在Google地图目标-c中调整GMSCircle的大小，拖动和缩放

Question

Helllo Everyone，在谷歌地图中，​​我需要显示一个圆圈，用户可以调整大小，缩放它并拖动它，之后我需要找到圆的半径和中心经度和纬度。我怎样才能做到这一点？

Answer 1

对于Tappable GMSCircle set

didTapOverlay

要实现可拖动圈子，需要添加Google地图- (void)mapView: (GMSMapView*)mapView didChangeCameraPosition: (GMSCameraPosition*)position { //set GMSCameraPosition to googleMapCircle position googleMapCircle.position=position.target; } 的委托方法：

- (IBAction)sliderValueChnage:(id)sender {

  _slider = (UISlider*)sender;
    NSLog(@"slider value = %f", _slider.value);

    int radius=(int)_slider.value;
     _lblRadius.text=[NSString stringWithFormat:@"%d m",radius];


//For achieve circle radius increase or decrease properly ,first clear map view 
    [_googleMap clear];

//Set centre coordinate  where you want to draw circle
CLLocationCoordinate2D circleCenter = CLLocationCoordinate2DMake(_locationManager.location.coordinate.latitude, _locationManager.location.coordinate.longitude);

// Draw circle on google map
    GMSCircle *googleMapCircle = [GMSCircle circleWithPosition:circleCenter
                                             radius:_slider.value];
    googleMapCircle.fillColor = [[UIColor purpleColor] colorWithAlphaComponent:.4f];
    googleMapCircle.strokeColor = [UIColor purpleColor];
    googleMapCircle.strokeWidth = 5;
    googleMapCircle.tappable=YES;
    googleMapCircle.map = _googleMap;


}

netifaces

用于在滑块值更改时调整GMSCircle的大小 在滑块值更改方法中添加以下代码：

hostname