How to write the following snippet in swift 3.0 ? The following syntax is in swift 2
Alamofire.download(.POST, invoice.url,parameters:params, destination: { (url, response) -> NSURL in
let pathComponent = response.suggestedFilename
let fileManager = NSFileManager.defaultManager()
let directoryURL = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
let fileUrl = directoryURL.URLByAppendingPathComponent(pathComponent)
return fileUrl
})
.progress { bytesRead, totalBytesRead, totalBytesExpectedToRead in
print(totalBytesRead)
dispatch_async(dispatch_get_main_queue()) {
let progress = Double(totalBytesRead) / Double(totalBytesExpectedToRead)
completionHandler(progress, nil)
}
}
.responseString { response in
print(response.result.error)
completionHandler(nil, response.result.error)
}
In Swift 3 it is something like this.
let parameters: Parameters = ["foo": "bar"]
let destination: DownloadRequest.DownloadFileDestination = { _, _ in
let pathComponent = "yourfileName"
let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
let fileURL = documentsURL.appendPathComponent(pathComponent)
return (fileURL, [.removePreviousFile, .createIntermediateDirectories])
}
Alamofire.download(urlString, method: .get, parameters: parameters, encoding: JSONEncoding.default, to: destination)
.downloadProgress(queue: DispatchQueue.global(qos: .utility)) { progress in
print("Progress: \(progress.fractionCompleted)")
}
.validate { request, response, temporaryURL, destinationURL in
// Custom evaluation closure now includes file URLs (allows you to parse out error messages if necessary)
return .success
}
.responseJSON { response in
debugPrint(response)
print(response.temporaryURL)
print(response.destinationURL)
}
Check Alamofire Documentation or Alamofire 4.0 Migration Guide for more details.
Use func appendingPathComponent(_ pathComponent: String) -> URL instead of appendPathComponent.
let destination: DownloadRequest.DownloadFileDestination = { _, _ in
let pathComponent = "yourfileName"
let directoryURL: URL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
let folderPath: URL = directoryURL.appendingPathComponent("Downloads", isDirectory: true)
let fileURL: URL = folderPath.appendingPathComponent(pathComponent)
return (fileURL, [.removePreviousFile, .createIntermediateDirectories])
}
and it is also possible to use response.
let destination: DownloadRequest.DownloadFileDestination = { _, response in
let pathComponent = response.suggestedFilename!
let directoryURL: URL = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask)[0]
let folderPath: URL = directoryURL.appendingPathComponent("Downloads", isDirectory: true)
let fileURL: URL = folderPath.appendingPathComponent(pathComponent)
return (fileURL, [.removePreviousFile, .createIntermediateDirectories])
}
Related
New to swiftui and don't understand why the JSONDecoder() line in the first code throws
[SwiftUI] Publishing changes from background threads is not allowed; make sure to publish values from the main thread (via operators like receive(on:)) on model updates.
This to me is not updating ui so why is this showing?
do {
// pass the request type, bearer token, and email / password ( which are sent as POST body params )
let request = L.getRequest(requestType:"POST", token: token, email: self.username, password: self.psw)
L.fetchData(from: request) { result in
switch result {
case .success(let data):
// covert the binary data to a swift dictionary
do {
let response = try JSONDecoder().decode(WpJson.self, from: data)
for (key, title) in response.allowedReadings {
let vimeoId = Int( key )!
let vimeoUri = self.buildVimeoUri(vimeoId: key)
self.addReadingEntity(vimeoUri: vimeoUri, vimeoId: vimeoId, title: title)
}
self.writeToKeychain(jwt:response.jwt, displayName: response.displayName)
readings = self.fetchReadings()
}
catch {
self.error = error.localizedDescription
}
case .failure(let error):
self.error = error.localizedDescription
}
}
}
I tried wrapping a main queue around the do-catch in the L.fetchData(from: request) { result in but this did not help
DispatchQueue.main.async { [weak self] in
Here is the Login protocol, again without any ui work:
import Foundation
import SwiftUI
struct Login: Endpoint {
var url: URL?
init(url: URL?) {
self.url = url
}
}
protocol Endpoint {
var url: URL? { get set }
init(url: URL?)
}
extension Endpoint {
func getRequestUrl() -> URLRequest {
guard let requestUrl = url else { fatalError() }
// Prepare URL Request Object
return URLRequest(url: requestUrl)
}
func getRequest(requestType:String="POST", token:String, email:String="", password:String="") -> URLRequest {
var request = self.getRequestUrl()
request.httpMethod = "POST"
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("Bearer \(token)", forHTTPHeaderField: "Authorization")
if ( "" != email && "" != password && requestType == "POST") {
let parameters:[String:String?] = [
"email": email,
"password": password
]
// Run the request
do {
// pass dictionary to nsdata object and set it as request body
request.httpBody = try JSONSerialization.data(withJSONObject: parameters, options: .prettyPrinted)
} catch let error {
print(error.localizedDescription)
}
}
return request;
}
func fetchData(from request: URLRequest, completion: #escaping (Result<Data, NetworkError>) -> Void) {
URLSession.shared.dataTask(with: request) { data, response, error in
if let data = data {
completion(.success(data))
} else if error != nil {
// any sort of network failure
completion(.failure(.requestFailed))
} else {
// this ought not to be possible, yet here we are
completion(.failure(.unknown))
}
}.resume()
}
}
extension URLSession {
func dataTask(with request: URLRequest, completionHandler: #escaping (Result<(Data, HTTPURLResponse), Error>) -> Void) -> URLSessionDataTask {
return dataTask(with: request, completionHandler: { (data, urlResponse, error) in
if let error = error {
completionHandler(.failure(error))
} else if let data = data, let urlResponse = urlResponse as? HTTPURLResponse {
completionHandler(.success((data, urlResponse)))
}
})
}
}
Do you have any idea on how to fix this?
Wrap it right in place of assignment
catch {
DispatchQueue.main.async {
self.error = error.localizedDescription
}
}
case .failure(let error):
DispatchQueue.main.async {
self.error = error.localizedDescription
}
}
I'm trying to get data from JSON with Alamofire but the data come with ["Chris Martin"] and not Chris Martin. Check this image
Here is my code
#IBAction func botaoSalvar(_ sender: Any) {
let nomeUsuario = self.campoUsuario.text;
let cpf = self.campoCPF.text;
let senha = self.campoSenha.text;
let param = ["nome": nomeUsuario, "cpf": cpf, "senha": senha, "method": "app-set-usuario"]
var _: HTTPHeaders = ["Content-Type": "application/json"]
let url = "http://easypasse.com.br/gestao/wsCadastrar.php"
Alamofire.request(url, method:.post, parameters:param,encoding: JSONEncoding.default).responseJSON { response in
switch response.result {
case .success:
//print(response)
let json = JSON(response.result.value as Any)
let idusuario = json["usuario"].arrayValue.map({$0["idUsuario"].stringValue})
let nome = json["usuario"].arrayValue.map({$0["nome"].stringValue})
let cpf = json["usuario"].arrayValue.map({$0["cpf"].stringValue})
print(idusuario)
print(nome)
print(cpf)
case .failure(let error):
print(0,"Error")
}
}
How should i fix it?
Thank you.
Im not able to find where i have gone wrong.I tried all possible solutions but nothing seems to work.
Can anyone suggest where I have gone wrong?
My code is as below:
var diaryEntryUrl = "http://myUrl?uid=10001&diary_text=\(textPrint)&location=\(loactionAddrEnc)"
// var diaryEntryUrl = diaryEntryUrlEncode.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed) --- tried encoding, but didn't work
let postParameters:[String: Any] = [ "imagesName": self.awsImageArray2, "tagsList": self.tagArray]
Alamofire.request(diaryEntryUrl, method: .post, parameters: postParameters, encoding: JSONEncoding.default, headers: [:]).responseJSON {
response in
if response.result.isSuccess{
print("SuccessFully Added")
}else{
print("Error \(String(describing: response.result.error))")
}
}
I tried encoding the texts also but still error is there.I did it as below:
loactionAddrEnc = loactionAddr.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)
var textPrint = diaryEntryText.text.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)
I am getting the follwing error:
As you can see in the log Optional for location and diary text. So it means you need to unwrap it first.
if let textPrint = textPrint, let loactionAddrEnc = loactionAddrEnc {
var diaryEntryUrl = "http://myUrl?uid=10001&diary_text=\(textPrint)&location=\(loactionAddrEnc)"
// rest of your code
}
This should solve your problem. But there is another way.
You can pass all your query params in postParameters.
var diaryEntryUrl = "http://myUrl"
var postParameters:[String: Any] = [ "imagesName": self.awsImageArray2, "tagsList": self.tagArray]
postParameters["uid"] = "10001"
if let textPrint = textPrint {
postParameters["diary_text"] = textPrint
}
if let loactionAddrEnc = loactionAddrEnc {
postParameters["location"] = loactionAddrEnc
}
Alamofire.request(diaryEntryUrl, method: .post, parameters: postParameters, encoding: JSONEncoding.default, headers: [:]).responseJSON {
response in
if response.result.isSuccess {
print("SuccessFully Added")
}else{
print("Error \(String(describing: response.result.error))")
}
This is my code for Jason parsing in Swift:
static func POST(url: String, parameters: NSDictionary, completionBlock: #escaping CompletionBlock){
let todoEndpoint: String = Webservices.Base_Url.appending(url)
guard let url = NSURL(string: todoEndpoint) else {
print("Error: cannot create URL")
return
}
var request = URLRequest(url: url as URL)
//var request = URLRequest(url: NSURL(string: todosEndpoint)! as URL)
let session = URLSession.shared
request.httpMethod = "POST"
var err: NSError?
let jsonData = try? JSONSerialization.data(withJSONObject: parameters)
request.httpBody = jsonData
request.addValue("application/x-www-form-urlencoded;charset=UTF-8 ", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
let task = session.dataTask(with: request, completionHandler: {data, response, error -> Void in
guard error == nil else {
print("error calling POST on /todos/1")
print(error)
return
}
// make sure we got data
guard let dataTemp = data else {
print("Error: did not receive data")
return
}
// parse the result as JSON, since that's what the API provides
do {
guard let todo = try JSONSerialization.jsonObject(with: dataTemp, options: []) as? [String: AnyObject] else {
print("error trying to convert data to JSON")
return
}
// now we have the todo, let's just print it to prove we can access it
print("The todo is: " , todo)
// the todo object is a dictionary
// so we just access the title using the "title" key
// so check for a title and print it if we have one
} catch {
print("error trying to convert data to JSON")
return
}
})
task.resume()
}
I got while jason parsing:
error expression produced error: error: Execution was interrupted,
reason: EXC_BAD_ACCESS (code=1, address=0x0). The process has been
returned to the state before expression evaluation.
What's wrong?
I have a FileHelper class where I've implemented 3 methods whose job is to write a Dictionary contents to a file. Those methods are:
func storeDictionary(_ dictionary: Dictionary<String, String>, inFile fileName: String, atDirectory directory: String) -> Bool {
let ext = "txt"
let filePath = createFile(fileName, withExtension: ext, atDirectory: directory)
/**** //If I use this method, file is created and dictionary is saved
guard (dictionary as NSDictionary).write(to: filePath!, atomically: true) else {
return false
}
*/
guard NSKeyedArchiver.archiveRootObject(dictionary, toFile: (filePath?.absoluteString)!) else {
return false
}
return true
}
func createFile(_ file: String, withExtension ext: String, atDirectory directory: String) -> URL? {
let directoryPath = createDirectory(directory)
let filePath = directoryPath?.appendingPathComponent(file).appendingPathExtension(ext)
if !FileManager.default.fileExists(atPath: (filePath?.absoluteString)!) {
let success = FileManager.default.createFile(atPath: (filePath?.absoluteString)!, contents: nil, attributes: nil)
print("\(success)") //** here is the issue I investigated. Always prints false.
}
return filePath
}
func createDirectory(_ directory: String) -> URL? {
let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
let directoryPath = documentsDirectory.appendingPathComponent(directory)
do {
try FileManager.default.createDirectory(at: directoryPath, withIntermediateDirectories: true, attributes: nil)
} catch let error as NSError {
fatalError("Error creating directory: \(error.localizedDescription)")
}
return directoryPath
}
When I call FileHelper().storeDictionary(aValidDictionary, inFile: "abc", atDirectory: "XYZ") to write the dictionary, it fails with this procedure. But if I use
guard (dictionary as NSDictionary).write(to: filePath!, atomically: true) else {
return false
}
it works.
What's wrong with NSKeyedArchiver.archiveRootObject(_:toFile:) method??
And why FileManager.default.createFile(atPath: (filePath?.absoluteString)!, contents: nil, attributes: nil) always returns false?
First of all filePath?.absoluteString returns the entire – even percent escaped – string including the file:// scheme and the method expects a path without the scheme (filePath?.path - the naming is a bit confusing ;-) ).
I recommend to save a [String:String] dictionary as property list file. It's not necessary to create the file explicitly.
I changed the signatures of the methods slightly in the Swift-3-way. Further there is no need to use any optional type.
func store(dictionary: Dictionary<String, String>, in fileName: String, at directory: String) -> Bool {
let fileExtension = "plist"
let directoryURL = create(directory:directory)
do {
let data = try PropertyListSerialization.data(fromPropertyList: dictionary, format: .xml, options: 0)
try data.write(to: directoryURL.appendingPathComponent(fileName).appendingPathExtension(fileExtension))
return true
} catch {
print(error)
return false
}
}
func create(directory: String) -> URL {
let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
let directoryURL = documentsDirectory.appendingPathComponent(directory)
do {
try FileManager.default.createDirectory(at: directoryURL, withIntermediateDirectories: true, attributes: nil)
} catch let error as NSError {
fatalError("Error creating directory: \(error.localizedDescription)")
}
return directoryURL
}
PS: Instead of returning a Bool you could make the store method can throw and handle the error in the calling method:
func store(dictionary: Dictionary<String, String>, in fileName: String, at directory: String) throws {
let fileExtension = "plist"
let directoryURL = create(directory:directory)
let data = try PropertyListSerialization.data(fromPropertyList: dictionary, format: .xml, options: 0)
try data.write(to: directoryURL.appendingPathComponent(fileName).appendingPathExtension(fileExtension))
}
Here's a swift 5 extension that should save any Dictionary where the Key and Value are Codable
extension Dictionary where Key: Codable, Value: Codable {
static func load(fromFileName fileName: String, using fileManager: FileManager = .default) -> [Key: Value]? {
let fileURL = Self.getDocumentsURL(on: .cachesDirectory, withName: fileName, using: fileManager)
guard let data = fileManager.contents(atPath: fileURL.path) else { return nil }
do {
return try JSONDecoder().decode([Key: Value].self, from: data)
} catch(let error) {
print(error)
return nil
}
}
func saveToDisk(on directory: FileManager.SearchPathDirectory,
withName name: String,
using fileManager: FileManager = .default) throws {
let fileURL = Self.getDocumentsURL(on: .cachesDirectory, withName: name, using: fileManager)
let data = try JSONEncoder().encode(self)
try data.write(to: fileURL)
}
private static func getDocumentsURL(on directory: FileManager.SearchPathDirectory,
withName name: String,
using fileManager: FileManager) -> URL {
let folderURLs = fileManager.urls(for: .cachesDirectory, in: .userDomainMask)
let fileURL = folderURLs[0].appendingPathComponent(name)
return fileURL
}
}
Usage:
let myDict = [MyKey: MyValue].load(from: diskDirectory, andFileName: diskFileName) // load
try myDict.saveToDisk(on: diskDirectory, withName: diskFileName) // save