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Swift 4中的反向地理编码

cllocationmanager swift ios

Adrian rohit chauhan · 技术社区 · 7 年前

我试图写一个简单的方法 CLLocationDegrees CLPlacemark . 正在查看 Apple's documentation

下面是我扔进操场的东西:

import CoreLocation
// this is necessary for async code in a playground
import PlaygroundSupport 
// this is necessary for async code in a playground
PlaygroundPage.current.needsIndefiniteExecution = true

func geocode(latitude: CLLocationDegrees, longitude: CLLocationDegrees) -> CLPlacemark? {
    let location = CLLocation(latitude: latitude, longitude: longitude)
    let geocoder = CLGeocoder()
    var placemark: CLPlacemark?
    geocoder.reverseGeocodeLocation(location) { (placemarks, error) in
        if error != nil {
            print("something went horribly wrong")
        }
        if let placemarks = placemarks {
            placemark = placemarks.first
        }
    }
    return placemark
}
let myPlacemark = geocode(latitude: 37.3318, longitude: 122.0312)

目前,我的方法是返回零。我不确定我的错误在哪里,但我确信这是我一方的愚蠢之举。谢谢你的阅读。

2 回复 | 直到 3 年前

Leo Dabus 3 年前

import UIKit
import CoreLocation
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true

func geocode(latitude: Double, longitude: Double, completion: @escaping (_ placemark: [CLPlacemark]?, _ error: Error?) -> Void)  {
    CLGeocoder().reverseGeocodeLocation(CLLocation(latitude: latitude, longitude: longitude)) { placemark, error in
        guard let placemark = placemark, error == nil else {
            completion(nil, error)
            return
        }
        completion(placemark, nil)
    }
}

或者简单地说:

func geocode(latitude: Double, longitude: Double, completion: @escaping (_ placemark: [CLPlacemark]?, _ error: Error?) -> Void)  {
    CLGeocoder().reverseGeocodeLocation(CLLocation(latitude: latitude, longitude: longitude), completionHandler: completion)
}

或扩展CLLocation:

extension CLLocation {
    func geocode(completion: @escaping (_ placemark: [CLPlacemark]?, _ error: Error?) -> Void) {
        CLGeocoder().reverseGeocodeLocation(self, completionHandler: completion)
    }
}

要将placemark格式化为邮寄地址,可以使用Contacts framework CNPostalAddressFormatter :

import Contacts

extension Formatter {
    static let mailingAddress: CNPostalAddressFormatter = {
        let formatter = CNPostalAddressFormatter()
        formatter.style = .mailingAddress
        return formatter
    }()
}

extension CLPlacemark {
    var mailingAddress: String? {
        postalAddress?.mailingAddress
    }
}

extension CNPostalAddress {
    var mailingAddress: String {
        Formatter.mailingAddress.string(from: self)
    }
}

地标

包含CLPlacemark对象的数组。对于大多数地理编码请求, 此数组应仅包含一个条目。然而,前向地理编码在以下情况下,请求可能会返回多个placemark对象: 指定的地址无法解析为单个位置。如果请求已取消或获取位置标记时出错信息,此参数为零。

有关CLPlacemark属性的更多信息,请查看 CLPlacemark

用法:

let location = CLLocation(latitude: -22.963451, longitude: -43.198242)
location.geocode { placemark, error in
    if let error = error as? CLError {
        print("CLError:", error)
        return
    } else if let placemark = placemark?.first {
        // you should always update your UI in the main thread
        DispatchQueue.main.async {
            //  update UI here
            print("name:", placemark.name ?? "unknown")
            
            print("address1:", placemark.thoroughfare ?? "unknown")
            print("address2:", placemark.subThoroughfare ?? "unknown")
            print("neighborhood:", placemark.subLocality ?? "unknown")
            print("city:", placemark.locality ?? "unknown")
            
            print("state:", placemark.administrativeArea ?? "unknown")
            print("subAdministrativeArea:", placemark.subAdministrativeArea ?? "unknown")
            print("zip code:", placemark.postalCode ?? "unknown")
            print("country:", placemark.country ?? "unknown", terminator: "\n\n")
            
            print("isoCountryCode:", placemark.isoCountryCode ?? "unknown")
            print("region identifier:", placemark.region?.identifier ?? "unknown")
    
            print("timezone:", placemark.timeZone ?? "unknown", terminator:"\n\n")

            // Mailind Address
            print(placemark.mailingAddress ?? "unknown")
        }
    }
}

这将打印

姓名:Morro da Saudade

地址2:597
社区:拉各亚
城市:里约热内卢
州:RJ
下级行政区:未知
邮编:22011-040

等CountryCode:BR
区域标识符:<-22.96345100,-43.19824200>半径141.83

鲁木麻黄,597
拉各亚
里约热内卢RJ
22011-040
巴西

-3

B. Wason 6 年前

关于堆栈溢出的“reversegecodelocation”有很多问题,我已经见过很多了。我正在使用Swift 4.2,我认为我的“反向代理”请求可能超时了。事实并非如此,当开始使用iPhone时,“didUpdateLocations”周期需要成熟。在“reverseGeocodeLocation”返回placemarks之前,可能需要两个或多个周期。

我编写了一个简单的应用程序,它使用“reverseGeocodeLocation”,直到在重复“didUpdateLocations”循环后返回“placemarks”。这是我自己开发的“SampleCode”。我从应用程序中学到了很多,它可能会帮助其他人了解反向地理代码请求在现实世界中的工作方式。

请对可能的改进提出意见。本准则是自由给予和自由获取的。

import Foundation
import UIKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {
    @IBAction func RefreshLocationButton(_ sender: Any) {
        self.requestingPlacemark = true
        self.placemarkData = nil
        //ï£¿^Make another Placemark Request
        self.requestCounter = 0
        self.RequestCounterLabel.text = ""
        self.LocationLabel.text = ""
        self.PlacemarkLabel.text = ""}
    @IBOutlet weak var LocationCounterLabel: UILabel!
    @IBOutlet weak var RequestCounterLabel: UILabel!
    @IBOutlet weak var LocationLabel: UILabel!
    @IBOutlet weak var PlacemarkLabel: UILabel!
    let locationManager = CLLocationManager()
    var placemarkData: CLPlacemark!
    var placemarkString: String!
    var printPlacemarkData: Bool!
    var didUpdateLocationsCounter: Int = 0
    var requestCounter: Int = 0
    var requestingPlacemark: Bool = true

override func viewDidLoad() {
    super.viewDidLoad()
    if CLLocationManager.locationServicesEnabled() {
        locationManager.requestAlwaysAuthorization()
        locationManager.delegate = self
        //locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation
        locationManager.startUpdatingLocation()
        self.RequestCounterLabel.text = ""
        self.LocationLabel.text = ""
        self.PlacemarkLabel.text = ""}}
func printPlacemarks() {
    if printPlacemarkData {
        self.placemarkString = "Placemark Data:"
        self.placemarkString = buildPlacemarkString(item: 1)
        self.placemarkString = buildPlacemarkString(item: 2)
        self.placemarkString = buildPlacemarkString(item: 3)
        self.placemarkString = buildPlacemarkString(item: 4)
        self.placemarkString = buildPlacemarkString(item: 5)
        self.placemarkString = buildPlacemarkString(item: 6)
        self.placemarkString = buildPlacemarkString(item: 7)
        self.placemarkString = buildPlacemarkString(item: 8)
        self.placemarkString = buildPlacemarkString(item: 9)
        self.placemarkString = buildPlacemarkString(item: 10)
        self.PlacemarkLabel.text = self.placemarkString
        self.printPlacemarkData = false}}
func buildPlacemarkString(item: Int) -> String {
    var elementText: String!
    var newString: String!
        switch item {
        case 1: elementText = "name: " + self.placemarkData.name!
        case 2: elementText = "subThoroughfare: " + self.placemarkData.subThoroughfare!
        case 3: elementText = "thoroughfare: " + self.placemarkData.thoroughfare!
        case 4: elementText = "postalCode: " + self.placemarkData.postalCode!
        case 5: elementText = "subLocality: " + self.placemarkData.subLocality!
        case 6: elementText = "locality: " + self.placemarkData.locality!
        case 7: elementText = "subAdministrativeArea: " + self.placemarkData.subAdministrativeArea!
        case 8: elementText = "administrativeArea: " + self.placemarkData.administrativeArea!
        case 9: elementText = "country: " + self.placemarkData.country!
        case 10: elementText = "isoCountryCode: " + self.placemarkData.isoCountryCode!
        default: print("Error: incorrect item number!")}
        newString = self.placemarkString + "\n" + elementText
    return newString
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        //ï£¿location prints one time and 'didUpdateLocations' is stopped:
    self.didUpdateLocationsCounter = self.didUpdateLocationsCounter + 1
    let labelString = String(describing: self.didUpdateLocationsCounter)
    self.LocationCounterLabel.text = "Location Update Counter: " + labelString
    if self.placemarkData == nil {
        //ï£¿location variable:
        self.requestCounter = self.requestCounter + 1
        let textString = String(describing: self.requestCounter)
        self.RequestCounterLabel.text = "Request Counter: " + textString
        if locations.count == 0 {
            self.LocationLabel.text = "Locations: There was NONE"}
        else {
            if locations.count > 0 {
                let coordinate2D: CLLocation = locations.first!
                let location = CLLocation(latitude: coordinate2D.coordinate.latitude, longitude: coordinate2D.coordinate.longitude)
                let printString = String(describing: location)
                self.LocationLabel.text = "Location: " + printString
                let geocoder: CLGeocoder = CLGeocoder()
                geocoder.reverseGeocodeLocation(location, completionHandler: {(placemarks, error) -> Void in
                    if error != nil {
                        let errorString = String(describing: error?.localizedDescription)
                        print("reverse geodcode fail: \(errorString)")
                        self.LocationCounterLabel.text = ""
                        self.RequestCounterLabel.text = ""
                        self.LocationLabel.text = "Reverse Geodcode fail: \(errorString)"
                        self.PlacemarkLabel.text = ""
                        self.requestingPlacemark = false
                        return}
                    else {
                        let pm = placemarks! as [CLPlacemark]
                        //ï£¿There is ALWAYS 'placemarks' Data
                        if pm.count > 0 {
                            self.placemarkData = placemarks![0]
                            self.printPlacemarkData = true
                            self.printPlacemarks()
                            self.requestingPlacemark = false}}})}
            else {
                if self.requestingPlacemark {
                    self.LocationLabel.text = "Problem: There is no 'location.first'"}}}}}}

然后是情节提要界面:

Storyboard Image

View Controller Image

<?xml version="1.0" encoding="UTF-8"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14460.31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
    <device id="retina4_7" orientation="portrait">
        <adaptation id="fullscreen"/>
    </device>
    <dependencies>
        <deployment identifier="iOS"/>
        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
    </dependencies>
    <scenes>
        <!--View Controller-->
        <scene sceneID="tne-QT-ifu">
            <objects>
                <viewController id="BYZ-38-t0r" customClass="ViewController" customModule="MyThoroughfare" customModuleProvider="target" sceneMemberID="viewController">
                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                        <subviews>
                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Location Counter" lineBreakMode="tailTruncation" numberOfLines="2" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="ZIg-u9-TMR">
                                <rect key="frame" x="16" y="20" width="343" height="20.5"/>
                                <color key="backgroundColor" red="0.80000001190000003" green="0.80000001190000003" blue="0.80000001190000003" alpha="1" colorSpace="calibratedRGB"/>
                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                <nil key="textColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Location Count Label" lineBreakMode="tailTruncation" numberOfLines="2" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="csF-KS-xGE">
                                <rect key="frame" x="16" y="48" width="343" height="20.5"/>
                                <color key="backgroundColor" red="0.80000001190000003" green="0.80000001190000003" blue="0.80000001190000003" alpha="1" colorSpace="calibratedRGB"/>
                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                <nil key="textColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Location String" lineBreakMode="tailTruncation" numberOfLines="8" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="qOc-gk-gSp">
                                <rect key="frame" x="16" y="76" width="343" height="20.5"/>
                                <color key="backgroundColor" red="0.80000001190000003" green="0.80000001190000003" blue="0.80000001190000003" alpha="1" colorSpace="calibratedRGB"/>
                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                <nil key="textColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Placemark String" lineBreakMode="tailTruncation" numberOfLines="14" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="42A-nO-tNf">
                                <rect key="frame" x="16" y="104" width="343" height="20.5"/>
                                <color key="backgroundColor" red="0.80000001190000003" green="0.80000001190000003" blue="0.80000001190000003" alpha="1" colorSpace="calibratedRGB"/>
                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                <nil key="textColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="HgN-oB-ds0">
                                <rect key="frame" x="121.5" y="578" width="132" height="30"/>
                                <state key="normal" title="Request Placemark"/>
                                <connections>
                                    <action selector="RefreshLocationButton:" destination="BYZ-38-t0r" eventType="touchUpInside" id="izY-S5-wjg"/>
                                </connections>
                            </button>
                        </subviews>
                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                        <constraints>
                            <constraint firstItem="ZIg-u9-TMR" firstAttribute="leading" secondItem="6Tk-OE-BBY" secondAttribute="leading" constant="16" id="6HO-kN-l1z"/>
                            <constraint firstItem="qOc-gk-gSp" firstAttribute="top" secondItem="csF-KS-xGE" secondAttribute="bottom" constant="7.5" id="6ux-dx-gJr"/>
                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="trailing" secondItem="42A-nO-tNf" secondAttribute="trailing" constant="16" id="8dG-gV-Cob"/>
                            <constraint firstItem="HgN-oB-ds0" firstAttribute="centerX" secondItem="8bC-Xf-vdC" secondAttribute="centerX" id="A38-Nt-i3D"/>
                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="trailing" secondItem="ZIg-u9-TMR" secondAttribute="trailing" constant="16" id="Bb0-YC-oov"/>
                            <constraint firstItem="csF-KS-xGE" firstAttribute="leading" secondItem="6Tk-OE-BBY" secondAttribute="leading" constant="16" id="FJU-ha-HkL"/>
                            <constraint firstItem="42A-nO-tNf" firstAttribute="top" secondItem="qOc-gk-gSp" secondAttribute="bottom" constant="7.5" id="SpR-XB-MLG"/>
                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="bottom" secondItem="HgN-oB-ds0" secondAttribute="bottom" constant="59" id="Vr6-QE-230"/>
                            <constraint firstItem="42A-nO-tNf" firstAttribute="leading" secondItem="6Tk-OE-BBY" secondAttribute="leading" constant="16" id="aHo-kJ-aCb"/>
                            <constraint firstItem="csF-KS-xGE" firstAttribute="top" secondItem="ZIg-u9-TMR" secondAttribute="bottom" constant="7.5" id="c63-Mq-ItW"/>
                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="trailing" secondItem="csF-KS-xGE" secondAttribute="trailing" constant="16" id="dlV-Hc-8XJ"/>
                            <constraint firstItem="qOc-gk-gSp" firstAttribute="leading" secondItem="6Tk-OE-BBY" secondAttribute="leading" constant="16" id="m5y-Q8-jxI"/>
                            <constraint firstItem="ZIg-u9-TMR" firstAttribute="top" secondItem="6Tk-OE-BBY" secondAttribute="top" id="sdw-WQ-Bx9"/>
                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="trailing" secondItem="qOc-gk-gSp" secondAttribute="trailing" constant="16" id="woB-ig-i5v"/>
                        </constraints>
                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
                    </view>
                    <connections>
                        <outlet property="LocationCounterLabel" destination="ZIg-u9-TMR" id="K4g-WT-f82"/>
                        <outlet property="LocationLabel" destination="qOc-gk-gSp" id="Cdw-bw-EWt"/>
                        <outlet property="PlacemarkLabel" destination="42A-nO-tNf" id="dMh-bw-cRE"/>
                        <outlet property="RequestCounterLabel" destination="csF-KS-xGE" id="ai6-zn-Toi"/>
                    </connections>
                </viewController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
            </objects>
            <point key="canvasLocation" x="53.600000000000001" y="66.11694152923539"/>
        </scene>
    </scenes>
</document>