Swift MapKit多条带不同颜色的折线。

huangapple
go评论101阅读模式
英文:

Swift MapKit Multiple Polylines with different colors

问题

我正在尝试在Swift的MapKit中为每个Polyline使用不同的颜色。
以下是一个简化的示例。

  1. func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
  2.     if let overlay_ = overlay as? MKPolyline {
  3.         let renderer = MKPolylineRenderer(overlay: overlay)
  4.         if overlay_.title == "2" {
  5.             renderer.strokeColor = UIColor.red
  6.         } else {
  7.             renderer.strokeColor = UIColor.blue
  8.         }
  9.         renderer.lineWidth = 5
  10.         return renderer
  11.     } else {
  12.         return MKOverlayRenderer()
  13.     }
  14. }

我在地图上有多个折线，我设置不同的overlay.title来区分颜色。
不幸的是，它总是采用最后设置的颜色并将其应用于所有折线。
在我的示例中，我有3个带有标题"0"、"1"和"2"的折线。结果是所有折线都是红色的描边颜色。
是否有人有解决此问题的想法？您需要更多的代码吗？

用于添加标题的代码如下：

  1. func showAllRoutes(map: MKMapView, route: Routes) {
  2.     var coordinates: [CLLocationCoordinate2D] = []
  4.     if dm.show_all_routes {
  5.         for x in route.routes.indices {
  6.             for y in route.routes[x].route_numbers {
  7.                 coordinates.append(CLLocationCoordinate2D(latitude: dm.alle_staende.locations[y].latitude, longitude: dm.alle_staende.locations[y].longitude))
  8.             }
  10.             let overlay = MKPolyline(coordinates: coordinates, count: coordinates.count)
  11.             overlay.subtitle = "Route"
  12.             overlay.title = "\(x)"
  13.             map.addOverlay(overlay)
  14.         }
  15.     }
  16. }
英文:

I am trying to have different colors for each Polyline in MapKit in Swift.
Here is a simplified example.

  1. func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
  2. 		if let overlay_ = overlay as? MKPolyline {
  3. 			let renderer = MKPolylineRenderer(overlay: overlay)
  4.             if overlay_.title == "2" {
  5.                 renderer.strokeColor = UIColor.red
  6.             } else {
  7.                 renderer.strokeColor = UIColor.blue
  8.             }
  9. 			renderer.lineWidth = 5
  10. 			return renderer
  11. 		} else {
  12. 			return MKOverlayRenderer()
  13. 		}
  14. 	}

I have multiple polylines in a map where I set different overlay.title to differentiate between the colors.

Unfortunately it always take the last set color and applies it to all polylines.

In my example below I have 3 polylines with title: "0", "1" and "2". The result is red stroke color for all polylines.

Does anyone has an idea how to fix this? Do you need more code?

Code to add title:

  1.   func showAllRoutes(map: MKMapView, route: Routes) {
  2.     var coordinates: [CLLocationCoordinate2D] = []
  3.     
  4.     
  5.     if dm.show_all_routes {
  6.         for x in route.routes.indices {
  7.             for y in route.routes[x].route_numbers {
  8.                 coordinates.append(CLLocationCoordinate2D(latitude: dm.alle_staende.locations[y].latitude, longitude:dm.alle_staende.locations[y].longitude))
  9.             }
  10.             
  11.             let overlay = MKPolyline(coordinates: coordinates, count: coordinates.count)
  12.             overlay.subtitle = "Route"
  13.             overlay.title = "\(x)"
  14.             
  15.             map.addOverlay(overlay)
  16.             
  17.         }
  18.         
  19.     }
  20. }

答案1

得分: 0

I believe your If statement isn't executed. Your code seems right. I once did what you want to do, and the result, as you see, is what you want.

Swift MapKit多条带不同颜色的折线。

My code:

  1. func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
  2.     if overlay is MKPolyline {
  3.         let renderer = MKPolylineRenderer(overlay: overlay)
  4.         renderer.strokeColor = .random()
  5.         renderer.lineWidth = 0
  6.         return renderer
  7.     } else if overlay is MKPolygon {
  8.         let renderer = MKPolygonRenderer(polygon: overlay as! MKPolygon)
  9.         renderer.strokeColor = .random()
  10.         renderer.fillColor = renderer.strokeColor?.withAlphaComponent(0.1)
  11.         renderer.lineWidth = 2
  12.         return renderer
  13.     }
  14.     return MKOverlayRenderer()
  15. }

You better to check your code with this if statement:

  1. if overlay_.title == "2" {
  2.     renderer.strokeColor = UIColor.red
  3. } else {
  4.     renderer.strokeColor = UIColor.blue
  5. }

To see if your code is okay or not, set a random color just to test it.

英文:

I believe your If statement isn't executed.your code seems right. I once did what you want to do, and the result as you see is what you want.

Swift MapKit多条带不同颜色的折线。

My code :

  1. func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
  2. if overlay is MKPolyline {
  3.             let renderer = MKPolylineRenderer(overlay: overlay)
  4.             renderer.strokeColor = .random()
  5.             renderer.lineWidth = 0
  6.             return renderer
  7.             
  8.         } else if overlay is MKPolygon {
  9.             let renderer = MKPolygonRenderer(polygon: overlay as! MKPolygon)
  10.             renderer.strokeColor = .random()
  11.             
  12.             renderer.fillColor = renderer.strokeColor?.withAlphaComponent(0.1)
  13.             renderer.lineWidth = 2
  14.             return renderer
  15.         }
  16.         
  17.         return MKOverlayRenderer() 
  18. }

You better to check your code with this if statement

  1. if overlay_.title == "2" {
  3.    renderer.strokeColor = UIColor.red
  5. } else {
  7.    renderer.strokeColor = UIColor.blue
  8. }

to see if your code is ok or not, set a random color just to test it.

答案2

得分: 0

明白了。
问题是：

  1. var coordinates: [CLLocationCoordinate2D] = []

它放错了位置，它添加了所有的线路，然后它们基本上都是相同的。这就是为什么它们具有相同的颜色。

  1. func showAllRoutes(map: MKMapView, route: Routes) {
  2.     
  3.     if dm.show_all_routes {
  4.         for x in route.routes.indices {
  6.             var coordinates: [CLLocationCoordinate2D] = []
  8.             for y in route.routes[x].route_numbers {
  9.                 coordinates.append(CLLocationCoordinate2D(latitude: dm.alle_staende.locations[y].latitude, longitude:dm.alle_staende.locations[y].longitude))
  10.             }
  12.             let overlay = MKPolyline(coordinates: coordinates, count: coordinates.count)
  13.             overlay.subtitle = "Route"
  14.             overlay.title = "\(x)"
  16.             map.addOverlay(overlay)
  18.         }
  19.     }
  20. }
英文:

Got it.
The problem is:

  1. var coordinates: [CLLocationCoordinate2D] = []

It was placed wrong, it adds all lines and then they are basically the same. That's why they have the same color

  1.  func showAllRoutes(map: MKMapView, route: Routes) {
  2.     
  3.     
  4.     if dm.show_all_routes {
  5.         for x in route.routes.indices {
  7.             var coordinates: [CLLocationCoordinate2D] = []
  9.             for y in route.routes[x].route_numbers {
  10.                 coordinates.append(CLLocationCoordinate2D(latitude: dm.alle_staende.locations[y].latitude, longitude:dm.alle_staende.locations[y].longitude))
  11.             }
  12.             
  13.             let overlay = MKPolyline(coordinates: coordinates, count: coordinates.count)
  14.             overlay.subtitle = "Route"
  15.             overlay.title = "\(x)"
  16.             
  17.             map.addOverlay(overlay)
  18.             
  19.         }
  20.         
  21.     }
  22. }

huangapple
  • 本文由 发表于 2023年2月26日 23:57:50
  • 转载请务必保留本文链接：https://go.coder-hub.com/75573206.html
  • mapkit
  • polyline
  • swift
匿名

发表评论

匿名网友

:?: :razz: :sad: :evil: :!: :smile: :oops: :grin: :eek: :shock: :???: :cool: :lol: :mad: :twisted: :roll: :wink: :idea: :arrow: :neutral: :cry: :mrgreen:

确定