I create multiple UITextFields in my storyboard. Some text field are edited using keyboard while others using picker view. In my view controller, for the fields using pickerView, I created separate picker views for each of the text fields. For eg.
aTextField.inputView = aPickerView
Now for the text fields which are at the bottom of the screen, when I tap on one of them, picker view corresponding to that text field opens at the bottom and it hides the textfield. I want to shift the currently selected text field up when the picker view opens.
In case of keyboard, shifting of views can be done by responding to UIResponder.keyboardWillShowNotification. How to do this in case of picker view?
One solution that I can think of is observing keyboard height. When you press the picker view that has to show up the bottom textField, use keyboard height and some extra points to move it over the keyboard. Here are some helper methods to achieve that:
override func viewDidLoad() {
super.viewDidLoad()
// Add keyboard observers
addObservers()
}
private func addObservers() {
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
}
// keyboard will be active
#objc private func keyboardWillShow(notification: NSNotification) {
// Get keyboard Size
if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
// update constraints / footerview height with keyboard height "keyboardSize.height"
}
}
// keyboard will dismiss
#objc private func keyboardWillHide(notification: NSNotification) {
if (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue != nil {
// update constraints / footerview height when keyboard is hidden,
}
}
Related
I have an input accessory view called chatBoxView, which contains a custom growingTextView and couple of buttons to send the message. And this inputAccessoryView is setup in my main view controller.
override var inputAccessoryView: UIView? {
get {
return chatBoxView
}
}
override var canBecomeFirstResponder: Bool {
return true
}
So every time I go to this viewController, I see the chatBoxView at the bottom of my screen, which is wanted. However, the keyboard isn't visible yet (only the chatBoxView), but why does my KeyBoardWillShow notification keep getting called?
Also, when the keyboard is up, then disappears when I tap the outside, KeyboardWillDisappear function gets called, but KeyBoardWillShow function gets called right after.
Here are the function for the Keyboard notifications.
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
}
#objc func keyboardWillShow(notification: Notification) {
if let keyboardHeight = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue.height {
print("Notification: Keyboard will show")
DispatchQueue.main.async {
self.tableView.setBottomInset(to: keyboardHeight - self.chatBoxView.frame.height)
self.tableView.scrollToRow(at: IndexPath(row: 0, section: 0), at: .bottom, animated: true)
}
}
}
#objc func keyboardWillHide(notification: Notification) {
print("Notification: Keyboard will hide")
tableView.setBottomInset(to: 0.0)
}
So basically, I get the log "Notification: Keyboard will show", when the keyboard isn't showing and only the accessory view. Any ideas?
The problem is that you are throwing away important information in the UIResponder.keyboardFrameEndUserInfoKey. It is not enough just to look at the keyboard's height. You need to look at where the keyboard will be — look at its entire frame information. If the top of the keyboard is not going to be above the bottom of the screen, clearly you should not be doing anything. Similarly, if the keyboard frame is not going to be changing from where it was, you should not be doing anything.
In simulator, make sure you show software keyboard.
Click here or ⌘ + K
I have a collection view I made in storyboard and a container view with text field constrained to the bottom of the view programmatically. However, when I show the keyboard the collection view stays hidden underneath and I'm not sure how to. I looked and most answers say to use self.view.frame.origin.y in the keyboard notification listener but that's hasn't worked for me.
my keyboard notification code
#objc func keyboardWillShow(notification: NSNotification) {
let keyboardFrame = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
let duration = ((notification.userInfo?[UIResponder.keyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue)!
containerViewbottomAnchor?.constant = -keyboardFrame!.height
UIView.animate(withDuration: duration) {
self.view.layoutIfNeeded()
}
}
first image is the normal chat and second is the max view you ca see when the keyboard is shown. the container view contains the textfield and button which I added programmatically. they are within an input accessory view to update their positions when the keyboard comes up.
Have you tried this solution? https://stackoverflow.com/a/57438748/13042987
NotificationCenter.default.addObserver(self, selector: #selector(handleKeyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
#objc func handleKeyboardWillShow(notification: Notification) {
collectionView.scrollToItem(at: IndexPath(row: messagesList.count - 1, section: chatSection), at: .top, animated: false)
}
I managed to fix it by changing to a UICollectionview controller class
I'm working on a simple chat as a part of my App.
I have a list of Chats (i.e. friends) in a Table View Controller and Chat View Controller displaying messages for each chat. Both of them are embedded in a NavigationController, which is embedded in a TabBarController.
I want to place UITextView message text input field in a ChatViewController below my UITableVeiw that shows messages of that chat. I would also like the UITextView to look like it's embedded in a tab bar.
I've run through dozens of manuals tutorials and guides and that's where I got so far.
App simulator screenshots here: nice at the top, buggy at the bottom
Main.storyboard screenshot here
I use UITextView instead of UITextField because I want it to be able to change its size depending on content size
I use UIViewController instead of UITableViewController to be able to add another UIView along with UITableView
I don't use actual UITabBar to embed my UITextView because it behaves really weird when UITextView needs to change its height. And as far as I understood Apple doesn't support embedding UI element to UITabBar
What I do is I hide TabBar in ChatViewController viewWillAppear:
override func viewWillAppear(_ animated: Bool) {
tabBarController?.tabBar.isHidden = true
}
And I show it again in parent ChatsTableViewController:
override func viewWillAppear(_ animated: Bool) {
tabBarController?.tabBar.isHidden = false
}
Once TabBar is hidden, my custom stackView embedding textView and sendButton takes its place and operates quite normally as I want it to.
To handle keyboard behaviour properly I have an outlet for my inputStackView bottom constraint (selected on screenshot), which I update on keyboardWillShow/Hide Notifications. Code for that looks like this:
#IBOutlet weak var inputBottomConstraint: NSLayoutConstraint!
var inputBottomConstraintInitialValue: CGFloat!
//MARK: - Keyboard handling
private func enableKeyboardHideOnTap(){
NotificationCenter.default.addObserver(self, selector: #selector(ChatTableViewController.keyboardWillShow(notification:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(ChatTableViewController.keyboardWillHide(notification:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(ChatTableViewController.hideKeyboard))
self.view.addGestureRecognizer(tap)
}
#objc func hideKeyboard() {
textView.resignFirstResponder()
}
#objc func keyboardWillShow(notification: NSNotification) {
let info = notification.userInfo!
let keyboardFrame: CGRect = (info[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
let duration = info[UIKeyboardAnimationDurationUserInfoKey] as! Double
UIView.animate(withDuration: duration) { [weak self] () -> Void in
self?.inputBottomConstraint.constant = keyboardFrame.size.height + 8
self?.view.layoutIfNeeded()
}
}
#objc func keyboardWillHide(notification: NSNotification) {
let duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Double
UIView.animate(withDuration: duration) { [weak self] () -> Void in
guard let `self` = self else { return }
self.inputBottomConstraint.constant = self.inputBottomConstraintInitialValue
self.view.layoutIfNeeded()
}
}
Everything seems to work fine at this point:
TabBar is hidden in a ChatViewController and is shown in ChatsTableViewController
textView and sendButton embedded in a stackView slide along will keyboard up and down, as shown in simulator screenshots above.
The BUG appears when I swipe between ChatViewController and ChatsTableViewController instead of using NavigationControllers
When I start swiping back to ChatsTableViewController, it perform its viewWillAppear method, so tabBarController's tabBar become visible. And if I don't finish that swipe to ChatsTableViewController and go back ChatViewController, ChatViewController's viewWillAppear sets it back to invisible, but the input stackView doesn't get back to it's initial position. It just hangs there above the invisible tabBar.
I've tried moving
tabBarController?.tabBar.isHidden = false
from viewWillAppear to viewDidAppear in ChatsTableViewController.
It fixes the "floating input" issue but it adds a lag of about a second, when ChatsTableViewController is showing without tabBar. Looks not too good either.
Any ideas how that could be fixed properly?
I've been struggling with that issue for about a week))
Because your ChatsTableViewController is embedded in in UINavigationController and your ChatViewController is pushed you can override this hidesBottomBarWhenPushed in ChatViewController which will determine to show your view controller or not:
public override var hidesBottomBarWhenPushed: Bool {
get { return true }
set { super.hidesBottomBarWhenPushed = newValue }
}
This is a better way to hide the tab bar to my mind, because the frame of the view controllers will be adjusted.
Why do you change constraint on keyboard show/Hide. Try to Google inputAccesoryView, many chats use it. It’s natural behaviour is to go with the keyboard. Try FaceBook Messenger for example and see there how swiping hides the keyboard and Textfield together, you can’t accomplish this kind od behaviour with regular view.
When a user taps on a button, I'd like the keyboard to pop up (which is easy), but I want a view that goes up along with it (sticking to the top of the keyboard). This view will be have a "send a message.." textfield. When the user pushes done, I want the keyboard to go away along with the view.
How do I make this view "stick" to the keyboard?
UITextFields have a property called inputAccessoryView
- Apple Documentation
- Relevant Stack Overflow Answer
This will pin whatever view you assign as that textfield's inputAccessoryView to the top of the keyboard.
Something important from the answer in that link to remember:
Note that the view you use should neither be in the view hierarchy elsewhere, nor should you add it to some superview, this is done for you.
go to your storyboard and add a view(lets call it topKeyboardView) at the bottom of your viewController. and give it the following constraints:
bottom space to bottom layout = 0
and then add the textfield*(i prefer using textView to make it change its height when the message gets too long...)*
and your button(send) on top of topKeyboardView.
lets code now..
go to your viewController.swift and add an IBOutlet to your textField and button and add this function:
//this is will tell if the keyboard hidden or not
func addKeyboardNotifications() {
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name:UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name:UIKeyboardWillHideNotification, object: nil)
}
// MARK:- Notification
func keyboardWillShow(notification: NSNotification) {
print("keyboard is up")
}
func keyboardWillHide(notification: NSNotification) {
print("keyboard is down")
}
in your viewDidLoad call the function:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
addKeyboardNotifications()
}
run it...
When a user taps on a button, I'd like the keyboard to pop up (which is easy), but I want a view that goes up along with it (sticking to the top of the keyboard). This view will be have a "send a message.." textfield. When the user pushes done, I want the keyboard to go away along with the view.
How do I make this view "stick" to the keyboard?
UITextFields have a property called inputAccessoryView
- Apple Documentation
- Relevant Stack Overflow Answer
This will pin whatever view you assign as that textfield's inputAccessoryView to the top of the keyboard.
Something important from the answer in that link to remember:
Note that the view you use should neither be in the view hierarchy elsewhere, nor should you add it to some superview, this is done for you.
go to your storyboard and add a view(lets call it topKeyboardView) at the bottom of your viewController. and give it the following constraints:
bottom space to bottom layout = 0
and then add the textfield*(i prefer using textView to make it change its height when the message gets too long...)*
and your button(send) on top of topKeyboardView.
lets code now..
go to your viewController.swift and add an IBOutlet to your textField and button and add this function:
//this is will tell if the keyboard hidden or not
func addKeyboardNotifications() {
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name:UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name:UIKeyboardWillHideNotification, object: nil)
}
// MARK:- Notification
func keyboardWillShow(notification: NSNotification) {
print("keyboard is up")
}
func keyboardWillHide(notification: NSNotification) {
print("keyboard is down")
}
in your viewDidLoad call the function:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
addKeyboardNotifications()
}
run it...