Uppercase characters in UItextfield

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?

Solution 1:

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

Solution 2:

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
}

Solution 3:

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.