在iOS8下使用CLLocationManager定位服务需要系统授权

最近在ios8.0使用CLLocationManager定位服务,发现老不能定位,查看设置菜单中的项也是处于未知状态.想起之前都有一个弹出框提示用户是否允许定位,这次一直没有出现了.原来ios8.0下的定位服务需要申请授权了. 具体代码如下:

 1 if ([CLLocationManager locationServicesEnabled]) {
 2 
 3   self.locationManager = [[CLLocationManager alloc] init];
 4 
 5   _locationManager.delegate = self;
 6 
 7   _locationManager.desiredAccuracy = kCLLocationAccuracyBest; //控制定位精度,越高耗电量越大。
 8 
 9   _locationManager.distanceFilter = 100; //控制定位服务更新频率。单位是“米”
10  
11   [_locationManager startUpdatingLocation];
12 
13    //在ios 8.0下要授权
14 
15    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
16 
17      [_locationManager requestWhenInUseAuthorization];  //调用了这句,就会弹出允许框了.
18 
19  }

注意:

在Info.plist文件还要加上NSLocationWhenInUseUsageDescription这个key,Value可以为空,

 1 #pragma mark - CLLocationManagerDelegate
 2 
 3 - (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
 4 
 5   
 6 
 7     CLLocation * currLocation = [locations lastObject];
 8 
 9  
10 
11     NSLog(@"%@",[NSString stringWithFormat:@"%.3f",currLocation.coordinate.latitude]);
12 
13     NSLog(@"%@",[NSString stringWithFormat:@"%.3f",currLocation.coordinate.longitude]);
14 
15 }