当键盘出现在 iOS 中时，将 UIView 上移
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【中文标题】当键盘出现在 iOS 中时，将 UIView 上移【英文标题】：Move UIView up when the keyboard appears in iOS 【发布时间】：2012-07-02 04:54:58 【问题描述】：我有一个 UIView，它不在 UIScrollView 里面。当键盘出现时，我想上移我的视图。在我尝试使用此解决方案之前：How can I make a UITextField move up when the keyboard is present?.
工作正常。但是在文本字段中插入数据后，它会将我带到另一个视图，当我回到这个页面时，它只是在跳跃，我看不到我的文本字段。有没有更好的办法解决这个问题？
【问题讨论】：
【参考方案1】：- (void)viewWillAppear:(BOOL)animated
[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];
- (void)viewWillDisappear:(BOOL)animated
[super viewWillDisappear:animated];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
#pragma mark - keyboard movements
- (void)keyboardWillShow:(NSNotification *)notification
CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
[UIView animateWithDuration:0.3 animations:^
CGRect f = self.view.frame;
f.origin.y = -keyboardSize.height;
self.view.frame = f;
];
-(void)keyboardWillHide:(NSNotification *)notification
[UIView animateWithDuration:0.3 animations:^
CGRect f = self.view.frame;
f.origin.y = 0.0f;
self.view.frame = f;
];
【讨论】：
这对我来说效果很好，我将它与这个答案 link 结合起来，让键盘在用户点击屏幕上的其他任何地方时隐藏。 如果用户更改为另一个不同高度的键盘（如表情符号），它不起作用。要修复它，在 keyboardWillShow 中你应该使用： CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size; 点赞。这个解决方案比 Apple 提供的要简单得多。 Apple 解决方案无法解决我的问题，但您的问题很快。谢谢。 这项工作。但问题它也推动顶视图变得不可见。顶视图如何下移？ 这是一个非常不错的解决方案，但我建议不要将视图向上移动太多，而是先检查文本字段是否隐藏，然后将其移动隐藏的数量。【参考方案2】：使用以下代码来显示和隐藏键盘
//Declare a delegate, assign your textField to the delegate and then include these methods
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
return YES;
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil];
[self.view endEditing:YES];
return YES;
- (void)keyboardDidShow:(NSNotification *)notification
// Assign new frame to your view
[self.view setFrame:CGRectMake(0,-110,320,460)]; //here taken -110 for example i.e. your view will be scrolled to -110. change its value according to your requirement.
-(void)keyboardDidHide:(NSNotification *)notification
[self.view setFrame:CGRectMake(0,0,320,460)];
【讨论】：
键盘的大小应该由随键盘通知传递的 infoDictionary 确定，这应该用于计算适当的 yOffset 而不是静态定义一个。 这不能正确处理键盘更改通知，这意味着它不考虑用户何时在键盘语言之间切换以及更改键盘高度（在日文汉字键盘中点击表情符号按钮一个例子）。 感谢@Ani Shroff 的解决方案。向上运动并不平滑，它更像是一种离散运动。你能帮忙吗？ 我认为不需要这些通知，您可以简单地调用 textFieldShouldBeginEditing 中的 keyboardDidShow 和 textFieldShouldEndEditing 中的 keyboardDidHide 是我还是这个方法有大问题。每次在您的文本字段中开始或结束编辑时，您都会订阅通知。当你的布局加载时，订阅应该完成一次。【参考方案3】：我在UIView 上写了一个小类别，用于管理临时滚动内容，而无需将整个内容包装到UIScrollView 中。我在这里使用动词“滚动”可能并不理想，因为它可能会让您认为涉及滚动视图，但实际上并没有——我们只是为UIView（或UIView 子类）的位置设置动画.
其中嵌入了许多适合我的表单和布局的神奇数字，但可能不适合您的，因此我鼓励对其进行调整以满足您的特定需求。
UIView+FormScroll.h：
#import <Foundation/Foundation.h>
@interface UIView (FormScroll)
-(void)scrollToY:(float)y;
-(void)scrollToView:(UIView *)view;
-(void)scrollElement:(UIView *)view toPoint:(float)y;
@end
UIView+FormScroll.m：
#import "UIView+FormScroll.h"
@implementation UIView (FormScroll)
-(void)scrollToY:(float)y
[UIView beginAnimations:@"registerScroll" context:NULL];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:0.4];
self.transform = CGAffineTransformMakeTranslation(0, y);
[UIView commitAnimations];
-(void)scrollToView:(UIView *)view
CGRect theFrame = view.frame;
float y = theFrame.origin.y - 15;
y -= (y/1.7);
[self scrollToY:-y];
-(void)scrollElement:(UIView *)view toPoint:(float)y
CGRect theFrame = view.frame;
float orig_y = theFrame.origin.y;
float diff = y - orig_y;
if (diff < 0)
[self scrollToY:diff];
else
[self scrollToY:0];
@end
将它导入你的 UIViewController，然后你就可以做
- (void)textFieldDidBeginEditing:(UITextField *)textField
[self.view scrollToView:textField];
-(void) textFieldDidEndEditing:(UITextField *)textField
[self.view scrollToY:0];
[textField resignFirstResponder];
...或其他任何东西。该类别为您提供了三种很好的方法来调整视图的位置。
【讨论】：
根据keyboardWillAppear NSNotification的infoDictionary中传递的键盘尺寸确定适当的yOffset以传递给这个类别方法。 @isaac - 绝对。可以改进代码的几种方法之一。【参考方案4】：将视图绑定到键盘也是一个选项（请参阅答案底部的 GIF）
斯威夫特 4
使用扩展：（未经过全面测试）
extension UIView
func bindToKeyboard()
NotificationCenter.default.addObserver(self, selector: #selector(UIView.keyboardWillChange(notification:)), name: Notification.Name.UIKeyboardWillChangeFrame, object: nil)
func unbindToKeyboard()
NotificationCenter.default.removeObserver(self, name: Notification.Name.UIKeyboardWillChangeFrame, object: nil)
@objc
func keyboardWillChange(notification: Notification)
let duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Double
let curve = notification.userInfo![UIKeyboardAnimationCurveUserInfoKey] as! UInt
let curFrame = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
let targetFrame = (notification.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
let deltaY = targetFrame.origin.y - curFrame.origin.y
UIView.animateKeyframes(withDuration: duration, delay: 0.0, options: UIViewKeyframeAnimationOptions(rawValue: curve), animations:
self.frame.origin.y+=deltaY
,completion: nil)
斯威夫特 2 + 3
使用扩展：
extension UIView
func bindToKeyboard()
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(UIView.keyboardWillChange(_:)), name: UIKeyboardWillChangeFrameNotification, object: nil)
func keyboardWillChange(notification: NSNotification)
let duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Double
let curve = notification.userInfo![UIKeyboardAnimationCurveUserInfoKey] as! UInt
let curFrame = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).CGRectValue()
let targetFrame = (notification.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue()
let deltaY = targetFrame.origin.y - curFrame.origin.y
UIView.animateKeyframesWithDuration(duration, delay: 0.0, options: UIViewKeyframeAnimationOptions(rawValue: curve), animations:
self.frame.origin.y+=deltaY
,completion: nil)
用法：
// view did load...
textField.bindToKeyboard()
...
// view unload
textField.unbindToKeyboard()
结果：
重要 卸载视图时不要忘记移除观察者
【讨论】：
【参考方案5】：我发现theDuncs answer 非常有用，您可以在下面找到我自己的（重构）版本：
主要变化
-
现在动态获取键盘大小，而不是硬编码值
将 UIView 动画提取到它自己的方法中到prevent duplicate code
允许将持续时间传递到方法中，而不是硬编码
- (void)viewWillAppear:(BOOL)animated
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
- (void)viewWillDisappear:(BOOL)animated
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
- (void)keyboardWillShow:(NSNotification *)notification
CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
float newVerticalPosition = -keyboardSize.height;
[self moveFrameToVerticalPosition:newVerticalPosition forDuration:0.3f];
- (void)keyboardWillHide:(NSNotification *)notification
[self moveFrameToVerticalPosition:0.0f forDuration:0.3f];
- (void)moveFrameToVerticalPosition:(float)position forDuration:(float)duration
CGRect frame = self.view.frame;
frame.origin.y = position;
[UIView animateWithDuration:duration animations:^
self.view.frame = frame;
];
【讨论】：
frame.origin.y = frame.origin.y - keyboardSize.height;否则键盘会跳出屏幕。 正是我想要的，除非你按下“听写”按钮，否则视图将永远不会再次出现，因为你使用的是UIKeyboardFrameBeginUserInfoKey而不是UIKeyboardFrameEndUserInfoKey。你应该编辑它，否则完美！
我已经修改了我的答案以包含@damjandd的建议 - 谢谢！
修改self.view.frame后还需要[self.view layoutSubviews]。如果@view 包含 tableTable，这将修复 iphone X 上的安全边距问题。【参考方案6】：
基于 Daniel Krom 的解决方案。这是 swift 3.0 中的版本。与 AutoLayout 配合使用效果很好，并在键盘出现时移动整个视图。
extension UIView
func bindToKeyboard()
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange), name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
func unbindFromKeyboard()
NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
@objc
func keyboardWillChange(notification: NSNotification)
guard let userInfo = notification.userInfo else return
let duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as! Double
let curve = userInfo[UIKeyboardAnimationCurveUserInfoKey] as! UInt
let curFrame = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
let targetFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
let deltaY = targetFrame.origin.y - curFrame.origin.y
UIView.animateKeyframes(withDuration: duration, delay: 0.0, options: UIViewKeyframeAnimationOptions(rawValue: curve), animations:
self.frame.origin.y += deltaY
)
使用方法：
在viewDidLoad中添加bindToKeyboard函数like：
override func viewDidLoad()
super.viewDidLoad()
view.bindToKeyboard()
并在deinit中添加unbindFromKeyboard函数：
deinit
view.unbindFromKeyboard()
【讨论】：
你在objective c中有这个吗？ @Moxarth 抱歉，但我没有。在 Objective-C 中，您可以创建类别。这是解释如何做的链接：developer.apple.com/library/content/documentation/Cocoa/… 整个视图在视图和键盘之间保持黑色视图。 在 iPhone X 上失败。【参考方案7】：斯威夫特 5
上面 Daniel Krom 的答案更新版本：
extension UIView
func bindToKeyboard()
NotificationCenter.default.addObserver(
self,
selector: #selector(UIView.keyboardWillChange(notification:)),
name: UIResponder.keyboardWillChangeFrameNotification,
object: nil
)
func unbindToKeyboard()
NotificationCenter.default.removeObserver(
self,
name: UIResponder.keyboardWillChangeFrameNotification,
object: nil
)
@objc func keyboardWillChange(notification: Notification)
let duration = notification.userInfo![UIResponder.keyboardAnimationDurationUserInfoKey] as! Double
let curve = notification.userInfo![UIResponder.keyboardAnimationCurveUserInfoKey] as! UInt
let curFrame = (notification.userInfo![UIResponder.keyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
let targetFrame = (notification.userInfo![UIResponder.keyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
let deltaY = targetFrame.origin.y - curFrame.origin.y
UIView.animateKeyframes(withDuration: duration, delay: 0.0, options: UIView.KeyframeAnimationOptions(rawValue: curve), animations:
self.frame.origin.y += deltaY
)
【讨论】：
【参考方案8】：对于所有与 KeyBoard 相关的问题，只需使用 IQKeyBoardManager 这很有帮助。 https://github.com/hackiftekhar/IQKeyboardManager.
【讨论】：
【参考方案9】：试试这个：-
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector (keyboardDidShow:)
name: UIKeyboardDidShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector (keyboardDidHide:)
name: UIKeyboardDidHideNotification object:nil];
-(void) keyboardDidShow: (NSNotification *)notif
CGSize keyboardSize = [[[notif userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize.height+[self getTableView].tableFooterView.frame.size.height, 0.0);
[self getTableView].contentInset = contentInsets;
[self getTableView].scrollIndicatorInsets = contentInsets;
CGRect rect = self.frame; rect.size.height -= keyboardSize.height;
if (!CGRectContainsPoint(rect, self.frame.origin))
CGPoint scrollPoint = CGPointMake(0.0, self.frame.origin.y - (keyboardSize.height - self.frame.size.height));
[[self getTableView] setContentOffset:scrollPoint animated:YES];
-(void) keyboardDidHide: (NSNotification *)notif
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
[self getTableView].contentInset = contentInsets;
[self getTableView].scrollIndicatorInsets = contentInsets;
【讨论】：
【参考方案10】：基于theDunc's answer，但使用 Swift 编写并带有 Autolayout。
@IBOutlet weak var bottomConstraint: NSLayoutConstraint! // connect the bottom of the view you want to move to the bottom layout guide
override func viewWillAppear(animated: Bool)
super.viewWillAppear(animated)
NSNotificationCenter.defaultCenter().addObserver(self,
selector: #selector(ConversationViewController.keyboardWillShow(_:)),
name: UIKeyboardWillShowNotification,
object: nil)
NSNotificationCenter.defaultCenter().addObserver(self,
selector: #selector(ConversationViewController.keyboardWillHide(_:)),
name: UIKeyboardWillHideNotification,
object: nil)
override func viewWillDisappear(animated: Bool)
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
super.viewWillDisappear(animated)
// MARK: - Keyboard events
func keyboardWillShow(notification: NSNotification)
if let userInfo = notification.userInfo,
keyboardFrame = userInfo[UIKeyboardFrameBeginUserInfoKey]
let keyboardSize = keyboardFrame.CGRectValue().size
self.bottomConstraint.constant = keyboardSize.height
UIView.animateWithDuration(0.3)
self.view.layoutIfNeeded()
func keyboardWillHide(notification: NSNotification)
self.bottomConstraint.constant = 0
UIView.animateWithDuration(0.3)
self.view.layoutIfNeeded()
【讨论】：
【参考方案11】：我已经实现了一个自定义控制器，它可以动态计算键盘的大小，当它出现和消失时滚动文本字段，即使在设备旋转期间也是如此。适用于所有 ios 设备。只需简单地继承控制器即可拥有您需要的东西。您可以在以下链接中找到所有说明：https://github.com/mikthebig/ios-textfield-scroll
【讨论】：
刚刚为您的出色解决方案打开了一个拉取请求，因此它还可以支持 UITextView 类型的输入字段，而不仅仅是 UITextField：github.com/mikthebig/ios-textfield-scroll/pulls【参考方案12】：不添加观察者通知的简单解决方案
-(void)setViewMovedUp:(BOOL)movedUp
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3]; // if you want to slide up the view
CGRect 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)textFieldDidEndEditing:(UITextField *)sender
if (self.view.frame.origin.y >= 0)
[self setViewMovedUp:NO];
-(void)textFieldDidBeginEditing:(UITextField *)sender
//move the main view, so that the keyboard does not hide it.
if (self.view.frame.origin.y >= 0)
[self setViewMovedUp:YES];
在哪里
#define kOFFSET_FOR_KEYBOARD 80.0
【讨论】：
不要使用此代码 - 没有设置 kOFFSET_FOR_KEYBOARD 对所有语言、设备和方向都有效。从 UIKeyboardWillShowNotification 和 UIKeyboardWillHideNotification 获取键盘高度和外观动画持续时间。【参考方案13】：斯威夫特 4
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange), name: .UIKeyboardWillChangeFrame, object: nil)
@objc func keyboardWillChange(notification: NSNotification)
let duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Double
let curve = notification.userInfo![UIKeyboardAnimationCurveUserInfoKey] as! UInt
let curFrame = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
let targetFrame = (notification.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
let deltaY = targetFrame.origin.y - curFrame.origin.y
UIView.animateKeyframes(withDuration: duration, delay: 0.0, options: UIViewKeyframeAnimationOptions(rawValue: curve), animations:
self.YourView.frame.origin.y+=deltaY
,completion: nil)
【讨论】：
【参考方案14】：以防万一有人在 Swift 中寻找解决方案，请将其放入您的代码中：
override func viewWillAppear(_ animated: Bool)
super.viewWillAppear(animated)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: .UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(notification:)), name: .UIKeyboardWillHide, object: nil)
override func viewWillDisappear(_ animated: Bool)
super.viewWillDisappear(animated)
NotificationCenter.default.removeObserver(self, name: .UIKeyboardWillShow, object: nil)
NotificationCenter.default.removeObserver(self, name: .UIKeyboardWillHide, object: nil)
@objc func keyboardWillShow(notification: Notification)
if let userInfo = notification.userInfo
if let keyboardSize = (userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue
UIView.animate(withDuration: 0.3)
var alteredFrame = self.view.frame
alteredFrame.origin.y = -keyboardSize.height
self.view.frame = alteredFrame
@objc func keyboardWillHide(notification: Notification)
UIView.animate(withDuration: 0.3)
var alteredFrame = self.view.frame
alteredFrame.origin.y = 0.0
self.view.frame = alteredFrame
【讨论】：
【参考方案15】：给你。不过，我已将此代码与 UIView 一起使用。您应该能够对滚动视图进行这些调整。
func addKeyboardNotifications()
NotificationCenter.default.addObserver(self,
selector: #selector(keyboardWillShow(notification:)),
name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self,
selector: #selector(keyboardWillHide(notification:)),
name: NSNotification.Name.UIKeyboardWillHide, object: nil)
func keyboardWillShow(notification: NSNotification)
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
let duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Double
// if using constraints
// bottomViewBottomSpaceConstraint.constant = keyboardSize.height
self.view.frame.origin.y -= keyboardSize.height
UIView.animate(withDuration: duration)
self.view.layoutIfNeeded()
func keyboardWillHide(notification: NSNotification)
let duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Double
//if using constraint
// bottomViewBottomSpaceConstraint.constant = 0
self.view.frame.origin.y = 0
UIView.animate(withDuration: duration)
self.view.layoutIfNeeded()
不要忘记在正确的位置删除通知。
func removeKeyboardNotifications()
NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillHide, object: nil)
【讨论】：
【参考方案16】：我刚刚创建了一个轻量级键盘处理程序来跟随键盘框架。
用法：
self.keyboardHandler = [EDKeyboardHandler new];
[self.keyboardHandler listenWithBlock:^(KeyboardInfo *model)
//adjust view positions according to keyboard position here
];
KeyboardInfo 模型具有以下属性：
typedef enum : NSUInteger
KeyboardStatusDidShow,
KeyboardStatusWillShow,
KeyboardStatusDidHide,
KeyboardStatusWillHide,
KeyboardStatus;
@interface KeyboardInfo:NSObject
@property (nonatomic,readonly) NSTimeInterval animationDuration;
@property (nonatomic,readonly) CGRect keyboardFrame;
@property (nonatomic,readonly) NSInteger animationCurve;
@property (nonatomic,readonly) KeyboardStatus status;
@end
查看GitHub 项目以了解详细信息和 cocoaPods 集成。
【讨论】：
【参考方案17】：声明一个委托，将您的文本字段分配给委托，然后包含这些方法。
假设您有一个包含电子邮件和密码文本字段的登录表单，此代码将非常适合：
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
[self.emailTextField resignFirstResponder];
[self.passwordTextField resignFirstResponder];
- (BOOL)textFieldShouldReturn:(UITextField *)textField
if (self.emailTextField == textField)
[self.passwordTextField becomeFirstResponder];
else
[self.emailTextField resignFirstResponder];
[self.passwordTextField resignFirstResponder];
return NO;
- (void)viewWillAppear:(BOOL)animated
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
- (void)viewWillDisappear:(BOOL)animated
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
#pragma mark - keyboard movements
- (void)keyboardWillShow:(NSNotification *)notification
CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
[UIView animateWithDuration:0.3 animations:^
CGRect f = self.view.frame;
f.origin.y = -0.5f * keyboardSize.height;
self.view.frame = f;
];
-(void)keyboardWillHide:(NSNotification *)notification
[UIView animateWithDuration:0.3 animations:^
CGRect f = self.view.frame;
f.origin.y = 0.0f;
self.view.frame = f;
];
【讨论】：
[super viewWillDisappear:animated]; 呢？
这是为了移除在 viewWillAppear 中添加的观察者。【参考方案18】：
如果textfield 在表格的单元格中（即使table.scrollable = NO），它可以轻松自动地完成。
注意：桌子的位置和大小必须合理。例如：
如果表格的 y 位置从视图底部算起 100，则 300 高度的键盘将覆盖整个表格。 如果表格的height = 10 和其中的textfield 在键盘出现时必须向上滚动100 才能可见，那么该文本字段将超出表格的范围。
【讨论】：
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iOS开发-cell里面有textField,出现键盘自动上移