Parse JSON response with Swift 3 - ios

Question

I have JSON looking like this:
{"posts":
[
{
"id":"1","title":"title 1"
},
{
"id":"2","title":"title 2"
},
{
"id":"3","title":"title 3"
},
{
"id":"4","title":"title 4"
},
{
"id":"5","title":"title 5"
}
],
"text":"Some text",
"result":1
}
How can I parse that JSON with Swift 3?
I have this:
let url = URL(string: "http://domain.com/file.php")!
let request = URLRequest(url: url)
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data else {
print("request failed \(error)")
return
}
do {
if let json = try JSONSerialization.jsonObject(with: data) as? [String: String], let result = json["result"] {
// Parse JSON
}
} catch let parseError {
print("parsing error: \(parseError)")
let responseString = String(data: data, encoding: .utf8)
print("raw response: \(responseString)")
}
}
task.resume()
}

Answer 1

Use this to parse your data:
let url = URL(string: "http://example.com/file.php")
URLSession.shared.dataTask(with:url!, completionHandler: {(data, response, error) in
guard let data = data, error == nil else { return }
do {
let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as! [String:Any]
let posts = json["posts"] as? [[String: Any]] ?? []
print(posts)
} catch let error as NSError {
print(error)
}
}).resume()
Use guard to check if you have data and that error is empty.
Swift 5.x version
let url = URL(string: "http://example.com/file.php")
URLSession.shared.dataTask(with:url!, completionHandler: {(data, response, error) in
guard let data = data, error == nil else { return }
do {
let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as? [String:Any]
let posts = json?["posts"] as? [[String: Any]] ?? []
print(posts)
} catch {
print(error)
}
}).resume()

Answer 2

In swift 3.0 for GET method:
var request = URLRequest(url: URL(string: "Your URL")!)
request.httpMethod = "GET"
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else { // check for fundamental networking error
print("error=\(String(describing: error))")
return
}
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 { // check for http errors
print("statusCode should be 200, but is \(httpStatus.statusCode)")
print("response = \(String(describing: response))")
}
let responseString = String(data: data, encoding: .utf8)
print("responseString = \(String(describing: responseString))")
}
task.resume()
In swift 3.0 for POST method:
var request = URLRequest(url: URL(string: "Your URL")!)
request.httpMethod = "POST"
let postString = "user_name=ABC" // Your parameter
request.httpBody = postString.data(using: .utf8)
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else { // check for fundamental networking error
print("error=\(String(describing: error))")
return
}
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 { // check for http errors
print("statusCode should be 200, but is \(httpStatus.statusCode)")
print("response = \(String(describing: response))")
}
let responseString = String(data: data, encoding: .utf8)
print("responseString = \(String(describing: responseString))")
}
task.resume()

Answer 3

Because your data structure of test json should be "[String: AnyObject]". The json key "posts" value is Array type.

Answer 4

DISTANCE--DIFFICULT API
========================>
class ViewController: UIViewController {
var get_data = NSMutableData()
var get_dest = NSArray()
var org_add = NSArray()
var row_arr = NSArray()
var ele_arr = NSArray()
var ele_dic = NSDictionary()
var dist_dic = NSDictionary()
var dur_dic = NSDictionary()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
getmethod()
}
func getmethod()
{
let url_str = URL(string: "https://maps.googleapis.com/maps/api/distancematrix/json?units=imperial&departure_time=1408046331&origins=37.407585,-122.145287&destinations=37.482890,-122.150235")
let url_req = URLRequest(url: url_str!)
let task = URLSession.shared.dataTask(with: url_req) { (data, response, error) in
if let my_data = data
{
print("my data is----->",my_data)
do
{
self.get_data.append(my_data)
let jsondata = try JSONSerialization.jsonObject(with: self.get_data as Data, options: [])as! NSDictionary
print("json data is--->",jsondata)
self.get_dest = jsondata.object(forKey: "destination_addresses")as! NSArray
let get_dest1:String = self.get_dest.object(at: 0) as! String
print("destination is--->",get_dest1)
self.org_add = jsondata.object(forKey: "origin_addresses")as! NSArray
let get_org:String = self.org_add.object(at: 0)as! String
print("original address is--->",get_org)
self.row_arr = jsondata.object(forKey: "rows")as! NSArray
let row_dic = self.row_arr.object(at: 0)as! NSDictionary
self.ele_arr = row_dic.object(forKey: "elements")as! NSArray
self.ele_dic = self.ele_arr.object(at: 0)as! NSDictionary
self.dist_dic = self.ele_dic.value(forKey: "distance")as! NSDictionary
print("distance text is--->",self.dist_dic.object(forKey: "text")as! String)
print("distance value is--->",self.dist_dic.object(forKey: "value")as! Int)
// self.ele_dic = self.ele_arr.object(at: 1)as! NSDictionary
self.dur_dic = self.ele_dic.value(forKey: "duration")as! NSDictionary
print("duration text--->",self.dur_dic.value(forKey: "text")as! String)
print("duration value--->",self.dur_dic.value(forKey: "value")as! Int)
print("status---->",self.ele_dic.object(forKey: "status")as! String)
}
catch
{
print("error is--->",error.localizedDescription)
}
}
};task.resume()
}