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更新时间:2021-09-20
绘制线简介

折线类为 BMKPolyline,由一组经纬度坐标组成,并以有序序列形式建立一系列的线段。
注意:V5.0.0后的版本,绘制线宽会变细,lineWidth统一为画笔宽度,请注意适配

绘制折线
1创建BMKMapView,并设置delegate
Objective-C
Swift
BMKMapView *mapView = [[BMKMapView alloc]initWithFrame:self.view.bounds];
mapView.delegate = self;
[self.view addSubView:mapView];
class ViewController: UIViewController, BMKMapViewDelegate {
    var mapView: BMKMapView?
    override func viewDidLoad() {
        super.viewDidLoad()
        mapView = BMKMapView(frame: self.view.frame)
        mapView?.delegate = self
        self.view.addSubview(mapView!);
    }
}
2添加折线覆盖物数据
Objective-C
Swift
// 添加折线覆盖物
CLLocationCoordinate2D coords[5] = {0};
coords[0] = CLLocationCoordinate2DMake(39.968, 116.260);
coords[1] = CLLocationCoordinate2DMake(39.912, 116.324);
coords[2] = CLLocationCoordinate2DMake(39.968, 116.373);
coords[3] = CLLocationCoordinate2DMake(39.912, 116.439);
coords[4] = CLLocationCoordinate2DMake(39.968, 116.490);
BMKPolyline *polyline = [BMKPolyline polylineWithCoordinates:coors count:5];
[_mapView addOverlay:polyline];
var coords = [CLLocationCoordinate2D]()
coords.append(CLLocationCoordinate2D(latitude: 39.968, longitude: 116.260))
coords.append(CLLocationCoordinate2D(latitude: 39.912, longitude: 116.324))
coords.append(CLLocationCoordinate2D(latitude: 39.968, longitude: 116.373))
coords.append(CLLocationCoordinate2D(latitude: 39.912, longitude: 116.439))
coords.append(CLLocationCoordinate2D(latitude: 39.968, longitude: 116.490))
/**
 *根据指定坐标点生成一段折线
 *@param coords 指定的经纬度坐标点数组
 *@param count 坐标点的个数
 *@return 新生成的折线对象
 */
let polyline: BMKPolyline = BMKPolyline(coordinates: &coords, count: 5)
mapView?.add(polyline)
3实现代理方法
Objective-C
Swift
- (BMKOverlayView *)mapView:(BMKMapView *)mapView viewForOverlay:(id <BMKOverlay>)overlay{
    if ([overlay isKindOfClass:[BMKPolyline class]]){
         BMKPolylineView *polylineView = [[BMKPolylineView alloc] initWithPolyline:overlay];
         //设置polylineView的画笔颜色为蓝色
         polylineView.strokeColor = [[UIColor alloc] initWithRed:19/255.0 green:107/255.0 blue:251/255.0 alpha:1.0];
         //设置polylineView的画笔宽度为16
         polylineView.lineWidth = 16;
         //圆点虚线,V5.0.0新增
//        polylineView.lineDashType = kBMKLineDashTypeDot;
         //方块虚线,V5.0.0新增
//       polylineView.lineDashType = kBMKLineDashTypeSquare;
         return polylineView;
    }
    return nil;
}
//MARK:BMKMapViewDelegate
/**
 根据overlay生成对应的BMKOverlayView
 
 @param mapView 地图View
 @param overlay 指定的overlay
 @return 生成的覆盖物View
 */
func mapView(_ mapView: BMKMapView!, viewFor overlay: BMKOverlay!) -> BMKOverlayView! {
    if overlay.isKind(of: BMKPolyline.self) {
        //初始化一个overlay并返回相应的BMKPolylineView的实例
        let polylineView = BMKPolylineView(polyline: overlay as? BMKPolyline)
        if overlay.isEqual(polyline) {
            //设置polylineView的画笔颜色为蓝色
            polylineView?.strokeColor = UIColor(red: 19 / 255.0, green: 107/255.0, blue: 251/255.0, alpha: 1.0)
            //设置polylineView的画笔宽度为16
            polylineView?.lineWidth = 16
            //圆点虚线,V5.0.0新增
            //polylineView?.lineDashType = kBMKLineDashTypeDot
            //方块虚线,V5.0.0新增
            //polylineView?.lineDashType = kBMKLineDashTypeSquare
            
        }
        return polylineView
    }
    return nil
}
4运行程序

效果如图:

newIos%2Fpolyline1v5.png newIos%2Fpolyline2v5.png

绘制大地曲线

iOS地图SDK支持大地曲线绘制能力。

1添加大地曲线数据
Objective-C
Swift
CLLocationCoordinate2D coords[2] = {0};
        coords[1] = CLLocationCoordinate2DMake(36.53, -121.47);
        coords[0] = CLLocationCoordinate2DMake(22.33, 114);
        BMKGeodesicLine *geodesicLine = [BMKGeodesicLine geodesicLineWithCoordinates:coords count:2];
        // 若经度跨180,则须设置lineDirectionCross180参数
        _geodesicLine.lineDirectionCross180 = kBMKLineDirectionCross180TypeWEST_TO_EAST;   
 [_mapView addOverlay:geodesicLine];
 var coords = [CLLocationCoordinate2D]()
        coords.append(CLLocationCoordinate2DMake(22.33, 114))
        coords.append(CLLocationCoordinate2DMake(36.53, -121.47))
        
        let geodesicLine: BMKGeodesicLine = BMKGeodesicLine(coordinates: &coords, count: 2)
        // 若经度跨180,则须设置lineDirectionCross180参数
        geodesicLine.lineDirectionCross180 = kBMKLineDirectionCross180TypeWEST_TO_EAST;        mapView.add(geodesicLine)
2实现代理方法,并设置颜色或者纹理图片
Objective-C
Swift
- (BMKOverlayView *)mapView:(BMKMapView *)mapView viewForOverlay:(id<BMKOverlay>)overlay {
    if ([overlay isKindOfClass:[BMKGeodesicLine class]]) {
        BMKGeodesicLineView *geodesicView = [[BMKGeodesicLineView alloc] initWithGeodesicLine:overlay];
        geodesicView.strokeColor = [UIColor colorWithRed:0 green:0 blue:1 alpha:1];
        geodesicView.lineWidth = 6;
        geodesicView.lineDashType = kBMKLineDashTypeDot;
        return geodesicView;
    }
    return nil;
}

func mapView(_ mapView: BMKMapView!, viewFor overlay: BMKOverlay!) -> BMKOverlayView! {
        if overlay.isKind(of: BMKGeodesicLine.self) {
            if overlay.isEqual(geodesicLine) {
                let geodesicLineView = BMKGeodesicLineView(geodesicLine: geodesicLine)
                geodesicLineView.strokeColor = UIColor.blue
                geodesicLineView.lineWidth = 6.0
//                geodesicLineView.lineDashType = kBMKLineDashTypeDot
                return  geodesicLineView
            }
        }
        return nil
    }
3运行程序
效果如图:

ios_ployline_2.png

绘制渐变线

iOS地图SDK支持渐变线绘制能力。

1添加渐变线数据,并构建分段渐变颜色索引数组
Objective-C
Swift
 CLLocationCoordinate2D coords[5] = {0};
        coords[0] = CLLocationCoordinate2DMake(39.965, 116.404); 
        coords[1] = CLLocationCoordinate2DMake(39.925, 116.454); 
        coords[2] = CLLocationCoordinate2DMake(39.955, 116.494); 
        coords[3] = CLLocationCoordinate2DMake(39.905, 116.554); 
        coords[4] = CLLocationCoordinate2DMake(39.965, 116.604);
        // 构建分段渐变颜色索引数组
        NSArray *drawIndexs = [NSArray arrayWithObjects:
                                [NSNumber numberWithInt:0],
                                [NSNumber numberWithInt:1],
                                [NSNumber numberWithInt:2],
                                [NSNumber numberWithInt:3], nil];
        
BMKGradientLine *gradientLine = [BMKGradientLine gradientLineWithCoordinates:coords count:5 drawIndexs:drawIndexs]; [_mapView addOverlay:gradientLine];
  var coords = [CLLocationCoordinate2D]()
        coords.append(CLLocationCoordinate2D(latitude: 39.965, longitude: 116.404))
        coords.append(CLLocationCoordinate2D(latitude: 39.925, longitude: 116.454))
        coords.append(CLLocationCoordinate2D(latitude: 39.955, longitude: 116.494))
        coords.append(CLLocationCoordinate2D(latitude: 39.905, longitude: 116.554))
        coords.append(CLLocationCoordinate2D(latitude: 39.965, longitude: 116.604))
              
        // 构建分段渐变颜色索引数组
        let drawIndexs = [0, 1, 2, 3]
        
        let gradientLine: BMKGradientLine = BMKGradientLine(coordinates: &coords, count: 5, drawIndexs: drawIndexs as [NSNumber])
mapView.add(gradientLine)

2实现代理方法,并设置渐变颜色数组
Objective-C
Swift
- (__kindof BMKOverlayView *)mapView:(BMKMapView *)mapView viewForOverlay:(id<BMKOverlay>)overlay {
        if ([overlay isKindOfClass:[BMKGradientLine class]]) { 
          // 初始化一个overlay并返回相应的BMKGradientLineView的实例
          BMKGradientLineView *gradientLineView = [[BMKGradientLineView alloc] initWithGradientLine:overlay];
          // 渐变线颜色数组
          gradientLineView.strokeColors = [NSArray arrayWithObjects:
                                    [[UIColor alloc] initWithRed:1 green:0 blue:0 alpha:1], 
                                    [[UIColor alloc] initWithRed:1 green:1 blue:0 alpha:0.5],
                                    [[UIColor alloc] initWithRed:0 green:0 blue:1 alpha:1],
                                    [[UIColor alloc] initWithRed:0 green:1 blue:0 alpha:1],
                                    nil];
          // 画笔宽度为12
          gradientLineView.lineWidth = 12; 
          return gradientLineView; 
}  
return nil;
} 
func mapView(_ mapView: BMKMapView!, viewFor overlay: BMKOverlay!) func mapView(_ mapView: BMKMapView!, viewFor overlay: BMKOverlay!) -> BMKOverlayView! {
        if overlay.isKind(of: BMKGradientLine.self) { 
          // 初始化一个overlay并返回相应的BMKGradientLineView的实例 
          let gradientLineView = BMKGradientLineView(gradientLine: gradientLine)
          // 画笔宽度为12
          gradientLineView.lineWidth = 12.0
          // 渐变线颜色数组
          gradientLineView.colors = [UIColor.init(red: 0, green: 1, blue: 0, alpha: 1),
                                    UIColor.init(red: 1, green: 0, blue: 0, alpha: 1),
                                    UIColor.init(red: 1, green: 1, blue: 0, alpha: 0.5),
                                    UIColor.init(red: 0, green: 0, blue: 1, alpha: 1),
                                    UIColor.init(red: 0, green: 1, blue: 0, alpha: 1)]
          
          return  gradientLineView
}
return nil
}  

3运行程序
效果如图:

ios_ployline_5.png

分段颜色绘制折线

iOS地图SDK支持折线多段颜色绘制能力。

1添加分段折线数据,并构建分段颜色索引数组
Objective-C
Swift
CLLocationCoordinate2D coords[5] = {0};
coords[0] = CLLocationCoordinate2DMake(39.968, 116.260);
coords[1] = CLLocationCoordinate2DMake(39.912, 116.324);
coords[2] = CLLocationCoordinate2DMake(39.968, 116.373);
coords[3] = CLLocationCoordinate2DMake(39.912, 116.439);
coords[4] = CLLocationCoordinate2DMake(39.968, 116.490);
//构建分段颜色索引数组
NSArray *drawIndexs = [NSArray arrayWithObjects: 
                                [NSNumber numberWithInt:0],
                                [NSNumber numberWithInt:1],
                                [NSNumber numberWithInt:2],
                                [NSNumber numberWithInt:3], nil];
// 构造分段折线
colorfulPolyline = [BMKMultiPolyline multiPolylineWithCoordinates:coords count:5 drawIndexs:colorIndexs];
[_mapView addOverlay:colorfulPolyline];
var coords = [CLLocationCoordinate2D]()
coords.append(CLLocationCoordinate2D(latitude: 39.968, longitude: 116.260)) 
coords.append(CLLocationCoordinate2D(latitude: 39.912, longitude: 116.324))
coords.append(CLLocationCoordinate2D(latitude: 39.968, longitude: 116.373)) 
coords.append(CLLocationCoordinate2D(latitude: 39.912, longitude: 116.439)) 
coords.append(CLLocationCoordinate2D(latitude: 39.968, longitude: 116.490))
//构建分段纹理索引数组
let drawIndexs = [0, 1, 2, 3]
// 构造分段折线
let colorfulPolyline: BMKMultiPolyline = BMKMultiPolyline(coordinates: &coords, count: 5, drawIndexs: drawIndexs as [NSNumber])
mapView?.add(polyline)
2实现代理方法,并设置分段颜色
Objective-C
Swift
//根据overlay生成对应的View
- (__kindof BMKOverlayView *)mapView:(BMKMapView *)mapView viewForOverlay:(id <BMKOverlay>)overlay { 
    if ([overlay isKindOfClass:[BMKMultiPolyline class]]){ 
           BMKMultiColorPolylineView *colorfulPolylineView = [[BMKMultiColorPolylineView alloc] initWithMultiPolyline:overlay];
           // 设置polylineView的画笔宽度为12
           colorfulPolylineView.lineWidth = 12;
           colorfulPolylineView.colors = [NSArray arrayWithObjects:
                                     [[UIColor alloc] initWithRed:246/255.0 green:57/255.0 blue:57/255.0 alpha:1.0], 
                                     [[UIColor alloc] initWithRed:253/255.0 green:173/255.0 blue:42/255.0 alpha:1.0], 
                                     [[UIColor alloc] initWithRed:28/255.0 green:188/255.0 blue:82/255.0 alpha:1.0], 
                                     [[UIColor alloc] initWithRed:19/255.0 green:107/255.0 blue:251/255.0 alpha:1.0], 
                                          nil];
           // 设置头尾处圆帽样式,V5.0.0新增
           colorfulPolylineView.lineCapType = kBMKLineCapRound; 
          return colorfulPolylineView;
    } 

    return nil; 
      
}
//MARK:BMKMapViewDelegate
/**
 根据overlay生成对应的BMKOverlayView
 
 */
 func mapView(_ mapView: BMKMapView, viewFor overlay: BMKOverlay) -> BMKOverlayView? { 
      if overlay.isKind(of: BMKMultiPolyline.self) { 
           let colorfulPolylineView = BMKMultiColorPolylineView(multiPolyline: overlay as! BMKMultiPolyline) 
           // 设置colorfulPolylineView的画笔宽度为12 
           colorfulPolylineView?.lineWidth = 12.0 
           colorfulPolylineView?.strokeColors = [UIColor.init(red: 0, green: 1, blue: 0, alpha: 1),
                                                 UIColor.init(red: 1, green: 0, blue: 0, alpha: 1), 
                                                 UIColor.init(red: 1, green: 1, blue: 0, alpha: 0.5), 
                                                 UIColor.init(red: 0, green: 0, blue: 1, alpha: 1)] 
           // lineCapType,默认是kBMKLineCapButt (不支持虚线) 
           colorfulPolylineView?.lineCapType = kBMKLineCapRound 
           return colorfulPolylineView 
 }   
 return nil 
}
3运行程序

newIos%2Fpolyline3v5.png

分段纹理折线

iOS地图SDK支持折线分段颜色绘制能力。

纹理素材格式:纹理图宽高片须是2的整数幂,如64*64,否则无效;若设置了纹理图片,设置线颜色类型将无效。

注意:目前仅支持对折线设置纹理,其余覆盖物目前暂不支持设置纹理。

1添加分段纹理绘制折线数据,并构建构建分段纹理索引数组
Objective-C
Swift
//构建顶点数组
CLLocationCoordinate2D coords[5] = {0}; 
coords[0] = CLLocationCoordinate2DMake(39.968, 116.260);
coords[1] = CLLocationCoordinate2DMake(39.912, 116.324);
coords[2] = CLLocationCoordinate2DMake(39.968, 116.373);
coords[3] = CLLocationCoordinate2DMake(39.912, 116.439);
coords[4] = CLLocationCoordinate2DMake(39.968, 116.490);
//构建分段颜色索引数组
NSArray *drawIndexs = [NSArray arrayWithObjects:
                                [NSNumber numberWithInt:0],
                                [NSNumber numberWithInt:1],
                                [NSNumber numberWithInt:2],
                                [NSNumber numberWithInt:3], nil];
// 构造分段折线
BMKMultiPolyline *mulTexturePolyline  = [BMKMultiPolyline multiPolylineWithCoordinates:coords count:5 drawIndexs:drawIndexs];
        [_mapView addOverlay:mulTexturePolyline];
// 构建顶点数组
var coords = [CLLocationCoordinate2D]() 
coords.append(CLLocationCoordinate2D(latitude: 39.968, longitude: 116.260)) 
coords.append(CLLocationCoordinate2D(latitude: 39.912, longitude: 116.324)) 
coords.append(CLLocationCoordinate2D(latitude: 39.968, longitude: 116.373)) 
coords.append(CLLocationCoordinate2D(latitude: 39.912, longitude: 116.439)) 
coords.append(CLLocationCoordinate2D(latitude: 39.968, longitude: 116.490)) 
//构建分段纹理索引数组
let drawIndexs = [0, 1, 2, 3]
let mulTexturePolyline: BMKMultiPolyline = BMKMultiPolyline(coordinates: &coords, count: 5, drawIndexs: drawIndexs as [NSNumber])
mapView?.add(mulTexturePolyline)
2实现代理方法,并加载分段纹理图片
Objective-C
Swift
//根据overlay生成对应的View

- (__kindof BMKOverlayView *)mapView:(BMKMapView *)mapView viewForOverlay:(id <BMKOverlay>)overlay {

    if ([overlay isKindOfClass:[BMKMultiPolyline class]]){ 
           BMKMultiTexturePolylineView *mulTexturePolylineView = [[BMKMultiTexturePolylineView alloc] initWithMultiPolyline:overlay]; 
           // 设置polylineView的画笔宽度为12 
           mulTexturePolylineView.lineWidth = 12; 
           mulTexturePolylineView.textureImages = @[[UIImage imageNamed:@"traffic_texture_congestion"],
                                                    [UIImage imageNamed:@"traffic_texture_slow"],
                                                    [UIImage imageNamed:@"traffic_texture_smooth"],
                                                    [UIImage imageNamed:@"traffic_texture_unknown"]];
                                           nil]; 
           // LineJoinType,默认是kBMKLineJoinBevel(不支持虚线) 
           // 拐角处圆角衔接 
           mulTexturePolylineView.lineJoinType = kBMKLineJoinRound; 
           // 拐角处平角衔接 
           mulTexturePolylineView.lineJoinType = kBMKLineJoinBevel; 
           // 拐角处尖角衔接,ps尖角连接(尖角过长(大于线宽)按平角处理) 
           mulTexturePolylineView.lineJoinType = kBMKLineJoinMiter; 
         return mulTexturePolylineView 
} 
return nil; 
}
//MARK:BMKMapViewDelegate
/**
 根据overlay生成对应的BMKOverlayView
 
 
 */
func mapView(_ mapView: BMKMapView, viewFor overlay: BMKOverlay) -> BMKOverlayView? { 
    if overlay.isKind(of: BMKMultiPolyline.self) {
          let mulTexturePolylineView = BMKMultiTexturePolylineView(multiPolyline: overlay as! BMKMultiPolyline) 
          mulTexturePolylineView?.lineWidth = 12.0 
          // 构建纹理数组 
          let images: [UIImage] = [UIImage(named: "traffic_texture_congestion")!, 
                                   UIImage(named: "traffic_texture_slow")!, 
                                   UIImage(named: "traffic_texture_smooth")!, 
                                   UIImage(named: "traffic_texture_unknown")!] 
          mulTexturePolylineView?.textureImages = images 
          // LineJoinType,默认是kBMKLineJoinBevel(不支持虚线) 
          // 拐角处圆角衔接 
          mulTexturePolylineView?.lineJoinType = kBMKLineJoinRound 
//        // 拐角处平角衔接 
//        mulTexturePolylineView?.lineJoinType = kBMKLineJoinBevel; 
//        // 拐角处尖角衔接,ps尖角连接(尖角过长(大于线宽)按平角处理) 
//        mulTexturePolylineView?.lineJoinType = kBMKLineJoinMiter; 
       return mulTexturePolylineView 
 }  
 return nil 
}
3运行程序
效果如图:

newIos%2Fpolyline4v5.png

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