I added a target with editingChanged to the UITextField like this:
self.addTarget(self, action: #selector(self.textChanged), for: .editingChanged)
But if you are typing and iOS suggests the autocorrect and you tap next to where you are typing in the UITextField, the suggestion gets placed into the UITextField, but I did not get notified by the editingChanged.
I had the same problem with the UITextView and managed to "fix" it by setting the delegate and overriding
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool
So I tried doing the same with the UITextField and expected to get the same result. So I set the delegate and override
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool
However, still no callback when the autocorrect gets applied.
As an example, this is the autocorrect I'm talking about:
If you click on the field next to the word you're typing right now, the autocorrect gets applied. But no callback.
Does anybody have a solution for this?
For anybody looking for a solution here. I don't have a solution. I kept the editingChanged and added editingDidEnd. And made sure I always called self.view.endEditing(true) before I accessed the data. Not the best solution, but for now the only one I got.
Now I have a question is about how to observer keyboard touch in iOS.for example, if I click the 'A','B',or any key in keyboard ,how can I monitor it.I try to add an gestureRecognizer in keyboard. I can monitor it in iOS 7, iOS 9.In iOS 10, it can't work.I don't know why,so I look for another way to implement the function.
You can get entered character from
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool
{
Print(string)
Return true
}
Delegate method. You must need to set delegate of textfield you are entering text to.
iOS has a built-in functionality where user can set up text replacements in
Settings > General > Keyboards > Text Replacement
In my Swift iOS app's UITextField, I need to know when user used this text replacement so I can take appropriate action. My instinct was to use
func textField(tf: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
but interestingly, this function is not invoked on this kind of text replacement, are there any other ways to solve this?
I tested the shouldChangeCharactersInRange function in this setting and it does see the text expansion. I tested with:
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
print(string.characters.count)
return true
}
You can watch the character count jump immediately after the text expansion.
Make sure your textField is hooked up with an IBOutlet and you have set the class as a delegate (textField.delegate = self in viewDidLoad).
Once you see this working you can of course identify text expansion and handle any way you wish.
How do i pass the value of the text from the UITextField into another view controller. Currently, when I override the func prepareForSegue(), it is being called before the user finished editing the textfield, so the value passed is always null.
You have a couple of ways to go about this:
Directly access the text value of your TextField instead of your model, which sounds like it is updated after didFinishEditing
Instead of updating your model only on didFinishEditing you can update it every time the text changes by implementing internal func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool, and getting the new value with let newString = (textField.text! as NSString).stringByReplacingCharactersInRange(range, withString: string)
I have a question about iOS UIKeyboard.
I have a UITextField and I would to have the keyboard with only uppercase characters.
I use a storyboard and I tried to set the Cpitalization as "All characters" to UITextField properties.
But this not solve my problem...any suggestion?
Set your textfield type autocapitalizationType to UITextAutocapitalizationTypeAllCharacters on the UITextField
self.yourTexField.autocapitalizationType = UITextAutocapitalizationTypeAllCharacters;
After call delegate
// delegate method
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSRange lowercaseCharRange = [string rangeOfCharacterFromSet:[NSCharacterSet lowercaseLetterCharacterSet]];
if (lowercaseCharRange.location != NSNotFound) {
textField.text = [textField.text stringByReplacingCharactersInRange:range
withString:[string uppercaseString]];
return NO;
}
return YES;
}
Swift 5.4.2
self.yourTextField.autocapitalizationType = .allCharacters
One issue I have with some of the above answers is if you try and set textfield.text, you will lose the cursor position. So if a user tries to edit the middle of the text, the cursor will jump to the end.
Here is my Swift solution, still using UITextFieldDelegate:
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
if textField == textFieldToUppercase {
if string == "" {
// User presses backspace
textField.deleteBackward()
} else {
// User presses a key or pastes
textField.insertText(string.uppercaseString)
}
// Do not let specified text range to be changed
return false
}
return true
}
For those looking for a Swift version.
Swift 4
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
textField.text = (textField.text! as NSString).replacingCharacters(in: range, with: string.uppercased())
return false
}
Original answer
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
textField.text = (textField.text as NSString).stringByReplacingCharactersInRange(range, withString: string.uppercaseString)
return false
}
Using the Capitalization: All Characters property just forces keyboard to open with caps lock on, but lets the user to turned it off.
The syntax is now
Swift 2
textField.autocapitalizationType = UITextAutocapitalizationType.AllCharacters
Swift 3
textField.autocapitalizationType = .allCharacters
This is a different approach I used, where it does the following:
Enforces capitalization as soon as the character is entered
Catches situations where the user disables caps lock even if it textfield is set to auto caps
Allows for easy editing
Works with Swift 2.2
First, register a notification to be updated whenever any changes occur in the textfield.
textField.addTarget(self, action: #selector(YourClassName.textFieldDidChange(_:)), forControlEvents: UIControlEvents.EditingChanged)
Then, implement textFieldDidChange.
func textFieldDidChange(textField: UITextField) {
textField.text = textField.text?.uppercaseString
}
I chose this to avoid a situation where the user sees an uneven experience of some capitalized, but then changed once they move to the next character.
You should avoid to use delegate method
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool
because this will trigger an unwanted behaviour with iOS 13 + QuickPath typing (the iOS' Swiftkey Keyboard counterpart).
If you swipe on the keyboard and write "hello", it will write "HELLOHELLOHELLOHELLOHELLO" into the textfield. This is because the method is called multiple times and it appends the just changed text via textField.text = uppercasedValue.
The right way is to observe the .editingChange event and uppercase then the value. For example:
func awakeFromNib() {
textField.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged)
}
and
#objc func textFieldDidChange() {
textField.text = textField.text?.uppercased()
}
Swift 3 / Swift 4 / Swift 5
Just one line code in ViewDidLoad/ViewDidAppear:
If you simply want to see the characters typed regardless of the UPPER/lower case to all CAPITALS/UPPER CASE paste below code either in ViewDidLoad/ViewDidAppear
self.myTextField.autocapitalizationType = .allCharacters
above line changes all letters into CAPITALS while you type automatically
Set UITextField property autocapitalizationType to UITextAutocapitalizationTypeAllCharacters. This will make all characters to appear in upper case. Also visit here to find more about textfields
SwiftUI
For SwiftUI the Syntax for autocapitalization and Keyboard type selection is:
TextField("Your Placeholder", text: $emailAddress)
.keyboardType(.emailAddress)
.autocapitalization(.none)
You can use the following options for autocapitalization:
.none //Specifies that there is no automatic text capitalization.
.words //Specifies automatic capitalization of the first letter of each word.
.sentences //Specifies automatic capitalization of the first letter of each sentence.
.allCharacters //Specifies automatic capitalization of all characters, such as for entry of two-character state abbreviations for the United States.
Swift 4.0 Version:
First set the delegate for the textfield you want to uppercase to the current ViewController (click drag from the textfield to the currentViewController to set the delegate).
After add the extension:
extension CurrentViewController: UITextFieldDelegate{
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
//refference to the textfield you want to target
if textField.tag == 5{
textField.text = (textField.text! as NSString).replacingCharacters(in: range, with: string.uppercased())
return false
}
return true
}
}
You can also use this code.
-(BOOL) textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
// Uppercase for string which you need
textField.text = [textField.text stringByReplacingCharactersInRange:range
withString:[string uppercaseString]];
// return NO because You have already done it in above code
return NO;
}
The simplest way would be to implement the editing changed method of the text field and set the textfield's text value to upper case representation of the entered text.
#property (nonatomic, strong) IBOutlet UITextField *yourTextfield
// add target in code or use interface builder
[self.yourTextField addTarget:self
action:#selector(uppercaseTextField)
forControlEvents:UIControlEventEditingChanged];
- (IBAction)uppercaseTextField:(UITextField*)textField
{
textField.text = [textField.text uppercaseString];
}
Finally I found the way that respects also editing text in the middle of the string in UITextField.
The problem is that if you replace whole text by UITextFiled.text property the actual cursor moves to end of text. So you need to use .replace() method to specify exactly which characters you want to update to upperCase.
Last thing is to return string.isEmpty as return value of function - otherwise you are not allowing deleting of text.
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if let text = textField.text, let textRange = Range(range, in: text) {
let uppercasedString = string.uppercased()
let updatedText = text.replacingCharacters(in: textRange, with: uppercasedString)
if let selectedTextRange = textField.selectedTextRange {
textField.replace(selectedTextRange, withText: uppercasedString)
approveButtonState(vin: updatedText)
}
return string.isEmpty
}
return false
}
Maybe it's a bit late for an answer here, but as I have a working solution someone might find it useful.
Well, in the following textfield delegate method, check if the new string contains any lowercase characters. If so, then:
Append the character that was just typed to the textfield's text.
Make all the textfield's text uppercased.
Make sure that false is returned by the method.
Otherwise just return true and let the method work as expected.
Here's its implementation:
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
var returnValue = true
let lowercaseRange = string.rangeOfCharacter(from: CharacterSet.lowercaseLetters)
if let _ = lowercaseRange?.isEmpty {
returnValue = false
}
if !returnValue {
textField.text = (textField.text! + string).uppercased()
}
return returnValue
}
The above has worked perfectly for me, and a similar implementation works for textviews too, after making the proper adjustments first of course.
Hope it helps!
/**
We take full control of the text entered so that lowercase cannot be inserted
we replace lowercase to uppercase
*/
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
// No spaces allowed
if string == " " {
return false
}
// delete key pressed
if string == "" {
textField.deleteBackward()
return false
}
// We only allow alphabet and numbers
let numbersAndLettersSet = CharacterSet.alphanumerics
if string.lowercased().rangeOfCharacter(from: numbersAndLettersSet) == nil {
return false
}
// Add the entered text
textField.insertText(string.uppercased())
// Return false as we are doing full control
return false
}
Here there's my situation and how I achieved to force the upper text:
custom class (UITextField subclass)
don't want to use delegate UITextFieldDelegate methods
Solution proposed from #CodeBender was pretty much what I was looking for but the cursor always jump to the end as noticed from #Dan.
class MyCustomTextField: UITextField {
...
addTarget(self, action: #selector(upperText), for: .editingChanged)
...
...
#objc private func upperText() {
let textRange = selectedTextRange
text = text?.uppercased()
selectedTextRange = textRange
}
This will set the cursor always in the correct position (where it was) even if user adds text in "the middle".
On text change we can change to uppercase
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if textField == txtEmail {
textField.text = (textField.text! as NSString).replacingCharacters(in: range, with: string.uppercased())
return false
}
return true
}
Using the following text field delegate method it can be done:
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range
replacementString:(NSString *)string {
//--- Making uppercase ---//
if (textField == yourTextField ) {
NSRange lowercaseCharRange;
lowercaseCharRange = [string rangeOfCharacterFromSet:[NSCharacterSet lowercaseLetterCharacterSet]];
if (lowercaseCharRange.location != NSNotFound) {
textField.text = [textField.text stringByReplacingCharactersInRange:range
withString:[string uppercaseString]];
return NO;
}
}
}
Hope this helps.