arcgis for ios 10.2.5 如何绘制运动轨迹线

if (!lineLayer) {

        lineLayer = [[AGSGraphicsLayer alloc]init];

    }

    [self removeMapLayer:lineLayer];

    if (!lineSymnol) {

        lineSymnol   = [AGSSimpleLineSymbol simpleLineSymbolWithColor:[UIColor redColor] width:4];

    }

    if (!polyLine) {

        polyLine = [[AGSMutablePolyline  alloc]init];

    }

    [polyLine addPathToPolyline];

    [self.pointArray   enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {

        CGPoint point = [obj CGPointValue];

        [polyLine addPointToPath:[AGSPoint pointWithX:point.x y:point.y spatialReference:[AGSSpatialReference  spatialReferenceWithWKID:4490]]];

    }];

    AGSGraphic  *graphic = [[AGSGraphic   alloc]initWithGeometry:polyLine symbol:lineSymnol attributes:nil];

    [lineLayer addGraphic:graphic];

    [self addMapLayer:lineLayer];