CLPlacemark到iOS 9中的字符串

Question

我想将CLPlacemark格式化为string。

众所周知的方法是使用ABCreateStringWithAddressDictionary，但它在iOS 9中被否决了。警告告诉我使用CNPostalAddressFormatter代替。

然而，CNPostalAddressFormatter只能格式化CNPostalAddress。无法正确地将CLPlacemark转换为CNPostalAddress；只有CLPlacemark和CNPostalAddress共享这3个属性：country、ISOcountryCode和postalCode。

那么，现在我应该如何将CLPlacemark格式化为string呢？

Answer 1

获取placemark的addressDictionary并使用其"FormattedAddressLines"键提取地址字符串。请注意，这是字符串行的数组。

(然而，你是正确的，负责转换到联系人框架的苹果开发人员似乎完全忘记了地址簿和CLPlacemark之间的交换。这是联系人框架中的一个严重缺陷--是众多缺陷中的一个。

编辑，因为我发布了这个答案，苹果修复了这个错误。CLPlacemark现在有一个postalAddress属性，它是一个CNPostalAddress，然后您可以使用CNPostalAddressFormatter来获得一个很好的多行地址字符串。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，节省1行)

我读到这个问题是想问：“我该如何实现这一点呢？”

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

两种方法

我和其他海报一样，第一次开始移植AddressDictionary方法。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，CLPlacemark→CNPostalAddress初始化器是什么？

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
*/

不管是谁读到这里都会得到一件免费的T恤。(不太)

*此代码在Swift 3和4中工作，但用于删除零值的flatMap已在SWIFT4.1中折旧/重命名为compactMap (Doc这里，或参考硒-187中的基本原理)。