我已经使用 MapKit 实现了 Apple SwiftUI 教程的一个稍微改变的版本。 .
当我运行它时,我收到错误消息并调整我得到的相应 View 的大小:[SwiftUI] NSHostingView is being laid out reentrantly while rendering its SwiftUI content. This is not supported and the current layout pass will be skipped.
查看调用代码:
MapView(coordinate: location?.coordinates)
.frame(minHeight: 200)
.overlay(
GeometryReader{
proxy in
Button("Open in Maps") {
if (self.location?.coordinates != nil){
let destination = MKMapItem(placemark: MKPlacemark(coordinate: self.location!.coordinates))
destination.name = "the car"
destination.openInMaps()
}
}
.frame(width: proxy.size.width, height: proxy.size.height, alignment: .bottomTrailing)
.offset(x: -10, y: -10)
}
)
map View 结构:import SwiftUI
import MapKit
/// a view containing the map
struct MapView: NSViewRepresentable {
/// the location coordinates
var coordinate: CLLocationCoordinate2D?
func makeNSView(context: Context) -> MKMapView {
MKMapView(frame: .zero)
}
func updateNSView(_ nsView: MKMapView, context: Context) {
let span = MKCoordinateSpan(latitudeDelta: 0.02, longitudeDelta: 0.02)
var region: MKCoordinateRegion = MKCoordinateRegion()
if (self.coordinate != nil){
region = MKCoordinateRegion(center: coordinate!, span: span)
}
nsView.setRegion(region, animated: true)
if ((nsView.annotations.count == 0) && (self.coordinate != nil)){
let locationPin: MKPointAnnotation = MKPointAnnotation()
locationPin.coordinate = coordinate!
nsView.addAnnotations([locationPin])
}
}
}
最佳答案
得到相同的消息并拼命尝试在 main.sync 中进行第一次调度,但在运行时出现异常。
然后我只是尝试了异步。
{
let region = MKCoordinateRegion(center: visibleArea.coordinate,
latitudinalMeters: 200, longitudinalMeters: 200)
DispatchQueue.main.async
{
nsView.setRegion(region, animated: false)
}
}
也适用于动画 DispatchQueue.main.async
{
nsView.setRegion(region, animated: true)
}
实际上,这暂时奏效了:它删除了希望这只是一个小补丁,直到 Apple 清理它(或解释原因)。
关于swift - MapKit 错误 : NSHostingView is being laid out reentrantly while rendering its SwiftUI content,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/63646954/