Retrieving JSON elements in Swift 3 - json

Question

I have following JSON file
{
"events": [
{
"date": "01/11/2017",
"name": [
"Tulsi Vivah",
"Pradosh Vrat"
],
"photo": [
"photo_chaturthi",
"photo_ekadashi"
]
},
{
"date": "03/11/2017",
"name": [
"Guru Nanak Jayanti"
],
"photo": [
"photo_chaturthi",
"photo_ekadashi"
]
}
]
}
I want to parse this and put the elements in the objectArray in the code below:
struct Objects {
var sectionName : String!
var sectionObjects : [String]!
var sectionImages : [String]!
}
var objectArray = [Objects]()
I have written following code for reading the file:
if let file = Bundle.main.url(forResource: "EventsEnglish112017", withExtension: "json") {
let data = try Data(contentsOf: file)
let json = try JSONSerialization.jsonObject(with: data as Data, options: [])
My question is how do I typecast "json" to read the individual elements to fill the above objectArray.
Thanks!

Answer 1

A JSON is a dictionary of type [String:Any?]
To parse it:
if let dictionary = json as? [String: Any?] {
if let events = dictionary["events"] as? [[String: Any?]] {
// events is an array of JSON objects, so it's an array of dictionaries
for item in events
{
let date = item["date"] as? String // this is a String?
let name = item["name"] as? [String]
// same goes for 'photo'
}
}
}
Now that you have retrieved the data, you can use it to costruct your custom objects.
But it's better if you use some library that will make it for you, or use Swift4

Answer 2

To retrieve data from JSON file
(Swift 3)
if let path = NSBundle.mainBundle().pathForResource("myJson", ofType: "json")
{
if let jsonData = NSData(contentsOfFile: path, options: .DataReadingMappedIfSafe, error: nil)
{
if let jsonResult = NSJSONSerialization.JSONObjectWithData(jsonData, options: NSJSONReadingOptions.MutableContainers, error: nil) as? [String: Any]
{
if let eventsInfo = jsonResult["events"] as? [Any]
{
// Here you will get your data in Array format.
// for e.g
// print(eventsInfo[0]["date"])
// Just pass this eventsInfo (Array) into you Object model initializer and parse with the keys there.
}
}
}
}
(Swift 4)
if let path = Bundle.main.path(forResource: "myJson", ofType: "json") {
do {
let data = try Data(contentsOf: URL(fileURLWithPath: path), options: .mappedIfSafe)
let jsonResult = try JSONSerialization.jsonObject(with: data, options: .mutableLeaves)
if let jsonResult = jsonResult as? Dictionary<String, AnyObject>, let eventsInfo = jsonResult["events"] as? [Any] {
// Here you will get your data in Array format.
// for e.g
// print(eventsInfo[0]["date"])
// Just pass this eventsInfo (Array) into you Object model initializer and parse with the keys there.
}
} catch {
// handle error
}
}