我有一个应用,它在视图的下半部分有一个文本框。 这意味着当我在文本框中输入时,键盘会覆盖文本框。
我如何在打字时向上移动视图,这样我就可以看到我键入的内容,然后在键盘消失时将它移回原来的位置?
我到处都看了,但所有的解似乎都在Obj-C中,我还不能完全转换。
任何帮助都将不胜感激。
我有一个应用,它在视图的下半部分有一个文本框。 这意味着当我在文本框中输入时,键盘会覆盖文本框。
我如何在打字时向上移动视图,这样我就可以看到我键入的内容,然后在键盘消失时将它移回原来的位置?
我到处都看了,但所有的解似乎都在Obj-C中,我还不能完全转换。
任何帮助都将不胜感激。
当前回答
这个视频教程是最好的。7分钟长,会很有意义。这样一个简单的解决方案,当你有多个文本字段,并希望滚动视图移动“x”数量的像素时,特定的文本字段被点击。
https://youtu.be/VuiPGJOEBH4
就这些步骤:
-把你所有的文本字段放在一个滚动视图中,约束到视图的边缘。
-连接所有的文本字段和滚动视图作为视图控制器的委托。
-用IBOutlet连接所有文本字段和滚动视图。
class ViewController: UIViewController, UITextFieldDelegate {
添加UITextFieldDelegate协议到你的类中
@IBOutlet var stateAddress: UITextField!
@IBOutlet var zipAddress: UITextField!
@IBOutlet var phoneNumber: UITextField!
@IBOutlet var vetEmailAddress: UITextField!
@IBOutlet weak var scrollView: UIScrollView!
-在swift文件中添加UITextFieldDelegate方法:
func textFieldShouldReturn(textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
func textFieldDidBeginEditing(textField: UITextField) {
if (textField == self.stateAddress) {
scrollView.setContentOffset(CGPointMake(0, 25), animated: true)
}
else if (textField == self.zipAddress) {
scrollView.setContentOffset(CGPointMake(0, 57), animated: true)
}
else if (textField == self.phoneNumber) {
scrollView.setContentOffset(CGPointMake(0, 112), animated: true)
}
else if (textField == self.vetEmailAddress) {
scrollView.setContentOffset(CGPointMake(0, 142), animated: true)
}
}
func textFieldDidEndEditing(textField: UITextField) {
scrollView.setContentOffset(CGPointMake(0, 0), animated: true)
}
第一种方法只是激活键盘上的返回按钮来关闭键盘。第二个是当你点击到任何特定的文本域,然后设置你的滚动视图滚动的距离的y偏移(我的是基于我的视图控制器上的y位置25,57,112,142)。最后一个说,当你从键盘上点击时,滚动视图会回到原来的位置。
我使我的视图像素完美的这种方式!
其他回答
使用以下代码查看UITextField单击
func textFieldDidBeginEditing(textField: UITextField) {
ViewUpanimateMoving(true, upValue: 100)
}
func textFieldDidEndEditing(textField: UITextField) {
ViewUpanimateMoving(false, upValue: 100)
}
func ViewUpanimateMoving (up:Bool, upValue :CGFloat){
var durationMovement:NSTimeInterval = 0.3
var movement:CGFloat = ( up ? -upValue : upValue)
UIView.beginAnimations( "animateView", context: nil)
UIView.setAnimationBeginsFromCurrentState(true)
UIView.setAnimationDuration(durationMovement)
self.view.frame = CGRectOffset(self.view.frame, 0, movement)
UIView.commitAnimations()
}
这个功能应该在Ios中内置,但是我们需要在外部做。 插入以下代码 *当textField在键盘下时移动视图, *当textField在键盘上方时不移动视图 *在需要时根据键盘的高度移动视图。 这在所有情况下都有效并经过测试。
import UIKit
class NamVcc: UIViewController, UITextFieldDelegate
{
@IBOutlet weak var NamTxtBoxVid: UITextField!
var VydTxtBoxVar: UITextField!
var ChkKeyPadDspVar: Bool = false
var KeyPadHytVal: CGFloat!
override func viewDidLoad()
{
super.viewDidLoad()
NamTxtBoxVid.delegate = self
}
override func viewWillAppear(animated: Bool)
{
NSNotificationCenter.defaultCenter().addObserver(self,
selector: #selector(TdoWenKeyPadVyd(_:)),
name:UIKeyboardWillShowNotification,
object: nil);
NSNotificationCenter.defaultCenter().addObserver(self,
selector: #selector(TdoWenKeyPadHyd(_:)),
name:UIKeyboardWillHideNotification,
object: nil);
}
func textFieldDidBeginEditing(TxtBoxPsgVar: UITextField)
{
self.VydTxtBoxVar = TxtBoxPsgVar
}
func textFieldDidEndEditing(TxtBoxPsgVar: UITextField)
{
self.VydTxtBoxVar = nil
}
func textFieldShouldReturn(TxtBoxPsgVar: UITextField) -> Bool
{
self.VydTxtBoxVar.resignFirstResponder()
return true
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?)
{
view.endEditing(true)
super.touchesBegan(touches, withEvent: event)
}
func TdoWenKeyPadVyd(NfnPsgVar: NSNotification)
{
if(!self.ChkKeyPadDspVar)
{
self.KeyPadHytVal = (NfnPsgVar.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue().height
var NonKeyPadAraVar: CGRect = self.view.frame
NonKeyPadAraVar.size.height -= self.KeyPadHytVal
let VydTxtBoxCenVal: CGPoint? = VydTxtBoxVar?.frame.origin
if (!CGRectContainsPoint(NonKeyPadAraVar, VydTxtBoxCenVal!))
{
self.ChkKeyPadDspVar = true
UIView.animateWithDuration(1.0,
animations:
{ self.view.frame.origin.y -= (self.KeyPadHytVal)},
completion: nil)
}
else
{
self.ChkKeyPadDspVar = false
}
}
}
func TdoWenKeyPadHyd(NfnPsgVar: NSNotification)
{
if (self.ChkKeyPadDspVar)
{
self.ChkKeyPadDspVar = false
UIView.animateWithDuration(1.0,
animations:
{ self.view.frame.origin.y += (self.KeyPadHytVal)},
completion: nil)
}
}
override func viewDidDisappear(animated: Bool)
{
super.viewWillDisappear(animated)
NSNotificationCenter.defaultCenter().removeObserver(self)
view.endEditing(true)
ChkKeyPadDspVar = false
}
}
|::|有时候视图会向下,在这种情况下使用高度+/- 150:
NonKeyPadAraVar.size.height -= self.KeyPadHytVal + 150
{ self.view.frame.origin.y -= self.KeyPadHytVal - 150},
completion: nil)
{ self.view.frame.origin.y += self.KeyPadHytVal - 150},
completion: nil)
@Boris的解决方案非常好,但观点有时会被破坏。
为了实现完美的对齐,请使用下面的代码
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)}
功能:
@objc func keyboardWillShow(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
if self.view.frame.origin.y == 0{
self.view.frame.origin.y -= keyboardSize.height
}
}}
And,
@objc func keyboardWillHide(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
if self.view.frame.origin.y != 0{
self.view.frame.origin.y = 0
}
} }
斯威夫特5.0:
经过4-5个小时的战斗,我得到了一个简单的扩展UIViewController与简单的代码,就像魅力
*当TextField在键盘上方时,视图不应该移动
*不需要设置常量值为NSLayoutConstraint
*无需第三方库
*无需动画代码
*适用于tableview
*这适用于自动布局/自动调整大小
extension UIViewController {
func addKeyboardObserver() {
NotificationCenter.default.addObserver(self, selector: #selector(keyboardNotifications(notification:)),
name: UIResponder.keyboardWillChangeFrameNotification,
object: nil)
}
func removeKeyboardObserver(){
NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillChangeFrameNotification, object: nil)
}
// This method will notify when keyboard appears/ dissapears
@objc func keyboardNotifications(notification: NSNotification) {
var txtFieldY : CGFloat = 0.0 //Using this we will calculate the selected textFields Y Position
let spaceBetweenTxtFieldAndKeyboard : CGFloat = 5.0 //Specify the space between textfield and keyboard
var frame = CGRect(x: 0, y: 0, width: 0, height: 0)
if let activeTextField = UIResponder.currentFirst() as? UITextField ?? UIResponder.currentFirst() as? UITextView {
// Here we will get accurate frame of textField which is selected if there are multiple textfields
frame = self.view.convert(activeTextField.frame, from:activeTextField.superview)
txtFieldY = frame.origin.y + frame.size.height
}
if let userInfo = notification.userInfo {
// here we will get frame of keyBoard (i.e. x, y, width, height)
let keyBoardFrame = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
let keyBoardFrameY = keyBoardFrame!.origin.y
let keyBoardFrameHeight = keyBoardFrame!.size.height
var viewOriginY: CGFloat = 0.0
//Check keyboards Y position and according to that move view up and down
if keyBoardFrameY >= UIScreen.main.bounds.size.height {
viewOriginY = 0.0
} else {
// if textfields y is greater than keyboards y then only move View to up
if txtFieldY >= keyBoardFrameY {
viewOriginY = (txtFieldY - keyBoardFrameY) + spaceBetweenTxtFieldAndKeyboard
//This condition is just to check viewOriginY should not be greator than keyboard height
// if its more than keyboard height then there will be black space on the top of keyboard.
if viewOriginY > keyBoardFrameHeight { viewOriginY = keyBoardFrameHeight }
}
}
//set the Y position of view
self.view.frame.origin.y = -viewOriginY
}
}
}
添加这个扩展的UIResponder得到哪个TextField被选中
extension UIResponder {
static weak var responder: UIResponder?
static func currentFirst() -> UIResponder? {
responder = nil
UIApplication.shared.sendAction(#selector(trap), to: nil, from: nil, for: nil)
return responder
}
@objc private func trap() {
UIResponder.responder = self
}
}
然后在你的任何ViewController中使用这个
override func viewWillAppear(_ animated: Bool) {
self.addKeyboardObserver()
}
override func viewWillDisappear(_ animated: Bool) {
self.removeKeyboardObserver()
}
在func viewWillAppear中注册这个通知(_ animated: Bool) 在func中注销此通知viewWillDisappear(_ animated:Bool) 下载演示文件
Swift 3代码
var activeField: UITextField?
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(ProfileViewController.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(ProfileViewController.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}
func textFieldDidBeginEditing(_ textField: UITextField){
activeField = textField
}
func textFieldDidEndEditing(_ textField: UITextField){
activeField = nil
}
func keyboardWillShow(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
if (self.activeField?.frame.origin.y)! >= keyboardSize.height {
self.view.frame.origin.y = keyboardSize.height - (self.activeField?.frame.origin.y)!
} else {
self.view.frame.origin.y = 0
}
}
}
func keyboardWillHide(notification: NSNotification) {
self.view.frame.origin.y = 0
}