How to iterate through JSON - json

Question

I have a method which performs a GET request to an API:
public func getApiData(completion: #escaping () -> (), fullUrl: String)
{
let session = URLSession.shared
let url = URL(string: fullUrl)!
let task = session.dataTask(with: url) { (data, _, _) -> Void in
if let data = data {
self.serializeToJSON(jsonData: data)
completion()
}
}
task.resume()
}
Using SwiftyJSON I then convert the data into JSON:
private func serializeToJSON(jsonData: Data) {
self.json = JSON(data: jsonData)
print(self.json)
for (index,item) in self.json {
print("hi")
}
}
Printing the full JSON gives:
[{"TenantID":1,"Tenant1":"RAC"},{"TenantID":2,"Tenant1":"VictorMillwell"},{"TenantID":3,"Tenant1":"Comfort"},{"TenantID":4,"Tenant1":"Greenlight"}]
However the JSON can't be iterated through as the print("hi") isn't executed, I'm not sure why, I've looked everywhere on the internet to understand why it doesn't iterate and I cant seem to understand why.
Does anyone know why?

Answer 1

There is a good tutorial here, but in the manual it says you can loop like this:
// If json is .Dictionary
for (key,subJson):(String, JSON) in self.json {
// Do something you want
}
// If json is .Array
// The `index` is 0..<json.count's string value
for (index,subJson):(String, JSON) in self.json {
// Do something you want
}
if you don't know if it's a dictionary or array, maybe you can do it like this:
switch self.json.type {
case .array:
for (index,subJson):(String, JSON) in self.json {
// Do something you want
}
case .dictionary:
for (key,subJson):(String, JSON) in self.json {
// Do something you want
}
default:
// Do some error handling
}

Answer 2

It isn't clear why you want to enumerate the JSON. It's trivial to decode this JSON in Swift 4:
struct Tenant:Decodable { let TenantID:Int; let Tenant1:String }
let arr = try! JSONDecoder().decode([Tenant].self, from: data)
Now arr is a Swift array of Tenant, where each Tenant has a TenantID property and a Tenant1 property. And now you can do whatever you like with that array, including cycling through it if you wish.