Pobieranie rozmiaru klawiatury z userInfo w Swift
Próbowałem dodać trochę kodu, aby przenieść mój widok w górę, gdy pojawi się klawiatura, jednak mam problemy z tłumaczeniem przykładów Objective-C na Swift. Poczyniłem pewne postępy, ale utknąłem na jednej konkretnej linii.
Oto dwa tutoriale/pytania, które śledziłem:
Jak przenieść zawartość UIViewController w górę, gdy pojawi się Klawiatura za pomocą Swift http://www.ioscreator.com/tutorials/move-view-when-keyboard-appears
Oto kod, który aktualnie posiadam:
override func viewWillAppear(animated: Bool) {
NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillShow:", name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillHide:", name: UIKeyboardWillHideNotification, object: nil)
}
override func viewWillDisappear(animated: Bool) {
NSNotificationCenter.defaultCenter().removeObserver(self)
}
func keyboardWillShow(notification: NSNotification) {
var keyboardSize = notification.userInfo(valueForKey(UIKeyboardFrameBeginUserInfoKey))
UIEdgeInsets(top: 0, left: 0, bottom: keyboardSize.height, right: 0)
let frame = self.budgetEntryView.frame
frame.origin.y = frame.origin.y - keyboardSize
self.budgetEntryView.frame = frame
}
func keyboardWillHide(notification: NSNotification) {
//
}
W tej chwili dostaję błąd w tej linii:
var keyboardSize = notification.userInfo(valueForKey(UIKeyboardFrameBeginUserInfoKey))
Jeśli ktoś mógłby mi powiedzieć, jaka powinna być ta linijka kodu, resztę sam bym wymyślił. 10 answers
Są pewne problemy w linii
var keyboardSize = notification.userInfo(valueForKey(UIKeyboardFrameBeginUserInfoKey))
-
notification.userInfo
zwraca opcjonalny słownik[NSObject : AnyObject]?
, musi więc zostać rozpakowany przed uzyskaniem dostępu do jego wartości. - Objective-C
NSDictionary
jest mapowany do słownika Swift native, więc musisz użyj składni indeksu słownikowego (dict[key]
), aby uzyskać dostęp do wartości. - wartość musi być oddana do
NSValue
, aby można było na niej wywołaćCGRectValue
.
Wszystko to można osiągnąć za pomocą kombinacji opcjonalnych przypisanie, opcjonalne łańcuchowanie i opcjonalne odlewy:
if let userInfo = notification.userInfo {
if let keyboardSize = (userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
let contentInsets = UIEdgeInsets(top: 0, left: 0, bottom: keyboardSize.height, right: 0)
// ...
} else {
// no UIKeyboardFrameBeginUserInfoKey entry in userInfo
}
} else {
// no userInfo dictionary in notification
}
Lub w jednym kroku:
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
let contentInsets = UIEdgeInsets(top: 0, left: 0, bottom: keyboardSize.height, right: 0)
// ...
}
Aktualizacja dla Swift 3.0.1 (Xcode 8.1):
if let userInfo = notification.userInfo {
if let keyboardSize = userInfo[UIKeyboardFrameBeginUserInfoKey] as? CGRect {
let contentInsets = UIEdgeInsets(top: 0, left: 0, bottom: keyboardSize.height, right: 0)
// ...
} else {
// no UIKeyboardFrameBeginUserInfoKey entry in userInfo
}
} else {
// no userInfo dictionary in notification
}
Lub w jednym kroku:
if let keyboardSize = notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? CGRect {
let contentInsets = UIEdgeInsets(top: 0, left: 0, bottom: keyboardSize.height, right: 0)
// ...
}
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2017-01-18 10:58:18
Dla jeszcze mniej kodu warto spojrzeć na to
To było dla mnie bardzo pomocne. Musisz tylko uwzględnić ograniczenie widoku w kontrolerze widoku i użyć dwóch dodanych obserwatorów. Następnie po prostu użyj następujących metod (przypuszcza się, że tutaj przenosisz widok tableView)func keyboardWillShow(sender: NSNotification) {
if let userInfo = sender.userInfo {
if let keyboardHeight = userInfo[UIKeyboardFrameEndUserInfoKey]?.CGRectValue().size.height {
tableViewBottomConstraint.constant = keyboardHeight
UIView.animateWithDuration(0.25, animations: { () -> Void in
self.view.layoutIfNeeded()
})
}
}
}
I
func keyboardWillHide(sender: NSNotification) {
if let userInfo = sender.userInfo {
if let keyboardHeight = userInfo[UIKeyboardFrameEndUserInfoKey]?.CGRectValue().size.height {
tableViewBottomConstraint.constant = 0.0
UIView.animateWithDuration(0.25, animations: { () -> Void in self.view.layoutIfNeeded() })
}
} }
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2015-03-29 07:42:38
Jeśli używasz storyboard, zamiast manipulować samym widokiem, możesz skorzystać z automatycznego układu.
(to jest oczyszczona Wersja odpowiedzi Nicholasa)
Skonfiguruj Centrum powiadomień, aby powiadamiało cię o pojawieniu się i zniknięciu klawiatury:
override func viewWillAppear(animated: Bool) {
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)
}
I upewnij się, że usuniesz obserwatorów, gdy już ich nie potrzebujesz:
override func viewWillDisappear(animated: Bool) {
super.viewWillDisappear(animated)
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: self.view.window)
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: self.view.window)
}
Wewnątrz storyboardu, Ustaw dolne ograniczenie. Stworzyć ujście tego ograniczenie:
I ustawić stałą właściwości ograniczenia, gdy klawiatura jest pokazana lub ukryta:
func keyboardWillShow(notification: NSNotification) {
guard let keyboardHeight = (notification.userInfo! as NSDictionary).objectForKey(UIKeyboardFrameBeginUserInfoKey)?.CGRectValue.size.height else {
return
}
nameOfOutlet.constant = keyboardHeight
view.layoutIfNeeded()
}
func keyboardWillHide(notification: NSNotification) {
nameOfOutlet.constant = 0.0
view.layoutIfNeeded()
}
Teraz, gdy pojawi się lub zniknie klawiatura, autolayout zajmie się wszystkim.
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2016-08-16 04:53:33
To mi pomogło: https://developer.apple.com/library/ios/samplecode/UICatalog/Listings/Swift_UICatalog_TextViewController_swift.html
let userInfo = notification.userInfo!
let animationDuration: NSTimeInterval = (userInfo[UIKeyboardAnimationDurationUserInfoKey] as NSNumber).doubleValue
let keyboardScreenBeginFrame = (userInfo[UIKeyboardFrameBeginUserInfoKey] as NSValue).CGRectValue()
let keyboardScreenEndFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as NSValue).CGRectValue()
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2015-02-24 20:21:11
Swift 2
func keyboardWasShown(notification:NSNotification) {
guard let info:[NSObject:AnyObject] = notification.userInfo,
let keyboardSize:CGSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue().size else { return }
let insets:UIEdgeInsets = UIEdgeInsetsMake(self.scrollView.contentInset.top, 0.0, keyboardSize.height, 0.0)
self.scrollView.contentInset = insets
self.scrollView.scrollIndicatorInsets = insets
}
Swift 3
func keyboardWasShown(notification:NSNotification) {
guard let info:[AnyHashable:Any] = notification.userInfo,
let keyboardSize:CGSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size else { return }
let insets:UIEdgeInsets = UIEdgeInsets(top: self.scrollView.contentInset.top, left: 0.0, bottom: keyboardSize.height, right: 0.0)
self.scrollView.contentInset = insets
self.scrollView.scrollIndicatorInsets = insets
}
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2017-02-01 16:42:46
Możesz użyć tej jednej linii dla swojej linii
var keyboardSize:CGSize = userInfo.objectForKey(UIKeyboardFrameBeginUserInfoKey)!.CGRectValue().size
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2015-01-19 09:33:37
Swift 3: UPDATE
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
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)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillShow, object: self.view.window)
NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillHide, object: self.view.window)
}
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2016-12-18 17:34:06
Swift 3.0
Oto przykład pobierania rozmiaru klawiatury i używania jej do animowania widoku w górę. W moim przypadku przesuwam UIView zawierający moje pola UITextFields w górę, gdy użytkownik zaczyna pisać, aby mógł wypełnić formularz i nadal zobaczyć przycisk submit na dole.
Dodałem ujście do dolnego ograniczenia przestrzeni widoku, który chciałem animować i nazwałem go nazwanym myViewsBottomSpaceConstraint
:
@IBOutlet weak var myViewsBottomSpaceConstraint: NSLayoutConstraint!
Następnie dodałem następujący kod do mojego swift Klasa:
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
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)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillShow, object: self.view.window)
NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillHide, object: self.view.window)
}
func keyboardWillShow(notification: NSNotification) {
let userInfo = notification.userInfo as! [String: NSObject] as NSDictionary
let keyboardFrame = userInfo.value(forKey: UIKeyboardFrameEndUserInfoKey) as! CGRect
let keyboardHeight = keyboardFrame.height
myViewsBottomSpaceConstraint.constant = keyboardHeight
view.layoutIfNeeded()
}
func keyboardWillHide(notification: NSNotification) {
myViewsBottomSpaceConstraint.constant = 0.0
view.layoutIfNeeded()
}
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2017-01-08 16:48:02
Szczegóły
XCode 8.2.1, swift 3
Kod
KeyboardNotifications
import Foundation
class KeyboardNotifications {
fileprivate var _isEnabled: Bool
fileprivate var notifications: [KeyboardNotificationsType]
fileprivate var delegate: KeyboardNotificationsDelegate
init(notifications: [KeyboardNotificationsType], delegate: KeyboardNotificationsDelegate) {
_isEnabled = false
self.notifications = notifications
self.delegate = delegate
}
deinit {
if isEnabled {
isEnabled = false
}
}
}
// MARK: - enums
extension KeyboardNotifications {
enum KeyboardNotificationsType {
case willShow, willHide, didShow, didHide
var selector: Selector {
switch self {
case .willShow:
return #selector(KeyboardNotifications.keyboardWillShow(notification:))
case .willHide:
return #selector(KeyboardNotifications.keyboardWillHide(notification:))
case .didShow:
return #selector(KeyboardNotifications.keyboardDidShow(notification:))
case .didHide:
return #selector(KeyboardNotifications.keyboardDidHide(notification:))
}
}
var notificationName: NSNotification.Name {
switch self {
case .willShow:
return .UIKeyboardWillShow
case .willHide:
return .UIKeyboardWillHide
case .didShow:
return .UIKeyboardDidShow
case .didHide:
return .UIKeyboardDidHide
}
}
}
}
// MARK: - isEnabled
extension KeyboardNotifications {
private func addObserver(type: KeyboardNotificationsType) {
NotificationCenter.default.addObserver(self, selector: type.selector, name: type.notificationName, object: nil)
print("\(type.notificationName.rawValue) inited")
}
var isEnabled: Bool {
set {
if newValue {
for notificaton in notifications {
addObserver(type: notificaton)
}
} else {
NotificationCenter.default.removeObserver(self)
print("Keyboard notifications deinited")
}
_isEnabled = newValue
}
get {
return _isEnabled
}
}
}
// MARK: - Notification functions
extension KeyboardNotifications {
@objc
func keyboardWillShow(notification: NSNotification) {
delegate.keyboardWillShow?(notification: notification)
}
@objc
func keyboardWillHide(notification: NSNotification) {
delegate.keyboardWillHide?(notification: notification)
}
@objc
func keyboardDidShow(notification: NSNotification) {
delegate.keyboardDidShow?(notification: notification)
}
@objc
func keyboardDidHide(notification: NSNotification) {
delegate.keyboardDidHide?(notification: notification)
}
}
KeyboardNotificationsDelegate
import Foundation
@objc
protocol KeyboardNotificationsDelegate {
@objc optional func keyboardWillShow(notification: NSNotification)
@objc optional func keyboardWillHide(notification: NSNotification)
@objc optional func keyboardDidShow(notification: NSNotification)
@objc optional func keyboardDidHide(notification: NSNotification)
}
Użycie
class ViewController: UIViewController {
private var keyboardNotifications: KeyboardNotifications!
override func viewDidLoad() {
super.viewDidLoad()
...
keyboardNotifications = KeyboardNotifications(notifications: [.willShow, .willHide, .didShow, .didHide], delegate: self)
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
keyboardNotifications.isEnabled = true
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
keyboardNotifications.isEnabled = false
}
}
extension ViewController: KeyboardNotificationsDelegate {
// If you don't need this func you can remove it
func keyboardWillShow(notification: NSNotification) {
...
}
// If you don't need this func you can remove it
func keyboardWillHide(notification: NSNotification) {
...
}
// If you don't need this func you can remove it
func keyboardDidShow(notification: NSNotification) {
...
}
// If you don't need this func you can remove it
func keyboardDidHide(notification: NSNotification) {
...
}
}
Pełna Próbka
import UIKit
class ViewController: UIViewController {
private var keyboardNotifications: KeyboardNotifications!
private var textField = UITextField(frame: CGRect(x: 40, y: 40, width: 200, height: 30))
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(textField)
// when you will tap on view (background) the keyboard will hide
// read about view.disableKeybordWhenTapped here: http://stackoverflow.com/a/42187286/4488252
view.disableKeybordWhenTapped = true
keyboardNotifications = KeyboardNotifications(notifications: [.willShow, .willHide, .didShow, .didHide], delegate: self)
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
keyboardNotifications.isEnabled = true
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
keyboardNotifications.isEnabled = false
}
}
extension ViewController: KeyboardNotificationsDelegate {
// If you don't need this func you can remove it
func keyboardWillShow(notification: NSNotification) {
print("keyboardWillShow")
let userInfo = notification.userInfo as! [String: NSObject]
let keyboardFrame = userInfo[UIKeyboardFrameEndUserInfoKey] as! CGRect
print("keyboardFrame: \(keyboardFrame)")
}
// If you don't need this func you can remove it
func keyboardWillHide(notification: NSNotification) {
print("keyboardWillHide")
}
// If you don't need this func you can remove it
func keyboardDidShow(notification: NSNotification) {
print("keyboardDidShow")
}
// If you don't need this func you can remove it
func keyboardDidHide(notification: NSNotification) {
print("keyboardDidHide")
}
}
Wynik
Log
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2017-03-06 17:20:54
Dla xamarin, można użyć c # 6
private void KeyboardWillChangeFrame(NSNotification notification)
{
var keyboardSize = notification.UserInfo.ValueForKey(UIKeyboard.FrameEndUserInfoKey) as NSValue;
if (keyboardSize != null)
{
var rect= keyboardSize.CGRectValue;
//do your stuff here
}
}
C # 7
private void KeyboardWillChangeFrame(NSNotification notification)
{
if (!(notification.UserInfo.ValueForKey(UIKeyboard.FrameEndUserInfoKey) is NSValue keyboardSize)) return;
var rect= keyboardSize.CGRectValue;
}
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2017-09-19 19:45:23