Question

我想使用Lat long来获取地址，但总是变为零。请帮帮我，如何管理这种类型的功能，以便获得地址。我想在打电话的时候得到地址，但它总是给我的。

import re, locale, datetime

# considering dateString is the string representation of Date from Text
dateString = 'August 30th, 2017'
dateValues = re.search(r'(\w+)[\s](\d+)[A-Za-z\s,]*(\d+)', dateString)
if dateValues:
    cleanDate = dateValues.groups(0)[0]+' '+dateValues.groups(0)[1]+', '+dateValues.groups(0)[2]
    locale.setlocale(locale.LC_ALL, 'en_US')
    publishedDate = datetime.datetime.strptime(cleanDate, '%B %d, %Y').strftime('%m%d%Y')
    print publishedDate

Answer 1

在功能开始时，您将addressString设置为""，并在调用ceo.reverseGeocodeLocation的关闭之前返回此值。

不是直接从此函数返回值，而是需要使用闭包参数。你的功能应该更像这样（我添加了一些改进）：

func getAddressFromLatLon(pdblLatitude: String, pdblLongitude: String, completion: @escaping (String) -> Void)  {
    var addressString : String = ""
    var center : CLLocationCoordinate2D = CLLocationCoordinate2D()
    let lat: Double = Double("\(pdblLatitude)")!
    //21.228124
    let lon: Double = Double("\(pdblLongitude)")!
    //72.833770
    let ceo: CLGeocoder = CLGeocoder()
    center.latitude = lat
    center.longitude = lon

    let loc: CLLocation = CLLocation(latitude:center.latitude, longitude: center.longitude)

    ceo.reverseGeocodeLocation(loc, completionHandler: { (placemarks, error) in
        guard error != nil else {
            print("reverse geodcode fail: \(error!.localizedDescription)")
            return
        }

        let pm = placemarks![0]
        print("ADDRESS \(pm.country)---\(pm.locality)---\(pm.subLocality)---\(pm.thoroughfare)---\(pm.postalCode)---\(pm.subThoroughfare)")

        if pm.subLocality != nil {
            addressString = addressString + pm.subLocality! + ", "
        }
        if pm.thoroughfare != nil {
            addressString = addressString + pm.thoroughfare! + ", "
        }
        if pm.locality != nil {
            addressString = addressString + pm.locality! + ", "
        }
        if pm.country != nil {
            addressString = addressString + pm.country! + ", "
        }
        if pm.postalCode != nil {
            addressString = addressString + pm.postalCode! + " "
        }
        completion(addressString)
    })
}

文档指出，在reverseGeocodeLocation的完成区中，placemarks将为非空（如果它们不是nil），则不需要进行额外检查

调用函数时获取nil值

1 个答案: