SwiftyJSON conversion to multiple string arrays - ios

Question

Given the following sample JSON
{
"filters": [
{ "name" : "First Type",
"types" : ["md", "b", "pb"]},
{ "name" : "Second Type",
"types" : ["pt", "ft", "t"]},
{ "name" : "Third Type",
"types" : ["c", "r", "s", "f"]
}
],
"jobs": [
{ "title":"f",
"description" : "descrip text",
"criteria":[ "md", "ft", "s" ],
"img" : "www1"
},
{ "title":"boa",
"description" : "a description",
"criteria":[ "b", "pb", "f", "ft" ],
"img" : "www2"
},
{ "title":"BK",
"description" : "something here",
"criteria":[ "md", "pt", "ft", "b", "s" ],
"img" : "www3"
}
]
}
(Using Alamofire to create the response)
let responseJSON : JSON = JSON(response.result.value!)
1) I am trying to convert these into two String arrays. One array: let filter = [String : [String]] and another array for the jobs. How do I do it? (aka give a man a fish) The following are some sample code snippets, but none are even close to working.
let filterCategories = responseJSON["filters"].arrayValue.map({
$0["name"].stringValue
})
and
for (key,subJson):(String, JSON) in responseJSON["filters"] {
let object : filterObject = filterObject(category: key, list: subJson.arrayValue.map({ $0.stringValue }))
}
2) How do I learn how to use this properly? (aka teach a man to fish) I have been reading the documentation (https://github.com/SwiftyJSON/SwiftyJSON) but I'm struggling to understand it. I'm guessing the final answer will use .map, .stringValue, and .arrayValue. Ultimately though I'm trying to avoid lots of needless or unmanageable code.

Answer 1

Swift 4 provides JSON parsing support out of the box - maybe start within something like Ultimate Guide to JSON Parsing with Swift 4
Based on your available structure, I threw into a Playground and used...
// I was loading the JSON from a file within the Playground's Resource folder
// But basically, you want to end up with a reference to Data
let filePath = Bundle.main.path(forResource:"Source", ofType: "json")
let data = FileManager.default.contents(atPath: filePath!)
struct Filter: Codable {
let name: String;
let types: [String];
}
struct Job: Codable {
let title: String;
let description: String;
let criteria: [String];
let img: String;
}
struct Stuff: Codable {
let filters: [Filter];
let jobs: [Job];
}
let decoder = JSONDecoder();
let stuff = try! decoder.decode(Stuff.self, from: data!)
print("Filter:")
for filter in stuff.filters {
print(filter.name)
for type in filter.types {
print(" - \(type)")
}
}
print("Jobs:")
for job in stuff.jobs {
print(job.title)
print(job.description)
print(job.img)
for type in job.criteria {
print(" - \(type)")
}
}
to parse the results

Answer 2

You can implement Codable protocol to parse response. use your json response instead of this
let url = Bundle.main.url(forResource: "data", withExtension: "json")
let data = NSData(contentsOf: url!)
i used this for playground for testing.
struct Root: Codable {
let jobs: [Jobs]
let filters: [Filters]
private enum CodingKeys: String, CodingKey {
case jobs = "jobs"
case filters = "filters"
}
}
struct Filters: Codable {
let name: String?
let typees: String?
}
struct Jobs: Codable {
let title: String?
let description: String?
let criteria: [String]?
let img: String?
}
let url = Bundle.main.url(forResource: "data", withExtension: "json")
let data = NSData(contentsOf: url!)
do {
let root = try JSONDecoder().decode(Root.self, from: data as! Data)
if let name = root.jobs.first?.title {
print(name)
}
} catch let error as NSError {
print(error.description)
}