Swift CLGeocoder 获取时区

Question

恐怕我的完成处理程序可能都搞砸了。我想做的是使用纬度和经度来获取时区。我希望整个函数返回 TimeZone 类型的值。以下代码有效，因为我可以获得正确的时区，但在返回阶段它崩溃了。

func getTimeZone(location: CLLocationCoordinate2D, completion: () -> TimeZone) -> TimeZone {
    
    var timeZone = TimeZone(identifier: "timeZone")
    var placemark: CLPlacemark?
    let cllLocation = CLLocation(latitude: location.latitude, longitude: location.longitude)
    let geocoder = CLGeocoder()
    
    geocoder.reverseGeocodeLocation(cllLocation) { placemarks, error in
        
        if let error = error {
            print(error.localizedDescription)
        } else {
            
            if let placemarks = placemarks {
                placemark = placemarks.first
            }
        }
        DispatchQueue.main.async {
            
            if let optTime = placemark?.timeZone {
                timeZone = optTime
            }

            return completion()
        }
    }
}

Answer 1

我认为完成实现有问题。尝试将其更改为这样的内容:

func getTimeZone(location: CLLocationCoordinate2D, completion: @escaping ((TimeZone) -> Void)) {
    let cllLocation = CLLocation(latitude: location.latitude, longitude: location.longitude)
    let geocoder = CLGeocoder()

    geocoder.reverseGeocodeLocation(cllLocation) { placemarks, error in

        if let error = error {
            print(error.localizedDescription)

        } else {
            if let placemarks = placemarks {
                if let optTime = placemarks.first!.timeZone {
                    completion(optTime)
                }
            }
        }
    }
}

然后你可以像这样调用该函数:

getTimeZone(location: CLLocationCoordinate2D(latitude: CLLocationDegrees(9.62), longitude: CLLocationDegrees(84.62))) { timeZone in
    print("Time zone: \(timeZone)")
}