CLPlacemark在iOS 9中为字符串

Question

我想格式化CLPlacemark为字符串.

众所周知的方法是使用,ABCreateStringWithAddressDictionary但它在iOS 9中已被弃用.警告告诉我使用CNPostalAddressFormatter.

但是,CNPostalAddressFormatter只能格式化CNPostalAddress.没有办法正确转换CLPlacemark为CNPostalAddress; 仅这3个性质通过共享CLPlacemark和CNPostalAddress:country,ISOcountryCode,和postalCode.

那么我应该如何格式化CLPlacemark为现在的字符串？

Answer 1

取地标addressDictionary并使用其"FormattedAddressLines"密钥提取地址字符串.请注意,这是字符串行的数组.

(但是,你是正确的,那些负责转换到Contacts框架的Apple开发人员似乎完全忘记了Address Book和CLPlacemark之间的交换.这是Contacts框架中的一个严重错误 - 很多人中的一个.)

编辑因为我最初发布了这个答案,Apple修复了这个错误.CLPlacemark现在有一个postalAddress属性是CNPostalAddress,然后您可以使用CNPostalAddressFormatter来获取一个漂亮的多行地址字符串.一定要import Contacts!

Answer 2

Swift 3.0

if let lines = myCLPlacemark.addressDictionary?["FormattedAddressLines"] as? [String] {
    let placeString = lines.joined(separator: ", ")
    // Do your thing
}

Answer 3

Swift 4.1(和3&4,保存1行)

我读了一个问题'我怎么能实现这个？':

extension String {
    init?(placemark: CLPlacemark?) {
        // Yadda, yadda, yadda
    }
}

两种方法

我第一次去移植AddressDictionary方法,就像其他海报一样.但这意味着失去了CNPostalAddress类和格式化程序的功能和灵活性.因此,方法2.

extension String {
    // original method (edited)
    init?(depreciated placemark1: CLPlacemark?) {
    // UPDATE: **addressDictionary depreciated in iOS 11**
        guard
            let myAddressDictionary = placemark1?.addressDictionary,
            let myAddressLines = myAddressDictionary["FormattedAddressLines"] as? [String]
    else { return nil }

        self.init(myAddressLines.joined(separator: " "))
}

    // my preferred method - let CNPostalAddressFormatter do the heavy lifting
    init?(betterMethod placemark2: CLPlacemark?) {
        // where the magic is:
        guard let postalAddress = CNMutablePostalAddress(placemark: placemark2) else { return nil }
        self.init(CNPostalAddressFormatter().string(from: postalAddress))
    }
}

等等,那是什么CLPlacemark→ CNPostalAddress初始化器？

extension CNMutablePostalAddress {
    convenience init(placemark: CLPlacemark) {
        self.init()
        street = [placemark.subThoroughfare, placemark.thoroughfare]
            .compactMap { $0 }           // remove nils, so that...
            .joined(separator: " ")      // ...only if both != nil, add a space.
    /*
    // Equivalent street assignment, w/o flatMap + joined:
        if let subThoroughfare = placemark.subThoroughfare,
            let thoroughfare = placemark.thoroughfare {
            street = "\(subThoroughfare) \(thoroughfare)"
        } else {
            street = (placemark.subThoroughfare ?? "") + (placemark.thoroughfare ?? "")
        } 
    */
        city = placemark.locality ?? ""
        state = placemark.administrativeArea ?? ""
        postalCode = placemark.postalCode ?? ""
        country = placemark.country ?? ""
        isoCountryCode = placemark.isoCountryCode ?? ""
        if #available(iOS 10.3, *) {
            subLocality = placemark.subLocality ?? ""
            subAdministrativeArea = placemark.subAdministrativeArea ?? ""
        }
    }
}

用法

func quickAndDirtyDemo() {
    let location = CLLocation(latitude: 38.8977, longitude: -77.0365)

    CLGeocoder().reverseGeocodeLocation(location) { (placemarks, _) in
        if let address = String(depreciated: placemarks?.first) {
            print("\nAddress Dictionary method:\n\(address)") }

        if let address = String(betterMethod: placemarks?.first) {
            print("\nEnumerated init method:\n\(address)") }
    }
}

/* Output:
Address Dictionary method:
The White House 1600 Pennsylvania Ave NW Washington, DC  20500 United States

Enumerated init method:
1600 Pennsylvania Ave NW
Washington DC 20500
United States
*/

在这里读到的人都会得到一件免费的T恤.(并不是的)

*此代码适用于Swift 3和4,除了flatMap删除nil值已compactMap在Swift 4.1中折旧/重命名(Doc 此处,或参见SE-187的基本原理).