I am fetching data from JSON, and store inside in an NSArray. I've verified that I've successfully grab the data from JSON. The grabbed data will be stored into strings, then added into class array. However I get an error: "Thread: 6: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)"
var personList = [PersonTable]()
do {
let resultJSON = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions())
let resultArray = resultJSON as? NSArray
for jsonObjectString in resultArray! {
let name = jsonObjectString["Name"] as! String
let code = jsonObjectString["Code"] as! String
let description = jsonObjectString["Description"] as! String
self.personList[count].addPerson(Name, code: code, description: description)
count++
}
This is my class array in a separate swift file.
func addPerson(name: String, code: String, description: String){
self.name = name
self.code = code
self.description = description
}
Related
I am trying to parse the JSON object received from Web service which gives the result as JSON object of status and data.data again is a array of objects, from this object I want to take one element on the basis of which I have to fill a tableview.
web Service results comes as
{"status":1,"data":[{"service_id":"1","service_name":"Painter"},{"service_id":"2","service_name":"Plumber"},{"service_id":"3","service_name":"Electrician"},{"service_id":"4","service_name":"Handyman"},{"service_id":"5","service_name":"Carpenter"},{"service_id":"6","service_name":"Mason"}]}
parsing in swift I did as:--
created one class
class ABC: NSObject {
var service_name:String?
var service_id : Int?
init(service_name:String,service_id:Int) {
self.service_name = service_name
self.service_id = service_id
}
let myUrl = URL(string: "services.php");
var request = URLRequest(url:myUrl!)
request.httpMethod = "POST"// Compose a query string
let task = URLSession.shared.dataTask(with: request) { (data: Data?, response: URLResponse?, error: Error?) in
if error != nil
{
print("error=\(String(describing: error))")
return
}
do {
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary
if let parseJSON = json
{
let status=parseJSON["status"] as? Int
let newdata : NSDictionary = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers) as! NSDictionary
self.model=(newdata.value(forKey: "data") as? [ABC])!
My problem is I am getting an array of objects in self.model as service_name and service_id keys.Now I want to take out one array of strings that contains all the service_name object values.Its saying not able to convert NSArray to swift array.
As already mentioned by others use (De)codable. It's easy to use and very comfortable. No type cast and no literal keys.
Create two structs, declare the members as non-optional constants with camelCased names and omit the initializer.
struct Root : Decodable {
let status : Int
let data : [Service]
}
struct Service : Decodable {
let serviceName : String
let serviceId : String
}
Then decode the JSON in another class or struct
let myUrl = URL(string: "services.php")
var request = URLRequest(url: myUrl!)
request.httpMethod = "POST"// Compose a query string
let task = URLSession.shared.dataTask(with: request) { data, _, error in
if let error = error { print(error); return }
do {
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
let json = try decoder.decode(Root.self, from: data!)
let status = json.status
let newdata = json.data
} catch { print(error))
}
task.resume()
I would recommend to drop JSONSerialization and use Codable protocol instead with CodingKeys.
Here is a simple example to see how it works.
struct Service : Codable {
let id : Int
let name : String
// keys
private enum CodingKeys: String, CodingKey {
case id = "service_id"
case name = "service_name"
}
}
...
// assuming our data comes from server side
let jsonString = "..."
let jsonData = jsonString.data(using: .utf8)!
do {
let jsonDecoder = JSONDecoder()
let user = try jsonDecoder.decode(Service.self, from: jsonData)
print("Getting service: \(service.id) \(service.name)")
} catch {
print("Unexpected error: \(error).")
}
More documentation here.
Use native Swift type Dictionary everywhere you use NSDictionary now
Then get certain value for key by specifing key in dictionary's subscript
if let model = newData["data"] as? [ABC] {
self.model = model
}
Anyway, I would suggest you to start using Codable instead of JSONSerialization
struct Response: Decodable {
let status: Int
let data: [ABC]
}
struct ABC: Decodable {
let serviceName: String
let serviceId: String // note that `serviceId` isn’t `Int` But `String`
}
and then decode your data using JSONDecoder
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
do {
let response = try decoder.decode(Response.self, from: data!)
self.model = response.data
} catch { print(error) }
Hi guys I don't know why the array Places returns weird values like 0x6080004b3aa0 instead of displaying my title, coordinate and subtitle out of my JSON url. Thanks for your Help!
import MapKit
#objc class Place: NSObject {
var title: String?
var coordinate: CLLocationCoordinate2D
var subtitle: String?
init(title:String,subtitle:String, coordinate:CLLocationCoordinate2D){
self.title = title
self.coordinate = coordinate
self.subtitle = subtitle
}
static func getPlaces() -> [Place] {
guard let url = NSURL(string: "https://script.googleusercontent.com/macros/echo?user_content_key=Z-LfTMdhgAg_6SRd-iMucSyWu-LFBQO8MLxJZ6DPcL05Rtr3joCCypWD2l46qaegSpVpVINc1DLl5inoDOgGx3p3ANpY1AkGOJmA1Yb3SEsKFZqtv3DaNYcMrmhZHmUMWojr9NvTBuBLhyHCd5hHa1ZsYSbt7G4nMhEEDL32U4DxjO7V7yvmJPXJTBuCiTGh3rUPjpYM_V0PJJG7TIaKp4bydEiKBUZP6fpOyGJIhkmEGneM7ZIlWloTVbXmkjs15vHn8T7HCelqi-5f3gf3-sKiW3k6MDkf31SIMZH6H4k&lib=MbpKbbfePtAVndrs259dhPT7ROjQYJ8yx") else { return [] }
let request = NSMutableURLRequest(url: url as URL!)
var places = [Place]()
let task = URLSession.shared.dataTask(with: request as URLRequest) {data,response,error in
guard error == nil && data != nil else {
print ("Error:",error)
return
}
let httpStatus = response as? HTTPURLResponse
if httpStatus?.statusCode == 200
{ if data?.count != 0
{
let responseString = try! JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! NSDictionary
let contacts = responseString["Sheet1"] as? [AnyObject]
for contact in contacts!{
var places = [Place]()
let title = contact["name"] as! String
let subtitle = contact["description"] as? String
let latitude = contact["latitude"] as? Double ?? 0, longitude = contact["longitude"] as? Double ?? 0
let place = Place(title:title,subtitle:subtitle!,coordinate: CLLocationCoordinate2DMake(latitude, longitude))
places.append(place)
print(latitude)
print(place)
}
}
else {
print("No data got from url")
}
} else {
print("error httpsatus code is:", httpStatus!.statusCode)
}
}
task.resume()
return places as [Place]
}
}
I think the problem is this:
let place = Place(title:title,subtitle:subtitle!,coordinate: CLLocationCoordinate2DMake(latitude, longitude))
When I print(place) it returns the weird results
When you make a class that subclasses from NSObject you're creating a object that is backed by an Objective-c class -- which in some circumstances can be really useful (most common use is when you want to take your object and archive it as a blob of binary data).
I'm guessing that in your case, you probably don't want/need to subclass NSObject.
Here's a simplified example to show what's happening:
Here's a class backed by NSObject:
#objc class ObjCPlace: NSObject {
let name: String
init(name: String) {
self.name = name
}
}
If you create an instance of this object and try to print contents - like you've found, you get the objects location in memory:
let testObjcPlace = ObjCPlace(name: "New York")
print(testObjcPlace)
// prints:
// <__lldb_expr_310.ObjCPlace: 0x600000055060>
On alternative to using print could be to use dump that provides a more detailed look at your object:
let testObjcPlace = ObjCPlace(name: "New York")
dump(testObjcPlace)
// Prints:
// ▿ <__lldb_expr_310.ObjCPlace: 0x600000055060> #0
// - super: NSObject
// - name: "New York"
But instead of making an NSObject subclass, you probably just want to make a Swift class (or in this example a struct take a look at this question and answers for explanations of the differences)
struct Place {
let name: String
init(name: String) {
self.name = name
}
}
Because this object isn't an Objective-c object you can use print and get the internal properties printed as well:
let testPlace = Place(name: "New York")
print(testPlace)
// Prints:
// Place(name: "New York")
p/s welcome to StackOverflow!
I don't understand how to get array from dictionary, i have tried in this code but i want get array only content and type
This is my array
{
wsResponse = {
aarti =(
{
content = "";
identifier = "slok_one";
title = 1;
type = "\U092d\U0915\U094d\U0924\U093e\U092e\U0930";
},
{
content = "";
identifier = "slok_two";
title = 2;
type = "\U092d\U0915\U094d\U0924\U093e\U092e\U0930";
},
{
content = "";
identifier = "slok_three";
title = 3;
type = "\U092d\U0915\U094d\U0924\U093e\U092e\U0930";
}
}
);
};
Here is my code
Alamofire.request(url, method: .get, parameters: nil, encoding: JSONEncoding.default)
.responseJSON { response in
if let status = response.response?.statusCode {
switch(status){
case 201:
print("example success")
default:
print("error with response status: \(status)")
}
}
//to get JSON return value
if let array = response.result.value
{
let JSON = array as! NSDictionary
print("\(JSON)")
let response = JSON["wsResponse"] as! NSDictionary
let data = response["aarti"]
}
}
i want array from this ,like content,title,type
thank you in advance
According to the JSON this prints all values in the aarti array:
if let JSON = response.result.value as? [String:Any] {
if let response = JSON["wsResponse"] as? [String:Any],
let aarti = response["aarti"] as? [[String:Any]] {
for item in aarti {
let content = item["content"] as! String
let identifier = item["identifier"] as! String
let title = item["title"] as! Int
let type = item["type"] as! String
print(content, identifier, title, type)
}
}
}
Basically do not use NSDictionary / NSArray in Swift.
If you want to put all content values in an array use flatMap. The line can replace the whole repeat loop.
let contentArray = aarti.flatMap { $0["content"] as? String }
PS: If you are going to create multiple arrays from the values don't do that: Use a custom struct or class
if someone want to get dictionary of array and use it in tableview
declaration:
var list:[Any] = []
and initialisation :
self.list = (self.ListDic?["data"] as! NSArray!) as! [Any]
and use:
let dictObj = self.list[indexPath.row] as! NSDictionary
print("object value: ",dictObj["text"] as! String)
[{"name":"Air Elemental","toughness":"4","printings":["LEA","BTD","7ED","8ED","9ED","10E","DD2","M10","DPA","ME4","DD3_JVC"]}]
I have a JSON where there is an array in each listing called "printings" as seen below, how would I take this array out of each listing and convert it into a string like "LEA-BTD-7ED". Here is what I have so far but its crashing.
let err : NSErrorPointer?
let dataPath = NSBundle.mainBundle().pathForResource("cardata", ofType: "json")
let data : NSData = try! NSData(contentsOfFile: dataPath! as String, options: NSDataReadingOptions.DataReadingMapped)
do{
var contents = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.AllowFragments) as! [AnyObject]
for var i = 0;i<contents.count;++i{
let printing = contents[i]["printings"] as! String
}
}
Here's the code:
let path = dataPath!
if let JSONData = NSData(contentsOfFile: path)
{
do
{
if let dictionariesArray = try NSJSONSerialization.JSONObjectWithData(JSONData, options: NSJSONReadingOptions()) as?
[[String: AnyObject]]
{
for dictionary in dictionariesArray
{
if let printingsArray = dictionary["printings"] as? [String]
{
let printingsString = printingsArray.joinWithSeparator("-")
print(printingsString)
}
}
}
}
catch
{
print("Could not parse file at \(path)")
}
}
Executing it prints "LEA-BTD-7ED-8ED-9ED-10E-DD2-M10-DPA-ME4-DD3_JVC"
You can't cast an Array (contents[i]["printings"]) to a String. What you want is Array's joinWithSeparator() method, like this:
let printing = contents[i]["printing"] as! Array
let printingStr = printing.joinWithSeparator("-")
(Actually, I'm not sure whether you need the as! Array; try it without it.)
I am trying to get items from an api (JSON) and to parse it into a predefined swift array. I have searched and looked for hours but due to my lack of skills I wasn't able to find anything suitable my case.
My predefined array looks like this:
init?(participants: String, photoguest: UIImage?, photohome: UIImage?, time: String, stadium: String, channel: String)
the JSON structure is like this(entire json file):
{"gameId":"255","gameWeek":"17","gameDate":"2016-01-03","awayTeam":"SEA","homeTeam":"ARI","gameTimeET":"4:25 PM","tvStation":"FOX","winner":"SEA"}
My current code looks like this (Games is the class where I connect variables from array with table cell items):
var gameplan = [Games]()
func loadNFLgames(){
let apiURL = NSURL(string: "http://www.fantasyfootballnerd.com/service/schedule/json/test/")
let data: AnyObject? = NSData(contentsOfURL: apiURL!)
let homeTeam = (data as! NSDictionary)["homeTeam"] as! String
let awayTeam = (data as! NSDictionary)["awayTeam"] as! String
let gameDate = (data as! NSDictionary)["gameDate"] as! String
let gameTimeET = (data as! NSDictionary)["gameTimeET"] as! String
let tvStation = (data as! NSDictionary)["tvStation"] as! String
/*
for schleife mit API daten:
for gameWeek = currentWeek{ //every game where gameWeek matches currentWeek
*/
// create variables from api calls
let api_guest = awayTeam
let api_home = homeTeam
let api_tvhost = tvStation
let api_time = gameDate + ", " + gameTimeET + " ET" // convert gameDate to day e.g. SUN
let api_stadion = "N/A"
// prepare data for array
let gamedata = Games(participants: api_guest+" # "+api_home, photoguest: UIImage(named: api_guest), photohome: UIImage(named: api_home), time: api_time, stadium: api_stadion, channel: api_tvhost)!
// add data to array
gameplan.append(gamedata)
}
I am getting the following error:
Could not cast value of type '_NSInlineData' (0x1a0cfd428) to
'NSDictionary' (0x1a0cf3380).
EDIT: The error is being thrown here:
let homeTeam = (data as! NSDictionary)["homeTeam"] as! String
Your help is highly appreciated.
Thanks in advance!
hello your data variable doesn't contain the Json you r looking for. so you have to serialize it to json like alexander suggested but NSJSONSerialization can throw an error so we have tu put in in try
so your code will be something like this (i suggest always using dispatch_async to make it in background thread than use the completion closure to get your result)-->
func loadNFLgames(completionClosure: (result : [Games]) ->()){
let queue: dispatch_queue_t = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
dispatch_async(queue, {
let URL = "http://www.fantasyfootballnerd.com/service/schedule/json/test/"
print(URL)
if let data = NSData(contentsOfURL: NSURL(string: URL)!){
if let JsonObject = try? NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers) as! NSMutableDictionary{
print(JsonObject)
//here you can loop through the JsonObject to get the data you are looking for
//when you get your array of Games just pass it the the completion closure like this
completionClosure(result: gameplan)
}
}
})
}
PS: please let me know if you need more help.
Your data variable is NSData type (not NSDictionary). You have to convert it in order to use it. Try something like that:
let decodedJson = NSJSONSerialization.JSONObjectWithData(data, options: nil) as! NSDictionary
And than you can use it like standard dictionary
let homeTeam = decodedJson["homeTeam"] as! String