Swift 使用mapbox自定义MGLPolyline

刚开始使用Mapbox，通过将其添加到locationManaged didUpdateLocations中来绘制MGLPolyline

   var shape = MGLPolyline(coordinates: &a, count: UInt(a.count))
   mapView.addAnnotation(shape) 

更改线宽不会在屏幕上更改它 func mapViewmapView:MGLMapView，多段线的线宽注释：MGLPolyline->CGFloat{return 20.0}

如何将笔划默认颜色从黑色更改为其他颜色？

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您需要将映射委托设置为self才能使函数工作。代码如下：

使用MGLMapViewDelegate启动viewController

然后在设置映射后，添加self.mapView.delegate=self-like-so

然后，您的功能将正常工作：

func mapView(mapView: MGLMapView, alphaForShapeAnnotation annotation: MGLShape) -> CGFloat {
   // Set the alpha for all shape annotations to 1 (full opacity)
   return 1
}

func mapView(mapView: MGLMapView, lineWidthForPolylineAnnotation annotation: MGLPolyline) -> CGFloat {
   // Set the line width for polyline annotations
   return 5.0
}

func mapView(mapView: MGLMapView, strokeColorForShapeAnnotation annotation: MGLShape) -> UIColor {
   // Give our polyline a unique color by checking for its `title` property
   return UIColor.redColor()
}

---

您需要将映射委托设置为self才能使函数工作。代码如下：

使用MGLMapViewDelegate启动viewController

然后在设置映射后，添加self.mapView.delegate=self-like-so

然后，您的功能将正常工作：

func mapView(mapView: MGLMapView, alphaForShapeAnnotation annotation: MGLShape) -> CGFloat {
   // Set the alpha for all shape annotations to 1 (full opacity)
   return 1
}

func mapView(mapView: MGLMapView, lineWidthForPolylineAnnotation annotation: MGLPolyline) -> CGFloat {
   // Set the line width for polyline annotations
   return 5.0
}

func mapView(mapView: MGLMapView, strokeColorForShapeAnnotation annotation: MGLShape) -> UIColor {
   // Give our polyline a unique color by checking for its `title` property
   return UIColor.redColor()
}

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@denislexic说了什么，但也要注意，一旦设置了初始宽度，就不能更改宽度

正如@denislexic所说，但也要注意，一旦设置了初始宽度，就不能更改宽度

有没有想过如何以3d格式显示多边形线条，比如MapBox在他们的博客视频中提到了什么？有没有想过如何以3d格式显示多边形线条，比如MapBox在他们的博客视频中提到了什么？

func mapView(mapView: MGLMapView, alphaForShapeAnnotation annotation: MGLShape) -> CGFloat {
   // Set the alpha for all shape annotations to 1 (full opacity)
   return 1
}

func mapView(mapView: MGLMapView, lineWidthForPolylineAnnotation annotation: MGLPolyline) -> CGFloat {
   // Set the line width for polyline annotations
   return 5.0
}

func mapView(mapView: MGLMapView, strokeColorForShapeAnnotation annotation: MGLShape) -> UIColor {
   // Give our polyline a unique color by checking for its `title` property
   return UIColor.redColor()
}