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Simple Phone Number Formatting for String + UITextField
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| // Usage: | |
| // ------ | |
| // /* add the action somewhere: */ | |
| // phoneTextField.addTarget(self, action: #selector(updatePhoneFormat), for: .editingChanged) | |
| // /* implement the update action: */ | |
| // func updatePhoneFormat() { phoneTextField.formatPhoneNumber() } | |
| import UIKit | |
| extension String { | |
| var phoneFormat: String { | |
| /** | |
| * NOTE: This assumes US country code. | |
| */ | |
| var text = trimNonNumbers() | |
| let length = text.lengthOfBytes(using: .utf8) | |
| switch length { | |
| case 11 where text.characters.first == "1": | |
| // example: `1 (222) 333 4444` | |
| text.insert(" ", at: text.index(text.startIndex, offsetBy: 7)) | |
| text.insert(contentsOf: ") ".characters, at: text.index(text.startIndex, offsetBy: 4)) | |
| text.insert(contentsOf: " (".characters, at: text.index(text.startIndex, offsetBy: 1)) | |
| case 8...10 where text.characters.first != "1": | |
| // example: `(222) 333 4444` | |
| text.insert(contentsOf: " ".characters, at: text.index(text.startIndex, offsetBy: 6)) | |
| text.insert(contentsOf: ") ".characters, at: text.index(text.startIndex, offsetBy: 3)) | |
| text.insert(contentsOf: "(".characters, at: text.index(text.startIndex, offsetBy: 0)) | |
| default: | |
| break | |
| } | |
| return text | |
| } | |
| func trimNonNumbers() -> String { | |
| return components(separatedBy: CharacterSet.decimalDigits.inverted).joined() | |
| } | |
| } | |
| extension UITextField { | |
| func formatPhoneNumber() { | |
| /** | |
| * Note: This dance is to keep the cursor position in the same relative spot | |
| * while editing characters in the middle of the phone number. | |
| */ | |
| let pos = selectedTextRange?.start | |
| let range = textRange(from: beginningOfDocument, to: pos ?? endOfDocument) | |
| let diffBefore: Int = { | |
| guard let range = range else { return 0 } | |
| let leftOfCursorLength = text(in: range)?.lengthOfBytes(using: .utf8) ?? 0 | |
| let leftOfCursorTrimmed = text(in: range)?.trimNonNumbers().lengthOfBytes(using: .utf8) ?? 0 | |
| return leftOfCursorTrimmed - leftOfCursorLength | |
| }() | |
| text = text?.phoneFormat | |
| let diffAfter: Int = { | |
| guard let range = range else { return 0 } | |
| let leftOfCursorLength = text(in: range)?.lengthOfBytes(using: .utf8) ?? 0 | |
| let leftOfCursorTrimmed = text(in: range)?.trimNonNumbers().lengthOfBytes(using: .utf8) ?? 0 | |
| let temp = leftOfCursorTrimmed - leftOfCursorLength | |
| guard | |
| let pos = pos, | |
| let newPos = position(from: pos, offset: -temp), | |
| let newRange = textRange(from: beginningOfDocument, to: newPos) | |
| else { | |
| return temp | |
| } | |
| let newLeftOfCursorLength = text(in: newRange)?.lengthOfBytes(using: .utf8) ?? 0 | |
| let newLeftOfCursorTrimmed = text(in: newRange)?.trimNonNumbers().lengthOfBytes(using: .utf8) ?? 0 | |
| return newLeftOfCursorTrimmed - newLeftOfCursorLength | |
| }() | |
| if let oldPos = pos, let newPos = position(from: oldPos, offset: diffBefore - diffAfter) { | |
| selectedTextRange = textRange(from: newPos, to: newPos) | |
| } | |
| } | |
| } |
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