swift - 当我将 MKCircle 添加到 mapKit 的覆盖层时，编译器中出现了很多警告

Question

我试图弄清楚如何消除我的委员会上的大量警告，我得出的结论是，这些警告发生在我将叠加层添加到我的mapKit之后

这是我添加叠加层的部分..

    let FireLocation = CLLocationCoordinate2D(latitude: 40.836352, longitude: 14.306019)
    let CircularRegion = CLCircularRegion(center: FireLocation, radius: 500, identifier: "fire")
    CircularRegion.notifyOnEntry = true
    CircularRegion.notifyOnExit = true
    self.locatManager.startMonitoring(for: CircularRegion)

     let geo = MKCircle(center: FireLocation, radius: CircularRegion.radius)
     mapkitView.addOverlay(geo)

之后，我在委托(delegate)方法上自定义这些覆盖...

  func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {

        guard let circularOverlay = overlay as? MKCircle else {return MKOverlayRenderer()}


        let renderer = MKCircleRenderer(overlay: circularOverlay)
        renderer.strokeColor = .red
        renderer.fillColor = .yellow
        renderer.alpha = 0.3
        renderer.lineWidth = 2

        return renderer
    }

我在控制台上收到的警告...

2018-10-25 15:09:04.919237+0200 SeeFire[37911:13344200] This application is modifying the autolayout engine from a background thread after the engine was accessed from the main thread. This can lead to engine corruption and weird crashes. 2018-10-25 15:09:04.921562+0200 SeeFire[37911:13344200] This application is modifying the autolayout engine from a background thread after the engine was accessed from the main thread. This can lead to engine corruption and weird crashes.

如果我评论添加覆盖层的行，则不会出现警告并且一切正常，我做错了什么？

MKCircleRenderer 和 MKCircleView 之间有什么区别，我如何知道应该使用哪一个？

提前感谢您的回答。

Answer 1

尝试以下代码从主线程访问。

DispatchQueue.main.async {
    mapkitView.addOverlay(geo)
}