{"id":32005,"date":"2023-01-26T03:48:20","date_gmt":"2023-01-25T22:18:20","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-set-up-uitextfielddelegate-for-multiple-text-fields-closed\/"},"modified":"2023-01-26T03:48:20","modified_gmt":"2023-01-25T22:18:20","slug":"solved-how-to-set-up-uitextfielddelegate-for-multiple-text-fields-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-set-up-uitextfielddelegate-for-multiple-text-fields-closed\/","title":{"rendered":"[Solved] How to set up UITextFieldDelegate for multiple text fields? [closed]"},"content":{"rendered":"

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If your goal is to have all three text fields follow the same rule, set the delegate<\/code> for all three. The shouldChangeCharactersIn<\/code> only needs to check the \u201ccurrent\u201d text field into which the user is currently typing.<\/p>\n

A minor observation, but I also would avoid recreating the CharacterSet<\/code> of allowed characters repeatedly. You can simply make that a property.<\/p>\n

That reduces it down to something like:<\/p>\n

private let allowedCharacters = CharacterSet(charactersIn: \"ABCDEFG\u011eHI\u0130JKLMNO\u00d6PRS\u015eTU\u00dcVYZ\")\n\nfunc textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {\n    if (textField.text?.count ?? 0) - range.length + string.count > 1 {\n        return false\n    }\n\n    return allowedCharacters.isSuperset(of: CharacterSet(charactersIn: string.localizedUppercase))\n}\n<\/code><\/pre>\n
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If you want them only entering uppercase characters, I would:<\/p>\n