沿着上次更新的 GPS 坐标平滑移动和旋转 GMSMarker Swift iOS

Question

我正在使用 GMSMapView。因此，我添加了自定义 GMSMarker 并设置图像（例如自行车图像）并在用户开始移动并更改 locationManager 中标记的角度时为该标记设置动画。

目前我只是在更新 GMSMarker 的位置属性。 但是它给出了 GMSMarker 跳跃效果。 而不是这个我想移动和旋转 GMSMarker 平滑/正确进入 GMSMapView。

如何在 Swift 中实现这一点？谢谢。

   (void)updateLocationoordinates(CLLocationCoordinate2D) coordinates
    { 
     if (marker == nil) {
      marker = [GMSMarker markerWithPosition:coordinates];
      marker.icon = [UIImage imageNamed:IMAGE];
      marker.map = mapView;
    } else{
     marker.position = coordinates; 
          }
    }  

Answer 1

我也遇到过同样的问题并尝试了很多方法。最后我想出了一个解决方案——在以前的位置点和现在的位置点之间取角度，我使用了 UIImageView 而不是 GMSMarker。

//in location update method
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;
}


-(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;
}

将此用于动画：

[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5f];
sampleImgView.transform = CGAffineTransformMakeRotation(angle);
[sampleImgView setCenter:[myMapView.projection pointForCoordinate:CLLocationCoordinate2DMake(currLocation.coordinate.latitude, currLocation.coordinate.longitude)]];
[UIView commitAnimations];

这是示例 Imageview：

sampleImgView = [[UIImageView alloc]init];
sampleImgView.center = myMapView.center;
sampleImgView.frame = CGRectMake(0,0, 25, 50);
sampleImgView.backgroundColor = [UIColor clearColor];
[myMapView addSubview:sampleImgView];

希望这会有所帮助。