Swift - 经纬度位置坐标与真实地理位置相互转化

原文出自：www.hangge.com  转载请保留原文链接：http://www.hangge.com/blog/cache/detail_785.html

通过CoreLocation类，得到的定位信息都是以经度和纬度等表示的地理信息，通过CLGeocoder类可以将其反编码成一个地址。反之，也可根据一个地址获取经纬度。

1，通过经纬度获取地址

import UIKit
import CoreLocation
import MapKit
 
class ViewController: UIViewController ,CLLocationManagerDelegate {
 
    @IBOutlet weak var textView: UITextView!
     
    override func viewDidLoad() {
        super.viewDidLoad()
 
        reverseGeocode()
    }
     
    //地理信息反编码
    func reverseGeocode(){
        var geocoder = CLGeocoder()
        var p:CLPlacemark?
        var currentLocation = CLLocation(latitude: 32.029171, longitude: 118.788231)
        geocoder.reverseGeocodeLocation(currentLocation, completionHandler: {
            (placemarks:[AnyObject]!, error:NSError!) -> Void in
            //强制转成简体中文
            var array = NSArray(object: "zh-hans")
            NSUserDefaults.standardUserDefaults().setObject(array, forKey: "AppleLanguages")
            //显示所有信息
            if error != nil {
                //println("错误：\(error.localizedDescription))")
                self.textView.text = "错误：\(error.localizedDescription))"
                return
            }
            let pm = placemarks as! [CLPlacemark]
            if pm.count > 0{
                p = placemarks[0] as? CLPlacemark
                //println(p) //输出反编码信息
                self.textView.text = p?.name
            } else {
                println("No placemarks!")
            }
        })
    }
 
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

2，通过地址获取经纬度

import UIKit
import CoreLocation
import MapKit
 
class ViewController: UIViewController ,CLLocationManagerDelegate {
 
    @IBOutlet weak var textView: UITextView!
     
    override func viewDidLoad() {
        super.viewDidLoad()
 
        locationEncode()
    }      
     
    //地理信息编码
    func locationEncode(){
        var geocoder = CLGeocoder()
        var p:CLPlacemark!
        geocoder.geocodeAddressString("南京市新街口大洋百货", completionHandler: {
            (placemarks:[AnyObject]!, error:NSError!) -> Void in
             
            if error != nil {
                self.textView.text = "错误：\(error.localizedDescription))"
                return
            }
            let pm = placemarks as! [CLPlacemark]
            if pm.count > 0{
                p = placemarks[0] as! CLPlacemark
                self.textView.text = "经度：\(p.location.coordinate.longitude)   "
                    + "纬度：\(p.location.coordinate.latitude)"
            } else {
                println("No placemarks!")
            }
        })
    }
 
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}