Swift - Generate an Address Format from Reverse Geocoding

Question

I am trying to generate a Formatted Full address using CLGeocoder in Swift 3. I referred to this SO thread to get the code given below.

However, sometimes the app crashe

Answer 1

1. For fixing the empty address issue, either you can use a class property to hold the appended value or you can use a closure to return the value back to the calling function
2. For fixing the crash you need to avoid the force unwrapping of optionals

Using a closure you can do it like:

// Using closure
func getAddress(handler: @escaping (String) -> Void)
{
    var address: String = ""
    let geoCoder = CLGeocoder()
    let location = CLLocation(latitude: selectedLat, longitude: selectedLon)
    //selectedLat and selectedLon are double values set by the app in a previous process
    
    geoCoder.reverseGeocodeLocation(location, completionHandler: { (placemarks, error) -> Void in
        
        // Place details
        var placeMark: CLPlacemark?
        placeMark = placemarks?[0]
        
        // Address dictionary
        //print(placeMark.addressDictionary ?? "")
        
        // Location name
        if let locationName = placeMark?.addressDictionary?["Name"] as? String {
            address += locationName + ", "
        }
        
        // Street address
        if let street = placeMark?.addressDictionary?["Thoroughfare"] as? String {
            address += street + ", "
        }
        
        // City
        if let city = placeMark?.addressDictionary?["City"] as? String {
            address += city + ", "
        }
        
        // Zip code
        if let zip = placeMark?.addressDictionary?["ZIP"] as? String {
            address += zip + ", "
        }
        
        // Country
        if let country = placeMark?.addressDictionary?["Country"] as? String {
            address += country
        }
        
       // Passing address back
       handler(address)
    })
}

You can call the method like:

getAddress { (address) in
    print(address)
}