我正在构建一个 SwiftUI 应用程序，它根据用户纬度/经度显示数据。我的代码基于框架开发人员提供的这个示例。
使用 SwiftUI，我的LocationManager设置为：
class LocationViewModel: NSObject, ObservableObject, CLLocationManagerDelegate{
@Published var userLatitude: Double = 0.0
@Published var userLongitude: Double = 0.0
private let locationManager = CLLocationManager()
override init() {
super.init()
self.locationManager.delegate = self
self.locationManager.distanceFilter = 100.0
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
self.locationManager.requestWhenInUseAuthorization()
self.locationManager.startUpdatingLocation()
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
guard let location = locations.last else { return }
userLatitude = location.coordinate.latitude
userLongitude = location.coordinate.longitude
print("Hello I'm here! \(location)")
}
}
每当我回到我的ContentView并尝试阅读纬度/经度时，它只会显示为 0.0。但如果我在体内输出它们，值就会正确显示。
struct ContentView: View {
@State private var times = prayerTimes()
@ObservedObject var locationViewModel = LocationViewModel()
var body: some View {
NavigationView {
PrayerTimeView(times: $times)
.navigationBarTitle(Text("Prayer Times"))
}
}
static func prayerTimes() -> PrayerTimes? {
let cal = Calendar(identifier: Calendar.Identifier.gregorian)
let date = cal.dateComponents([.year, .month, .day], from: Date())
let coordinates = Coordinates(latitude: locationViewMode.userLatitude, longitude: locationViewMode.userLongitude)
var params = CalculationMethod.moonsightingCommittee.params
params.madhab = .hanafi
return PrayerTimes(coordinates: coordinates, date: date, calculationParameters: params)
}
}