ios - 在 Swift 3.0 中使用 NSDataDetector 从字符串中提取地址元素

Question

我正在尝试使用 NSDataDetector 从字符串中找到地址。我看过NSHipster's article on NSDataDetector以及Apple's NSDataDetector documentation .我有以下方法可以从字符串中提取地址:

func getAddress(from dataString: String) -> [String] {
    let detector = try! NSDataDetector(types: NSTextCheckingResult.CheckingType.address.rawValue)
    let matches = detector.matches(in: dataString, options: [], range: NSRange(location: 0, length: dataString.utf16.count))

    var addressArray = [String]()

    // put matches into array of Strings
    for match in matches {
        let address = (dataString as NSString).substring(with: match.range)
        addressArray.append(address)
    }

    return addressArray
}

我想提取地址元素，而不是整个地址。在 NSHipster's NSDataDetector post在 Data Detector Match Types 部分，我看到地址组件，例如 NSTextCheckingCityKey , NSTextCheckingStateKey , 和 NSTextCheckingZIPKey .我无法在 NSDataDetector 的初始化中使用这些键。

我在 GitHub 上四处寻找，看看是否可以找到一个示例作为借鉴，但我唯一能找到的东西是 Objective-C 代码或主 Swift 存储库中的声明性东西。

我有 99% 的把握可以提取地址的各个组成部分，但我太笨了，搞不懂。感谢您阅读。我欢迎提出建议。

Answer 1

我以前没有用过这个类，但看起来它返回类型为 NSTextCheckingResult 的对象。如果您得到类型为 NSTextCheckingTypeAddress 的结果，那么您可以询问结果是否为 addressComponents，这将是一个包含地址不同部分的字典。

编辑:

这是我刚刚敲出的一些工作 Playground 代码:

import UIKit

var string = "Now is the time for all good programmers to babble incoherently.\n" +
"Now is the time for all good programmers to babble incoherently.\n" +
"Now is the time for all good programmers to babble incoherently.\n" +
"123 Elm Street\n" +
"Daton, OH 45404\n" +
"Now is the time for all good programmers to babble incoherently.\n" +
"2152 E Street NE\n" +
"Washington, DC 20001"

let results = getAddress(from: string)

print("matched \(results.count) addresses")
for result in results {
  let city = result[NSTextCheckingCityKey] ?? ""
  print("address dict = \(result).")
  print("    City = \"\(city)\"")
}

func getAddress(from dataString: String) -> [[String: String]] {
  let detector = try! NSDataDetector(types: NSTextCheckingResult.CheckingType.address.rawValue)
  let matches = detector.matches(in: dataString, options: [], range: NSRange(location: 0, length: dataString.utf16.count))

  var resultsArray =  [[String: String]]()
  // put matches into array of Strings
  for match in matches {
    if match.resultType == .address,
      let components = match.addressComponents {
      resultsArray.append(components)
    } else {
      print("no components found")
    }
  }
  return resultsArray
}

此代码打印:

matched 2 addresses

address dict = ["Street": "123 Elm Street", "ZIP": "45404", "City": "Daton", "State": "OH"]. City = "Daton"

address dict = ["Street": "2152 E Street NE", "ZIP": "20001", "City": "Washington", "State": "DC"]. City = "Washington"