开启定位服务

开启定位步骤

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第一步： 开启后台模式,选中定位选择project –> capabilities–>Backgorund Modes –> Location updates 如图：

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第二步： 在info.list 文件中添加如下配置：(添加定位权限，ios8之后需要添加，否则无法定位)

<key>NSLocationWhenInUseUsageDescription</key>   
<string>YES</string>    
<key>NSLocationAlwaysUsageDescription</key>        
<string>YES</string>

第三步：Appdelegate中代码1.引入头文件，定义全局变量

#import<CoreLocation/CoreLocation.h> 
@interface AppDelegate () {            
    CLLocationManager * _locationManager; 
}
 @end

2.didFinishLaunchingWithOptions中进行初始化(调用初始化方法)，初始化方法如下：

-(void) createLocationManager{ 
      _locationManager = [[CLLocationManager alloc] init]; 
  if ([_locationManager  respondsToSelector:@selector(requestAlwaysAuthorization)]) {       
      [_locationManager requestAlwaysAuthorization]; 
  }
 if ([_locationManager   respondsToSelector:@selector(setAllowsBackgroundLocationUpdates:)]) {     
      [_locationManager setAllowsBackgroundLocationUpdates:YES];
 }
   _locationManager.pausesLocationUpdatesAutomatically = NO; 
}

3.在applicationDidEnterBackground（进入后台）方法中执行启动定位服务
- (void)applicationDidEnterBackground:(UIApplication *)application {
[_locationManager startUpdatingLocation];
}