当有键盘时如何在开始编辑时使UITextField向上移动？

使用iOS SDK：

我有一个带有UITextField的UIView ， UITextField一个键盘。我需要它能够：

提起键盘后，允许滚动UIScrollView的内容以查看其他文本字段
自动“跳跃”（通过向上滚动）或缩短

我知道我需要一个UIScrollView 。我尝试将UIView的类更改为UIScrollView但仍然无法向上或向下滚动文本框。

我是否需要UIView和UIScrollView ？一个人会进入另一个人吗？

为了自动滚动到活动文本字段，需要实现什么？

理想情况下，将在Interface Builder中完成尽可能多的组件设置。我只想编写所需的代码。

注意：我正在使用的UIView （或UIScrollView ）由一个标签栏（ UITabBar ）调出，该UITabBar需要正常运行。

编辑：我只是在键盘出现时添加滚动条。即使不需要它，我也觉得它提供了一个更好的界面，因为例如，用户可以滚动和更改文本框。

我可以在键盘上下移动时更改UIScrollView的帧大小的地方工作。我只是在使用：

-(void)textFieldDidBeginEditing:(UITextField *)textField { //Keyboard becomes visiblescrollView.frame = CGRectMake(scrollView.frame.origin.x, scrollView.frame.origin.y,
scrollView.frame.size.width,
scrollView.frame.size.height - 215 + 50);   //resize
}-(void)textFieldDidEndEditing:(UITextField *)textField {//keyboard will hidescrollView.frame = CGRectMake(scrollView.frame.origin.x, scrollView.frame.origin.y, scrollView.frame.size.width,scrollView.frame.size.height + 215 - 50); //resize
}

但是，这不会自动“向上移动”或将下部文本字段居中显示区域的中心，这是我真正想要的。

#1楼

如果您现在的内容不适合iPhone屏幕，则只需要ScrollView 。（如果要添加ScrollView作为组件的超级视图。只是为了在键盘出现时使TextField向上滚动，则不需要这样做。）
为了在不被键盘隐藏的情况下显示textfields ，标准方法是在显示键盘时上下移动具有文本字段的视图。

这是一些示例代码：

#define kOFFSET_FOR_KEYBOARD 80.0-(void)keyboardWillShow {// Animate the current view out of the wayif (self.view.frame.origin.y >= 0){[self setViewMovedUp:YES];}else if (self.view.frame.origin.y < 0){[self setViewMovedUp:NO];}
}-(void)keyboardWillHide {if (self.view.frame.origin.y >= 0){[self setViewMovedUp:YES];}else if (self.view.frame.origin.y < 0){[self setViewMovedUp:NO];}
}-(void)textFieldDidBeginEditing:(UITextField *)sender
{if ([sender isEqual:mailTf]){//move the main view, so that the keyboard does not hide it.if  (self.view.frame.origin.y >= 0){[self setViewMovedUp:YES];}}
}//method to move the view up/down whenever the keyboard is shown/dismissed
-(void)setViewMovedUp:(BOOL)movedUp
{[UIView beginAnimations:nil context:NULL];[UIView setAnimationDuration:0.3]; // if you want to slide up the viewCGRect rect = self.view.frame;if (movedUp){// 1. move the view's origin up so that the text field that will be hidden come above the keyboard // 2. increase the size of the view so that the area behind the keyboard is covered up.rect.origin.y -= kOFFSET_FOR_KEYBOARD;rect.size.height += kOFFSET_FOR_KEYBOARD;}else{// revert back to the normal state.rect.origin.y += kOFFSET_FOR_KEYBOARD;rect.size.height -= kOFFSET_FOR_KEYBOARD;}self.view.frame = rect;[UIView commitAnimations];
}- (void)viewWillAppear:(BOOL)animated
{[super viewWillAppear:animated];// register for keyboard notifications[[NSNotificationCenter defaultCenter] addObserver:selfselector:@selector(keyboardWillShow)name:UIKeyboardWillShowNotificationobject:nil];[[NSNotificationCenter defaultCenter] addObserver:selfselector:@selector(keyboardWillHide)name:UIKeyboardWillHideNotificationobject:nil];
}- (void)viewWillDisappear:(BOOL)animated
{[super viewWillDisappear:animated];// unregister for keyboard notifications while not visible.[[NSNotificationCenter defaultCenter] removeObserver:selfname:UIKeyboardWillShowNotificationobject:nil];[[NSNotificationCenter defaultCenter] removeObserver:selfname:UIKeyboardWillHideNotificationobject:nil];
}

#2楼

要考虑的一件事是您是否想UITextField使用UITextField 。我还没有遇到过任何在UITableViewCells之外实际使用UITextFields经过精心设计的iPhone应用程序。

这将是一些额外的工作，但是我建议您实现所有数据输入视图和表视图。将UITextView添加到UITableViewCells 。

#3楼

根据docs ，从iOS 3.0开始，当对文本字段进行行内编辑时， UITableViewController类会自动调整其表视图的大小并重新放置其表视图。我认为将文本字段放在UITableViewCell里面是不够的，正如某些人指出的那样。

从文档：

表格视图控制器支持表格视图行的内联编辑。例如，如果行在编辑模式下具有嵌入的文本字段，则它将正在编辑的行滚动到显示的虚拟键盘上方。

#4楼

有很多解决方案，但是我花了几个小时才能开始工作。因此，我将这段代码放在这里（只需粘贴到项目中，不需要任何修改）：

@interface RegistrationViewController : UIViewController <UITextFieldDelegate>{UITextField* activeField;UIScrollView *scrollView;
}
@end- (void)viewDidLoad
{[super viewDidLoad];scrollView = [[UIScrollView alloc] initWithFrame:self.view.frame];//scrool view must be under main view - swap itUIView* natView = self.view;[self setView:scrollView];[self.view addSubview:natView];CGSize scrollViewContentSize = self.view.frame.size;[scrollView setContentSize:scrollViewContentSize];[self registerForKeyboardNotifications];
}- (void)viewDidUnload {activeField = nil;scrollView = nil;[self unregisterForKeyboardNotifications];[super viewDidUnload];
}- (void)registerForKeyboardNotifications
{[[NSNotificationCenter defaultCenter] addObserver:selfselector:@selector(keyboardWillShown:)name:UIKeyboardWillShowNotification object:nil];[[NSNotificationCenter defaultCenter] addObserver:selfselector:@selector(keyboardWillBeHidden:)name:UIKeyboardWillHideNotification object:nil];}-(void)unregisterForKeyboardNotifications
{[[NSNotificationCenter defaultCenter] removeObserver:selfname:UIKeyboardWillShowNotificationobject:nil];// unregister for keyboard notifications while not visible.[[NSNotificationCenter defaultCenter] removeObserver:selfname:UIKeyboardWillHideNotificationobject:nil];
}- (void)keyboardWillShown:(NSNotification*)aNotification
{NSDictionary* info = [aNotification userInfo];CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;CGRect frame = self.view.frame;frame.size.height -= kbSize.height;CGPoint fOrigin = activeField.frame.origin;fOrigin.y -= scrollView.contentOffset.y;fOrigin.y += activeField.frame.size.height;if (!CGRectContainsPoint(frame, fOrigin) ) {CGPoint scrollPoint = CGPointMake(0.0, activeField.frame.origin.y + activeField.frame.size.height - frame.size.height);[scrollView setContentOffset:scrollPoint animated:YES];}
}- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{[scrollView setContentOffset:CGPointZero animated:YES];
}- (void)textFieldDidBeginEditing:(UITextField *)textField
{activeField = textField;
}- (void)textFieldDidEndEditing:(UITextField *)textField
{activeField = nil;
}-(BOOL) textFieldShouldReturn:(UITextField *)textField
{[textField resignFirstResponder];return YES;
}

PS：我希望代码能帮助某人迅速取得预期的效果。（Xcode 4.5）

#5楼

仅使用TextFields：

1a）使用Interface Builder ：选择所有TextFields => Edit => Embed In => ScrollView

1b）在称为scrollView的UIScrollView中手动嵌入TextField

2）设置UITextFieldDelegate

3）设置每个textField.delegate = self; （或在Interface Builder建立连接）

4） 复制/粘贴：

- (void)textFieldDidBeginEditing:(UITextField *)textField {CGPoint scrollPoint = CGPointMake(0, textField.frame.origin.y);[scrollView setContentOffset:scrollPoint animated:YES];
}- (void)textFieldDidEndEditing:(UITextField *)textField {[scrollView setContentOffset:CGPointZero animated:YES];
}

#6楼

已经有很多答案，但是上面的解决方案仍然没有一个具有“完美”的无错误，向后兼容和无闪烁动画所需的所有花哨的定位内容。（在同时对帧/边界和contentOffset进行动画处理，不同的界面方向，iPad拆分键盘等时发生错误）
让我分享我的解决方案：
（假设您已设置UIKeyboardWill(Show|Hide)Notification ）

// Called when UIKeyboardWillShowNotification is sent
- (void)keyboardWillShow:(NSNotification*)notification
{// if we have no view or are not visible in any window, we don't careif (!self.isViewLoaded || !self.view.window) {return;}NSDictionary *userInfo = [notification userInfo];CGRect keyboardFrameInWindow;[[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] getValue:&keyboardFrameInWindow];// the keyboard frame is specified in window-level coordinates. this calculates the frame as if it were a subview of our view, making it a sibling of the scroll viewCGRect keyboardFrameInView = [self.view convertRect:keyboardFrameInWindow fromView:nil];CGRect scrollViewKeyboardIntersection = CGRectIntersection(_scrollView.frame, keyboardFrameInView);UIEdgeInsets newContentInsets = UIEdgeInsetsMake(0, 0, scrollViewKeyboardIntersection.size.height, 0);// this is an old animation method, but the only one that retains compaitiblity between parameters (duration, curve) and the values contained in the userInfo-Dictionary.[UIView beginAnimations:nil context:NULL];[UIView setAnimationDuration:[[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue]];[UIView setAnimationCurve:[[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]];_scrollView.contentInset = newContentInsets;_scrollView.scrollIndicatorInsets = newContentInsets;/** Depending on visual layout, _focusedControl should either be the input field (UITextField,..) or another element* that should be visible, e.g. a purchase button below an amount text field* it makes sense to set _focusedControl in delegates like -textFieldShouldBeginEditing: if you have multiple input fields*/if (_focusedControl) {CGRect controlFrameInScrollView = [_scrollView convertRect:_focusedControl.bounds fromView:_focusedControl]; // if the control is a deep in the hierarchy below the scroll view, this will calculate the frame as if it were a direct subviewcontrolFrameInScrollView = CGRectInset(controlFrameInScrollView, 0, -10); // replace 10 with any nice visual offset between control and keyboard or control and top of the scroll view.CGFloat controlVisualOffsetToTopOfScrollview = controlFrameInScrollView.origin.y - _scrollView.contentOffset.y;CGFloat controlVisualBottom = controlVisualOffsetToTopOfScrollview + controlFrameInScrollView.size.height;// this is the visible part of the scroll view that is not hidden by the keyboardCGFloat scrollViewVisibleHeight = _scrollView.frame.size.height - scrollViewKeyboardIntersection.size.height;if (controlVisualBottom > scrollViewVisibleHeight) { // check if the keyboard will hide the control in question// scroll up until the control is in placeCGPoint newContentOffset = _scrollView.contentOffset;newContentOffset.y += (controlVisualBottom - scrollViewVisibleHeight);// make sure we don't set an impossible offset caused by the "nice visual offset"// if a control is at the bottom of the scroll view, it will end up just above the keyboard to eliminate scrolling inconsistenciesnewContentOffset.y = MIN(newContentOffset.y, _scrollView.contentSize.height - scrollViewVisibleHeight);[_scrollView setContentOffset:newContentOffset animated:NO]; // animated:NO because we have created our own animation context around this code} else if (controlFrameInScrollView.origin.y < _scrollView.contentOffset.y) {// if the control is not fully visible, make it so (useful if the user taps on a partially visible input fieldCGPoint newContentOffset = _scrollView.contentOffset;newContentOffset.y = controlFrameInScrollView.origin.y;[_scrollView setContentOffset:newContentOffset animated:NO]; // animated:NO because we have created our own animation context around this code}}[UIView commitAnimations];
}// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillHide:(NSNotification*)notification
{// if we have no view or are not visible in any window, we don't careif (!self.isViewLoaded || !self.view.window) {return;}NSDictionary *userInfo = notification.userInfo;[UIView beginAnimations:nil context:NULL];[UIView setAnimationDuration:[[userInfo valueForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue]];[UIView setAnimationCurve:[[userInfo valueForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]];// undo all that keyboardWillShow-magic// the scroll view will adjust its contentOffset apropriately_scrollView.contentInset = UIEdgeInsetsZero;_scrollView.scrollIndicatorInsets = UIEdgeInsetsZero;[UIView commitAnimations];
}

#7楼

对于通用解决方案 ，这是我实现IQKeyboardManager的方法。

在此处输入图片说明

步骤1：-我在单例类中添加了UITextField ， UITextView和UIKeyboard全局通知。我称它为IQKeyboardManager 。

步骤2：-如果找到UIKeyboardWillShowNotification ， UITextFieldTextDidBeginEditingNotification或UITextViewTextDidBeginEditingNotification通知，则尝试从UIWindow.rootViewController层次结构中获取topMostViewController实例。为了正确地发现UITextField / UITextView ，需要调整topMostViewController.view的框架。

步骤3：-我相对于第一个响应的UITextField / UITextView计算了topMostViewController.view预期移动距离。

步骤4：-我根据预期的移动距离上下移动了topMostViewController.view.frame 。

步骤5：-如果找到UIKeyboardWillHideNotification ， UITextFieldTextDidEndEditingNotification或UITextViewTextDidEndEditingNotification通知，我将再次尝试从UIWindow.rootViewController层次结构中获取topMostViewController实例。

步骤6：-我计算了topMostViewController.view受干扰距离，该距离需要恢复到其原始位置。

步骤7：-我根据受干扰的距离恢复了topMostViewController.view.frame 。

步骤8：-我在应用程序加载时实例化了单例IQKeyboardManager类实例，因此应用程序中的每个UITextField / UITextView将根据预期的移动距离自动进行调整。

这就是IQKeyboardManager真正为您完成的所有工作，而无需任何代码！只需要将相关的源文件拖放到项目中即可。 IQKeyboardManager还支持“ 设备方向” ，“ 自动UIToolbar管理” ，“ KeybkeyboardDistanceFromTextField”等功能。

#8楼

我不确定是否将视图向上移动是正确的方法，但我以不同的方式进行了操作，调整了UIScrollView的大小。我在一篇小文章中详细解释了

#9楼

RPDP的代码成功地将文本字段移出了键盘。但是当您在使用和关闭键盘后滚动到顶部时，顶部已向上滚动到视图之外。对于模拟器和设备来说都是如此。要阅读该视图顶部的内容，必须重新加载该视图。

他的以下代码不应该使视图降低吗？

else
{// revert back to the normal state.rect.origin.y += kOFFSET_FOR_KEYBOARD;rect.size.height -= kOFFSET_FOR_KEYBOARD;
}

#10楼

要恢复到原始视图状态，请添加：

-(void)textFieldDidEndEditing:(UITextField *)sender{//move the main view, so that the keyboard does not hide it.if  (self.view.frame.origin.y < 0){[self setViewMovedUp:NO];}
}

#11楼

适用于许多UITextField的小修复

#pragma mark UIKeyboard handling#define kMin 150-(void)textFieldDidBeginEditing:(UITextField *)sender
{if (currTextField) {[currTextField release];}currTextField = [sender retain];//move the main view, so that the keyboard does not hide it.if (self.view.frame.origin.y + currTextField.frame.origin. y >= kMin) {[self setViewMovedUp:YES]; }
}//method to move the view up/down whenever the keyboard is shown/dismissed
-(void)setViewMovedUp:(BOOL)movedUp
{[UIView beginAnimations:nil context:NULL];[UIView setAnimationDuration:0.3]; // if you want to slide up the viewCGRect rect = self.view.frame;if (movedUp){// 1. move the view's origin up so that the text field that will be hidden come above the keyboard // 2. increase the size of the view so that the area behind the keyboard is covered up.rect.origin.y = kMin - currTextField.frame.origin.y ;}else{// revert back to the normal state.rect.origin.y = 0;}self.view.frame = rect;[UIView commitAnimations];
}- (void)keyboardWillShow:(NSNotification *)notif
{//keyboard will be shown now. depending for which textfield is active, move up or move down the view appropriatelyif ([currTextField isFirstResponder] && currTextField.frame.origin.y + self.view.frame.origin.y >= kMin){[self setViewMovedUp:YES];}else if (![currTextField isFirstResponder] && currTextField.frame.origin.y  + self.view.frame.origin.y < kMin){[self setViewMovedUp:NO];}
}- (void)keyboardWillHide:(NSNotification *)notif
{//keyboard will be shown now. depending for which textfield is active, move up or move down the view appropriatelyif (self.view.frame.origin.y < 0 ) {[self setViewMovedUp:NO];}}- (void)viewWillAppear:(BOOL)animated
{// register for keyboard notifications[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:self.view.window]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:self.view.window];
}- (void)viewWillDisappear:(BOOL)animated
{// unregister for keyboard notifications while not visible.[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
}

#12楼

注意：此答案假定您的textField在scrollView中。

我更喜欢使用scrollContentInset和scrollContentOffset来处理此问题，而不是弄乱我视图的框架。

首先，让我们听听键盘通知

//call this from viewWillAppear
-(void)addKeyboardNotifications
{[[NSNotificationCenter defaultCenter] addObserver:selfselector:@selector(keyboardWillShow:)name:UIKeyboardWillShowNotificationobject:nil];[[NSNotificationCenter defaultCenter] addObserver:selfselector:@selector(keyboardWillHide:)name:UIKeyboardWillHideNotificationobject:nil];
}
//call this from viewWillDisappear
-(void)removeKeyboardNotifications{[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

下一步是保留代表当前第一响应者的属性（当前具有键盘的UITextfield / UITextVIew）。

我们使用委托方法来设置此属性。如果您正在使用其他组件，则将需要类似的东西。

请注意，对于文本字段，我们在didBeginEditing中设置它，对于textView在shouldBeginEditing中进行设置。这是因为由于某种原因，在UIKeyboardWillShowNotification之后会调用textViewDidBeginEditing。

-(BOOL)textViewShouldBeginEditing:(UITextView * )textView{self.currentFirstResponder = textView;return YES;
}-(void)textFieldDidBeginEditing:(UITextField *)textField{self.currentFirstResponder = textField;
}

最后，这就是魔术

- (void)keyboardWillShow:(NSNotification*)aNotification{NSDictionary* info = [aNotification userInfo];CGRect kbFrame = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];/*if currentFirstResponder is overlayed by the keyboard, move it so it bottom ends where the keyboard begins*/if(self.currentFirstResponder){//keyboard origin in currentFirstResponderFrameCGPoint keyboardOrigin = [self.currentFirstResponder convertPoint:kbFrame.origin fromView:nil];float spaceBetweenFirstResponderAndKeyboard = abs(self.currentFirstResponder.frame.size.height-keyboardOrigin.y);//only scroll the scrollview if keyboard overlays the first responderif(spaceBetweenFirstResponderAndKeyboard>0){//if i call setContentOffset:animate:YES it behaves differently, not sure why[UIView animateWithDuration:0.25 animations:^{[self.scrollView setContentOffset:CGPointMake(0,self.scrollView.contentOffset.y+spaceBetweenFirstResponderAndKeyboard)];}];}}//set bottom inset to the keyboard height so you can still scroll the whole contentUIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbFrame.size.height, 0.0);_scrollView.contentInset = contentInsets;_scrollView.scrollIndicatorInsets = contentInsets;}- (void)keyboardWillHide:(NSNotification*)aNotification{UIEdgeInsets contentInsets = UIEdgeInsetsZero;_scrollView.contentInset = contentInsets;_scrollView.scrollIndicatorInsets = contentInsets;
}

#13楼

这是我针对特定布局提出的黑客解决方案。该解决方案与Matt Gallagher解决方案类似，该解决方案是将部分滚动到视图中。我还是iPhone开发的新手，也不熟悉布局的工作方式。因此，这种hack。

我的实现需要支持在单击字段时滚动，以及在用户在键盘上选择下一步时滚动。

我有一个高度为775的UIView。这些控件基本上以3个一组的形式散布在较大的空间上。我最终得到了以下IB布局。

UIView -> UIScrollView -> [UI Components]

骇客来了

我将UIScrollView的高度设置为比实际布局（1250）大500个单位。然后，我创建了一个具有需要滚动到的绝对位置的数组，以及一个基于IB标签号获取它们的简单函数。

static NSInteger stepRange[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 140, 140, 140, 140, 140, 410
};NSInteger getScrollPos(NSInteger i) {if (i < TXT_FIELD_INDEX_MIN || i > TXT_FIELD_INDEX_MAX) {return 0 ;return stepRange[i] ;
}

现在，您需要做的就是在textFieldDidBeginEditing和textFieldShouldReturn中使用以下两行代码（如果要创建下一个字段导航，则使用后者）

CGPoint point = CGPointMake(0, getScrollPos(textField.tag)) ;
[self.scrollView setContentOffset:point animated:YES] ;

一个例子。

- (void) textFieldDidBeginEditing:(UITextField *)textField
{CGPoint point = CGPointMake(0, getScrollPos(textField.tag)) ;[self.scrollView setContentOffset:point animated:YES] ;
}- (BOOL)textFieldShouldReturn:(UITextField *)textField {NSInteger nextTag = textField.tag + 1;UIResponder* nextResponder = [textField.superview viewWithTag:nextTag];if (nextResponder) {[nextResponder becomeFirstResponder];CGPoint point = CGPointMake(0, getScrollPos(nextTag)) ;[self.scrollView setContentOffset:point animated:YES] ;}else{[textField resignFirstResponder];}return YES ;
}

此方法不会像其他方法那样“回滚”。这不是必需的。同样，这是针对相当“高大”的UIView，而且我没有几天要学习内部布局引擎。

#14楼

找到最简单的解决方案

- (void)textFieldDidBeginEditing:(UITextField *)textField
{[self animateTextField: textField up: YES];
}- (void)textFieldDidEndEditing:(UITextField *)textField
{[self animateTextField: textField up: NO];
}- (void) animateTextField: (UITextField*) textField up: (BOOL) up
{const int movementDistance = 80; // tweak as neededconst float movementDuration = 0.3f; // tweak as neededint movement = (up ? -movementDistance : movementDistance);[UIView beginAnimations: @"anim" context: nil];[UIView setAnimationBeginsFromCurrentState: YES];[UIView setAnimationDuration: movementDuration];self.view.frame = CGRectOffset(self.view.frame, 0, movement);[UIView commitAnimations];
}

#15楼

对于由多个UITextFields组成的UIScrollView ，我也遇到很多问题，其中的一个或多个在编辑时会被键盘遮盖。

如果您的UIScrollView滚动不正确，则需要考虑以下事项。

1）确保您的contentSize大于UIScrollView框架的大小。理解UIScrollViews的方法是UIScrollView就像contentSize中定义的内容的查看窗口。因此，当UIScrollview滚动到任何位置时，contentSize必须大于UIScrollView 。否则，不需要滚动，因为contentSize中定义的所有内容都已经可见。顺便说一句，默认contentSize = CGSizeZero 。

2）现在您已经了解到UIScrollView确实是进入“内容”的窗口，确保键盘不会遮挡UIScrollView's查看“窗口”的方法是调整UIScrollView大小，以便在存在键盘时，将UIScrollView窗口的大小调整为仅原始UIScrollView frame.size.height减去键盘的高度。这将确保您的窗口仅是一个较小的可见区域。

3）这就是要注意的问题：第一次实现此功能时，我认为我必须获取已编辑文本字段的CGRect并调用UIScrollView's scrollRecToVisible方法。我通过调用scrollRecToVisible方法实现了UITextFieldDelegate方法textFieldDidBeginEditing 。这实际上与一个奇怪的副作用是滚动将其卡工作UITextField到位。在最长的时间内，我不知道那是什么。然后我注释掉了textFieldDidBeginEditing Delegate方法，并且一切正常！（???）。事实证明，我相信UIScrollView实际上隐式地将当前编辑的UITextField隐式UITextField入可见窗口。我对UITextFieldDelegate方法的实现以及随后对scrollRecToVisible调用是多余的，并且是造成奇怪副作用的原因。

因此，这是在键盘出现时正确滚动UIScrollView的UITextField到位的步骤。

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.- (void)viewDidLoad
{[super viewDidLoad];// register for keyboard notifications[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:self.view.window];// register for keyboard notifications[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:self.view.window];keyboardIsShown = NO;//make contentSize bigger than your scrollSize (you will need to figure out for your own use case)CGSize scrollContentSize = CGSizeMake(320, 345);self.scrollView.contentSize = scrollContentSize;
}- (void)keyboardWillHide:(NSNotification *)n
{NSDictionary* userInfo = [n userInfo];// get the size of the keyboardCGSize keyboardSize = [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;// resize the scrollviewCGRect viewFrame = self.scrollView.frame;// I'm also subtracting a constant kTabBarHeight because my UIScrollView was offset by the UITabBar so really only the portion of the keyboard that is leftover pass the UITabBar is obscuring my UIScrollView.viewFrame.size.height += (keyboardSize.height - kTabBarHeight);[UIView beginAnimations:nil context:NULL];[UIView setAnimationBeginsFromCurrentState:YES];[self.scrollView setFrame:viewFrame];[UIView commitAnimations];keyboardIsShown = NO;
}- (void)keyboardWillShow:(NSNotification *)n
{// This is an ivar I'm using to ensure that we do not do the frame size adjustment on the `UIScrollView` if the keyboard is already shown.  This can happen if the user, after fixing editing a `UITextField`, scrolls the resized `UIScrollView` to another `UITextField` and attempts to edit the next `UITextField`.  If we were to resize the `UIScrollView` again, it would be disastrous.  NOTE: The keyboard notification will fire even when the keyboard is already shown.if (keyboardIsShown) {return;}NSDictionary* userInfo = [n userInfo];// get the size of the keyboardCGSize keyboardSize = [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;// resize the noteViewCGRect viewFrame = self.scrollView.frame;// I'm also subtracting a constant kTabBarHeight because my UIScrollView was offset by the UITabBar so really only the portion of the keyboard that is leftover pass the UITabBar is obscuring my UIScrollView.viewFrame.size.height -= (keyboardSize.height - kTabBarHeight);[UIView beginAnimations:nil context:NULL];[UIView setAnimationBeginsFromCurrentState:YES];[self.scrollView setFrame:viewFrame];[UIView commitAnimations];keyboardIsShown = YES;
}

在viewDidLoad注册键盘通知
在viewDidUnload取消注册键盘键盘
确保设置了contentSize并大于viewDidLoad的UIScrollView
有键盘时缩小 UIScrollView
键盘消失后， 还原回 UIScrollView 。
使用伊娃如果键盘已经显示在屏幕上，以检测由于键盘通知每一次发送UITextField的标签即使键盘已经存在，以避免萎缩 UIScrollView时，它已经缩水

要注意的一件事是，即使您在另一个UITextField上进行选项卡UIKeyboardWillShowNotification时，即使键盘已经在屏幕上， UIKeyboardWillShowNotification也会触发。我通过使用ivar避免在键盘已经在屏幕上时调整UIScrollView大小来解决此问题。当键盘已经存在时，无意中调整UIScrollView大小将是灾难性的！

希望这段代码可以使您省去很多麻烦。

#16楼

这是使用Swift的解决方案。

import UIKitclass ExampleViewController: UIViewController, UITextFieldDelegate {@IBOutlet var scrollView: UIScrollView!@IBOutlet var textField1: UITextField!@IBOutlet var textField2: UITextField!@IBOutlet var textField3: UITextField!@IBOutlet var textField4: UITextField!@IBOutlet var textField5: UITextField!var activeTextField: UITextField!// MARK: - Viewoverride func viewDidLoad() {super.viewDidLoad()self.textField1.delegate = selfself.textField2.delegate = selfself.textField3.delegate = selfself.textField4.delegate = selfself.textField5.delegate = self}override func viewWillAppear(animated: Bool) {super.viewWillAppear(animated)self.registerForKeyboardNotifications()}override func viewWillDisappear(animated: Bool) {super.viewWillDisappear(animated)self.unregisterFromKeyboardNotifications()}// MARK: - Keyboard// Call this method somewhere in your view controller setup code.func registerForKeyboardNotifications() {let center:  NSNotificationCenter = NSNotificationCenter.defaultCenter()center.addObserver(self, selector: "keyboardWasShown:", name: UIKeyboardDidShowNotification, object: nil)center.addObserver(self, selector: "keyboardWillBeHidden:", name: UIKeyboardWillHideNotification, object: nil)}func unregisterFromKeyboardNotifications () {let center:  NSNotificationCenter = NSNotificationCenter.defaultCenter()center.removeObserver(self, name: UIKeyboardDidShowNotification, object: nil)center.removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)}// Called when the UIKeyboardDidShowNotification is sent.func keyboardWasShown (notification: NSNotification) {let info : NSDictionary = notification.userInfo!let kbSize = (info.objectForKey(UIKeyboardFrameBeginUserInfoKey)?.CGRectValue() as CGRect!).sizelet contentInsets: UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);scrollView.contentInset = contentInsets;scrollView.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.frameaRect.size.height -= kbSize.height;if (!CGRectContainsPoint(aRect, self.activeTextField.frame.origin) ) {self.scrollView.scrollRectToVisible(self.activeTextField.frame, animated: true)}}// Called when the UIKeyboardWillHideNotification is sentfunc keyboardWillBeHidden (notification: NSNotification) {let contentInsets = UIEdgeInsetsZero;scrollView.contentInset = contentInsets;scrollView.scrollIndicatorInsets = contentInsets;}// MARK: -  Text Fieldfunc textFieldDidBeginEditing(textField: UITextField) {self.activeTextField = textField}func textFieldDidEndEditing(textField: UITextField) {self.activeTextField = nil}}

#17楼

对于Swift程序员：

这将为您完成所有工作，只需将它们放在视图控制器类中，并将UITextFieldDelegate实现到视图控制器，并将textField的委托设置为self

textField.delegate = self // Setting delegate of your UITextField to self

实现委托回调方法：

func textFieldDidBeginEditing(textField: UITextField) {animateViewMoving(true, moveValue: 100)
}func textFieldDidEndEditing(textField: UITextField) {animateViewMoving(false, moveValue: 100)
}// Lifting the view up
func animateViewMoving (up:Bool, moveValue :CGFloat){let movementDuration:NSTimeInterval = 0.3let movement:CGFloat = ( up ? -moveValue : moveValue)UIView.beginAnimations( "animateView", context: nil)UIView.setAnimationBeginsFromCurrentState(true)UIView.setAnimationDuration(movementDuration )self.view.frame = CGRectOffset(self.view.frame, 0,  movement)UIView.commitAnimations()
}

对于Swift 4,4.2,5：更改

self.view.frame = CGRectOffset(self.view.frame, 0,  movement)

至

self.view.frame = self.view.frame.offsetBy(dx: 0, dy: movement)

关于此实现的最后一点说明：如果在显示键盘时将另一个视图控制器推到堆栈上，则会产生一个错误，即视图返回到其中心框架，但键盘偏移未重置。例如，您的键盘是nameField的第一个响应者，但是随后您按下了一个按钮，该按钮会将您的Help View Controller推入堆栈。要解决偏移量错误，请确保在离开视图控制器之前调用nameField.resignFirstResponder（），并确保同时调用了textFieldDidEndEditing委托方法。我在viewWillDisappear方法中执行此操作。

#18楼

试试这个短招。

- (void)textFieldDidBeginEditing:(UITextField *)textField
{[self animateTextField: textField up: YES];
}- (void)textFieldDidEndEditing:(UITextField *)textField
{[self animateTextField: textField up: NO];
}- (void) animateTextField: (UITextField*) textField up: (BOOL) up
{const int movementDistance = textField.frame.origin.y / 2; // tweak as neededconst float movementDuration = 0.3f; // tweak as neededint movement = (up ? -movementDistance : movementDistance);[UIView beginAnimations: @"anim" context: nil];[UIView setAnimationBeginsFromCurrentState: YES];[UIView setAnimationDuration: movementDuration];self.view.frame = CGRectOffset(self.view.frame, 0, movement);[UIView commitAnimations];
}

#19楼

在这里， 我找到了处理键盘的最简单解决方案。

您只需要在示例代码下方复制粘贴，然后更改文本字段或要向上移动的任何视图。

步骤1

只需将以下两种方法复制粘贴到您的控制器中

- (void)registerForKeyboardNotifications
{[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:)name:UIKeyboardDidShowNotification object:nil];[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillBeHidden:)name:UIKeyboardWillHideNotification object:nil];
}- (void)deregisterFromKeyboardNotifications
{[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardDidHideNotification object:nil];[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

第2步

分别在viewWillAppear和viewWillDisappear方法中注册和注销键盘通知。

- (void)viewWillAppear:(BOOL)animated
{[super viewWillAppear:animated];[self registerForKeyboardNotifications];
}- (void)viewWillDisappear:(BOOL)animated
{[self deregisterFromKeyboardNotifications];[super viewWillDisappear:animated];
}

第三步

灵魂部分来了，只需替换您的文本字段，然后更改高度即可移动多少。

- (void)keyboardWasShown:(NSNotification *)notification
{NSDictionary* info = [notification userInfo];CGSize currentKeyboardSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;//you need replace your textfield instance hereCGPoint textFieldOrigin = self.tokenForPlaceField.frame.origin;CGFloat textFieldHeight = self.tokenForPlaceField.frame.size.height;CGRect visibleRect = self.view.frame;visibleRect.size.height -= currentKeyboardSize.height;if (!CGRectContainsPoint(visibleRect, textFieldOrigin)){//you can add yor desired height how much you want move keypad up, by replacing "textFieldHeight" belowCGPoint scrollPoint = CGPointMake(0.0, textFieldOrigin.y - visibleRect.size.height  + textFieldHeight); //replace textFieldHeight to currentKeyboardSize.height, if you want to move up with more height[self.scrollView setContentOffset:scrollPoint animated:YES];}
}- (void)keyboardWillBeHidden:(NSNotification *)notification
{[self.scrollView setContentOffset:CGPointZero animated:YES];
}

参考：好， 请感谢这个分享了这个漂亮的代码片段，干净解决方案的人。

希望这对外面的人有帮助。

#20楼

使用此第三方，您甚至不需要写一行

https://github.com/hackiftekhar/IQKeyboardManager

下载项目并将IQKeyboardManager拖放到项目中。如果发现任何问题，请阅读README文件。

伙计们确实消除了管理键盘的麻烦。

#21楼

本文档详细介绍了此问题的解决方案。在“移动位于键盘下方的内容”下查看源代码。这很简单。

编辑：注意在示例中有一个小故障。您可能需要监听UIKeyboardWillHideNotification而不是UIKeyboardDidHideNotification 。否则，在键盘关闭动画期间，将修剪键盘后面的滚动视图。

#22楼

@ user271753

要将视图恢复为原始添加，请执行以下操作：

-(BOOL)textFieldShouldReturn:(UITextField *)textField{[textField resignFirstResponder];[self setViewMovedUp:NO];return YES;
}

#23楼

Shiun表示：“事实证明，我相信UIScrollView实际上隐式地将当前编辑的UITextField隐式地带到可见窗口中”，这对于iOS 3.1.3似乎是正确的，但对于3.2、4.0或4.1则不成立。我必须添加一个显式的scrollRectToVisible，以使UITextField在iOS> = 3.2上可见。

#24楼

实际上最好使用docs中提供的Apple的实现。但是，他们提供的代码是错误的。替换在keyboardWasShown:找到的部分keyboardWasShown:在以下注释的正下方：

NSDictionary* info = [aNotification userInfo];
CGRect keyPadFrame=[[UIApplication sharedApplication].keyWindow convertRect:[[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue] fromView:self.view];
CGSize kbSize =keyPadFrame.size;
CGRect activeRect=[self.view convertRect:activeField.frame fromView:activeField.superview];
CGRect aRect = self.view.bounds;
aRect.size.height -= (kbSize.height);CGPoint origin =  activeRect.origin;
origin.y -= backScrollView.contentOffset.y;
if (!CGRectContainsPoint(aRect, origin)) {CGPoint scrollPoint = CGPointMake(0.0,CGRectGetMaxY(activeRect)-(aRect.size.height));[backScrollView setContentOffset:scrollPoint animated:YES];
}

Apple的代码存在以下问题：（1）它们始终计算该点是否在视图的框架内，但它是ScrollView ，因此它可能已经滚动了，您需要考虑该偏移量：

origin.y -= scrollView.contentOffset.y

（2）他们将contentOffset按键盘的高度移动，但是我们想要相反的操作（我们希望将contentOffset按屏幕上可见的高度移动，而不是不是）：

activeField.frame.origin.y-(aRect.size.height)

#25楼

斯威夫特4 。

您可以使用带有Animation UIKeyBoard轻松地上下移动UITextField或UIView 在此处输入图片说明

import UIKitclass ViewController: UIViewController, UITextFieldDelegate {@IBOutlet var textField: UITextField!@IBOutlet var chatView: UIView!override func viewDidLoad() {super.viewDidLoad()NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange), name: .UIKeyboardWillChangeFrame, object: nil)}override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {textField.resignFirstResponder()}@objc func keyboardWillChange(notification: NSNotification) {let duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Doublelet curve = notification.userInfo![UIKeyboardAnimationCurveUserInfoKey] as! UIntlet curFrame = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValuelet targetFrame = (notification.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValuelet deltaY = targetFrame.origin.y - curFrame.origin.yprint("deltaY",deltaY)UIView.animateKeyframes(withDuration: duration, delay: 0.0, options: UIViewKeyframeAnimationOptions(rawValue: curve), animations: {self.chatView.frame.origin.y+=deltaY // Here You Can Change UIView To UITextField},completion: nil)}func textFieldShouldReturn(_ textField: UITextField) -> Bool {textField.resignFirstResponder()return true}}

#26楼

当UITextField位于UITableViewCell应自动设置滚动。

如果不是，则可能是由于错误的tableview代码/设置。

例如，当我按照下面的方式在底部有一个UITextField长表重新加载时，

-(void) viewWillAppear:(BOOL)animated
{[self.tableview reloadData];
}

那么我在底部的文本框被当我在文本框内单击时出现的键盘遮盖了。

为了解决这个问题，我必须这样做-

-(void) viewWillAppear:(BOOL)animated
{//add the following line to fix issue[super viewWillAppear:animated];[self.tableview reloadData];
}

#27楼

我整理了一个通用的UIScrollView ， UITableView甚至UICollectionView子类，该子类负责将其中的所有文本字段移出键盘。

当键盘即将出现时，子类将找到要编辑的子视图，并调整其框架和内容偏移量以确保该视图可见，并带有动画以匹配键盘弹出窗口。键盘消失后，它将恢复其先前的大小。

它基本上可以与任何设置一起使用，可以是基于UITableView的界面，也可以是由手动放置的视图组成的界面。

这是tis：用于将文本字段移出键盘的解决方案

#28楼

在textFieldDidBeginEditting和textFieldDidEndEditing调用函数[self animateTextField:textField up:YES]如下所示：

-(void)textFieldDidBeginEditing:(UITextField *)textField
{ [self animateTextField:textField up:YES];
}- (void)textFieldDidEndEditing:(UITextField *)textField
{[self animateTextField:textField up:NO];
}-(void)animateTextField:(UITextField*)textField up:(BOOL)up
{const int movementDistance = -130; // tweak as neededconst float movementDuration = 0.3f; // tweak as neededint movement = (up ? movementDistance : -movementDistance); [UIView beginAnimations: @"animateTextField" context: nil];[UIView setAnimationBeginsFromCurrentState: YES];[UIView setAnimationDuration: movementDuration];self.view.frame = CGRectOffset(self.view.frame, 0, movement);[UIView commitAnimations];
}

希望这段代码对您有所帮助。

在Swift 2中

func animateTextField(textField: UITextField, up: Bool)
{let movementDistance:CGFloat = -130let movementDuration: Double = 0.3var movement:CGFloat = 0if up {movement = movementDistance}else {movement = -movementDistance}UIView.beginAnimations("animateTextField", context: nil)UIView.setAnimationBeginsFromCurrentState(true)UIView.setAnimationDuration(movementDuration)self.view.frame = CGRectOffset(self.view.frame, 0, movement)UIView.commitAnimations()
}func textFieldDidBeginEditing(textField: UITextField)
{self.animateTextField(textField, up:true)
}func textFieldDidEndEditing(textField: UITextField)
{self.animateTextField(textField, up:false)
}

SWIFT 3

 func animateTextField(textField: UITextField, up: Bool){let movementDistance:CGFloat = -130let movementDuration: Double = 0.3var movement:CGFloat = 0if up{movement = movementDistance}else{movement = -movementDistance}UIView.beginAnimations("animateTextField", context: nil)UIView.setAnimationBeginsFromCurrentState(true)UIView.setAnimationDuration(movementDuration)self.view.frame = self.view.frame.offsetBy(dx: 0, dy: movement)UIView.commitAnimations()}func textFieldDidBeginEditing(textField: UITextField){self.animateTextField(textField: textField, up:true)}func textFieldDidEndEditing(textField: UITextField){self.animateTextField(textField: textField, up:false)}

#29楼

不需要滚动视图即可移动视图框架。您可以更改的框架viewcontroller's视图，使整个视图向上移动就足以把键盘上方的firstresponder文本字段。当我遇到此问题时，我创建了执行此操作的UIViewController的子类。它观察到键盘将出现通知，并找到第一个响应者子视图，并且（如果需要）它将主视图向上动画化，以使第一个响应者位于键盘上方。当键盘隐藏时，它将使视图返回原来的位置。

要使用此子类，请将您的自定义视图控制器作为GMKeyboardVC的子类，并且它继承了此功能（只要确保您实现viewWillAppear和viewWillDisappear它们必须调用super）。该类在github上。

#30楼

一直在为该主题的初学者寻找好的教程，在这里找到了最好的教程。

在本教程底部的MIScrollView.h示例中，请确保在空格处

@property (nonatomic, retain) id backgroundTapDelegate;

正如你看到的。