How to get element from JsonResult using loop (Swift 3) - swift3

Question

let jsonResult = try JSONSerialization.jsonObject(with: jsonData!, options: .mutableContainers) as! NSDictionary
When debugger comes on above line, in debug console there is ->
jsonResult =(NSDictionary) 2 key/value pairs
>[0] = “CompanyList” : 140 elements
>[1] = “StatusTable” : 1 element
jsonResult contains 2 array
Now i wanna to traverse CompanyList using Loop
like
let arr_CompanyList = [CompanyList]()
for dictionary in json as! [[CompanyList]]
{
//arr_CompanyList.append(dictionary)
}
but is gives error
Here is CompanyList Class
public class CompanyList {
public var companyAlt_Key : Int?
public var company_Name : String?
public var tableName : String?
}
How should i do?

Answer 1

You cannot convert your JSON Array response to directly your Class objects array, you need to create your custom class object from the JSON response. Also instead of using NSDictionary in swift use native type Dictionary.
if let jsonResult = (try? JSONSerialization.jsonObject(with: jsonData!, options: [])) as? [String:Any] {
if let companyList = jsonResult["CompanyList"] as? [[String:Any]] {
//Now loop through the companyList array
let arr_CompanyList = companyList.flatMap(CompanyList.init)
//To get array of companyname
let companyNames = companyList.flatMap { $0["Company_Name"] as? String }
print(companyNames)
}
}
Now simply add one init with your CompanyList class like this way.
public class CompanyList {
public var companyAlt_Key : Int?
public var company_Name : String?
public var tableName : String?
init?(dictionary: [String:Any]) {
guard let companyAltKey = dictionary["CompanyAlt_Key"] as? Int,
let companyName = dictionary["Company_Name"] as? String,
let tableName = dictionary["TableName"] as? String else {
return nil
}
self.companyAlt_Key = companyAltKey
self.company_Name = companyName
self.tableName = tableName
}
}
Note: Inside init? method with dictionary you need to access your key that contains value according to your class property.