沿用户面向的方向旋转 GMSMarker

Question

我有一个要求，比如我当前的位置将显示一个视图。如果设备旋转或位置将改变，它将旋转。我研究了很多，但得到了所有在某个位置具有固定位置或角度但我没有固定位置的代码。谁能带我往正确的方向前进。

我还使用了 GMSMarker 的 rotation 属性，但它不起作用。

- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading
{
    if (newHeading.headingAccuracy < 0){
        NSLog(@"heading accuracy < 0");
        return;
    }

    // Convert Degree to Radian and move the needle
    float oldRad =  (- manager.heading.trueHeading) * M_PI / 180.0f;
    float newRad =  (- newHeading.trueHeading) * M_PI / 180.0f;

    // Compass animation
    CABasicAnimation *theAnimation;
    theAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
    theAnimation.fromValue = [NSNumber numberWithFloat:oldRad];
    theAnimation.toValue   = [NSNumber numberWithFloat:newRad];
    theAnimation.duration  = 0.5f;
    [source.layer addAnimation:theAnimation forKey:@"animateMyRotation"];

//    source.transform =  CGAffineTransformMakeRotation(newRad)
//    GMSMarker *source = [googleMap selectedMarker];
//    source.rotation = newRad;
}

更新：我有旋转方法，但有什么方法可以旋转 GMSMarker，因为没有变换方法。

优步如何在谷歌地图中旋转他们的汽车？

Answer 1

当前位置“CLLocation”对象有一个名为“course”的属性

@property(readonly, nonatomic) CLLocationDirection course;

类型为 CLLocationDirection(typedef of double)，它是位置的角度。

为了让汽车旋转，您需要在后端、方向以及纬度和经度中添加额外的字段。使用此信息通过在 UIView 上应用 Transform 来旋转汽车

CGAffineTransformMakeRotation(M_PI * (course_of_location) / 180.0);

Answer 2

你可以做类似的事情 -

-(void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading {

    CLLocationDirection direction = newHeading.trueHeading;
    lastDriverAngleFromNorth = direction;
    self.driverMarker.rotation = lastDriverAngleFromNorth - mapBearing;
}

#pragma mark - GMSMapViewDelegate

- (void)mapView:(GMSMapView *)mapView didChangeCameraPosition:(GMSCameraPosition *)position {

    mapBearing = position.bearing;
    self.driverMarker.rotation = lastDriverAngleFromNorth - mapBearing;
}

Answer 3

marker.rotation = course_of_location;

注意：旋转到销只会在移动过程中发生。如果是静态设备，location.course 的值为 -1。这也与设备方向无关。如果您想根据设备标题移动图钉，请执行此操作

- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading {
marker.rotation =  (manager.heading.trueHeading) * M_PI / 180.0f; }

Answer 4

//只做这个

- (void)locationManager:(CLLocationManager *)manager  didUpdateHeading:(CLHeading *)newHeading
{
   double heading = newHeading.trueHeading;
   marker.groundAnchor = CGPointMake(0.5, 0.5);
   marker.rotation = heading;
   marker.map = mapView;
}

Answer 5

我们可以根据课程属性CLLocation Class来旋转图片

    let marker = GMSMarker(position: currentLocation!)
    let head = locationManager.location?.course ?? 0
    marker.rotation = head
    marker.icon = UIImage(named: "testyCar.png")
    marker.map = mapView 

Answer 6

试试这个，它对我有用

func locationManager(_ manager: CLLocationManager, didUpdateHeading newHeading:CLHeading) {
    UIView.animate(withDuration: 0.005) {
       let angle = newHeading.trueHeading.toRadians() // convert from degrees to radians
       self.yourImageHere.transform = CGAffineTransform(rotationAngle: CGFloat(angle)) // rotate the picture
    }
}
override func viewDidLoad() {
   super.viewDidLoad()
   locationManager.startUpdatingHeading()
}

Answer 7

这里是使用 Oren Trutner 和我建议的更改修改的代码：

您只需要传递旧位置和新位置。通过传递所需的数据，您将获得浮动值。

#define degreesToRadians(x) (M_PI * x / 180.0)
#define radiansToDegrees(x) (x * 180.0 / M_PI)

- (float)getHeadingForDirectionFromCoordinate:(CLLocationCoordinate2D)fromLoc toCoordinate:(CLLocationCoordinate2D)toLoc
{
    float fLat = degreesToRadians(fromLoc.latitude);
    float fLng = degreesToRadians(fromLoc.longitude);
    float tLat = degreesToRadians(toLoc.latitude);
    float tLng = degreesToRadians(toLoc.longitude);

    float degree = radiansToDegrees(atan2(sin(tLng-fLng)*cos(tLat), cos(fLat)*sin(tLat)-sin(fLat)*cos(tLat)*cos(tLng-fLng)));

    if (degree >= 0) {
        return degree;
    } else {
        return 360+degree;
    }
}

Answer 8

Swift 4+

感谢priya.vr。当你更新位置标记时，试试这个：

 let locationManager = CLLocationManager()
 marker.position = position
 marker.appearAnimation = .none
 marker.rotation = locationManager.location?.course ?? 0
 marker.map = map