nil while parsing JSON in Swift - json

Question

I am doing some easy projects to learn new things. I started parsing JSON with SwiftyJSON. I am trying to show some JSON data to the tableView but now I am stuck. I do not know where is the nil and why. Can you help me guys? In given code I am trying to get the "Brands" and show them inside tableView or at least print those into console.
This is the .json file I have:
{
"Snuses": {
"Brands":{
"CATCH": [
{"Products":"white", "nicotine":"8.0"},
{"Products":"yellow", "nicotine":"8.0"}
],
"GENERAL": [
{"Products":"brown", "nicotine":"8.0"},
{"Products":"white", "nicotine":"8.0"}
]
}
}
}
And here I try to get the info like this:
var numberOfRows = 0
var snusBrandsArray = [String]()
override func viewDidLoad() {
super.viewDidLoad()
parseJSON()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func parseJSON(){
let path: String = NSBundle.mainBundle().pathForResource("snuses", ofType: "json") as String!
let jsonData = NSData(contentsOfFile: path) as NSData!
let readableJSON = JSON(data: jsonData, options: NSJSONReadingOptions.MutableContainers, error: nil)
var brands = readableJSON["Snuses", "Brands"]
NSLog("\(brands)")
numberOfRows = readableJSON["Snuses"].count
for i in 1...numberOfRows{
var brands = "Snuses"
brands += "\(i)"
var name = readableJSON["Snuses", "Brands"].string as String!
snusBrandsArray.append(name)
}
}

Answer 1

What about something simple, like this? Below is Playground code but the parsing is the same.
//: Playground
import UIKit
import Foundation
var jsonStr = "{ \"Snuses\": { \"Brands\":{ \"CATCH\": [ {\"Products\":\"white\", \"nicotine\":\"8.0\"}, {\"Products\":\"yellow\", \"nicotine\":\"8.0\"} ], \"GENERAL\": [ {\"Products\":\"brown\", \"nicotine\":\"8.0\"}, {\"Products\":\"white\", \"nicotine\":\"8.0\"} ] } } }"
func parseJSON(jsonStr:String) throws -> [AnyObject]? {
var brandNameKeys:[AnyObject]?
let jsonData = jsonStr.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
let json = try NSJSONSerialization.JSONObjectWithData(jsonData!, options: NSJSONReadingOptions())
if let brandNameDict = json["Snuses"]!?["Brands"] as? NSDictionary
{
brandNameKeys = brandNameDict.allKeys
}
return brandNameKeys
}
if let result = try parseJSON(jsonStr)
{
print(result)
}
In my Playground this outputs ["CATCH", "GENERAL"] which I think is what you want.
Here's a full UITableViewController demonstrating the solution in use:
import UIKit
class TableViewController: UITableViewController {
var data:[AnyObject]?
override func viewDidLoad() {
super.viewDidLoad()
if let path: String = NSBundle.mainBundle().pathForResource("Data", ofType: "json")
{
do
{
let jsonStr = try String(contentsOfFile: path)
data = try parseJSONStr(jsonStr)
}
catch _ {
print("Loading json failed")
}
}
}
// JSON Parsing
func parseJSONStr(jsonStr:String) throws -> [AnyObject]? {
var brandNameKeys:[AnyObject]?
let jsonData = jsonStr.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
let json = try NSJSONSerialization.JSONObjectWithData(jsonData!, options: NSJSONReadingOptions())
if let brandNameDict = json["Snuses"]!?["Brands"] as? NSDictionary
{
brandNameKeys = brandNameDict.allKeys
}
return brandNameKeys
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if let data = data
{
return data.count
}
else
{
return 0
}
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("SampleCell", forIndexPath: indexPath)
if let rowData = data![indexPath.row] as? String
{
cell.textLabel?.text = rowData
}
return cell
}
}