Swift and accessing nested JSON collections - json

Question

I am accessing a CMS with a pre-baked JSON output and it uses the following data structure. I am struggling to get down into the nested collections to get the version or loop through the categories.
{
results: [
{
pageData: {
info: {
version: "1"
},
categories: [
{
name: "Cat 1"
},
{
name: "Cat 2"
}
]
}
}
]
}
Here is the code I was attempting to use. Any help is appreciated!
guard let json = json, let results = json["results"], let pageData = results["pageData"], let info = pageData["info"] as? [String:Int], let version = info["version"],
let categories = Category.getCategories(json: json) else {
self.completionParse(RequestResult.errorParsing, self.categoriesResult)
return
}

Answer 1

To access the info and categories dictionaries you need to first access results Array and pageData that is inside the first object of results array.
guard let json = json, let results = json["results"] as? [[String:Any]],
let firstDic = results.first, let pageData = firstDic["pageData"] as? [String:Any],
let info = pageData["info"] as? [String:Int], let version = info["version"],
let categories = Category.getCategories(json: pageData) else {
self.completionParse(RequestResult.errorParsing, self.categoriesResult)
return
}

Answer 2

Tested below code on playground. This code is in latest swift 3.
if let dictResponse = json as? [String:Any] {
// This will get entire dictionary from your JSON.
if let results = dictResponse["results"] as? [[String:Any]]{
if let pageData = results.first? ["pageData"] as? [String:Any]{
if let info = pageData["info"] as? [String:Any]{
if let version = info["version"] as? String{
print(version)
// This will print 1
}
}
if let categories = pageData["categories"] as? [[String:Any]]{
// This will give you a category array. Later on you can iterate and get the dictionary’s value of each element.
for categoriesObj in categories.enumerated(){
if let name = categoriesObj.element["name"]{
print(name)
}
}
}
}
}
}