如何在iOS中的驾驶模式下移除Google地图上的以前的自定义标记
目前我正在工作一个像出租车的应用程序。
在这里，我在Google地图上添加了一些自定义标记（汽车图像）。 问题是在开车的时候我的车符号是不断的加上前面的标记，而且越过车的方向也没有显示出我前进的道路。
这是我的代码：
#pragma mark #pragma mark -- showUserCurrentLocationDetails -(void)showUserCurrentLocationDetails{ CLLocationCoordinate2D position =CLLocationCoordinate2DMake(LatValue,LongValue); GMSMarker *location = [GMSMarker markerWithPosition:position]; UIImage *markerIcon = [UIImage imageNamed:@"car-icon.png"]; markerIcon = [markerIcon imageWithAlignmentRectInsets:UIEdgeInsetsMake(0, 0, (markerIcon.size.height/2), 0)]; location.icon = markerIcon; CLLocationDegrees degrees = 90; location.rotation = degrees; location.groundAnchor = CGPointMake(0.5, 0.5); location.draggable = NO; location.map = mapViewRef; //To remove all markers simple do: //[mapViewRef clear]; } #pragma mark - startUserTracking -(void)startUserTracking{ // Listen to the myLocation property of GMSMapView. if (mapViewRef.observationInfo == nil){ [mapViewRef addObserver:self forKeyPath:@"myLocation" options:NSKeyValueObservingOptionNew context:NULL]; // Ask for My Location data after the map has already been added to the UI. dispatch_async(dispatch_get_main_queue(), ^{ mapViewRef.myLocationEnabled = YES; }); } } #pragma mark #pragma mark -- GMSMapViewDelegate - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{ CLLocation *location = [change objectForKey:NSKeyValueChangeNewKey]; mapViewRef.camera = [GMSCameraPosition cameraWithTarget:location.coordinate zoom:18]; LatValue = location.coordinate.latitude; LongValue = location.coordinate.longitude; driverLatitudeString = [[NSNumber numberWithFloat:LatValue] stringValue]; driverLongitudeString = [[NSNumber numberWithFloat:LongValue] stringValue]; //labelToShowCurrentRadiusValue.text = [NSString stringWithFormat:@"%f , %f", location.coordinate.latitude, location.coordinate.longitude]; // NSLog(@"Values are :: %f ,%f",LatValue,LongValue); [self sendDriverCurrentLocationDetailsToServer]; [self showUserCurrentLocationDetails]; } 你能帮我解决这个问题吗？ 链接在这里
在Objective-C中：将位置GMSMarker作为全局variables，并在获取新的位置坐标时更新其位置。
@interface YourViewController () { GMSMarker *marker; } - (void)viewDidLoad { [super viewDidLoad]; /*Your code here which includes map initialisation too.*/ // After map initialisation marker = [[GMSMarker alloc] init]; marker.position = CLLocationCoordinate2DMake(lat,lng); marker.title = @"Your location"; marker.appearAnimation = kGMSMarkerAnimationPop; marker.map = myMapView; } - (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations { currLocation = [locations firstObject]; marker.position = CLLocationCoordinate2DMake(currLocation.latitude,currLocation.longitude); }
对于旋转，我也面临同样的问题，因为它不像预期的旋转。 所以我用UIImageView代替了GMSMarker，更新了它的中心，并根据之前和当前位置坐标之间的angular度旋转它。
欲了解更多信息，请查看此链接
或者这里是所需的代码：
#import "SampleViewController.h" #import <CoreLocation/CoreLocation.h> #import <GoogleMaps/GoogleMaps.h> #import <QuartzCore/QuartzCore.h> #import <CoreMotion/CoreMotion.h> @interface SampleViewController ()<CLLocationManagerDelegate,GMSMapViewDelegate> { GMSMapView *myMapView; CLLocationCoordinate2D previousSourcePoint; CLLocation *prevCurrLocation, *currLocation; //sample UIImageView *sampleImgView; } @property CLLocationManager *locatnManager; @end @implementation SampleViewController - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self; } - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view from its nib. prevCurrLocation = [[CLLocation alloc]initWithLatitude:0.0 longitude:0.0]; //GMS MapView GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:23.2500 longitude:77.4170 zoom:14.0]; CGRect mapRect; //sample frames of mapview if ([UIScreen mainScreen].bounds.size.height==736)// iPhone 6 Plus 414*736 { mapRect = CGRectMake(0, 0, 414, 736-66); } else if ([UIScreen mainScreen].bounds.size.height==667)// iphone 6 375*667 { mapRect = CGRectMake(0, 0, 375, 667-66); } else if ([UIScreen mainScreen].bounds.size.height==568)// iphone 5, 5C, 5S 320*568 { mapRect = CGRectMake(0, 0, 320, 568-66); } else if ([UIScreen mainScreen].bounds.size.height==480) // iphone 4, 4S 320*480 { mapRect = CGRectMake(0, 0, 320, 480-66); } else{ mapRect = CGRectMake(60, 66, [UIScreen mainScreen].bounds.size.width + 100, [UIScreen mainScreen].bounds.size.height + 130); } myMapView = [GMSMapView mapWithFrame:mapRect camera:camera]; myMapView.myLocationEnabled = NO; myMapView.delegate = self; [myMapView.settings setAllGesturesEnabled:NO]; [myMapView.settings setZoomGestures:YES]; [myMapView.settings setScrollGestures:YES]; //Compass myMapView.settings.compassButton = YES; myMapView.padding = UIEdgeInsetsMake (40, 0, 0, 0); [myMapView setMinZoom:0.0 maxZoom:20.0]; for (id gestureRecognizer in myMapView.gestureRecognizers) { if (![gestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]]) { [myMapView removeGestureRecognizer:gestureRecognizer]; } if (![gestureRecognizer isKindOfClass:[UIRotationGestureRecognizer class]]) { [myMapView removeGestureRecognizer:gestureRecognizer]; } } [self.view addSubview:myMapView]; myMapView.frame = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height); previousSourcePoint = CLLocationCoordinate2DMake(0.0, 0.0); sampleImgView = [[UIImageView alloc]init]; sampleImgView.center = myMapView.center; sampleImgView.backgroundColor = [UIColor clearColor]; [myMapView addSubview:sampleImgView]; [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:0.8f]; sampleImgView.transform = CGAffineTransformMakeRotation(45); [UIView commitAnimations]; [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:0.3f]; sampleImgView.transform = CGAffineTransformMakeRotation(0); [UIView commitAnimations]; CGPoint ImgCenter = sampleImgView.center; CGRect frameRect = sampleImgView.frame; frameRect.size.width = 20.0f; frameRect.size.height = 30.0f; sampleImgView.image = [UIImage imageNamed:@"CAR"]; // place your own vehicle image sampleImgView.center = ImgCenter; sampleImgView.frame = frameRect; if ([CLLocationManager headingAvailable]) { [self locationManager]; } else { [[[UIAlertView alloc] initWithTitle:@"Error" message:@"Device doesn't support heading updates." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] show]; } } #pragma mark - above are test gms marker rotation -(void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; self.navigationController.navigationBarHidden = YES; myMapView.settings.zoomGestures = YES; } -(void)viewDidUnload{ [super viewDidUnload]; @try { [_locatnManager stopUpdatingLocation]; [self.locationManager stopUpdatingLocation]; } @catch (NSException *exception) { } @finally { //Display Alternative } } #pragma mark CLLocationManagerDelegate methods -(CLLocationManager *)locationManager { if (_locatnManager == nil) { _locatnManager = [[CLLocationManager alloc] init]; _locatnManager.desiredAccuracy = kCLLocationAccuracyBest; _locatnManager.delegate = self; // Check for iOS 8. Without this guard the code will crash with "unknown selector" on iOS 7. if ([_locatnManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) { [_locatnManager requestWhenInUseAuthorization]; } // Start the location updates if ([CLLocationManager locationServicesEnabled]) { _locatnManager.distanceFilter = kCLDistanceFilterNone; [_locatnManager startUpdatingLocation]; } } return _locatnManager; } - (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations { currLocation = [locations firstObject]; CGPoint anglepoint = [myMapView.projection pointForCoordinate:currLocation.coordinate]; CGFloat angle = [self getAngle:anglepoint]; if(!isnan(angle)){ [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:0.8f]; sampleImgView.transform = CGAffineTransformMakeRotation(angle); [sampleImgView setCenter:[myMapView.projection pointForCoordinate:CLLocationCoordinate2DMake(currLocation.coordinate.latitude, currLocation.coordinate.longitude)]]; [UIView commitAnimations]; prevCurrLocation = currLocation; } else{ [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:0.8f]; [sampleImgView setCenter:[myMapView.projection pointForCoordinate:CLLocationCoordinate2DMake(currLocation.coordinate.latitude, currLocation.coordinate.longitude)]]; [UIView commitAnimations]; prevCurrLocation = currLocation; } } - (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error { if ([error code] != kCLErrorLocationUnknown) { [self.locationManager stopUpdatingLocation]; self.locationManager.delegate = nil; } } -(CGFloat) getAngle: (CGPoint) touchedPoints { CGPoint previousLocationPoint = [myMapView.projection pointForCoordinate:prevCurrLocation.coordinate]; CGFloat x1 = previousLocationPoint.x; CGFloat y1 = previousLocationPoint.y; CGFloat x2 = touchedPoints.x; CGFloat y2 = touchedPoints.y; CGFloat x3 = x1; CGFloat y3 = y2; CGFloat oppSide = sqrtf(((x2-x3)*(x2-x3)) + ((y2-y3)*(y2-y3))); CGFloat adjSide = sqrtf(((x1-x3)*(x1-x3)) + ((y1-y3)*(y1-y3))); CGFloat angle = atanf(oppSide/adjSide); // Quadrant Identifiaction if(x2 < previousLocationPoint.x) { angle = 0-angle; } if(y2 > previousLocationPoint.y) { angle = M_PI/2 + (M_PI/2 -angle); } return angle; } - (void)mapView:(GMSMapView *)mapView didChangeCameraPosition:(GMSCameraPosition *)position{ [sampleImgView setCenter:[myMapView.projection pointForCoordinate:CLLocationCoordinate2DMake(currLocation.coordinate.latitude, currLocation.coordinate.longitude)]]; }
我是新来的迅速，但我已经设法得到所需的输出。
在Swift中：
import UIKit import GoogleMaps import Darwin var locManager = CLLocationManager() var prevCurrLocation = CLLocation() var currLocation = CLLocation() //sample var sampleImgView = UIImageView(); var previousSourcePoint = CLLocationCoordinate2D() let map = GMSMapView(frame: CGRect.zero ) let camera = GMSCameraPosition.camera(withLatitude: -33.86, longitude:151.20, zoom: 18) class ViewController: UIViewController, GMSMapViewDelegate, CLLocationManagerDelegate { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } override func loadView() { // Create a GMSCameraPosition that tells the map to display the prevCurrLocation = CLLocation.init(latitude: 0.0, longitude: 0.0) previousSourcePoint = CLLocationCoordinate2DMake(0.0, 0.0) map.delegate = self map.camera = camera self.view = map map.isMyLocationEnabled = true map.settings.myLocationButton = true locManager = CLLocationManager() locManager.delegate = self locManager.desiredAccuracy = kCLLocationAccuracyBest locManager.startUpdatingLocation() let image : UIImage = UIImage(named:"Bus")! sampleImgView = UIImageView(image: image) sampleImgView.center = map.center sampleImgView.backgroundColor = UIColor.clear map.addSubview(sampleImgView) UIView.beginAnimations(nil, context: nil) UIView.setAnimationDuration(0.3) sampleImgView.transform = CGAffineTransform(rotationAngle: 0) UIView.commitAnimations() let ImgCenter = CGPoint(x:sampleImgView.center.x, y:sampleImgView.center.y) var frameRect = CGRect(origin: CGPoint(x:sampleImgView.frame.origin.x, y:sampleImgView.frame.origin.y), size: CGSize(width: sampleImgView.frame.size.width, height: sampleImgView.frame.size.height)) frameRect.size.width = 20.0 frameRect.size.height = 30.0 sampleImgView.center = ImgCenter; sampleImgView.frame = frameRect; } /*Google Maps Delegate Methods*/ func mapView(mapView: GMSMapView, didTapInfoWindowOfMarker marker: GMSMarker) { print("infoWindowTapped") } func mapView(mapView: GMSMapView, didTapMarker marker: GMSMarker) -> Bool { print("markerTapped") return true } /*Location Manager Delegate*/ func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) { manager.stopUpdatingLocation() } func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) { let userLocation:CLLocation = locations[0] let long = userLocation.coordinate.longitude; let lat = userLocation.coordinate.latitude; currLocation = userLocation print("locations = \(lat) \(long)") let anglepoint = map.projection.point(for: currLocation.coordinate) let angle:CGFloat = getAngle(point: anglepoint) if(!angle.isNaN) { UIView.beginAnimations(nil, context: nil) UIView.setAnimationDuration(0.8) sampleImgView.transform = CGAffineTransform(rotationAngle: angle) sampleImgView.center = map.projection.point(for: currLocation.coordinate) UIView.commitAnimations() prevCurrLocation = currLocation } else{ UIView.beginAnimations(nil, context: nil) UIView.setAnimationDuration(0.8) sampleImgView.center = map.projection.point(for: currLocation.coordinate) UIView.commitAnimations() prevCurrLocation = currLocation } } func getAngle(point: CGPoint) -> CGFloat { let previousLocationPoint = map.projection.point(for: prevCurrLocation.coordinate) let x1:Float = Float(previousLocationPoint.x) let y1:Float = Float(previousLocationPoint.y) let x2:Float = Float(point.x) let y2:Float = Float(point.y) let x3 = Float(x1) let y3 = Float(y2) let v1 = (x2-x3)*(x2-x3) let v2 = (y2-y3)*(y2-y3) let v3 = (x1-x3)*(x1-x3) let v4 = (y1-y3)*(y1-y3) let oppSide = sqrtf(v1 + v2) let adjSide = sqrtf(v3 + v4) var angle = atanf(oppSide/adjSide); // Quadrant Identifiaction if(x2 < Float(previousLocationPoint.x)) { angle = 0-angle; } if(y2 > Float(previousLocationPoint.y)) { angle = Float(M_PI)/2 + (Float(M_PI)/2 - angle); } return CGFloat(angle) } func mapView(mapView: GMSMapView, didChangeCameraPosition position: GMSCameraPosition) { sampleImgView.center = map.projection.point(for: currLocation.coordinate) }
希望这可以帮助。