I have this code snippet here:
let endpointURL = URL(string: "http://foobar.com")
let downloadTask = URLSession.shared.downloadTask(with: endpointURL!, completionHandler: { url, response, error in
if (error == nil) {
let dataObject = NSData(contentsOfURL: endpointURL!)
let jsonArray: Array = JSONSerialization.JSONObjectWithData(dataObject!, options: nil, error: nil) as Array
}
})
downloadTask.resume()
And I'm having this issue:
Ambiguous use of 'init(contentsOfURL:)' for NSData part
How can I make it unambiguous?
I recommend to use something like this in Swift 3, to load JSON data dataTask is more appropriate than downloadTask.
let endpointURL = URL(string: "http://foobar.com")
let dataTask = URLSession.shared.dataTask(with: endpointURL!) { data, response, error in
guard error == nil else {
print(error!)
return
}
do {
// the assumed result type is `[[String:Any]]` cast it to the expected type
if let jsonArray = try JSONSerialization.jsonObject(with: data!) as? [[String:Any]] {
print(jsonArray)
}
} catch {
print(error)
}
}
dataTask.resume()
Related
I have the following code to get the path between two points in Google maps iOS SDK. However, I am not receiving any data back or any errors even.
let url = URL(string: "http://maps.googleapis.com/maps/api/directions/json?origin=\(latitude),\(longitude)&destination=\(finallat),\(finallong)&key=**************")
URLSession.shared.dataTask(with: url!) { (data:Data?, response:URLResponse?, error:Error?) in
if let data = data {
do {
// Convert the data to JSON
let jsonSerialized = try JSONSerialization.jsonObject(with: data, options: []) as? [String : Any]
if let json = jsonSerialized, let url = json["url"], let explanation = json["explanation"] {
print(url)
print(explanation)
}
} catch let error as NSError {
print(error.localizedDescription)
}
} else if let error = error {
print(error.localizedDescription)
}
}
You don't do anything with the dataTask so it isn't actually being called. You need to call resume().
let url = URL(string: "http://maps.googleapis.com/maps/api/directions/json?origin=\(latitude),\(longitude)&destination=\(finallat),\(finallong)&key=**************")
let task = URLSession.shared.dataTask(with: url!) { (data:Data?, response:URLResponse?, error:Error?) in
if let data = data {
do {
// Convert the data to JSON
let jsonSerialized = try JSONSerialization.jsonObject(with: data, options: []) as? [String : Any]
if let json = jsonSerialized, let url = json["url"], let explanation = json["explanation"] {
print(url)
print(explanation)
}
} catch let error as NSError {
print(error.localizedDescription)
}
} else if let error = error {
print(error.localizedDescription)
}
}
task.resume()
I have a json file that looks something like this:
{
"adTitle": "My Title",
"adURL": "https://mylink.com/",
"adImageURL": "http://mywebsite/bannerx#3x.png"
}
I get the JSON value from website: http://mywebsite.com/file.json
The problem is that the ad somehow doesn't load the adImageURL, so when I press the UIImageView, but when I press the area that then UIImageView should be, it open my adURL. This is the code I use for JSON:
var imageURL:String = "http://mywebsite/bannerx#3x.png"
var adURL:String = "https://mylink.com/"
func loadAdvertisement() {
// Set up the URL request
let todoEndpoint: String = "http://mywebsite.com/file.json"
guard let url = URL(string: todoEndpoint) else {
print("Error: cannot create URL")
return
}
let urlRequest = URLRequest(url: url)
// set up the session
let config = URLSessionConfiguration.default
let session = URLSession(configuration: config)
// make the request
let task = session.dataTask(with: urlRequest) {
(data, response, error) in
// check for any errors
guard error == nil else {
// print("error calling GET on /todos/1")
// print(error!)
return
}
// make sure we got data
guard let responseData = data else {
print("Error: did not receive data")
return
}
// parse the result as JSON, since that's what the API provides
do {
guard (try JSONSerialization.jsonObject(with: responseData, options: []) as? [String: AnyObject]) != nil else {
print("error trying to convert data to JSON")
return
}
let json = try JSONSerialization.jsonObject(with: responseData, options:.allowFragments) as! [String:AnyObject]
if (json != nil) {
self.imageURL = (json["adImageURL"] as? String)!
self.adURL = (json["adURL"] as? String)!
print(self.imageURL)
print(self.adURL)
DispatchQueue.main.async { () -> Void in
self.loadAdImage(self.imageURL)
}
}
} catch {
print("error trying to convert data to JSON")
return
}
}
task.resume()
// let jsonURL = URL(string: "http://mywebsite.com/file.json")
// self.getDataFromUrl(jsonURL!, completion: (data:Data?, response:URLResponse?, error:Error?)) -> Void
}
func loadAdImage(_ url:String) {
getDataFromUrl(URL(string: url)!) { (data, response, error) in
DispatchQueue.main.async { () -> Void in
guard let data = data, error == nil else { return }
print(response?.suggestedFilename ?? "")
print("Download Finished")
self.advertImageView.image = UIImage(data: data)
}
}
}
func getDataFromUrl(_ url:URL, completion: #escaping ((_ data: Data?, _ response: URLResponse?, _ error: NSError? ) -> Void)) {
URLSession.shared.dataTask(with: url) { (data:Data?, response:URLResponse?, error:Error?) in
completion(data, response, error as NSError?)
}.resume()
}
In the event LOG, is prints out both of the print("error trying to convert data to JSON") commands. I have used this code before in my project, and it worked just fine, but I have no idea why it wont work anymore.
Add the message to catch and check what actually error you are getting like this way:
do {
let json = try JSONSerialization.jsonObject(with: responseData, options:.allowFragments) as! [String:AnyObject]
} catch let message {
print("error trying to convert data to JSON" + "\(message)")
return
}
Iam getting an error while i try to send the POST request in swift 3. Any one please suggest me the correct syntax for URLSession.shared method in swift 3. this is what i tried. iam new here.
let task = URLSession.shared.dataTask(with: request, completionHandler: {
(data, response, error) in
if error != nil{
print("error");
return
}
do{
let myjson = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary
if let parsejson = myjson{
var msg: String!
msg = parsejson["message"] as! String?
print(msg)
}catch error {
print ("")
}
}
})
task.resume().
Here's working URLSession.shared code. I don't have your URL so I used one that is online, free, and produces JSON:
let someURL = URL(string:"https://jsonplaceholder.typicode.com/posts/2")!
let request = URLRequest(url: someURL)
let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
if error != nil {
print("error")
return
}
guard let data = data else {
print("No data")
return
}
do {
if let myjson = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? Dictionary<String,Any> {
if let title = myjson["title"] {
print("Title was \"\(title)\"")
}
}
} catch {
print("Error parsing JSON: \(error)")
}
}
task.resume()
This outputs Title was "qui est esse" for me.
let defaultConfiguration = URLSessionConfiguration.default
let operationQueue = OperationQueue.main
let defaultSession = URLSession(configuration: defaultConfiguration, delegate: self, delegateQueue: operationQueue)
if let url = URL(string: "https://newsapi.org/v1/articles?source=abc-news-au&sortBy=top&apiKey=47d2ce48babd47b1bc391b426b89ca23")
{
(defaultSession.dataTask(with: url) { (data, response, error) in
if error != nil{
return
}
do {
let resultJson = try JSONSerialization.jsonObject(with: data!, options: []) as? [String:AnyObject]
if var dataDictionary = resultJson {
// dataDictionary["access_token"] as AnyObject
self.dataArray = dataDictionary["articles"] as! [Any]
var dataDictionary22 = self.dataArray[0] as! [String: Any] as [String : AnyObject]
let url = URL(string:
"\(String(describing: dataDictionary22["urlToImage"]!))")
print("url -> \(String(describing: url!))")
let task = URLSession.shared.dataTask(with: url!) { data, response, error in
guard let data = data, error == nil else {
return
}
self.imageView.image = UIImage(data: data)
}
task.resume()
}
} catch {
print("Error -> \(error)")
}
}).resume()
}
i am trying to get news updates from open api through nsurlsession and it has dictionary->array->dictionary->at key "urlToImage"
but iam getting url like http://www.abc.net.au/news/image/8968140-1x1-700x700.jpg but not getting image file in data it was empty can any one minimige the code lenth and solve my problem
Using this piece of code, you can parse that specific URL response successfully, I have tested it in a Playground.
This: "\(String(describing: dataDictionary22["urlToImage"]!))" is not the way get a String from an AnyObject, you should use conditional casting.
if let url = URL(string: "https://newsapi.org/v1/articles?source=abc-news-au&sortBy=top&apiKey=47d2ce48babd47b1bc391b426b89ca23"){
URLSession.shared.dataTask(with: url, completionHandler: { data, response, error in
guard error == nil, let data = data else {
print(error!);return
}
guard let resultJson = (try? JSONSerialization.jsonObject(with: data)) as? [String:Any] else {
return
}
print(resultJson)
guard let articles = resultJson["articles"] as? [[String:Any]], let firstArticle = articles.first else { return }
guard let imageUrlString = firstArticle["urlToImage"] as? String, let imageUrl = URL(string: imageUrlString) else { return }
URLSession.shared.dataTask(with: imageUrl, completionHandler: { data, response, error in
guard error == nil, let data = data else {
print(error!);return
}
let image = UIImage(data: data)
DispatchQueue.main.async {
self.imageView.image = image
}
}).resume()
}).resume()
}
If you want to get all article pictures (in your question you were only parsing the first one), just change guard let articles = resultJson["articles"] as? [[String:Any]], let firstArticle = articles.first else { return } to the following:
for article in articles {
guard let imageUrlString = article["urlToImage"] as? String, let imageUrl = URL(string: imageUrlString) else { return }
URLSession.shared.dataTask(with: imageUrl, completionHandler: { data, response, error in
guard error == nil, let data = data else {
print(error!);return
}
let image = UIImage(data: data)
//use the image
}).resume()
}
let url1 = "https://jsonplaceholder.typicode.com/posts"
var request = URLRequest(url: URL(string: url1)!)
request.httpMethod = "GET"
let urlSession = URLSession.shared
let task = urlSession.dataTask(with: request, completionHandler: {(data,response,error) -> Void in
if let error = error {
print(error)
return
}
if let data = data {
OperationQueue.main.addOperation({ () -> Void in
self.tableView.reloadData()
})
}
})
task.resume()
With or without http method, response data is empty. What am I doing wrong? WiFi works fine. Maybe problem on my simulator settings?
let url = URL(string: "https://jsonplaceholder.typicode.com/posts")
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)
let posts = json as? [[String: Any]] ?? []
print(posts)
for post in posts{
let product = Product()
product.userId = post["userId"] as! Int
product.id = post["id"] as! Int
product.title = post["title"] as! String
product.body = post["body"] as! String
self.products.append(product)
}
} catch let error as NSError {
print(error)
}
}).resume()
Yeah thanks, but your code is not works too, i mean say data is empty, nothing to be parsed. WiFi on my emulator works fine maybe problem on my xcode8?
Made some changes in your code.
let url = NSURL(string: "https://jsonplaceholder.typicode.com/posts")
NSURLSession.sharedSession().dataTaskWithRequest(NSURLRequest.init(URL: url!), completionHandler: {(data, response, error) in
guard let data = data where error == nil else { return }
do {
let posts = try NSJSONSerialization.JSONObjectWithData(data, options: .AllowFragments)
print(posts)
} catch let error as NSError {
print(error)
}
}).resume()
Output :
Here your all 100 post display