I'm trying to get JSON but it shows an occurred issue
Line starting with if let deliveryObject
How to get rid of the problem?
code:
struct Tracking {
let receiver: String
let placeOfMail: String
let indexOfMail: Double
init(json:[String:Any]) throws {
guard let receiver = json["name"] as? String else {
throw SerializationError.missing("Receiver data has been missed")
}
guard let placeOfMail = json ["address"] as? String else {
throw SerializationError.missing("Place of delivery has been missed")
}
guard let indexOfMail = json ["postindex"] as? Double else {
throw SerializationError.missing("Index of postmail has been missed")
}
self.receiver = receiver
self.placeOfMail = placeOfMail
self.indexOfMail = indexOfMail
}
static let basePath = "https://track.kazpost.kz/api/v2/"
static func deliveryData (withTrackid trackid:String, completion: #escaping ([Tracking]) -> ()){
let url = basePath + trackid
let request = URLRequest(url: URL(string: url)!)
let task = URLSession.shared.dataTask(with: request) { (data: Data?, response : URLResponse?, error: Error?) in
var deliveryArray: [Tracking] = []
if let data = data {
do {
if let json = try JSONSerialization.jsonObject(with: data, options:[]) as? [String:Any] {
if let deliveryInformation = json ["delivery"] as? [String:Any] {
if let deliveryPlace = deliveryInformation ["address"] as? [String:Any] {
for dataPoint in deliveryPlace {
if let dataPointValue = dataPoint.value as? [String: AnyObject],
let deliveryObject = try Tracking(json: dataPointValue) {
deliveryArray.append(deliveryObject)
}
}
}
}
}
}catch {
print(error.localizedDescription)
}
completion(deliveryArray)
}
}
task.resume()
}
}
Related
hello i am working with swift 6.2 ( the performance of my pc doesn't support ++)
i have copied from open classroom this program in my file but there are many errors
i just want to know if it is just problem of swift compatibility or there are really errors in the code
//****************
import UIKit
class QuestionManager {
private let url = URL(string: "https://opentdb.com/api.php?amount=10&type=boolean")!
// exemple of message error: use of unresolved identifier 'URL'
static let shared = QuestionManager()
private init() {}
// FIX IT : replace static with class ...
// AND LOT OF MESSAGE ERROR LIKE THIS...
func get(completionHandler: #escaping ([Question]) -> ()) {
let task = URLSession.shared.dataTask(with: self.url) { (data, response, error) in
guard error == nil else {
completionHandler([Question]())
return
}
DispatchQueue.main.async {
completionHandler(self.parse(data: data))
}
}
task.resume()
}
private func parse(data: Data?) -> [Question] {
guard let data = data,
let serializedJson = try? JSONSerialization.jsonObject(with: data, options: []),
let parsedJson = serializedJson as? [String: Any],
let results = parsedJson["results"] as? [[String: Any]] else {
return [Question]()
}
return getQuestionsFrom(parsedDatas: results)
}
private func getQuestionsFrom(parsedDatas: [[String: Any]]) -> [Question]{
var retrievedQuestions = [Question]()
for parsedData in parsedDatas {
retrievedQuestions.append(getQuestionFrom(parsedData: parsedData))
}
return retrievedQuestions
}
private func getQuestionFrom(parsedData: [String: Any]) -> Question {
if let title = parsedData["question"] as? String,
let answer = parsedData["correct_answer"] as? String {
return Question(title: String(htmlEncodedString: title)!, isCorrect: (answer == "True"))
}
return Question()
}
}
extension String {
init?(htmlEncodedString: String) {
guard let data = htmlEncodedString.data(using: .utf8) else {
return nil
}
let options: [NSAttributedString.DocumentReadingOptionKey: Any] = [
NSAttributedString.DocumentReadingOptionKey.documentType: NSAttributedString.DocumentType.html,
NSAttributedString.DocumentReadingOptionKey.characterEncoding: String.Encoding.utf8.rawValue
]
guard let attributedString = try? NSAttributedString(data: data, options: options, documentAttributes: nil) else {
return nil
}
self.init(attributedString.string)
}
}
To get a direct link to YouTube video I made request to get the get_video_info file, in this file that link, but I have to parse it, I find the solution to parse it by PHP but I want to parse it directly from my App
I get the data from my code like this:
let youtubeContentID = "sZz7tiToK1U"
if let infoURL = URL(string:"https://www.youtube.com/get_video_info?video_id=\(youtubeContentID)") {
let request = URLRequest(url: infoURL)
let session = URLSession(configuration: .default)
let task = session.dataTask(with: request, completionHandler: { (data, response, error) -> Void in
if let error = error {
print(error)
} else if let data = data, let result = NSString(data: data, encoding: String.Encoding.utf8.rawValue) {
print(result)
}
})
task.resume()
}
}
I got data with many Ascii symbols like this:
c=WEB&vss_host=s.youtube.com&innertube_api_version=v1&xhr_apiary_host=youtubei.youtube.com&apiary_host_firstparty=&status=ok&t=1&enabled_engage_types=3%2C6%2C4%2C5%2C17%2C1&ssl=1&adaptive_fmts=type%3Dvideo%252Fwebm%253B%2Bcodecs%253D%2522vp9%2522%26eotf%3Dbt709%26projection_type%3D1%26lmt%3D1550114115045036%26bitrate%3D16962786%26size%3D3840x2160%26index%3D221-1771%26quality_label%3D2160p%26xtags%3D%26url%3Dhttps%253A%252F%252Fr2---sn-nuj-wxqek.googlevideo.com%252Fvideoplayback%253Fexpire%253D1551500605%2526usequic%253Dno%2526gir%253Dyes%2526mime%253Dvideo%25252Fwebm%2526requiressl%253Dyes%2526keepalive%253Dyes%2526fvip%253D2%2526clen%253D547103152%2526source%253Dyoutube%2526aitags%253D133%25252C134%25252C135%25252C136%25252C137%25252C160%25252C242%25252C243%25252C244%25252C247%25252C248%25252C271%25252C278%25252C313%25252C394%25252C395%25252C396%25252C397%2526signature%253D9C28A5C103FA95701CD3655795DDB7F2C0954828.55534AC9C7BEE5D644C3A34C2CD4A4EEC9E2FD38%2526lmt%253D1550114115045036%2526ip%253D129.208.30.232%2526key%253Dyt6%2526c%253DWEB%2526ei%253D3bB5XKeFFNWd1wbBpqjgAg%2526txp%253D5531432%2526id%253Do-AIOVogCB8KFe32o_VgxSx-LqaEjNBZxiZ1jl81VTXZhF%2526sparams%253Daitags%25252Cclen%25252Cdur%25252Cei%25252Cgir%25252Cid%25252Cinitcwndbps%25252Cip%25252Cipbits%25252Citag%25252Ckeepalive%25252Clmt%25252Cmime%25252Cmm%25252Cmn%25252Cms%25252Cmv%25252Cpl%25252Crequiressl%25252Csource%25252Cusequic%25252Cexpire%2526initcwndbps%253D296250%2526itag%253D313%2526ms%253Dau%25252Crdu%2526mt%253D1551478917%2526mv%253Dm%2526dur%253D428.933%2526pl%253D19%2526ipbits%253D0%2526mm%253D31%25252C29%2526mn%253Dsn-nuj-wxqek%25252Csn-hgn7yn7l%26clen%3D547103152%26init%3D0-220%26itag%3D313%26primaries%3Dbt709%26fps%3D30%2Ctype%3Dvideo%252Fwebm%253B%2Bcodecs%253D%2522vp9%2522%26eotf%3Dbt709%26projection_type%3D1%26lmt%3D1550113771564979%26bitrate%3D6318874%26size%3D2560x1440%26index%3D220-1763%26quality_label%3D1440p%26xtags%3D%26url%3Dhttps%253A%252F%252Fr2---sn-nuj-wxqek.googlevideo.com%252Fvideoplayback%253Fexpire%253D1551500605%2526usequic%253Dno%2526gir%253Dyes%2526mime%253Dvideo%25252Fwebm%2526requiressl%253Dyes%2526keepalive%253Dyes%2526fvip%253D2%2526clen%253D155020170%2526source%253Dyoutube%2526aitags%253D133%25252C134%25252C135%25252C136%25252C137%25252C160%25252C242%25252C243%25252C244%25252C247%25252C248%25252C271%25252C278%25252C313%25252C394%25252C395%25252C396%25252C397%2526signature%253D4D7BF761EE4A6DFD048DE3D48550FCE80E61B7D0.D625BCC9645471ABA478F79C197B2208F354E15F%2526lmt%253D1550113771564979%2526ip%253D129.208.30.232%2526key%253Dyt6%2526c%253DWEB%2526ei%253D3bB5XKeFFNWd1wbBpqjgAg%2526txp%253D5531432%2526id%253Do-AIOVogCB8KFe32o_VgxSx- .... ext
I find code can deal with this YouTube request, it created on 2015 so it can't run on the new Swift, so I edited it to work on Swift 4, just copy this code in side a new Swift file then call function h264videosWithYoutubeID(youtubeID: your TouTube ID) and you will get the correct url:
import UIKit
public extension NSURL {
func dictionaryForQueryString() -> [String: AnyObject]? {
if let query = self.query {
return query.dictionaryFromQueryStringComponents()
}
let result = absoluteString?.components(separatedBy: "?")
if result!.count > 1 {
return result!.last?.dictionaryFromQueryStringComponents()
}
return nil
}
}
public extension NSString {
func stringByDecodingURLFormat() -> String {
let result = self.replacingOccurrences(of: "+", with: " ")
return result.removingPercentEncoding!
}
func dictionaryFromQueryStringComponents() -> [String: AnyObject] {
var parameters = [String: AnyObject]()
for keyValue in components(separatedBy: "&") {
let keyValueArray = keyValue.components(separatedBy: "=")
if keyValueArray.count < 2 {
continue
}
let key = keyValueArray[0].stringByDecodingURLFormat()
let value = keyValueArray[1].stringByDecodingURLFormat()
parameters[key] = value as AnyObject
}
return parameters
}
}
public class YoutubeUrlReciver: NSObject {
static let infoURL = "http://www.youtube.com/get_video_info?video_id="
static var userAgent = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/537.4 (KHTML, like Gecko) Chrome/22.0.1229.79 Safari/537.4"
public static func youtubeIDFromYoutubeURL(youtubeURL: NSURL) -> String? {
if let
youtubeHost = youtubeURL.host,
let youtubePathComponents = youtubeURL.pathComponents {
let youtubeAbsoluteString = youtubeURL.absoluteString
if youtubeHost == "youtu.be" as String? {
return youtubePathComponents[1]
} else if youtubeAbsoluteString?.range(of: "www.youtube.com/embed") != nil {
return youtubePathComponents[2]
} else if youtubeHost == "youtube.googleapis.com" ||
youtubeURL.pathComponents!.first == "www.youtube.com" as String? {
return youtubePathComponents[2]
} else if let
queryString = youtubeURL.dictionaryForQueryString(),
let searchParam = queryString["v"] as? String {
return searchParam
}
}
return nil
}
public static func h264videosWithYoutubeID(youtubeID: String) -> [String: AnyObject]? {
let urlString = String(format: "%#%#", infoURL, youtubeID) as String
let url = NSURL(string: urlString)!
let request = NSMutableURLRequest(url: url as URL)
request.timeoutInterval = 5.0
request.setValue(userAgent, forHTTPHeaderField: "User-Agent")
request.httpMethod = "GET"
var responseString = NSString()
let session = URLSession(configuration: URLSessionConfiguration.default)
let group = DispatchGroup()
group.enter()
session.dataTask(with: request as URLRequest, completionHandler: { (data, response, _) -> Void in
if let data = data as NSData? {
responseString = NSString(data: data as Data, encoding: String.Encoding.utf8.rawValue)!
}
group.leave()
}).resume()
group.wait()
let parts = responseString.dictionaryFromQueryStringComponents()
if parts.count > 0 {
var videoTitle: String = ""
var streamImage: String = ""
if let title = parts["title"] as? String {
videoTitle = title
}
if let image = parts["iurl"] as? String {
streamImage = image
}
if let fmtStreamMap = parts["url_encoded_fmt_stream_map"] as? String {
// Live Stream
if let _: AnyObject = parts["live_playback"]{
if let hlsvp = parts["hlsvp"] as? String {
return [
"url": "\(hlsvp)" as AnyObject,
"title": "\(videoTitle)" as AnyObject,
"image": "\(streamImage)" as AnyObject,
"isStream": true as AnyObject
]
}
} else {
let fmtStreamMapArray = fmtStreamMap.components(separatedBy: ",")
for videoEncodedString in fmtStreamMapArray {
var videoComponents = videoEncodedString.dictionaryFromQueryStringComponents()
videoComponents["title"] = videoTitle as AnyObject
videoComponents["isStream"] = false as AnyObject
return videoComponents as [String: AnyObject]
}
}
}
}
return nil
}
public static func h264videosWithYoutubeURL(youtubeURL: NSURL,completion: ((
_ videoInfo: [String: AnyObject]?, _ error: NSError?) -> Void)?) {
DispatchQueue.global().async {
if let youtubeID = self.youtubeIDFromYoutubeURL(youtubeURL: youtubeURL), let videoInformation = self.h264videosWithYoutubeID(youtubeID: youtubeID) {
DispatchQueue.main.async {
completion?(videoInformation, nil)
}
}else{
DispatchQueue.main.async {
completion?(nil, NSError(domain: "com.player.youtube.backgroundqueue", code: 1001, userInfo: ["error": "Invalid YouTube URL"]))
}
}
}
}
}
Here is the API Call how can I pass a dictionary as the parameter to the URL which is a get request, Don't want to use Alamofire in this.
The URL is - http://mapi.trycatchtech.com/v1/naamkaran/post_list_by_cat_and_gender_and_page?category_id=3&gender=1&page=1
func getDisplayJsonData(url: String, parameters: [String: Any], completion: #escaping displayCompletionHandler) {
guard let url = URL(string: url) else {return}
URLSession.shared.dataTask(with: url) { (data, response, error) in
if error != nil {
debugPrint(error?.localizedDescription ?? "")
completion(nil)
return
} else {
guard let data = data else {return completion(nil)}
let decoder = JSONDecoder()
do{
let displayJson = try decoder.decode(Display.self, from: data)
completion(displayJson)
} catch{
debugPrint(error.localizedDescription)
completion(nil)
return
}
}
} .resume()
}
}
Where I am calling this function here and passing the dictionary values.
extension DisplayVC {
func getData() {
let params = ["category_id": categoryId, "gender": genderValue, "page": pageNumber] as [String : Any]
DisplayService.instance.getDisplayJsonData(url: BASE_URL, parameters: params) { (receivedData) in
print(receivedData)
}
}
}
SWIFT 4 / Xcode 10
If this the only case, a simple solution is:
func getDisplayJsonData(url: String, parameters: [String: Any], completion: #escaping displayCompletionHandler) {
var urlBase = URLComponents(string: url)
guard let catValue = parameters["category_id"] as? Int else {return}
guard let genderValue = parameters["gender"] as? Int else {return}
guard let pageValue = parameters["page"] as? Int else {return}
urlBase?.queryItems = [URLQueryItem(name: "category_id", value: String(catValue)), URLQueryItem(name: "gender", value: String(genderValue)), URLQueryItem(name: "page", value: String(pageValue))]
//print(urlBase?.url)
guard let urlSafe = urlBase?.url else {return}
URLSession.shared.dataTask(with: urlSafe) { (data, response, error) in
//Your closure
}.resume()
}
I am new to swift so please treat me as beginner.
I am following tutorial, this is pretty old tutorial and it has used GoogleMap framework whereas I am doing it with pod. In func geocodeAddress in MapTasks.swift file I am getting error called
Extra argument 'error' in call
func geocodeAddress(address: String!, withCompletionHandler completionHandler: ((status: String, success: Bool) -> Void)) {
if let lookupAddress = address {
var geocodeURLString = baseURLGeocode + "address=" + lookupAddress
geocodeURLString = geocodeURLString.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)!
let geocodeURL = NSURL(string: geocodeURLString)
dispatch_async(dispatch_get_main_queue(), { () -> Void in
let geocodingResultsData = NSData(contentsOfURL: geocodeURL!)
let request = NSMutableURLRequest(URL: geocodingResultsData)
let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
(let data, let response, let error) in
if let _ = response as? NSHTTPURLResponse {
do {
let json = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers) as? NSDictionary
if error != nil {
print("error=\(error!)")
return
}
if let parseJSON = json {
}
} catch {
print(error)
}
}
}
task.resume()
else {
// Get the response status.
let status = dictionary["status"] as! String
if status == "OK" {
let allResults = dictionary["results"] as! Array<Dictionary<NSObject, AnyObject>>
self.lookupAddressResults = allResults[0]
// Keep the most important values.
self.fetchedFormattedAddress = self.lookupAddressResults["formatted_address"] as! String
let geometry = self.lookupAddressResults["geometry"] as! Dictionary<NSObject, AnyObject>
self.fetchedAddressLongitude = ((geometry["location"] as! Dictionary<NSObject, AnyObject>)["lng"] as! NSNumber).doubleValue
self.fetchedAddressLatitude = ((geometry["location"] as! Dictionary<NSObject, AnyObject>)["lat"] as! NSNumber).doubleValue
completionHandler(status: status, success: true)
}
else {
completionHandler(status: status, success: false)
}
}
})
}
else {
completionHandler(status: "No valid address.", success: false)
}
}
So far I know is I am getting this error because of the diffrent version of swift. Tutorial I am following is written in old version of swift and I am doing it in new
In Swift 2.0, you cannot add 'error' argument in NSJSONSerialization method, you need to use try-catch statement as follows:
func geocodeAddress(address: String!, withCompletionHandler completionHandler: ((status: String, success: Bool) -> Void)) {
if let lookupAddress = address {
var geocodeURLString = baseURLGeocode + "address=" + lookupAddress
geocodeURLString = geocodeURLString.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)!
let geocodeURL = NSURL(string: geocodeURLString)
dispatch_async(dispatch_get_main_queue(), { () -> Void in
let geocodingResultsData = NSData(contentsOfURL: geocodeURL!)
let request = NSMutableURLRequest(URL: geocodeURL!)
let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
(let data, let response, let error) in
if let _ = response as? NSHTTPURLResponse {
do {
let dictionary = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers) as? NSDictionary
if error != nil {
print("error=\(error!)")
return
}
if let parseJSON = dictionary {
let status = dictionary["status"] as! String
if status == "OK" {
let allResults = dictionary["results"] as! Array<Dictionary<NSObject, AnyObject>>
self.lookupAddressResults = allResults[0]
// Keep the most important values.
self.fetchedFormattedAddress = self.lookupAddressResults["formatted_address"] as! String
let geometry = self.lookupAddressResults["geometry"] as! Dictionary<NSObject, AnyObject>
self.fetchedAddressLongitude = ((geometry["location"] as! Dictionary<NSObject, AnyObject>)["lng"] as! NSNumber).doubleValue
self.fetchedAddressLatitude = ((geometry["location"] as! Dictionary<NSObject, AnyObject>)["lat"] as! NSNumber).doubleValue
completionHandler(status: status, success: true)
}
else {
completionHandler(status: status, success: false)
}
}
} catch {
print(error)
}
}
}
task.resume()
})
}
}
I'm a C# developer convert to Swift tvOs and just starting to learn. I've made some progress, but not sure how to handle nested calls to json. The sources are from different providers so I can't just combine the query.
How do I wait for the inner request to complete so the TVSeries has the poster_path? Is there a better way to add the show to the collection and then process the poster path loading in another thread so it doesn't delay the UI Experience?
func downloadTVData() {
let url_BTV = NSURL(string: BTV_URL_BASE)!
let request_BTV = NSURLRequest(URL: url_BTV)
let session_BTV = NSURLSession.sharedSession()
//get series data
let task_BTR = session_BTV.dataTaskWithRequest(request_BTV) { (data_BTV, response_BTV, error_BTV) -> Void in
if error_BTV != nil {
print (error_BTV?.description)
} else {
do {
let dict_BTV = try NSJSONSerialization.JSONObjectWithData(data_BTV!, options: .AllowFragments) as? Dictionary<String, AnyObject>
if let results_BTV = dict_BTV!["results"] as? [Dictionary<String, AnyObject>]{
for obj_BTV in results_BTV {
let tvshow = TVSeries(tvDict: obj_BTV)
//for each tv series try to load a poster_path from secondary provider
if let str = obj_BTV["title"] as? String!{
let escapedString = str?.stringByAddingPercentEncodingWithAllowedCharacters(.URLQueryAllowedCharacterSet())!
if let url = NSURL(string: self.SEARCH_URL_BASE + escapedString!) {
let request = NSURLRequest(URL: url)
let session = NSURLSession.sharedSession()
let task = session.dataTaskWithRequest(request) { (data, response, error) -> Void in
if error != nil {
print (error?.description)
} else {
do {
let dict = try NSJSONSerialization.JSONObjectWithData(data!, options: .AllowFragments) as? Dictionary<String, AnyObject>
if let results = dict!["results"] as? [Dictionary<String, AnyObject>] {
//iterate through the poster array
for obj in results {
if let path = obj["poster_path"] as? String {
tvshow.posterPath = path
break
}
}
}
} catch let error as NSError {
print(error.description)
}
}
}
task.resume()
}
}
self.tvSeries.append(tvshow)
}
dispatch_async(dispatch_get_main_queue()){
self.collectionView.reloadData()
}
}
} catch let error as NSError {
print(error.description)
}
}
}
task_BTR.resume()
}
Thanks for your help!
I would recommend breaking things apart into multiple methods, with callbacks to sequence the operations, and utilizing Swift's built-in throws error handling mechanism. Here's an example, not perfect, but might help as a starting point:
class TVSeries
{
let title: String
var posterPath: String?
enum Error: ErrorType {
case MalformedJSON
}
init(tvDict: [String: AnyObject]) throws
{
guard let title = tvDict["title"] as? String else {
throw Error.MalformedJSON
}
self.title = title
}
static func loadAllSeries(completionHandler: [TVSeries]? -> Void)
{
NSURLSession.sharedSession().dataTaskWithURL(NSURL(string: BTV_URL_BASE)!) { data, response, error in
guard let data = data else {
print(error)
completionHandler(nil)
return
}
do {
completionHandler(try fromJSONData(data))
}
catch let error {
print(error)
}
}.resume()
}
static func fromJSONData(jsonData: NSData) throws -> [TVSeries]
{
guard let dict = try NSJSONSerialization.JSONObjectWithData(jsonData, options: .AllowFragments) as? [String: AnyObject] else {
throw Error.MalformedJSON
}
guard let results = dict["results"] as? [[String: AnyObject]] else {
throw Error.MalformedJSON
}
return try results.map {
return try TVSeries(tvDict: $0)
}
}
func loadPosterPath(completionHandler: () -> Void)
{
guard let searchPath = title.stringByAddingPercentEncodingWithAllowedCharacters(.URLQueryAllowedCharacterSet()) else {
completionHandler()
return
}
let url = NSURL(string: SEARCH_URL_BASE)!.URLByAppendingPathComponent(searchPath)
NSURLSession.sharedSession().dataTaskWithURL(url) { [weak self] data, response, error in
defer { completionHandler() }
guard let strongSelf = self else { return }
guard let data = data else {
print(error)
return
}
do {
strongSelf.posterPath = try TVSeries.posterPathFromJSONData(data)
}
catch let error {
print(error)
}
}.resume()
}
static func posterPathFromJSONData(jsonData: NSData) throws -> String?
{
guard let dict = try NSJSONSerialization.JSONObjectWithData(jsonData, options: .AllowFragments) as? [String: AnyObject] else {
throw Error.MalformedJSON
}
guard let results = dict["results"] as? [[String: AnyObject]] else {
throw Error.MalformedJSON
}
for result in results {
if let path = result["poster_path"] as? String {
return path
}
}
return nil
}
}
It might also be worth your time to look into something like RxSwift or Alamofire, which help you with these kinds of data-conversion / sequencing operations.