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】：
标签： objective-c ios xcode uiview uiviewcontroller
- (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】：
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】：
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】：
将视图绑定到键盘也是一个选项（请参阅答案底部的 GIF）
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)
}
}
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()
重要
卸载视图时不要忘记移除观察者
【讨论】：
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：
- (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】：
UIKeyboardFrameBeginUserInfoKey而不是UIKeyboardFrameEndUserInfoKey。你应该编辑它，否则完美！
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】：
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】：
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】：
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】：
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】：
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】：
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】：
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】：
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】：
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】：
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】：
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？
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：
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】：