我有一个包含数十个数据框和矩阵的大型class traceuserViewController: UIViewController,CLLocationManagerDelegate, MKMapViewDelegate {
var locationManager = CLLocationManager()
var startLocation: CLLocation?
var endLocation: CLLocation?
@IBOutlet weak var mapView: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
locationManager.delegate = self
self.locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
self.locationManager.distanceFilter = 30.0
self.locationManager.startMonitoringSignificantLocationChanges()
self.locationManager.startUpdatingLocation()
mapView.showsUserLocation = true
mapView.mapType = .hybrid
self.mapView.delegate = self
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
//user's current location
let nowlocation = locations.last
userLocations.append(nowlocation!)
print("HERE IS THE LOCATION ARRAY")
print(userLocations)
//show the current location region
let center = CLLocationCoordinate2D(latitude: nowlocation!.coordinate.latitude, longitude: nowlocation!.coordinate.longitude)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.7, longitudeDelta: 0.7))
self.mapView.setRegion(region, animated: true)
drawRoute(locationArray: userLocations)
}
func drawRoute(locationArray: [CLLocation]) {
if (locationArray.count) > 1 {
var destinationLocIndex = (locationArray.count) - 1
var startLocIndex = (locationArray.count) - 2
let destinationloc = locationArray[destinationLocIndex].coordinate
let startLoc = locationArray[startLocIndex].coordinate
var routeArray = [startLoc, destinationloc]
//test if the function works well or not
print(routeArray)
var geodesicLine = MKGeodesicPolyline(coordinates: routeArray , count: routeArray.count)
mapView.add(geodesicLine, level: .aboveRoads)
}
}
//draw in the mapview
private func mapView(mapView: MKMapView, rendererForOverlay overlay: MKOverlay) -> MKOverlayRenderer! {
if overlay is MKPolyline{
let polylineRenderer = MKPolylineRenderer(overlay: overlay)
polylineRenderer.strokeColor = UIColor.blue
polylineRenderer.lineWidth = 5.0
return polylineRenderer
}else{
os_log("Failed to draw the polyline", log: OSLog.default, type: .debug)
return nil
}
}
对象。我得到了这个对象并没有创建它。当我使用.RData加载数据时，数据框中充满了讨厌的因素。有没有一种简单的方法可以将所有这些数据框中的因素转换为load(data = myfile.Rdata)或character，类似于numeric与read_csv()的区别？使用每个数据框时运行read.csv()将无法进行转换。
这是一个最小例子的尝试：
tbl_df()