Calling closure in map function

I have the code to convert UTC datetime to the local datetime based on a given address and this function is a closure. I want to call this function in a map function to change all my UTC time in an array of structs to local datetime. Here is my code for the converting UTC to local datetime.

func getTimeZoneFrom(address: String, completion: @escaping(_ coordinate: String?, _ error: Error?) -> () ) {      CLGeocoder().geocodeAddressString(address) { completion($0?.first?.timeZone?.identifier, $1) }  }    func calculateLocalDateTime(from date: String, identifier: String, using format: String) -> Date {      let formatter = DateFormatter()      formatter.locale = Locale.autoupdatingCurrent      formatter.dateFormat = format            if let date = formatter.date(from: date) {          if let timeInterval = TimeZone.init(identifier: identifier)?.secondsFromGMT(for: date) {              let localDateTime = Date(timeInterval: TimeInterval(timeInterval), since: date)              return localDateTime          }      } else {          print("Cannot get the date using the provided date format.\nPlease provide adequate date format.")          return Date()      }      return Date()  }    func getLocalDateTime(date: String, address: String, completionHandler: @escaping ((Date) -> Void)) {      getTimeZoneFrom(address: address) { (timeZoneIdentifier, error) in          guard let identifier = timeZoneIdentifier, error == nil else { return }          let localDateTime = calculateLocalDateTime(from: date, identifier: identifier, using: "yyyy-MM-dd'T'HH:mm:ss'Z'")            completionHandler(localDateTime)      }  }    func dateTimeUsingMediumFormat(provided dateTime: Date) -> String {      return DateFormatter.localizedString(from: dateTime, dateStyle: .medium, timeStyle: .short)  }  

Here is my attempt to apply this function in my map function.

struct LocationDateModel {      var address: String      var date: String            init(address: String, date: String) {          self.address = address          self.date = date      }  }    let models = [LocationDateModel(address: "Windsor, ON", date: "2021-01-07T19:27:54Z"),                LocationDateModel(address: "Windsor, ON", date: "2021-01-07T21:54:54Z"),                LocationDateModel(address: "Windsor, ON", date: "2021-01-08T00:36:56Z"),                LocationDateModel(address: "Edmonton, AB", date: "2021-01-11T21:04:53Z"),                LocationDateModel(address: "Edmonton, AB", date: "2021-01-12T15:56:19Z"),                LocationDateModel(address: "Edmonton, AB", date: "2021-01-12T16:08:28Z")]    let modifiedModels = models.map { model -> LocationDateModel in          var temp = ""          getLocalDateTime(date: model.date, address: model.address) { (value) in              temp = dateTimeUsingMediumFormat(provided: value)          }          return LocationDateModel(address: model.address, date: temp)      }  

However, this is return an empty string for date as declared in temp which means its returning the declaration of the variable but not going into the closure. How can I approach this.

https://stackoverflow.com/questions/67238176/calling-closure-in-map-function April 24, 2021 at 08:15AM