Simple getJSON() function - ios

Question

SwiftyJSON is an extremely useful add-on for Swift, importable via various methods (CocoaPods, Carthage, etc.) and I use it within many of my projects as they commonly require JSON files. So I wanted a nice simple function that I could call with necessary arguments and get my raw String value from my JSON file.

Answer 1

Step 1. We will create one protocol with one constructor method in it and Model class
protocol JSONable {
init?(parameter: JSON)
}
class Style: JSONable {
let ID :String!
let name :String!
required init(parameter: JSON) {
ID = parameter["id"].stringValue
name = parameter["name"].stringValue
}
/* JSON response format
{
"status": true,
"message": "",
"data": [
{
"id": 1,
"name": "Style 1"
},
{
"id": 2,
"name": "Style 2"
},
{
"id": 3,
"name": "Style 3"
}
]
}
*/
}
Step 2. We will create extension of JSON which will convert JSON to model class type object
extension JSON {
func to<T>(type: T?) -> Any? {
if let baseObj = type as? JSONable.Type {
if self.type == .array {
var arrObject: [Any] = []
for obj in self.arrayValue {
let object = baseObj.init(parameter: obj)
arrObject.append(object!)
}
return arrObject
} else {
let object = baseObj.init(parameter: self)
return object!
}
}
return nil
}
}
Step 3. Use code with Alamofire or other code.
Alamofire.request(.GET, url).validate().responseJSON { response in
switch response.result {
case .success(let value):
let json = JSON(value)
var styles: [Style] = []
if let styleArr = json["data"].to(type: Style.self) {
styles = styleArr as! [Style]
}
print("styles: \(styles)")
case .failure(let error):
print(error)
}
}
I hope this will be useful.
Please refer to this link for more information on this.
https://github.com/SwiftyJSON/SwiftyJSON/issues/714

Answer 2

Here is the function I created, feel free to use it yourself (does of course require SwiftJSON to be correctly integrated within your Xcode Swift project)...
func getJSON(value: [String], fileName: String) -> String{
guard let path = Bundle.main.path(forResource: fileName, ofType: "json"),
let jsonData = NSData(contentsOfFile: path) else{
print("Couldn't find the file on disk or failed to read it")
return "ERR."
}
let jsonObject = JSON(data: jsonData as Data)
guard let jsonValue = jsonObject[value].string else{
print("FAILED to find JSON object")
return "ERR."
}
return jsonValue
}
An example usage of this function would be let myJsonValue = getJSON(value: ["people","person1"], fileName: "database") which would get the value person1 from the people group in the JSON file named database.json. So, if the database.json file looked something like this
{
"people" : {
"person1" : "Bob",
"person2" : "Steve",
"person3" : "Alan",
}
}
the function would return a value of "Bob"
Hope this is a help to anyone, or if you have any suggestions for it then please let me know! Constructive criticism appreciated always.