在Google地图目标-c中调整大小，拖动和缩放GMSCircle

问题描述

Helllo所有人，在谷歌地图中，​​我需要显示一个圆圈，用户可以调整它的大小，缩放并拖动它，之后我需要找到圆的半径和中心的经纬度。

解决方案

对于Tappable GMSCircle集合

  googleMapCircle.tappable = true; 
  

为了实现可拖动的圆圈，需要添加Google map的委托方法 didTapOverlay ：

   - （void）mapView：（GMSMapView *）mapView 
 didChangeCameraPosition :( GMSCameraPosition *）定位
 {
 //将GMSCameraPosition设置为googleMapCircle位置
 googleMapCircle.position = position.target; 
 
 
  

调整GMSCircle在滑块值上的大小更改
在滑块值更改方法中添加以下代码：

<$ p （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];


//为了实现圆圈半径的增加或减少，首先清除地图视图
[_googleMap clear];

//设置要绘制的中心坐标circle
CLLocationCoordinate2D circleCenter = CLLocationCoordinate2DMake（_locationManager.location.coordinate.latitude，_locationManager.location.coordinate.longitude）;

//在Google地图上绘制圆圈
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;


}

Helllo Everyone, In google map i need to show a circle and user can resize it, scale it and drag it also and after that i need to find radius of the circle and center latitude and longitude. How can i achieve this ?

解决方案

For Tappable GMSCircle set

googleMapCircle.tappable = true;

And to achieve draggable circle need to add the delegate method of Google map didTapOverlay :

- (void)mapView: (GMSMapView*)mapView
didChangeCameraPosition: (GMSCameraPosition*)position
{
   //set GMSCameraPosition to  googleMapCircle position
    googleMapCircle.position=position.target;

}

For resize GMSCircle on slider value changeAdd below code in slider value change method :

- (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;


}

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