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iOS에 키보드가 나타나면 UIView를 위로 이동
UIView가 있지만 UIScrollView 내부에 없습니다. 키보드가 나타나면보기 위로 이동하고 싶습니다. 이 솔루션을 사용하기 전에 : 키보드가있을 때 UITextField를 위로 이동하려면 어떻게해야합니까? .
잘 작동했습니다. 그러나 텍스트 필드에 데이터를 삽입 한 후 다른보기로 이동하고이 페이지로 돌아 오면 점프 만했고 텍스트 필드를 볼 수 없었습니다. 이 문제에 대한 더 나은 해결책이 있습니까?
키보드를 표시하고 숨기려면 다음 코드를 사용하십시오.
//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)];
}
- (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;
}];
}
나는 UIView전체를 .js 파일로 감싸지 않고도 일시적으로 스크롤링하는 것을 관리 하는 작은 카테고리를 작성 했습니다 UIScrollView. 여기에서 "scroll"이라는 동사를 사용하는 것은 아마도 이상적이지 않을 것입니다. 왜냐하면 스크롤 뷰가 관련되어 있다고 생각하게 만들 수 있기 때문입니다. 우리는 단지 UIView(또는 UIView하위 클래스) 의 위치를 애니메이션하는 것 입니다.
여기에는 내 양식과 레이아웃에 적합한 매직 넘버가 포함되어 있으며, 이는 귀하에게 적합하지 않을 수 있으므로 귀하의 특정 요구 사항에 맞게 조정하는 것이 좋습니다.
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
UIViewController로 가져 오면 할 수 있습니다.
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
[self.view scrollToView:textField];
}
-(void) textFieldDidEndEditing:(UITextField *)textField
{
[self.view scrollToY:0];
[textField resignFirstResponder];
}
...또는 무엇이든. 이 카테고리는 뷰의 위치를 조정하는 세 가지 좋은 방법을 제공합니다.
보기를 키보드에 바인딩하는 것도 옵션입니다 (답변 하단의 GIF 참조).
스위프트 4
확장 프로그램 사용 : (완전히 테스트되지 않음)
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)
}
}
스위프트 2 + 3
확장 사용 :
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)
}
}
용법:
// view did load...
textField.bindToKeyboard()
...
// view unload
textField.unbindToKeyboard()
결과:
중요한
보기가 언 로딩이 때 관찰자를 제거하는 것을 잊지 마세요
나는 theDuncs 답변이 매우 유용하다는 것을 알았고 아래에서 내 (리팩터링 된) 버전을 찾을 수 있습니다.
주요 변경 사항
- 이제 하드 코딩 값 대신 키보드 크기를 동적으로 가져옵니다.
- 중복 코드 를 방지 하기 위해 UIView 애니메이션을 자체 방법으로 추출했습니다.
- 하드 코딩되지 않고 메서드에 전달되는 허용 기간
- (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;
}];
}
Daniel Krom의 솔루션을 기반으로합니다. 이것은 swift 3.0 버전입니다 . AutoLayout 과 잘 작동하며 키보드가 나타나면 전체보기를 이동합니다.
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
})
}
}
사용 방법 : 다음 과 같은 bindToKeyboard기능 추가 viewDidLoad:
override func viewDidLoad() {
super.viewDidLoad()
view.bindToKeyboard()
}
그리고 unbindFromKeyboarddeinit 에 기능을 추가하십시오 .
deinit {
view.unbindFromKeyboard()
}
KeyBoard와 관련된 모든 문제에 대해 IQKeyBoardManager를 사용하면 도움이됩니다. https://github.com/hackiftekhar/IQKeyboardManager .
이걸로 해봐:-
[[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;
}
theDunc의 답변을 기반으로 하지만 자동 레이아웃으로 Swift로 작성되었습니다.
@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()
}
}
키보드의 크기를 동적으로 계산하는 사용자 지정 컨트롤러를 구현하여 장치를 회전하는 동안에도 나타나고 사라질 때 textField를 스크롤합니다. 모든 iOS 기기에서 작동합니다. 컨트롤러를 상속하여 필요한 것을 갖기 만하면됩니다. 다음 링크에서 모든 지침과 함께 찾을 수 있습니다 : https://github.com/mikthebig/ios-textfield-scroll
관찰자 알림을 추가하지 않는 간단한 솔루션
-(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];
}
}
어디
#define kOFFSET_FOR_KEYBOARD 80.0
스위프트 5
위의 Daniel Krom의 답변 업데이트 버전 :
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
})
}
}
스위프트 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)
}
누군가가 Swift 에서 솔루션을 찾고 있다면 코드에 다음을 던지십시오.
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
}
}
여기 있습니다. 그래도 UIView와 함께이 코드를 사용했습니다. scrollview에 대해 이러한 조정을 할 수 있어야합니다.
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()
}
}
올바른 위치에서 알림을 제거하는 것을 잊지 마십시오.
func removeKeyboardNotifications() {
NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}
i just created a lightweight keyboard handler to follow keyboard frame.
Usage:
self.keyboardHandler = [EDKeyboardHandler new];
[self.keyboardHandler listenWithBlock:^(KeyboardInfo *model)
{
//adjust view positions according to keyboard position here
}];
and the KeyboardInfo model has the following properties:
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
check GitHub project for details and cocoaPods integration.
Declare a delegate, assign your text field to the delegate and then include these methods.
Assuming you have a login form with email and password text fields, this code will fit perfectly:
-(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;
}];
}
It can be done easily & automatically if that textfield is in a table's cell (even when the table.scrollable = NO).
NOTE that: the position and size of the table must be reasonable. e.g:
- if the y position of table is 100 counted from the view's bottom, then the 300 height keyboard will overlap the whole table.
- 테이블이
height = 10이고textfield키보드가 보이기 위해 나타날 때 100 위로 스크롤해야하는 경우 해당 텍스트 필드는 테이블 경계를 벗어납니다.
참고 URL : https://stackoverflow.com/questions/11282449/move-uiview-up-when-the-keyboard-appears-in-ios
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