在常規UIViewController上的UITableViewCell中的上方滾動UITextField

Question

我已經嘗試了大部分StackOverflow上的示例。我也用蘋果的。我似乎對他們的問題是，他們沒有考慮UITextField在UITableView中。我已經做了很多次，但沒有這樣做。我有一個自定義的UITableViewCell和UITextField。

在我的UITableView（不是UITableViewController）上，我需要能夠避免隱藏UITableView下的UITextField。

我有這個截至目前：

-(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]; 
} 

這似乎推了一堆空白了過去我的鍵盤。另請注意，我的UITextField上也有一個inputAccessoryView。

哦，我不能使用任何第三方類。我喜歡TPKeyboardAvoidingScrollView，但我不能使用任何第三方。

Answer 1

我花了整整一天的時間來解決這個問題。我在這裏發佈了它，然後找到了一個博客鏈接和一個非常簡單的解決方案。它看起來像這樣：

-(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

我試過@inturbidus張貼iOS8上的鏈接，但遺憾的是它並沒有爲我工作。經過一番挖掘之後，事實證明，蘋果公司在他們的網站上確實有示例代碼，以便像在UITableViewController中那樣自然地工作。這是Objective-C版本的Apple鏈接，我也在這裏添加了快速版本。從蘋果

Objective-C的鏈接（滾動到列表5-1）：Objective-C的版本

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

感謝@Salman爲鏈接的https://developer.apple.com/library/ios/documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/KeyboardManagement/KeyboardManagement.html

斯威夫特適應。
只需注意Apple視圖在正常視圖中用於滾動視圖。
在表中查看你必須點和activeField的矩形轉換爲表的座標，所以我改變功能keyboardWasShown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) 
     } 
} 

而如果你的觀點有tabBarController，記住將與的TabBar高度contentInsets代替UIEdgeInsetsZero （如果沒有，你最後的底部行可能的TabBar下隱伏）：

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

滾動的UITextField鍵盤上方的一個UITableViewCell定期迅速的UIViewController 3和Xcode的8.1 ​​

1）設置代表= 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 5

我製成的混合物與馬特的答案，並也塞勒曼。 這適用於tableView中的許多文本字段。Swift 3

基本上是得到了BOTTOM Y點的文字輸入感動。一旦我們有，我檢查如果鍵盤覆蓋textInput，如果做到這一點，我會改變tableView的contentOffset

首先註冊通知。在init如果是一個UIView或viewDidLoad中如果是一個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) 

然後設置文本字段觸摸作爲電流輸入

var inputActive: UITextField! 

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

最後執行的通知方法：

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 
} 

幾件事情要添加。 填充是一些額外的距離，我在我的情況下添加了20分。 另外在我的情況下，UITableView被添加到UIViewController，但是這也應該在UITableViewController中工作

希望這有助於！

Answer 6

這個答案是Xamarin iOS用戶，但有人可以很容易地修改它，使其與雨燕或目的C.

的解決方案是非常簡單的，並已在我的情況，我需要一個細胞的工作完美工作出現在屏幕的上半部分，以便單元格的文本字段位於鍵盤上方。因此，我所做的是以下幾點：

我實現textField.ShouldBeginEditing方式如下：

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

    return true; 
}; 

其中：

myTextField將是小區的文本字段，

myTableView是表格視圖，

indexPath是表格視圖內單元的索引路徑。

正如我前面提到的，這個解決方案在我的情況下是完美的，所以我想我可以與你們分享它，以防它對你有用。快樂編碼:)

Answer 7

我的解決方案（上的Xcode 8.3.3，斯威夫特3工作，iOS版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 
    } 

}