利用GPS獲取行車速度和距離

這幾天項目中需要GPS計算汽車的速度和行駛距離，這里簡單記錄一下使用過程

• 1 和平常使用地圖一樣，在Info.plist中添加位置請求

• 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 實現代理方法-(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獲取行車速度和距離