I am stuck with parsing JSON with AlamoFire and SwiftyJSON for iOS. I have a JSON such as this one:
[{"id":23561,"name":"RFI - Persan رادیو صدای Ùرانسه Ùارسی","country":"FR","image":{"url":null,"thumb":{"url":null}},"slug":"rfi-persan-رادیو-صدای-Ùرانسه-Ùارسی","website":"rfi","twitter":"","facebook":"","categories":[{"id":21,"title":"News","description":"","slug":"news","ancestry":"4"}],"streams":[{"stream":"http://rfi-persan.scdn.arkena.com/rfienpersan.mp3","bitrate":0,"content_type":"audio/mpeg","status":1}],"created_at":"2016-01-12T07:52:08+01:00","updated_at":"2016-08-02T01:52:50+02:00"}]
This is what I´ve tried so far, but doesn't work:
func loadSomeJSONData() {
Alamofire.request(.GET, "http://example.com/json/")
.responseJSON { (_, _, data, _) in
let json = JSON(data!)
if let Name = json["name"].string {
println("name: \(firstName)") // Name should equal "RFI"
}
}
}
But for some reason it doesn't get name from json object.
Thank you very much!
Your json is Array not Dictionary, so access the json this way
if let arr = json.arrayObject as? [[String:AnyObject]] {
if let name = arr[0]["name"] as? String {
println("name: \(name)") // Name should equal "RFI"
}
}
Related
I use alamofire for requests. Here on a simple response, I'm getting this JSON string from alamofire
Optional("[{\"nl2br\":\"2019-05-02 19:52:10\",\"nl3br\":\"\",\"nl4br\":\"#lxr\",\"nl5br\":\"1\",\"nl6br\":\"nein\",\"nl7br\":\"bARxrdw9c7WS1RN9c\\/\\/MrA==822b5dd20cb73611:35cab43d0c7e82e73c62818d9f90cfe8\",\"nl8br\":\"tBDSzkQ7eCNERwldgZiwKg==a7590d9d8affdbe5:63b9a9bf6421ea7db2a55f8773990b08\",\"nl9br\":\"fpd17pxVUzcJWNskVWyBeA==cf21783de8334248:a93e8b8a92ef9b238b75ad87a315ce3e\"},{\"nl2br\":\"2019-04-26 21:36:32\",\"nl3br\":\"old\",\"nl4br\":\"\",\"nl5br\":null,\"nl6br\":\"ja\",\"nl7br\":\"emjUIzK92fWwHNLv\\/4xv2Q==8fca202c9a816c7b:655ef8aaaa0212bb9e77a9c35a56c3a7\",\"nl8br\":\"1C5Hy\\/ZhMk3b6SZY8c08lw==cb3b0f4fdd6b5957:034e72d400598fedc43b3111d841a31b\",\"nl9br\":\"KUfLHbih9612dhNCYPOrTg==48da9c3362430e01:3a80ba9fb516e4172aa39b017abcd96e\"},{\"nl2br\":\"2019-04-26 21:20:24\",\"nl3br\":\"holder\",\"nl4br\":\"\",\"nl5br\":null,\"nl6br\":\"ja\",\"nl7br\":\"J59nMBWUMyU9PzdbwQqd0g==f7d3c6c561c33f0b:3465e9131a2577c39cddcc606d0785b0\",\"nl8br\":\"G4rRevk951ZBJJQKzBeJZg==45c0ebcdc1e000e8:dc770c3849fef8b058f85cad42c73e1d\",\"nl9br\":\"338Ud9CIDgnyBV96F2Fx\\/w==d0f825064e0ecf81:0ca00ff27e977ef5f8123d38c643a8b3\"},{\"nl2br\":\"2019-04-10 23:57:17\",\"nl3br\":\"\",\"nl4br\":\"Wasmes, here\'s a video and do ya need?\",\"nl5br\":\"1\",\"nl6br\":\"ja\",\"nl7br\":\"fw17O1L9SuO9FS3qu6U7QQ==706bd09ee3b5ec55:6667d9020a0edcacbd217f631d2305c0\",\"nl8br\":\"2tTE9+0Kr6cVSuEOsq8h0w==3e0e46352da323be:941710bd881546dfa08d3afb6aea2831\",\"nl9br\":\"NAkMx0OsKwXVGndYXbAFmA==1234c0b2992502bf:666f8efd3bdf8ee8b0a2ee4e7222c2ef\"},{\"nl2br\":\"2019-02-22 21:38:16\",\"nl3br\":\"i\'m giving up on you, but don\'t \",\"nl4br\":\"\",\"nl5br\":null,\"nl6br\":\"nein\",\"nl7br\":\"gOv13Dsxf1N2UG46KT3tvQ==dd02a83b1837bb24:4f7c7ab95e873d35685ab7b738626f44\",\"nl8br\":\"40+GOpcNU6M4F688DJyxFA==70bc177842f3f6cf:232b065423bd2683d75ca177775fd352\",\"nl9br\":\"mBc3pEHKBiiPeAEpZRskug==71b353fed6403b99:c58099676beacc146c14867645e29783\"}]")
I get my data like this and convert it like this
if let responseData = response.data {
let responseDataString = String(data: responseData, encoding:String.Encoding(rawValue: String.Encoding.utf8.rawValue))
print(responseDataString) // gives the whole string above
if let obj = responseDataString?.toJSON() as? [String:AnyObject] {
print(obj["nl2br"] as! String) // gives nothing, just nil
}
}
My string extension is like this.
extension String {
func toJSON() -> Any? {
guard let data = self.data(using: .utf8, allowLossyConversion: false) else { return nil }
return try? JSONSerialization.jsonObject(with: data, options: .mutableContainers)
}
}
Any idea why this behaviour is expected? I tried printing obj that gives nothing too.
Your root is an array not a dictionary Change responseDataString?.toJSON() as? [[String:Any]]
extension String {
func toJSON() -> Any? {
return try? JSONSerialization.jsonObject(with: Data(self.utf8))
}
}
let responseDataString:String? = """[{\"nl2br\":\"2019-05-02 19:52:10\",\"nl3br\":\"\",\"nl4br\":\"#lxr\",\"nl5br\":\"1\",\"nl6br\":\"nein\",\"nl7br\":\"bARxrdw9c7WS1RN9c\\/\\/MrA==822b5dd20cb73611:35cab43d0c7e82e73c62818d9f90cfe8\",\"nl8br\":\"tBDSzkQ7eCNERwldgZiwKg==a7590d9d8affdbe5:63b9a9bf6421ea7db2a55f8773990b08\",\"nl9br\":\"fpd17pxVUzcJWNskVWyBeA==cf21783de8334248:a93e8b8a92ef9b238b75ad87a315ce3e\"},{\"nl2br\":\"2019-04-26 21:36:32\",\"nl3br\":\"old\",\"nl4br\":\"\",\"nl5br\":null,\"nl6br\":\"ja\",\"nl7br\":\"emjUIzK92fWwHNLv\\/4xv2Q==8fca202c9a816c7b:655ef8aaaa0212bb9e77a9c35a56c3a7\",\"nl8br\":\"1C5Hy\\/ZhMk3b6SZY8c08lw==cb3b0f4fdd6b5957:034e72d400598fedc43b3111d841a31b\",\"nl9br\":\"KUfLHbih9612dhNCYPOrTg==48da9c3362430e01:3a80ba9fb516e4172aa39b017abcd96e\"},{\"nl2br\":\"2019-04-26 21:20:24\",\"nl3br\":\"holder\",\"nl4br\":\"\",\"nl5br\":null,\"nl6br\":\"ja\",\"nl7br\":\"J59nMBWUMyU9PzdbwQqd0g==f7d3c6c561c33f0b:3465e9131a2577c39cddcc606d0785b0\",\"nl8br\":\"G4rRevk951ZBJJQKzBeJZg==45c0ebcdc1e000e8:dc770c3849fef8b058f85cad42c73e1d\",\"nl9br\":\"338Ud9CIDgnyBV96F2Fx\\/w==d0f825064e0ecf81:0ca00ff27e977ef5f8123d38c643a8b3\"},{\"nl2br\":\"2019-04-10 23:57:17\",\"nl3br\":\"\",\"nl4br\":\"Wasmes, here\'s a video and do ya need?\",\"nl5br\":\"1\",\"nl6br\":\"ja\",\"nl7br\":\"fw17O1L9SuO9FS3qu6U7QQ==706bd09ee3b5ec55:6667d9020a0edcacbd217f631d2305c0\",\"nl8br\":\"2tTE9+0Kr6cVSuEOsq8h0w==3e0e46352da323be:941710bd881546dfa08d3afb6aea2831\",\"nl9br\":\"NAkMx0OsKwXVGndYXbAFmA==1234c0b2992502bf:666f8efd3bdf8ee8b0a2ee4e7222c2ef\"},{\"nl2br\":\"2019-02-22 21:38:16\",\"nl3br\":\"i\'m giving up on you, but don\'t \",\"nl4br\":\"\",\"nl5br\":null,\"nl6br\":\"nein\",\"nl7br\":\"gOv13Dsxf1N2UG46KT3tvQ==dd02a83b1837bb24:4f7c7ab95e873d35685ab7b738626f44\",\"nl8br\":\"40+GOpcNU6M4F688DJyxFA==70bc177842f3f6cf:232b065423bd2683d75ca177775fd352\",\"nl9br\":\"mBc3pEHKBiiPeAEpZRskug==71b353fed6403b99:c58099676beacc146c14867645e29783\"}]"""
if let obj = responseDataString?.toJSON() as? [[String:Any]] {
obj.forEach {
print($0["nl2br"])
}
}
Result
Optional(2019-05-02 19:52:10)
Optional(2019-04-26 21:36:32)
Optional(2019-04-26 21:20:24)
Optional(2019-04-10 23:57:17)
Optional(2019-02-22 21:38:16)
Edit: In json this
[{
"name":"ppp"
}]
is an array of dictionaries to be [[String:Any]] notice nested [[]] , while this
{
"name":"ppp"
}
is a dictionary represented by [String:Any] notice only []
I'm new to using Alamofire and have encountered an issue. I'm able to run the following code to print out all the data from an API endpoint.
Alamofire.request("http://codewithchris.com/code/afsample.json").responseJSON { response in
if let JSON = response.result.value {
print(JSON)
}
}
The issue is that when I run this:
Alamofire.request("http://codewithchris.com/code/afsample.json").responseJSON { response in
if let JSON = response.result.value {
print(JSON["firstkey"])
}
}
I get the error:
Type 'Any' has no subscript members
I don't know why this error is happening, it seems as if I'm accessing the data correctly. Any help would be great, thanks!
I have tried formatting it using both:
print(JSON["firstkey"] as String)
and
print(JSON["firstkey"] as [String:Any]
but they still give the same error.
This is the JSON on my endpoint:
{
"firstkey":"it worked!",
"secondkey":["item1", "item2", "item3"]
}
This is really simple. You just need to force cast (as!) your JSON. so change your code to this and it will work:
Alamofire.request("http://codewithchris.com/code/afsample.json").responseJSON { response in
if let JSON = response.result.value {
let json = JSON as! [String: Any]
print(json["firstkey"])
}
}
Edit 1:
As you said in comments that you are using SwiftyJSON package. Sample code is as follows:
Alamofire.request("http://codewithchris.com/code/afsample.json").responseJSON { response in
if let value = response.result.value {
let json = JSON(value)
print(json["firstkey"].stringValue)
}
}
Alamofire.request("https://mmcalc.com/api").responseJSON { response in
if let value = response.result.value {
let json = JSON(value)
print(json.arrayValue[0]["uniqueUsers"].stringValue)
}
}
You are trying to get the value with getting the object, try this:
Alamofire.request("http://codewithchris.com/code/afsample.json").responseJSON { response in
if let result = response.result.value {
let JSON = result as! NSDictionary
print(JSON["firstkey"])
}
}
Hope it will work!
You should add ! at the end of code before ) to force unwrap the value
Alamofire.request("http://codewithchris.com/code/afsample.json").responseJSON { response in
if let JSON = response.result.value {
let json = JSON as! [String: Any]
print(json["firstkey"]!)
}
}
I'm trying to parse a JSON string returned from a new API. The returned JSON string looks like this.
QuerySearchResult":{
"StartAt":"1",
"Count":"40",
"TotalAvailable":"500",
"Items":[
{"TITLE":"OST420 Generation",
"PATH":"http:\\Test.pdf",
"WRITE":"2016-12-12T15:47:42",
"RANK":"32286574",
"SIZE":"145091",
"ISDOCUMENT":"true",
"ID":"18548",
"WPTASK":"Onsite Generation",
"WPDOCTYPE":"Local Operating Procedure",
"WPDOCREFID":"304580",
"WPCONTENTTYPE":"Document"},
{"TITLE":"OST420 Measurement",
"PATH":"http:\Test33.pdf",
.
.
I'm using the code below which accepts the JSON variable but fails when I try to load item. I've tried using Array around Dictionary but it still fails. What declaration do I need to read in Items?
if let json = try JSONSerialization.jsonObject(with: data!, options:.allowFragments) as? Dictionary<String, AnyObject> {
for item in json {
if let dict = item as? Dictionary<String, AnyObject> {
if let items = json["Items"] as? Array<Dictionary<String, AnyObject>> {
for rec in items {
if let title = rec["TITLE"] as? String {
let xx = title
}
}
}
}
}
First of all you are not correctly iterating through Dictionary also instead of looping through Dictionary for accessing single value, try by directly accessing it through subscripting and the proper JSON notation of Dictionary in Swift 3 is [String : Any].
if let json = try? JSONSerialization.jsonObject(with: data!, options: []) as? [String : Any],
let queryDic = json["QuerySearchResult"] as? [String : Any],
let items = queryDic["Items"] as? [[String : Any]] {
for item in items {
if let title = item["TITLE"] as? String {
print(title)
}
}
}
In Swift 3.1 :-
func parseJson(anyObj:AnyObject) {
if let anyObj = anyObj as? Array<Dictionary<String,AnyObject>> {
self.yourArrayName = anyObj.flatMap({yourModelName(json:$0) })
}
}
The Json returns the data into the dictionary and array format, so treat the json data like it, it makes you easier to understand.
Data in braces '{' and '}' is dictionary.
and Data in braces '[' or ']' is array.
Now start parsing the json data by the dictionary and array properties it exactly works. Or for confirmation print your json data.
Use SwiftyJSON : which can simply and easily parse the JSON more than your code.
So, how do we parse using that?
First get your response as Data()
let jsonData = JSON(data: results!)
Then here how we parse that JSON.
import Foundation
import SwiftyJSON
enum JSONParseError : ErrorType {
case UnknownField
case EmptyJSON
}
extension JSONParseError : CustomStringConvertible {
var description: String {
switch self {
case .UnknownField:
return "Error when parsing json because there is no field"
case .EmptyJSON:
return "Error when parsing empty json"
}
}
}
guard let querySearchResult : [String : JSON] = jsonData["QuerySearchResult"].dictionary else{
throw JSONParseError.UnknownField
}
guard let startAt : String = querySearchResult["StartAt"].string else{
throw JSONParseError.UnknownField
}
guard let count : String = querySearchResult["Count"].string else{
throw JSONParseError.UnknownField
}
guard let totalAvailable : String = querySearchResult["TotalAvailable"].string else{
throw JSONParseError.UnknownField
}
guard let items : [JSON] = querySearchResult["Items"].array else{
throw JSONParseError.UnknownField
}
if items.count > 0 {
for i in 0 ..< items.count{
guard let title = items[i]["TITLE"].string else{
throw JSONParseError.UnknownField
}.... //So On
}
}else{
throw JSONParseError.EmptyJSON
}
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?
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)")
}
}
}
}
}
}
}
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"
}
}
}
}
}
You have to specify the type of your expected value (With SwiftyJSON):
for entry in JSON["entries"] { // Here
print(entry.stringValue)
}
The issue is i am not able to populate an array with what I thought would be correct code to parse a JSON file with swiftyJSON.
As well as I am not sure if the process at which i send the request is correct.
JSON format: this should be simplified to what it truly represents: A dictionary with a "string" key and value of an array of dictionaries. then a string key with a value of a dictionary. then a string with a value of a string which i need.
{
"string1" : [
{ "string2" : {
"string3" : "DataINeed"
}
}
]
}
my code
func downloadSecondJSONData(completed: DownloadComplete)
{
let API_ServerKey = "My API Key"
let URL_Search = "URL Address"
let urlString = "\(URL_Search)"
let url = NSURL(string: urlString)!
Alamofire.request(.GET,url).responseJSON { (response) -> Void in
switch response.result
{
case .Success:
if let value = response.result.value
{
let json = JSON(value)
if let data = json["string1"]["string2"]["string3"].string
{
self.dataArray.append(data)
}
}
case .Failure(let error):
print(error)
}
completed()
}
}
func printData()
{
print(self.dataArray.count)
}
How I am attempting to call the methods
downloadFirstJSONData { () -> () in
self.randomMethod() //data i use with the downloadFirstJSONData is required to use in the downloadSecondJSONData
self.downloadSecondJSONData({ () -> () in
self.printData() //check if data has been stored
})
}
Looks like you're not accessing the array after the first dictionary.
I guess the safe way to access the first object would be:
if let array = json["string1"].array,
let firstDict = array.first,
let data = firstDict["string2"]["string3"].string {
self.dataArray.append(data)
}
But I suppose with SwiftyJSON you can also do a variation of what you had:
if let data = json["string1"][0]["string2"]["string3"].string {
self.dataArray.append(data)
}