定位框一闪而过 iOS Swift

需求：获取经纬度。

方案：我自定义了一个类模块CLLocationModule.swift

备注以下代码里

let IS_IOS8 = (UIDevice.currentDevice().systemVersion as NSString).doubleValue >= 8.0

最开始的代码

import UIKit

import CoreLocation

class CLLocationModule: NSObject ,CLLocationManagerDelegate{

var latitude:Double?

var longitude:Double?

var city:NSString?

func GetLatitudeLongitudeAndCity(){

if CLLocationManager.locationServicesEnabled() == false {

print("此设备不能定位")

return

}

var locManager = CLLocationManager()

locManager.delegate = self

locManager.desiredAccuracy = kCLLocationAccuracyBest

locManager.distanceFilter = 1000.0

//设置定位权限仅ios8有意义

if IS_IOS8 {

locManager.requestWhenInUseAuthorization()// 前台定位

locManager.requestAlwaysAuthorization()

}

locManager.startUpdatingLocation()

}

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

for location in locations {

print("纬度：%g",location.coordinate.latitude);

print("经度：%g",location.coordinate.longitude);

latitude = location.coordinate.latitude

longitude = location.coordinate.longitude

self.saveLatitude(latitude!.description)

self.saveLongitude(longitude!.description)

let geocoder: CLGeocoder = CLGeocoder()

geocoder.reverseGeocodeLocation(location) { (placemarks, error) in

if error != nil {

print("reverse geodcode fail: \(error!.localizedDescription)")

return

}

let pm = placemarks! as [CLPlacemark]

if (pm.count > 0){

for placemark :CLPlacemark in placemarks! {

let placemarkDict = placemark.addressDictionary

let placemarkStr = placemarkDict!["State"]

self.city = placemarkStr?.substringToIndex((placemarkStr?.length)!-1)

self.saveCity(self.city!)

}

}else{

print("No Placemarks!")

}

}

}

manager.stopUpdatingLocation()

}

func locationManager(manager:CLLocationManager, didFailWithError error:NSError) {

print("locationManager error");

}

func saveLatitude(latitude: NSString) {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

defaults.setObject(latitude, forKey: "latitude")

defaults.synchronize()

}

func readLatitude() -> NSString {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

let latitude = defaults.objectForKey("latitude") as! NSString

return latitude;

}

func saveLongitude(longitude: NSString) {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

defaults.setObject(longitude, forKey: "longitude")

defaults.synchronize()

}

func readLongitude() -> NSString {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

let longitude = defaults.objectForKey("longitude") as! NSString

return longitude;

}

func saveCity(city: NSString) {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

defaults.setObject(city, forKey: "city")

defaults.synchronize()

}

func readCity() -> NSString {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

let city = defaults.objectForKey("city") as! NSString

return city;

}

}

外部调用是：

CLLocationModule().GetLatitudeLongitudeAndCity()

结果：定位框一闪而过 （允许 不允许那个弹出框） 导致不走代理方法didUpdateLocations 最后查阅网页 知道

（a）locManager没定义为全局变量

（b）自定义的CLLocationModule.swift这个类 由于ARC的缘故 自动释放了

针对以上（a）问题的解决办法为自定义类CLLocationModule.swift中将var locManager = CLLocationManager() 改为全局变量

var locManager: CLLocationManager!

locManager = CLLocationManager()

针对以上（b）问题的解决方案有两种

(1)外部调用时改为：(改为强引用)

var aCLLocationModule = CLLocationModule()

self.aCLLocationModule.GetLatitudeLongitudeAndCity()

(2)自定义的类CLLocationModule.swift改为单例

//单例

private static let aSharedInstance: CLLocationModule = CLLocationModule()

private override init() {}

class func sharedInstance() -> CLLocationModule {

return aSharedInstance

}

外部调用时改为：

CLLocationModule.sharedInstance().GetLatitudeLongitudeAndCity()

成功的代码附上两份

(1)单例

import UIKit

import CoreLocation

class CLLocationModule: NSObject ,CLLocationManagerDelegate{

//单例

private static let aSharedInstance: CLLocationModule = CLLocationModule()

private override init() {}

class func sharedInstance() -> CLLocationModule {

return aSharedInstance

}

var locManager: CLLocationManager!

var latitude:Double?

var longitude:Double?

var city:NSString?

func GetLatitudeLongitudeAndCity(){

if CLLocationManager.locationServicesEnabled() == false {

print("此设备不能定位")

return

}

locManager = CLLocationManager()

locManager.delegate = self

locManager.desiredAccuracy = kCLLocationAccuracyBest

locManager.distanceFilter = 1000.0

//设置定位权限仅ios8有意义

if IS_IOS8 {

locManager.requestWhenInUseAuthorization()// 前台定位

locManager.requestAlwaysAuthorization()

}

locManager.startUpdatingLocation()

}

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

for location in locations {

print("纬度：%g",location.coordinate.latitude);

print("经度：%g",location.coordinate.longitude);

latitude = location.coordinate.latitude

longitude = location.coordinate.longitude

self.saveLatitude(latitude!.description)

self.saveLongitude(longitude!.description)

let geocoder: CLGeocoder = CLGeocoder()

geocoder.reverseGeocodeLocation(location) { (placemarks, error) in

if error != nil {

print("reverse geodcode fail: \(error!.localizedDescription)")

return

}

let pm = placemarks! as [CLPlacemark]

if (pm.count > 0){

for placemark :CLPlacemark in placemarks! {

let placemarkDict = placemark.addressDictionary

let placemarkStr = placemarkDict!["State"]

self.city = placemarkStr?.substringToIndex((placemarkStr?.length)!-1)

self.saveCity(self.city!)

}

}else{

print("No Placemarks!")

}

}

}

manager.stopUpdatingLocation()

}

func locationManager(manager:CLLocationManager, didFailWithError error:NSError) {

print("locationManager error");

}

func saveLatitude(latitude: NSString) {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

defaults.setObject(latitude, forKey: "latitude")

defaults.synchronize()

}

func readLatitude() -> NSString {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

let latitude = defaults.objectForKey("latitude") as! NSString

return latitude;

}

func saveLongitude(longitude: NSString) {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

defaults.setObject(longitude, forKey: "longitude")

defaults.synchronize()

}

func readLongitude() -> NSString {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

let longitude = defaults.objectForKey("longitude") as! NSString

return longitude;

}

func saveCity(city: NSString) {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

defaults.setObject(city, forKey: "city")

defaults.synchronize()

}

func readCity() -> NSString {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

let city = defaults.objectForKey("city") as! NSString

return city;

}

}

外部调用：

CLLocationModule.sharedInstance().GetLatitudeLongitudeAndCity()

(2)强引用

import UIKit

import CoreLocation

class CLLocationModule: NSObject ,CLLocationManagerDelegate{

var locManager: CLLocationManager!

var latitude:Double?

var longitude:Double?

var city:NSString?

func GetLatitudeLongitudeAndCity(){

if CLLocationManager.locationServicesEnabled() == false {

print("此设备不能定位")

return

}

locManager = CLLocationManager()

locManager.delegate = self

locManager.desiredAccuracy = kCLLocationAccuracyBest

locManager.distanceFilter = 1000.0

//设置定位权限仅ios8有意义

if IS_IOS8 {

locManager.requestWhenInUseAuthorization()// 前台定位

locManager.requestAlwaysAuthorization()

}

locManager.startUpdatingLocation()

}

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

for location in locations {

print("纬度：%g",location.coordinate.latitude);

print("经度：%g",location.coordinate.longitude);

latitude = location.coordinate.latitude

longitude = location.coordinate.longitude

self.saveLatitude(latitude!.description)

self.saveLongitude(longitude!.description)

let geocoder: CLGeocoder = CLGeocoder()

geocoder.reverseGeocodeLocation(location) { (placemarks, error) in

if error != nil {

print("reverse geodcode fail: \(error!.localizedDescription)")

return

}

let pm = placemarks! as [CLPlacemark]

if (pm.count > 0){

for placemark :CLPlacemark in placemarks! {

let placemarkDict = placemark.addressDictionary

let placemarkStr = placemarkDict!["State"]

self.city = placemarkStr?.substringToIndex((placemarkStr?.length)!-1)

self.saveCity(self.city!)

}

}else{

print("No Placemarks!")

}

}

}

manager.stopUpdatingLocation()

}

func locationManager(manager:CLLocationManager, didFailWithError error:NSError) {

print("locationManager error");

}

func saveLatitude(latitude: NSString) {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

defaults.setObject(latitude, forKey: "latitude")

defaults.synchronize()

}

func readLatitude() -> NSString {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

let latitude = defaults.objectForKey("latitude") as! NSString

return latitude;

}

func saveLongitude(longitude: NSString) {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

defaults.setObject(longitude, forKey: "longitude")

defaults.synchronize()

}

func readLongitude() -> NSString {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

let longitude = defaults.objectForKey("longitude") as! NSString

return longitude;

}

func saveCity(city: NSString) {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

defaults.setObject(city, forKey: "city")

defaults.synchronize()

}

func readCity() -> NSString {

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

let city = defaults.objectForKey("city") as! NSString

return city;

}

}

外部调用：

var aCLLocationModule = CLLocationModule()

self.aCLLocationModule.GetLatitudeLongitudeAndCity()