Extract JSON data from feed using Alamofire - ios

Question

I am using Alamofire to parse a JSON API, however, I can't figure out how to parse the response data from Alamofire.
When I try to loop through the fetched data, XCode gives me "Segmentation Fault: 11" error.
Here is my current code:
var tableData:NSArray // I have tried several variable types, NSDictionary, String etc.
--
override func viewDidLoad() {
super.viewDidLoad()
self.getJsonData()
}
func getJsonData() {
Alamofire.request(.GET, "https://hotell.difi.no/api/json/mattilsynet/smilefjes/tilsyn", parameters: [:])
.responseJSON { response in
if let JSON = response.result.value {
// print("JSON: \(response.result)")
for entry in JSON["entries"] {
print("\(entry)") // this is where everything crashes
}
}
self.doTableRefresh()
}
}
func doTableRefresh() {
dispatch_async(dispatch_get_main_queue(), {
self.tableView.reloadData()
return
})
}
What is the correct data format for this JSON result: https://hotell.difi.no/api/json/mattilsynet/smilefjes/tilsyn ? And how do I take the data and populate the tableview?

Answer 1

Convert the response to NSDictionary and NSArray:
func getJsonData() {
Alamofire.request(.GET, "https://hotell.difi.no/api/json/mattilsynet/smilefjes/tilsyn", parameters: [:])
.responseJSON { response in
if let JSON = response.result.value as? NSDictionary{
if let entries = JSON["entries"] as? NSArray{
for entry in entries {
if let entry = entry as? NSDictionary {
for (key, value) in entry {
print("\(key) - \(value)")
}
}
}
}
}
}
}

Answer 2

Without using SwiftyJSON, the idea is to know the right type for each object and successfully downcast.
response.result.value is a dictionary: [String:AnyObject], and the content of json["entries"] is an array of dictionaries: [[String:AnyObject]]. Etc.
Example:
func getJsonData() {
Alamofire.request(.GET, "https://hotell.difi.no/api/json/mattilsynet/smilefjes/tilsyn", parameters: [:])
.responseJSON { response in
if let json = response.result.value as? [String:AnyObject] {
if let entries = json["entries"] as? [[String:AnyObject]] {
for entry in entries {
print(entry) // each entry is a dictionary of type [String:AnyObject]
}
// example of accessing an entry:
if let firstEntry = entries.first, value = firstEntry["adrlinje1"] as? String {
print(value) // "Christian IV gate 3"
}
}
}
}
}

Answer 3

You have to specify the type of your expected value (With SwiftyJSON):
for entry in JSON["entries"] { // Here
print(entry.stringValue)
}