如何从带有随机文本和内部 phone 数字的字符串中获取 phone 数字 URL

Question

在我的 iOS 应用程序中，我有一堆包含文本和一个嵌入式 phone 号码的 alertController 消息，我想为用户提供从 alerControllerAction 进行调用的可能性，为此，我需要能够动态地从字符串中提取 phone 数字，将其转换为 phone 数字 URL 并让旧的 swift 人完成它的工作，所以这就是我在遵循 NSDataDetector 周围的十二个 tuto 之后所做的事情，我想出了这个函数，由于某种原因，我的 phoneNumberURL 对象中总是 returns nil。你们能检查一下并告诉我是否有问题吗？

这里什么都没有：

private func showsHelpMessage() 
{

        let title = Bundle.main.localizedString(forKey: "account.help.popup.title",
                                                value: "",
                                                table: AFPConfig.sharedInstance.kLocalizableTable)

        let message = Bundle.main.localizedString(forKey: "account.help.popup.message",
                                                  value: "",
                                                  table: AFPConfig.sharedInstance.kLocalizableTable)


        var phoneNumber : String = ""
        let detectorType: NSTextCheckingResult.CheckingType = [.phoneNumber]
        do
        {
            let detector = try NSDataDetector(types: detectorType.rawValue)
            let phoneNumberDetected = detector.firstMatch(in: message, options: [], range: NSRange(location: 0, length: message.utf16.count))

            phoneNumber = (phoneNumberDetected?.phoneNumber)!
            phoneNumber = phoneNumber.removeWhitespace() // added this because i noticed the NSURL kept crashing because of the whitespaces between numbers
        }
        catch
        {
            phoneNumber = "+33969390215"
        }

        if let phoneURL = NSURL(string: ("tel://" + phoneNumber))
        {
            let alertAccessibility = UIAlertController(title: title, message: message, preferredStyle: UIAlertController.Style.alert)


            alertAccessibility.addAction(UIAlertAction(title: "Appeler ?", style: .destructive, handler: { (action) in
                UIApplication.shared.open(phoneURL as URL, options: [:], completionHandler: nil)
            }))
            alertAccessibility.addAction(UIAlertAction(title: "Annuler", style: UIAlertAction.Style.cancel, handler: nil))

            self.present(alertAccessibility, animated: true, completion: nil)
        }
    }

提前致谢，干杯！

Answer 1

您的方法似乎没问题，但我怀疑您的输入数据可能是真正的问题所在。尝试在操场上进行试验：

import Foundation

enum PhoneNumberDetectionError: Error {
    case nothingDetected
    case noNumberFound
}

func extractPhoneURL(from string: String) throws -> URL? {
    let detector = try! NSDataDetector(types: NSTextCheckingResult.CheckingType.phoneNumber.rawValue)

    guard let detected = detector.firstMatch(in: string, options: [], range: NSRange(location: 0, length: string.utf16.count)) else {
        throw PhoneNumberDetectionError.nothingDetected
    }

    guard let number = detected.phoneNumber else {
        throw PhoneNumberDetectionError.noNumberFound
    }

    let noWhiteSpaces = number.filter { ![=10=].isWhitespace }

    return URL(string: "tel://\(noWhiteSpaces)")
}

let strings = [
    "This 555–692–7753 is a phone number",
    "This 1 555 692 7753 is a phone number",
    "This 123 is an incomplete phone number",
    "This does not have a phone number",
    "This +1 555 692 7753 is a phone number",
]

strings.forEach {
    do {
        guard let url = try extractPhoneURL(from: [=10=]) else {
            print("❌ '\([=10=])' failed to make URL")
            return
        }
        print("✅ '\([=10=])' -> \(url.absoluteString)")
    } catch {
        print("❌ '\([=10=])' : \(error)")
    }
}

如果您认为应该有效的任何内容都得到一个 ❌，那是您的问题。

此外，您在几个地方有一些奇怪的 ( )：

// Odd combination of optional unwrap and force-unwrap
phoneNumber = (phoneNumberDetected?.phoneNumber)!

// Concise equivalent
phoneNumber = phoneNumberDetected!.phoneNumber

并且：

// The brackets around the string concatenation don't achieve anything
if let phoneURL = NSURL(string: ("tel://" + phoneNumber))

// Better
if let phoneURL = NSURL(string: "tel://" + phoneNumber)

Answer 2

解决提取不能确定为 phone 数字的问题（参见我的其他答案的评论）：

与其尝试从消息中提取数字并希望它是一个 phone 数字而不是距离或门牌号，不如在本地化字符串中引入占位符 (%d) 并在消息中插入 phone 号码：

enum LocalPhoneNumbers {
    case reception = 1000
    case helpdesk = 4567
    // etc.
}

private function showHelpMessage() {
    // "Call the helpdesk on %d"
    let format = Bundle.main.localizedString(forKey: "account.help.popup.message",
                                              value: "",
                                              table: AFPConfig.sharedInstance.kLocalizableTable)

    let number = LocalPhoneNumbers.helpdesk.rawValue
    let message = String(format: format, number)
    let url = URL(string: "tel://\(number)")

    // Code to show alert here...

}

如何从带有随机文本和内部 phone 数字的字符串中获取 phone 数字 URL

How to get phone number URL from string with random text and a phone number inside

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