利用GPS获取行车速度和距离

这几天项目中需要GPS计算汽车的速度和行驶距离，这里简单记录一下使用过程

• 1 和平常使用地图一样，在Info.plist中添加位置请求

• 2 在viewdidLoad中初始化locationManager

    _locationManager = [[CLLocationManager alloc]init];
    _locationManager.delegate = self;
    _locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    [_locationManager requestAlwaysAuthorization];
    [_locationManager startUpdatingLocation];
    [_locationManager location];
  

• 3 实现代理方法-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations

   if (_startingLocation == nil) {
   _startingLocation = (CLLocation *)[locations firstObject];
   }
   CLLocation *currentLocation = (CLLocation *)[locations lastObject];
   _speed = currentLocation.speed;
   _didtance = [currentLocation 	distanceFromLocation:_startingLocation ]; 
  

• 4 以上即可利用GPS获取行车速度和距离