Uppercase characters in UItextfield

Question

I have a question about iOS UIKeyboard.

I have a UITextField and I would to have the keyboard with only uppercase characters.<

Answer 1

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.

Answer 2

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.

Answer 3

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
    }
}

Answer 4

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".

Answer 5

The syntax is now

Swift 2

textField.autocapitalizationType = UITextAutocapitalizationType.AllCharacters

Swift 3

textField.autocapitalizationType = .allCharacters

Answer 6

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.