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
对我有用
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}
var isScroll = false
@objc func keyboardWillShow(sender: NSNotification) {
if( !isScroll ){
self.view.frame.origin.y -= 150
isScroll = true
}
}
@objc func keyboardWillHide(sender: NSNotification) {
if( isScroll ){
self.view.frame.origin.y += 150
isScroll = false
}
}
其他回答
如果你在同一个VC中有2个或更多的文本字段，用户点击其中一个，然后点击另一个，不调用keyboardWillHide函数，视图会再向上一次，这是不必要的，因为你会有键盘，一个空格，它有键盘的高度，然后视图，使用我编辑的答案中的代码:
override func viewDidLoad() {
super.viewDidLoad()
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name: UIKeyboardWillHideNotification, object: nil)
}
func keyboardWillShow(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
self.view.frame.origin.y -= keyboardSize.height
}
}
func keyboardWillHide(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
self.view.frame.origin.y += keyboardSize.height
}
}
为了解决这个问题，将两个函数"KeyboardWillShow/Hide"替换为:
func keyboardWillShow(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
if view.frame.origin.y == 0{
self.view.frame.origin.y -= keyboardSize.height
}
}
}
func keyboardWillHide(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
if view.frame.origin.y != 0 {
self.view.frame.origin.y += keyboardSize.height
}
}
}
func registerForKeyboardNotifications()
{
//Keyboard
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(keyboardWasShown), name: UIKeyboardDidShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(keyboardWillBeHidden), name: UIKeyboardDidHideNotification, object: nil)
}
func deregisterFromKeyboardNotifications(){
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
}
func keyboardWasShown(notification: NSNotification){
let userInfo: NSDictionary = notification.userInfo!
let keyboardInfoFrame = userInfo.objectForKey(UIKeyboardFrameEndUserInfoKey)?.CGRectValue()
let windowFrame:CGRect = (UIApplication.sharedApplication().keyWindow!.convertRect(self.view.frame, fromView:self.view))
let keyboardFrame = CGRectIntersection(windowFrame, keyboardInfoFrame!)
let coveredFrame = UIApplication.sharedApplication().keyWindow!.convertRect(keyboardFrame, toView:self.view)
let contentInsets = UIEdgeInsetsMake(0, 0, (coveredFrame.size.height), 0.0)
self.scrollViewInAddCase .contentInset = contentInsets;
self.scrollViewInAddCase.scrollIndicatorInsets = contentInsets;
self.scrollViewInAddCase.contentSize = CGSizeMake((self.scrollViewInAddCase.contentSize.width), (self.scrollViewInAddCase.contentSize.height))
}
/**
this method will fire when keyboard was hidden
- parameter notification: contains keyboard details
*/
func keyboardWillBeHidden (notification: NSNotification) {
self.scrollViewInAddCase.contentInset = UIEdgeInsetsZero
self.scrollViewInAddCase.scrollIndicatorInsets = UIEdgeInsetsZero
}
Swift 4中的Simpelst方法
import UIKit
class ViewController: UIViewController, UITextFieldDelegate {
@IBOutlet var myTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: .UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
myTextField.resignFirstResponder()
}
func keyboardWillShow(notification: NSNotification) {
// let duration = notification.userInfo?[UIKeyboardAnimationDurationUserInfoKey]
// print("duration",duration)
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
let keyboardHeight : Int = Int(keyboardSize.height)
print("keyboardWillShow",keyboardHeight)
if let height = UserDefaults.standard.value(forKey: "keyboardHeight") as? (Int) {
moveTextField(myTextField, moveDistance: -height as Int, moveDuration: 0.43, up: true)
}else{
UserDefaults.standard.set(keyboardHeight, forKey: "keyboardHeight")
moveTextField(myTextField, moveDistance: -keyboardHeight, moveDuration: 0.43, up: true)
}
}
}
func keyboardWillHide(notification: NSNotification){
if let height = UserDefaults.standard.value(forKey: "keyboardHeight") as? (Int) {
moveTextField(myTextField, moveDistance: -height as Int, moveDuration: 0.25, up: false)
}
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
func moveTextField(_ textField: UITextField, moveDistance: Int, moveDuration: Double, up: Bool) {
let movement: CGFloat = CGFloat(up ? moveDistance : -moveDistance)
UIView.beginAnimations("animateTextField", context: nil)
UIView.setAnimationBeginsFromCurrentState(true)
UIView.setAnimationDuration(moveDuration)
self.view.frame = self.view.frame.offsetBy(dx: 0, dy: movement)
UIView.commitAnimations()
}
}
你也可以上下移动只有UITextFiled而不是整个屏幕(UIView)。 用这种方法。
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange), name: .UIKeyboardWillChangeFrame, object: nil)
And
@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.textField.frame.origin.y+=deltaY
},completion: nil)
}
对我有用
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}
var isScroll = false
@objc func keyboardWillShow(sender: NSNotification) {
if( !isScroll ){
self.view.frame.origin.y -= 150
isScroll = true
}
}
@objc func keyboardWillHide(sender: NSNotification) {
if( isScroll ){
self.view.frame.origin.y += 150
isScroll = false
}
}
我已经阅读了答案，并通过以下代码行解决了我的问题:
class ViewController: UIViewController, UITextFieldDelegate {
@IBOutlet weak var titleField: UITextField!
@IBOutlet weak var priceField: UITextField!
@IBOutlet weak var detailsField: UTtextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do not to forget to set the delegate otherwise the textFieldShouldReturn(_:)
// won't work and the keyboard will never be hidden.
priceField.delegate = self
titleField.delegate = self
detailsField.delegate = self
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow),
name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide),
name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
self.view.endEditing(true)
return false
}
func keyboardWillShow(notification: NSNotification) {
var translation:CGFloat = 0
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
if detailsField.isEditing{
translation = CGFloat(-keyboardSize.height)
}else if priceField.isEditing{
translation = CGFloat(-keyboardSize.height / 3.8)
}
}
UIView.animate(withDuration: 0.2) {
self.view.transform = CGAffineTransform(translationX: 0, y: translation)
}
}
func keyboardWillHide(notification: NSNotification) {
UIView.animate(withDuration: 0.2) {
self.view.transform = CGAffineTransform(translationX: 0, y: 0)
}
}
}
我有几个UITextFields，并希望视图移动不同取决于哪个textField被点击。
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