I tried to use "Yoda Speak" API by Mashape in Swift.
I will print the data from the API.
I succeeded calling "response" method after "getData" method but my simulator is out in the "response" method.
I know there're some similar questions, but I couldn't.
Please give me some advices.
func response(res: NSURLResponse!, data: NSData!, error: NSError!) {
println("response")
if error != nil {
// If there is an error in the web request, print it to the console
println(error.localizedDescription)
} else {
println("succeeded")
}
// simulator is out here.
var json: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
for value in json {
dispatch_async(dispatch_get_main_queue(), { () -> Void in
println(value)
})
}
}
func getData() {
println("getData")
// URL.
let url = NSURL(string: "https://yoda.p.mashape.com/yoda?sentence=You+will+learn+how+to+speak+like+me+someday.++Oh+wait.")!
// URLRequest.
var req = NSMutableURLRequest(URL: url)
// header.
req.setValue("jY0bEhHCBpmsh8j1mpA5p11tCJGyp1tok3Zjsn4ubbvNNp5Jt3", forHTTPHeaderField: "X-Mashape-Key")
let connection: NSURLConnection = NSURLConnection(request: req, delegate: self, startImmediately: false)!
// Connection to the server.
NSURLConnection.sendAsynchronousRequest(req, queue: NSOperationQueue.mainQueue(), completionHandler: self.response)
println("complete")
}
I would give Alamofire a try. I know this also works well with SwiftyJSON. There is a great example on the GitHub page on how to request/receive a response with Alamofire.
Related
i did read a lot about functions with completion-handler, but now i have a problem how to call this function (downloadJSON) in the correct way. Which parameters do i have to give in the function and handle the result-data (json) in my own class, where the function was called.
This is the code from David Tran. Hi makes wonderful tutorials, but in the code there is no call of this function.
let request: URLRequest
lazy var configuration: URLSessionConfiguration = URLSessionConfiguration.default
lazy var session: URLSession = URLSession(configuration: self.configuration)
typealias JSONHandler = (JSON?, HTTPURLResponse?, Error?) -> Void
func downloadJSON(completion: #escaping JSONHandler)
{
let dataTask = session.dataTask(with: self.request) { (data, response, error) in
// OFF THE MAIN THREAD
// Error: missing http response
guard let httpResponse = response as? HTTPURLResponse else {
let userInfo = [NSLocalizedDescriptionKey : NSLocalizedString("Missing HTTP Response", comment: "")]
let error = NSError(domain: DANetworkingErrorDomain, code: MissingHTTPResponseError, userInfo: userInfo)
completion(nil, nil, error as Error)
return
}
if data == nil {
if let error = error {
completion(nil, httpResponse, error)
}
} else {
switch httpResponse.statusCode {
case 200:
// OK parse JSON into Foundation objects (array, dictionary..)
do {
let json = try JSONSerialization.jsonObject(with: data!, options: []) as? [String : Any]
completion(json, httpResponse, nil)
} catch let error as NSError {
completion(nil, httpResponse, error)
}
default:
print("Received HTTP response code: \(httpResponse.statusCode) - was not handled in NetworkProcessing.swift")
}
}
}
dataTask.resume()
}
Let Xcode help you. Type downlo and press return. Xcode completes the function
Press return again and you get the parameters
You have to replace the placeholders with parameter names for example
downloadJSON { (json, response, error) in
if let error = error {
print(error)
} else if let json = json {
print(json)
}
}
Note:
There is a fatal type mismatch error in your code: The result of the JSONSerialization line is [String:Any] but the first parameter of the completion handler is JSON
I'm making an http post request within the XCTest framework in Xcode for a simple UI test for my app. Within the request, the response is returned. I can't access that response outside of the URLSession task, and I need to because it contains a JWT that must be decoded and used for another http post request.
I've tried researching how to do this, but it is hard to know the right path as I am a beginner in Swift. I've tried creating a new json object and assigning that response to it outside of the URLSession, but it just says that it can't find that response, it is outside of scope.
// make HTTP request
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else {
print(error?.localizedDescription ?? "No data")
return
}
let responseJSON = try? JSONSerialization.jsonObject(with: data, options: [])
if let responseJSON = responseJSON as? [String: Any] {
print(responseJSON)
}
}
task.resume()
let response = responseJSON as! [String:Any]
The expected results are that I now have my response object outside of the http request and I can then decode it. The actual results is the error:
Use of unresolved identifier 'responseJSON'
The request your making is asynchronous. So when you run the line...
let response = responseJSON as! [String:Any]
the network request hasn't finished yet. So you would normally use a completion handler that will be called when the network returns
Here is an example playground:
//: Playground - noun: a place where people can play
import PlaygroundSupport
import UIKit
PlaygroundPage.current.needsIndefiniteExecution = true
func postSomeData(completion: #escaping ([String: Any]?, Error?) -> Void) {
// setup request
let url = URL(string: "https://jsonplaceholder.typicode.com/todos/1")
let request = URLRequest(url: url!)
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else {
print(error?.localizedDescription ?? "No data")
completion(nil, error)
}
let responseJSON = try? JSONSerialization.jsonObject(with: data, options: [])
if let responseJSON = responseJSON as? [String: Any] {
completion(responseJSON, nil)
}
}
task.resume()
}
postSomeData() { response, error in
print(response, error)
PlaygroundPage.current.finishExecution()
}
Output:
Optional(["id": 1, "title": delectus aut autem, "completed": 0, "userId": 1]) nil
I would also suggest that you use Codable for parsing and mapping the JSON response. Here is an intro to using Codable but there are lots of resources available online on the subject.
I have registered for an accuweather developer account and have an apikey.
How do I make a call to the accuweather api in swift and how do I interpret the result, that I got back?
let citySearchURL = "https://dataservice.accuweather.com/locations/v1/cities/search?apikey=my_api_key&q=my_location_query"
let url : URL = URL(string: citySearchURL)!
var request = URLRequest(url: url)
let task = URLSession.shared.dataTask(with: request) { (data : Data?, response : URLResponse?, error: Error?) in
if let data = data {
do {
if let json = try JSONSerialization.jsonObject(with: data, options: []) as? [String:Any] {
print(json)
}
} catch {
print(error.localizedDescription)
}
}
}
task.resume()
This is my current piece of code. It gives me no output to the console, which means that the JSON Serialization didn't work properly. What did I do wrong?
Below is the content of data, response and error:
data:936 bytes
response:<NSHTTPURLResponse: 0x600000036520> Here follows some more json, but stackoverflow doesn't recognize it as code/quotes...
Link to the api reference: Accuweather API
data:936 bytes mean that you received API response of 936 bytes, so there no issue.
The issue is you can not parse that data to object, in your JSONSerialization statement you added [String:Any] as optional type but response is not of this type, thats way the print statement not getting execute.
let citySearchURL = "https://dataservice.accuweather.com/locations/v1/cities/search?apikey=my_api_key&q=my_location_query"
let url : URL = URL(string: citySearchURL)!
let request = URLRequest(url: url)
let task = URLSession.shared.dataTask(with: request) { (data : Data?, response : URLResponse?, error: Error?) in
if let data = data {
do {
if let json = try JSONSerialization.jsonObject(with: data, options: []) as? [Any]{
print(json)
}
} catch {
print(error.localizedDescription)
}
}
}
task.resume()
i created a watchOS app that request a value from an API and show it on a label.
It is working perfectly in the simulator but when I execute it on my Apple Watch it crashes with the following error:
[ERROR] There is an unspecified error with the connection
fatal error: unexpectedly found nil while unwrapping an Optional value
The first error is generated by my code.
The code I wrote is:
func price_request() -> NSData? {
guard let url = NSURL(string: "https://api.xxxxx.com/xxx.php") else {
return nil
}
guard let data = NSData(contentsOfURL: url) else {
print("[ERROR] There is an unspecified error with the connection")
return nil
}
print("[CONNECTION] OK, data correctly downloaded")
return data
}
func json_parseData(data: NSData) -> NSDictionary? {
do {
let json: AnyObject = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers) as! Dictionary<String, AnyObject>
print("[JSON] OK!")
return (json as? NSDictionary)
} catch _ {
print("[ERROR] An error has happened with parsing of json data")
return nil
}
}
I tried also to add the App Transport Security bypass also if it is not needed because of a request to an HTTPS URL but it does not works.
Can you please help me?
Thank you
Try using NSURLSession to get data...
//declare data task
var task: URLSessionDataTask?
//setup the session
let url = URL(string:"https://url.here")!
let session = URLSession(configuration: URLSessionConfiguration.default)
task = session.dataTask(with: url){ (data, res, error) -> Void in
if let e = error {
print("dataTaskWithURL fail: \(e.localizedDescription)")
return
}
if let d = data {
//do something
}
}
task!.resume()
I am trying to follow a tutorial - which failed and having found some code on stack over flow Make REST API call in Swift decided to try this approach instead. The following code is a copy and paste (I know!) with a change of URL yet I seem to be getting an error printed to the console rather than the JSON - the error being largely unhelpful - 0x0000000000000000
The JSON appears to print to the browser window so I am not fully sure what might be wrong with this approach? Please could someone provide some help as to why this might not be working?
Thanks
var url : String = "http://www.flickr.com/services/rest/?method=flickr.test.echo&format=json&api_key=d6e995dee02d313a28ed4b799a09b869"
var request : NSMutableURLRequest = NSMutableURLRequest()
request.URL = NSURL(string: url)
request.HTTPMethod = "GET"
NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue(), completionHandler:{ (response:NSURLResponse!, data: NSData!, error: NSError!) -> Void in
var error: AutoreleasingUnsafeMutablePointer<NSError?> = nil
let jsonResult: NSDictionary! = NSJSONSerialization.JSONObjectWithData(data, options:NSJSONReadingOptions.MutableContainers, error: error) as? NSDictionary
if (jsonResult != nil) {
println(jsonResult);
} else {
// couldn't load JSON, look at error
println(error);
}
})
The problem is that the call returns data in JSONP not JSON
Your code would work ok if tested with a correct JSON like http://ip.jsontest.com
To make it work with Flickr you have to modify it as follows:
var json_str:NSString = NSString(data: data, encoding: NSUTF8StringEncoding)
json_str = json_str.substringFromIndex(14)
json_str = json_str.substringToIndex(json_str.length-1)
let new_data:NSData = json_str.dataUsingEncoding(NSUTF8StringEncoding)!
var error: AutoreleasingUnsafeMutablePointer<NSError?> = nil
let jsonResult: NSDictionary! = NSJSONSerialization.JSONObjectWithData(new_data, options:NSJSONReadingOptions.MutableContainers, error: error) as? NSDictionary
if (jsonResult != nil) {
println(jsonResult);
} else {
// couldn't load JSON, look at error
println(error);
}