeInsetsZero
        let tabBarHeight = self.tabBarController!.tabBar.frame.height
        let contentInsets = UIEdgeInsets(top: 0, left: 0, bottom: tabBarHeight, right: 0)
        self.tableView.contentInset = contentInsets
        self.tableView.scrollIndicatorInsets = contentInsets
    }
}

Answer 4

我将 Matt 以及 Salman 的答案混合在一起。 这适用于tableView中的许多文本字段。 Swift 3

基本上是触及textInput的 BOTTOM Y 点。一旦我们有了，我检查键盘是否覆盖textInput，如果这样做，我会改变tableView的contentOffset

首先注册通知。在init中，如果是UIView，或者在viewDidLoad中，如果是UIViewController：

    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)

然后将触摸的文本字段设置为当前输入

var inputActive: UITextField!

func textViewShouldBeginEditing(_ textView: UITextView) -> Bool {
    inputActive = textInput
    return true
}

最后实现通知方法：

func keyboardWillShow(notification: NSNotification) {
    var userInfo = notification.userInfo!
    if let keyboardFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
        // Get my height size
        let myheight = tableView.frame.height
        // Get the top Y point where the keyboard will finish on the view
        let keyboardEndPoint = myheight - keyboardFrame.height
        // Get the the bottom Y point of the textInput and transform it to the currentView coordinates.
        if let pointInTable = inputActive.superview?.convert(inputActive.frame.origin, to: tableView) {
            let textFieldBottomPoint = pointInTable.y + inputActive.frame.size.height + 20
            // Finally check if the keyboard will cover the textInput
            if keyboardEndPoint <= textFieldBottomPoint {
                tableView.contentOffset.y = textFieldBottomPoint - keyboardEndPoint
            } else {
                tableView.contentOffset.y = 0
            }
        }
    }
}

func keyboardWillHide(notification: NSNotification) {
    tableView.contentOffset.y = 0
}

很少要添加的东西。 填充是我在案例中添加的额外距离是20分。 同样在我的情况下，UITableView被添加到UIViewController但这也应该在UITableViewController中工作

希望这有帮助！

Answer 5

我的解决方案（适用于Xcode 8.3.3，Swift 3，iOS 10.3.1）：

class MyTableViewController: UITableViewController {

    override func viewWillAppear(_ animated: Bool) {
        NotificationCenter.default.addObserver(self, selector: #selector(actionKeyboardDidShow(with:)), name: .UIKeyboardDidShow, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(actionKeyboardWillHide(with:)), name: .UIKeyboardWillHide, object: nil)
    }

    override func viewDidDisappear(_ animated: Bool) {
        NotificationCenter.default.removeObserver(self, name: .UIKeyboardDidShow, object: nil)
        NotificationCenter.default.removeObserver(self, name: .UIKeyboardWillHide, object: nil)
    }

    @objc private func actionKeyboardDidShow(with notification: Notification) {
        guard let userInfo = notification.userInfo as? [String: AnyObject],
            let keyboardFrame = (userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue
            else { return }

        var contentInset = self.tableView.contentInset
        contentInset.bottom += keyboardFrame.height

        self.tableView.contentInset = contentInset
        self.tableView.scrollIndicatorInsets = contentInset
    }

    @objc private func actionKeyboardWillHide(with notification: Notification) {
        guard let userInfo = notification.userInfo as? [String: AnyObject],
            let keyboardFrame = (userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue
            else { return }

        var contentInset = self.tableView.contentInset
        contentInset.bottom -= keyboardFrame.height

        self.tableView.contentInset = contentInset
        self.tableView.scrollIndicatorInsets = contentInset
    }

}

Answer 6

在常规UIViewController swift 3和Xcode 8.1上的UITableViewCell中将UITextField滚动到键盘上方

1）设置Delegate = UITextFieldDelegate

  override func viewWillAppear(_ animated: Bool) {

        NotificationCenter.default.addObserver(self, selector: #selector(DayViewController.keyboardWillShow), name:NSNotification.Name.UIKeyboardWillShow, object: nil);
        NotificationCenter.default.addObserver(self, selector: #selector(DayViewController.keyboardWillHide), name:NSNotification.Name.UIKeyboardWillHide, object: nil);

   }
      func textFieldDidBeginEditing(_ textField: UITextField) {
          self.activeField = textField
   }
      func textFieldDidEndEditing(_ textField: UITextField) {
        self.activeField = nil
   }


//MARK: - Keyboard Show and Hide Methods
    func keyboardWillShow(notification: NSNotification)
    {
        let info = notification.userInfo! as! [String: AnyObject],
        kbSize = (info[UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue.size,
        contentInsets = UIEdgeInsets(top: 0, left: 0, bottom: kbSize.height, right: 0)

        self.FourthTblMainTableView.contentInset = contentInsets
        self.FourthTblMainTableView.scrollIndicatorInsets = contentInsets

        var aRect = self.FourthTblMainTableView.frame
        aRect.size.height -= kbSize.height
    }
    func keyboardWillHide(notification: NSNotification)
    {
         let contentInsets = UIEdgeInsets.zero
        self.FourthTblMainTableView.contentInset = contentInsets
        self.FourthTblMainTableView.scrollIndicatorInsets = contentInsets
    }

Answer 7

这个答案适用于Xamarin iOS用户，但有人可以轻松修改它以使其适用于Swift或Objective C。

解决方案非常简单，在我的情况下完美运行，我需要在屏幕的上半部分显示一个单元格，以便单元格的文本字段位于键盘上方。所以我做的是以下内容：

我用以下方式实现了textField.ShouldBeginEditing：

myTextField.ShouldBeginEditing = textField =>
{
   myTableView.ScrollToRow(indexPath, UITableViewScrollPosition.Top, true);

   return true;
};

其中：

myTextField 是单元格的文本字段，

myTableView 是表格视图，

indexPath 是表格视图中单元格的索引路径。

正如我之前提到的，这个解决方案在我的案例中完美无缺，所以我想我可以与你们分享它，以防万一它也适合你。快乐的编码：）

Answer 8

我在@Victor的答案和我拥有的一些代码之间进行了混合。 我创建了一个方便的扩展，可以在许多UITextField中使用。

1.-首先，我们需要 UITextField扩展名来管理键盘通知

extension UITextField {

    func keepTextFieldAboveKeyboard(tableView:UITableView) {

        var willShowNotification: NSObjectProtocol?
        var willHideNotification: NSObjectProtocol?

        willShowNotification = NotificationCenter.default.addObserver(forName: NSNotification.Name.UIKeyboardWillShow, object: nil, queue: OperationQueue.main) {(notification) in

            var userInfo = notification.userInfo!

            if let keyboardFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
                // Get my height size
                let myheight = tableView.frame.height
                // Get the top Y point where the keyboard will finish on the view
                let keyboardEndPoint = myheight - keyboardFrame.height
                // Get the the bottom Y point of the textInput and transform it to the currentView coordinates.
                if let pointInTable = self.superview?.convert(self.frame.origin, to: tableView) {

                    let textFieldBottomPoint = pointInTable.y + self.frame.size.height + 20

                    // Finally check if the keyboard will cover the textInput
                    if keyboardEndPoint <= textFieldBottomPoint {

                        tableView.contentOffset.y = textFieldBottomPoint - keyboardEndPoint
                    } else {

                        tableView.contentOffset.y = 0
                    }
                }
            }

            NotificationCenter.default.removeObserver(willShowNotification!)
        }

        willHideNotification = NotificationCenter.default.addObserver(forName: NSNotification.Name.UIKeyboardWillHide, object: nil, queue: OperationQueue.main) { (notification) in

            tableView.contentOffset.y = 0

            NotificationCenter.default.removeObserver(willHideNotification!)
        }

    }

}

2.-此先前的扩展名应该在 textFieldShouldBeginEditing 内部调用，这样我们也可以为其添加扩展名

extension UITextField : UITextFieldDelegate {

    public func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool  {

        guard let tableView = textField.parentView(of: UITableView.self) else { return true };

        textField.keepTextFieldAboveKeyboard(tableView:tableView);

        return true;

    }
}

3 .--最后，您在上一种方法中注意到，我们需要TableView ，其中UITextField的单元格位于该位置。因此，我们可以使用此扩展名（这对其他目的也有用）

extension UIView {
    func parentView<T: UIView>(of type: T.Type) -> T? {
        guard let view = self.superview else {
            return nil
        }
        return (view as? T) ?? view.parentView(of: T.self)
    }
}

4.--最后，在UITextField所在的单元格中，我们只需编写此简单的代码行

textField.delegate = textField;

完全可重用且通用。

Answer 9

jqgsninimo的解决方案更新为4.2。适用于iOS 12.0。

Swift 4.2

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardDidShow(with:)), name: UIResponder.keyboardDidShowNotification, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(with:)), name: UIResponder.keyboardWillHideNotification, object: nil)
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardDidShowNotification, object: nil)
    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
}

@objc func keyboardDidShow(with notification: Notification) {
    guard let userInfo = notification.userInfo as? [String: AnyObject],
        let keyboardFrame = (userInfo[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue
        else { return }

    var contentInset = self.tableView.contentInset
    contentInset.bottom += keyboardFrame.height

    tableView.contentInset = contentInset
    tableView.scrollIndicatorInsets = contentInset
}

@objc func keyboardWillHide(with notification: Notification) {
    guard let userInfo = notification.userInfo as? [String: AnyObject],
        let keyboardFrame = (userInfo[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue
        else { return }

    var contentInset = self.tableView.contentInset
    contentInset.bottom -= keyboardFrame.height

    tableView.contentInset = contentInset
    tableView.scrollIndicatorInsets = contentInset
}

Answer 10

将@Matt Hudsons 的答案转换为 Swift 4.2 并通过委托进行改进：

df <- data.frame("Question" = c("Trust", "Trust", "Trust", "Trust", "Trust", "Evaluation", "Evaluation", "Evaluation", "Evaluation"),          
             "Value" = c(1, 2, 3, 2, 3, 2, 3, 1, 1, 3)),
"Label" = c("LabelTrust", "LabelTrust", "LabelTrust", "LabelTrust", "LabelTrust", "LabelEvaluation", "LabelEvaluation", "LabelEvaluation", "LabelEvaluation")

在您的 UITableViewCell 中实现 UITextFieldDelegate 并传递 UITextField，如下所示：

func cell(_ cell: UITableViewCell, willStartEditing view: UIView) {
    if let inputAccessoryViewHeight = view.inputAccessoryView?.frame.size.height {
        var contentOffset = self.tableView.contentOffset
        let pointInTable = view.convert(view.frame.origin, to: self.tableView)
        
        contentOffset.y = pointInTable.y - inputAccessoryViewHeight
        
        self.tableView.setContentOffset(contentOffset, animated: true)
    }
}

func cell(_ cell: UITableViewCell, willEndEditing view: UIView) {
    view.resignFirstResponder()
    
    if let position = self.tableView.indexPath(for: cell) {
        self.tableView.scrollToRow(at: position, at: .middle, animated: true)
    }
}

Answer 11

在 swift4 中，我们可以创建 UIViewController 的扩展名。

extension UIViewController {
    //MARK: Keyboard user interactions
    func handleContainerViewFrameOnKeyboardShowHide(originalContainerFrame: CGRect) {
        NotificationCenter.default.addObserver(forName: NSNotification.Name.UIKeyboardWillShow, object: nil, queue: OperationQueue.main) {(notification) in
            var info = (notification as NSNotification).userInfo!
            let keyboardFrame: CGRect = (info[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
            var tableViewFrame = originalContainerFrame
            tableViewFrame.size.height = originalContainerFrame.size.height - keyboardFrame.size.height
            self.view.frame = tableViewFrame
        }
        NotificationCenter.default.addObserver(forName: NSNotification.Name.UIKeyboardWillHide, object: nil, queue: OperationQueue.main) { (notification) in
            self.view.frame = originalContainerFrame
        }
    }
}