繼之前的后臺播放音頻，后臺下載，再來一發后臺持續定位的實現。流程差不多：
1.開去后臺模式：

后臺模式勾選

2.在plist中加入NSLocationAlwaysUsageDescription這個鍵，對應的值為Boolean型，YES （總是使用定位）。
并在程序中加入如下代碼,獲取持續定位的許可。
<pre>if([_manager respondsToSelector:@selector(requestAlwaysAuthorization)])
{
[_manager requestAlwaysAuthorization];
}</pre>
其中的manager是CLLocationManager對象。

3.在applicationDidEnterBackground：方法中，加入如下代碼：
<pre>- (void)applicationDidEnterBackground:(UIApplication )application {
if([CLLocationManager significantLocationChangeMonitoringAvailable])
{
ViewControllervc=(ViewController *)self.window.rootViewController;
[vc.manager stopUpdatingLocation];
[vc.manager startMonitoringSignificantLocationChanges];
}
else
{
NSLog(@"significant Location Change not Available");
}
}</pre>
4.在applicationDidBecomeActive:方法中，加入如下代碼：
<pre>

• (void)applicationDidBecomeActive:(UIApplication )application {
  if([CLLocationManager significantLocationChangeMonitoringAvailable])
  {
  ViewControllervc=(ViewController *)self.window.rootViewController;

    [vc.manager stopMonitoringSignificantLocationChanges];
    [vc.manager startUpdatingLocation];
  

  }
  else
  {
  NSLog(@"significant Location Change not Available");
  }
  }</pre>

5.至此，后臺持續定位功能成功實現。最后附上部分代碼，供參考：
AppDelegate.m
<pre>

import "AppDelegate.h"

import <CoreLocation/CoreLocation.h>

import "ViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

• (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  self.window.rootViewController=[ViewController new];
  return YES;
  }

• (void)applicationDidEnterBackground:(UIApplication )application {
  if([CLLocationManager significantLocationChangeMonitoringAvailable])
  {
  ViewControllervc=(ViewController *)self.window.rootViewController;
  [vc.manager stopUpdatingLocation];
  [vc.manager startMonitoringSignificantLocationChanges];
  }
  else
  {
  NSLog(@"significant Location Change not Available");
  }
  }

• (void)applicationDidBecomeActive:(UIApplication )application {
  if([CLLocationManager significantLocationChangeMonitoringAvailable])
  {
  ViewControllervc=(ViewController *)self.window.rootViewController;

    [vc.manager stopMonitoringSignificantLocationChanges];
    [vc.manager startUpdatingLocation];
  

  }
  else
  {
  NSLog(@"significant Location Change not Available");
  }
  }

@end
</pre>
ViewController.h
<pre>

import <UIKit/UIKit.h>

import <CoreLocation/CoreLocation.h>

@interface ViewController : UIViewController<CLLocationManagerDelegate>

//定位管理對象
@property(nonatomic,strong)CLLocationManager *manager;

@end
</pre>
ViewController.m
<pre>

import "ViewController.h"

import <Photos/Photos.h>

import <CoreLocation/CoreLocation.h>

@interface ViewController ()<CLLocationManagerDelegate>
{
// 定位管理對象
CLLocationManager *_manager;
CLGeocoder *_coder;
// 存儲上一次的位置
}
@end

@implementation ViewController

• (void)viewDidLoad
  {
  [super viewDidLoad];
  PHFetchResult *result=[PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
  for(PHAssetCollection *collection in result)
  {
  if ([collection.localizedTitle isEqualToString:@"FGG"]) {
  NSLog(@"%@",collection);
  }
  }

  //1.創建定位管理對象
  _manager=[[CLLocationManager alloc]init];
  _coder=[[CLGeocoder alloc]init];
  //2.設置屬性 distanceFilter、desiredAccuracy
  _manager.distanceFilter=kCLDistanceFilterNone;//實時更新定位位置
  _manager.desiredAccuracy=kCLLocationAccuracyBest;//定位精確度

  //iOS8之后需要設置Info.plist，NSLocationAlwaysUsageDescription=YES以開啟總是使用定位
  if([_manager respondsToSelector:@selector(requestAlwaysAuthorization)])
  {
  [_manager requestAlwaysAuthorization];
  }
  //該模式是抵抗程序在后臺被殺，申明不能夠被暫停
  _manager.pausesLocationUpdatesAutomatically=NO;
  //3.設置代理
  _manager.delegate=self;
  //4.開始定位
  [_manager startUpdatingLocation];
  //5.獲取朝向
  [_manager startUpdatingHeading];

}

pragma mark-CLLocationManager代理方法

//定位失敗時調用的方法
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(@"%@",error);
}
//定位成功調用的的方法
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
if(locations.count>0)
{
//獲取位置信息
CLLocation *loc=[locations lastObject];
//海拔
CGFloat altitute=loc.altitude;
CGFloat altituteAcuracy=loc.verticalAccuracy;

    NSLog(@"海拔高度：%.0fm 精度：%.0fm",altitute,altituteAcuracy);
    //獲取經緯度的結構體
    CLLocationCoordinate2D coor=loc.coordinate;
    
    CLLocation *location=[[CLLocation alloc]initWithLatitude:coor.latitude longitude:coor.longitude];
    
    [_coder reverseGeocodeLocation:location completionHandler:^(NSArray *placemarks, NSError *error) {
        CLPlacemark *pmark=[placemarks firstObject];
        NSLog(@"%@",pmark.addressDictionary);
        NSString *city=pmark.addressDictionary[@"City"];
        if([city hasSuffix:@"市轄區"])
            city=[city substringToIndex:city.length-3];
        if([city hasSuffix:@"市"])
            city=[city substringToIndex:city.length-1];
        NSLog(@"%@",city);
    }];
}

}
//返回定位的朝向
-(void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading
{
// 相對地理北極的方向
// newHeading.trueHeading;
// 相對地磁北極的方向
// newHeading.magneticHeading;
}

@end
</pre>