I need to access lat and lng. How can I do that?
This is what I do now, and it doesn't work:
latitude <- map["location"]["lat"]
longitude <- map["location"]["lng"]
asked Mar 29, 2018 at 12:34
Bartłomiej Semańczyk
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Why you don't use the new Codable protocol ?user7219266– user72192662018-03-29 12:56:07 +00:00Commented Mar 29, 2018 at 12:56
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4 Answers
You just simply need:
latitude <- map["location.lat"]
longitude <- map["location.lng"]
So far ObjectMapper supports dot notation within keys for easy mapping of nested objects (you could find it under "Easy Mapping of Nested Objects" in library documentation).
answered Mar 29, 2018 at 12:42
Bartłomiej Semańczyk
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You would need to declare a separated class for the location to contain the lat and the lng properties:
class Location: Mappable {
var lat: Double?
var lng: Double?
required init?(map: Map){ }
func mapping(map: Map) {
lat <- map["lat"]
lng <- map["lng"]
}
}
thus you could use it as:
class Base: Mappable {
var location: Location?
// ...
required init?(map: Map){ }
func mapping(map: Map) {
location <- map["location"]
//...
}
}
It would represent a nested type for mapping the base object.
Aside bar note: you might also want to check Codable - Encoding and Decoding Custom Types.
4 Comments
Ahmad F
Are you sure that your answer worked? :D
Bartłomiej Semańczyk
The same question about first element in array of elements. Do you know how to do this?
Ahmad F
@BartłomiejSemańczyk could you please elaborate?
Bartłomiej Semańczyk
I have found an answer: ‚.0’
Instead of using ObjectMapper , you can use JSONDecoder , that will enable you to write only the key of the objects inside the json , instead of writing them twice with ObjectMapper. (as a property and inside map function ) , especially if the server keys naming is suitable for you
1 Comment
Bartłomiej Semańczyk
Yes, you are right, but very often I need to change their naming;) But your answer is very helpful...
Hope this helps you
let data = NSData(contentsOf: searchUrl as URL)
let json = try! JSONSerialization.jsonObject(with: data! as Data, options: JSONSerialization.ReadingOptions.allowFragments) as! [String:AnyObject]
let status = json["status"] as! String
print(status)
if status == "OK" {
if let result = json["results"] as? [[String:AnyObject]] {
if let geometry = result[0]["geometry"] as? [String:AnyObject] {
if let location = geometry["location"] as? [String:AnyObject] {
lat = location["lat"] as! Double
lng = location["lng"] as! Double
print(lat)
print(lng)
}
}
}
3 Comments
Ahmad F
The question has nothing to do with using
JSONSerialization. Even so, your answer doesn't provide a correct result.
Gowtham Sooryaraj
but am using this concept in my project
Gowtham Sooryaraj
anyways it's not helping you!.But definitely it's help some developers