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I need to parse JSON from 2 different URL's
let jsonUrlStr1 = "https://123"
let jsonUrlStr2 = "https://325"
guard let url1 = URL(string: jsonUrlStr1) else { return }
guard let url2 = URL(string: jsonUrlStr2) else { return }
Here I'm running session for 1st url:
URLSession.shared.dataTask(with: url1) { (data, response, err) in
if err != nil {
print("Error:\(String(describing: err))")
}
guard let data = data else { return }
do {
let myData1 = try JSONDecoder().decode(SomeJsonModel1.self, from: data)
//Some code
} catch let jsonErr {
print("Error:\(jsonErr)")
}
}.resume()//URLSession
And then again, I'm running another session for 2nd url, using the same way:
URLSession.shared.dataTask(with: url2) { (data, response, err) in
if err != nil {
print("Error:\(String(describing: err))")
}
guard let data = data else { return }
do {
let myData2 = try JSONDecoder().decode(SomeJsonModel2.self, from: data)
//Some code
} catch let jsonErr {
print("Error:\(jsonErr)")
}
}.resume()//URLSession
This code works and I get the result.
But I think there should be a more correct way to parse 2 URLs.
Please advise how to do it correctly. Thanks.
You can try using completion block like this :
func getDataFromJson(url: String, completion: #escaping (_ success: [String : Any]) -> Void) {
let request = URLRequest(url: URL(string: url)!)
let task = URLSession.shared.dataTask(with: request) { Data, response, error in
guard let data = Data, error == nil else { // check for fundamental networking error
print("error=\(String(describing: error))")
return
}
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 { // check for http errors
print("statusCode should be 200, but is \(httpStatus.statusCode)")
print(response!)
return
}
let responseJSON = try! JSONSerialization.jsonObject(with: data, options: .allowFragments) as! [String : Any]
completion(responseJSON)
}
task.resume()
}
and call method like this :
let jsonUrlStr1 = "https://123"
let jsonUrlStr2 = "https://325"
getDataFromJson(url: jsonUrlStr1, completion: { response in
print("JSON response for url1 :: ",response) // once jsonUrlStr1 get it's response call next API
getDataFromJson(url: jsonUrlStr2, completion: { response in
print("JSON response for url2 :: ",response)
})
})
I'm using this function to send post values to server:
func getFirstPageApplication(EMPTY:String,completionHandler: #escaping (_ response: String) -> ())
{
var strResponse = "null"
var request = URLRequest(url: URL(string: self.baseURL+"getFirstPageApplication")!)
request.httpMethod = "POST"
let postString = "EMAIL=\(EMPTY)"
request.httpBody = postString.data(using: .utf8)
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else { // check for fundamental networking error
print("error=\(error)")
return
}
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 { // check for http errors
print("statusCode should be 200, but is \(httpStatus.statusCode)")
print("response = \(response)")
}
let responseString = String(data: data, encoding: .utf8)
strResponse = responseString!
completionHandler(strResponse)
}
task.resume()
}
in my other controller I use this function to use above method:
func initialFirstView()
{
RestApiManager.sharedInstance.getFirstPageApplication(EMPTY:"-"){
response in
let json = JSON(response)
print("res: \(json["sliders"])")
}
}
I got response value but json["sliders"] returns null, I don't know!
my response value:
{"sliders":[{"id":4,"title":"\u0647\u0645\u06cc\u0634\u0647 \u0628\u0647 \u0622\u0648\u0627\u0632 \u0628\u0627 \u0627\u0633\u062a\u0627\u062f\u06a9\u062a","image":"1500801181_ostadcat_slider_1.jpg","status":1,"created_at":"2017-07-23 04:43:01","updated_at":"2017-07-23 04:43:01"},{"id":6,"title":"\u06cc\u06a9\u06cc \u0628\u0631\u0627\u06cc \u0647\u0645\u0647, \u0647\u0645\u0647 \u0628\u0631\u0627\u06cc \u06cc\u06a9\u06cc","image":"1500801699_ostadcat_slider_3.jpg","status":1,"created_at":"2017-07-23 04:51:39","updated_at":"2017-07-23 04:51:39"},{"id":7,"title":"\u062d\u0631\u0641\u0647 \u0627\u06cc \u062a\u0631\u06cc\u0646 \u0627\u067e\u0644\u06cc\u06a9\u06cc\u0634\u0646 \u0645\u0648\u0633\u06cc\u0642\u06cc","image":"1500801728_ostadcat_slider_4.jpg","status":1,"created_at":"2017-07-23 04:52:08","updated_at":"2017-07-23 04:52:08"},{"id":8,"title":"\u062a\u0648 \u0647\u0645 \u0645\u06cc \u062a\u0648\u0646\u06cc \u0645\u062b\u0644 \u0645\u0646 \u0628\u0627\u0634\u06cc!!!","image":"1500801751_ostadcat_slider_2.jpg","status":1,"created_at":"2017-07-23 04:52:31","updated_at":"2017-07-23 04:52:31"}],"tutorials":[{"id":1,"home_image":"1500806287_img_home_test_6.png","tutorial_image":"1500809220_Hot-Romanian-Inna-in-black-goggles-wallpapers.jpg","tutorial_title":"\u062e\u0648\u0627\u0646\u0646\u062f\u06af\u06cc","tutorial_description":"\u0622\u0645\u0648\u0632\u0634 \u062c\u0627\u0645\u0639 \u062e\u0648\u0627\u0646\u0646\u062f\u06af\u06cc","video":"1500810916_innaHot2.mp4","video_title":"\u062e\u0648\u0627\u0646\u0646\u062f\u06af\u06cc \u0631\u0627 \u062d\u0631\u0641\u0647 \u0627\u06cc \u06cc\u0627\u062f \u0628\u06af\u06cc\u0631\u06cc\u062f","teacher_image":"1500808975_inna-dark-hair-white-dresses-digital-art.jpg","teacher_name":"\u0627\u06cc\u0646\u0627","teacher_bio":"\u0628\u0647\u062a\u0631\u06cc\u0646 \u0627\u0632 \u0633\u0627\u0644 2009 \u062a\u0627 \u0628\u0647 \u0627\u0644\u0627\u0646","status":1,"created_at":"2017-06-29 17:31:20","updated_at":"2017-07-23 11:55:16"},{"id":2,"home_image":"1500802877_img_home_test_1.jpg","tutorial_image":"1500802877_Image.png","tutorial_title":"\u0622\u0645\u0648\u0632\u0634 \u06af\u06cc\u062a\u0627\u0631 \u0627\u0633\u0644\u0634","tutorial_description":"\u06af\u06cc\u062a\u0627\u0631 \u0627\u0633\u0644\u0634 \u0631\u0627 \u06cc\u0627\u062f \u0628\u06af\u06cc\u0631\u06cc\u062f!!!","video":"1500804433_oneRepublic.mp4","video_title":"\u0646\u0645\u0648\u0646\u0647 \u0622\u0645\u0648\u0632\u0634 \u06af\u06cc\u062a\u0627\u0631","teacher_image":"1500802882_maxresdefault.jpg","teacher_name":"\u0648\u0627\u0646 \u0631\u06cc\u067e\u0627\u0628\u0644\u06cc\u06a9","teacher_bio":"\u06af\u0631\u0648\u0647 \u0648\u0627\u0646 \u0631\u06cc\u067e\u0627\u0628\u0644\u06cc\u06a9 \u0634\u0627\u0645\u0644 5 \u0639\u0636\u0648","status":1,"created_at":"2017-06-29 17:35:09","updated_at":"2017-07-23 05:37:13"}]}
#Reinier Melian
solved:
func getFirstPageApplication(EMPTY:String,completionHandler: #escaping (_ response: AnyObject) -> ())
{
var strResponse = "null"
var request = URLRequest(url: URL(string: self.baseURL+"getFirstPageApplication")!)
request.httpMethod = "POST"
let postString = "EMAIL=\(EMPTY)"
request.httpBody = postString.data(using: .utf8)
let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
if error != nil {
DispatchQueue.main.async {
completionHandler({} as AnyObject)
}
} else {
if let usableData = data {
do {
let jsonResult = try JSONSerialization.jsonObject(with: usableData, options:
JSONSerialization.ReadingOptions.mutableContainers)
//print("worked")
//print(jsonResult) //this part works fine
DispatchQueue.main.async {
completionHandler(jsonResult as AnyObject)
}
} catch {
DispatchQueue.main.async {
completionHandler({} as AnyObject)
}
print("JSON Processing Failed")
}
}
}
}
task.resume()
}
Try using AnyObject instead of String in your completion handler and add JSONSerialization to serialize to json
func getFirstPageApplication(EMPTY:String,completionHandler: #escaping (_ response: AnyObject) -> ())
{
var strResponse = "null"
var request = URLRequest(url: URL(string: self.baseURL+"getFirstPageApplication")!)
request.httpMethod = "GET"
let postString = "EMAIL=\(EMPTY)"
request.httpBody = postString.data(using: .utf8)
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else { // check for fundamental networking error
print("error=\(error)")
return
}
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 { // check for http errors
print("statusCode should be 200, but is \(httpStatus.statusCode)")
print("response = \(response)")
}
do {
let json:AnyObject? = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary
if let parseJSON = json{
print(parseJSON)
}
completionHandler(parseJSON)
}
}
task.resume()
}
Then you must be able to use this without problems
func initialFirstView()
{
RestApiManager.sharedInstance.getFirstPageApplication(EMPTY:"-"){
response in
print("res: \(response["sliders"])")
}
}
This code is not tested, so please let me know if works
Hope this helps
I am trying to download webcontent for a weather app that I am making. When I run the app the source code on the website does not appear on my Xcode. I also updated my info.plist to accept web content.
Do you have an idea on what the problem is and how I can solve it?
I have a copied my code below:
override func viewDidLoad() {
super.viewDidLoad()
let url = NSURL(string: "http://weather.weatherbug.com/weather-forecast/now/abuja")!
let request = NSMutableURLRequest(url:url as URL)
let task = URLSession.shared.dataTask(with: request as URLRequest) {
data, response, error in
if error != nil{
print(error.debugDescription)
}
else {
if let unwrappedData = data{
let dataString = NSString(data: unwrappedData, encoding: String.Encoding.utf8.rawValue)
print(dataString as Any)
}
}
}
task.resume()
}
Change your url to use https and it should work.
let url = NSURL(string: "https://weather.weatherbug.com/weather-forecast/now/abuja")!
Here's an example in Swift 4 for downloading a document and parsing as JSON:
// If you're doing this in an Xcode Playground, uncomment these lines:
// import XCPlayground
// XCPSetExecutionShouldContinueIndefinitely()
let url = URL(string: "http://json-schema.org/example/geo.json")!
let task = URLSession.shared.dataTask(with: url) {
data, response, error in
guard error == nil else { return }
guard data != nil else { return }
guard (response as? HTTPURLResponse)?.statusCode == 200 else { return }
do {
if let json = try JSONSerialization.jsonObject(with: data!, options: []) as? [String: Any] {
print(json)
}
} catch { return }
}
task.resume()
Use "if let" instead of only "let" and it should work.
if let url = URL(string:"http://weather.weatherbug.com/weather-forecast/now/abuja"){
let request = NSMutableURLRequest(url: url)
let task = URLSession.shared.dataTask(with: request as URLRequest){
data, responds, error in
if error != nil{
print(error!)
} else {
if let unwrappedData = data {
let dataString = NSString(data: unwrappedData, encoding: String.Encoding.utf8.rawValue)
print(dataString!)
DispatchQueue.main.sync(execute: {
})
}
}
}
task.resume()
}
Use
let myURLString = "http://weather.weatherbug.com/weather-forecast/now/abuja"
guard let myURL = URL(string: myURLString) else {
print("Error: \(myURLString) doesn't seem to be a valid URL")
return
}
do {
let myHTMLString = try String(contentsOf: myURL, encoding: .ascii)
print("HTML : \(myHTMLString)")
} catch let error {
print("Error: \(error)")
}
From Link
I have JSON looking like this:
{"posts":
[
{
"id":"1","title":"title 1"
},
{
"id":"2","title":"title 2"
},
{
"id":"3","title":"title 3"
},
{
"id":"4","title":"title 4"
},
{
"id":"5","title":"title 5"
}
],
"text":"Some text",
"result":1
}
How can I parse that JSON with Swift 3?
I have this:
let url = URL(string: "http://domain.com/file.php")!
let request = URLRequest(url: url)
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data else {
print("request failed \(error)")
return
}
do {
if let json = try JSONSerialization.jsonObject(with: data) as? [String: String], let result = json["result"] {
// Parse JSON
}
} catch let parseError {
print("parsing error: \(parseError)")
let responseString = String(data: data, encoding: .utf8)
print("raw response: \(responseString)")
}
}
task.resume()
}
Use this to parse your data:
let url = URL(string: "http://example.com/file.php")
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) as! [String:Any]
let posts = json["posts"] as? [[String: Any]] ?? []
print(posts)
} catch let error as NSError {
print(error)
}
}).resume()
Use guard to check if you have data and that error is empty.
Swift 5.x version
let url = URL(string: "http://example.com/file.php")
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) as? [String:Any]
let posts = json?["posts"] as? [[String: Any]] ?? []
print(posts)
} catch {
print(error)
}
}).resume()
In swift 3.0 for GET method:
var request = URLRequest(url: URL(string: "Your URL")!)
request.httpMethod = "GET"
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else { // check for fundamental networking error
print("error=\(String(describing: error))")
return
}
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 { // check for http errors
print("statusCode should be 200, but is \(httpStatus.statusCode)")
print("response = \(String(describing: response))")
}
let responseString = String(data: data, encoding: .utf8)
print("responseString = \(String(describing: responseString))")
}
task.resume()
In swift 3.0 for POST method:
var request = URLRequest(url: URL(string: "Your URL")!)
request.httpMethod = "POST"
let postString = "user_name=ABC" // Your parameter
request.httpBody = postString.data(using: .utf8)
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else { // check for fundamental networking error
print("error=\(String(describing: error))")
return
}
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 { // check for http errors
print("statusCode should be 200, but is \(httpStatus.statusCode)")
print("response = \(String(describing: response))")
}
let responseString = String(data: data, encoding: .utf8)
print("responseString = \(String(describing: responseString))")
}
task.resume()
Because your data structure of test json should be "[String: AnyObject]". The json key "posts" value is Array type.
DISTANCE--DIFFICULT API
========================>
class ViewController: UIViewController {
var get_data = NSMutableData()
var get_dest = NSArray()
var org_add = NSArray()
var row_arr = NSArray()
var ele_arr = NSArray()
var ele_dic = NSDictionary()
var dist_dic = NSDictionary()
var dur_dic = NSDictionary()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
getmethod()
}
func getmethod()
{
let url_str = URL(string: "https://maps.googleapis.com/maps/api/distancematrix/json?units=imperial&departure_time=1408046331&origins=37.407585,-122.145287&destinations=37.482890,-122.150235")
let url_req = URLRequest(url: url_str!)
let task = URLSession.shared.dataTask(with: url_req) { (data, response, error) in
if let my_data = data
{
print("my data is----->",my_data)
do
{
self.get_data.append(my_data)
let jsondata = try JSONSerialization.jsonObject(with: self.get_data as Data, options: [])as! NSDictionary
print("json data is--->",jsondata)
self.get_dest = jsondata.object(forKey: "destination_addresses")as! NSArray
let get_dest1:String = self.get_dest.object(at: 0) as! String
print("destination is--->",get_dest1)
self.org_add = jsondata.object(forKey: "origin_addresses")as! NSArray
let get_org:String = self.org_add.object(at: 0)as! String
print("original address is--->",get_org)
self.row_arr = jsondata.object(forKey: "rows")as! NSArray
let row_dic = self.row_arr.object(at: 0)as! NSDictionary
self.ele_arr = row_dic.object(forKey: "elements")as! NSArray
self.ele_dic = self.ele_arr.object(at: 0)as! NSDictionary
self.dist_dic = self.ele_dic.value(forKey: "distance")as! NSDictionary
print("distance text is--->",self.dist_dic.object(forKey: "text")as! String)
print("distance value is--->",self.dist_dic.object(forKey: "value")as! Int)
// self.ele_dic = self.ele_arr.object(at: 1)as! NSDictionary
self.dur_dic = self.ele_dic.value(forKey: "duration")as! NSDictionary
print("duration text--->",self.dur_dic.value(forKey: "text")as! String)
print("duration value--->",self.dur_dic.value(forKey: "value")as! Int)
print("status---->",self.ele_dic.object(forKey: "status")as! String)
}
catch
{
print("error is--->",error.localizedDescription)
}
}
};task.resume()
}
I adapted this from Ray Wenderlich's iOS Apprentice tutorial part 4.
This code works as a GET request sent to my Strongloop API with a simple database model, however:
This works, but I don't know why it works, since it invokes no method that I can see to actually send the request.
I see no means to make it into a POST request.
My question is: How do I perform a POST request? Is it done in a completely different way?
Let me know if you need more information.
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func getFromDB() {
let url = urlWithSearchText("")
println("URL: '\(url)'")
if let jsonString = performGetRequestWithURL(url) {
println("Received JSON string '\(jsonString)'")
}
}
func urlWithSearchText(searchText: String) -> NSURL {
let escapedSearchText = searchText.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)!
let urlString = String(format: "http://localhost:3000/api/Tests", escapedSearchText)
let url = NSURL(string: urlString)
return url!
}
func performGetRequestWithURL(url: NSURL) -> String? {
var error: NSError?
if let resultString = String(contentsOfURL: url, encoding: NSUTF8StringEncoding, error: &error) {
return resultString
} else if let error = error {
println("Download Error: \(error)")
} else {
println("Unknown Download Error")
}
return nil
}
Here is a picture of this working:
https://dl.dropboxusercontent.com/u/14464971/Images/Messages%20Image%281477993527%29.png
Swift 3 & above
GET
func getRequest() {
// request url
let url = URL(string: "https://jsonplaceholder.typicode.com/todos/1")! // change the url
// create URLSession with default configuration
let session = URLSession.shared
// create dataTask using the session object to send data to the server
let task = session.dataTask(with: url) { data, response, error in
if let error = error {
print("GET Request Error: \(error.localizedDescription)")
return
}
// ensure there is valid response code returned from this HTTP response
guard let httpResponse = response as? HTTPURLResponse,
(200...299).contains(httpResponse.statusCode) else {
print("Invalid Response received from the server")
return
}
// ensure there is data returned
guard let responseData = data else {
print("nil Data received from the server")
return
}
do {
// serialise the data object into Dictionary [String : Any]
if let jsonResponse = try JSONSerialization.jsonObject(with: responseData, options: .mutableContainers) as? [String: Any] {
print(jsonResponse)
} else {
print("data maybe corrupted or in wrong format")
throw URLError(.badServerResponse)
}
} catch let error {
print("JSON Parsing Error: \(error.localizedDescription)")
}
}
// resume the task
task.resume()
}
POST
func postRequest() {
// declare the parameter as a dictionary that contains string as key and value combination. considering inputs are valid
let parameters: [String: Any] = ["name": "abc", "password": "password#123"]
// create the url with URL
let url = URL(string: "http://myServerName.com/api")! //change the url
// create the session object
let session = URLSession.shared
// now create the URLRequest object using the url object
var request = URLRequest(url: url)
request.httpMethod = "POST" //set http method as POST
// add headers for the request
request.addValue("application/json", forHTTPHeaderField: "Content-Type") // change as per server requirements
request.addValue("application/json", forHTTPHeaderField: "Accept")
do {
// convert parameters to Data and assign dictionary to httpBody of request
request.httpBody = try JSONSerialization.data(withJSONObject: parameters, options: .prettyPrinted)
} catch let error {
print(error.localizedDescription)
return
}
// create dataTask using the session object to send data to the server
let task = session.dataTask(with: request) { data, response, error in
if let error = error {
print("Post Request Error: \(error.localizedDescription)")
return
}
// ensure there is valid response code returned from this HTTP response
guard let httpResponse = response as? HTTPURLResponse,
(200...299).contains(httpResponse.statusCode)
else {
print("Invalid Response received from the server")
return
}
// ensure there is data returned
guard let responseData = data else {
print("nil Data received from the server")
return
}
do {
// create json object from data or use JSONDecoder to convert to Model stuct
if let jsonResponse = try JSONSerialization.jsonObject(with: responseData, options: .mutableContainers) as? [String: Any] {
print(jsonResponse)
// handle json response
} else {
print("data maybe corrupted or in wrong format")
throw URLError(.badServerResponse)
}
} catch let error {
print(error.localizedDescription)
}
}
task.resume()
}
Below are two POST methods. Depending on if you want it synchronous (everything else waits until the post method is completed) or asynchronous (POST method runs in background, other methods run in parallel).
Methods
// POST data to url
func postDataAsynchronous(url: String, bodyData: String, completionHandler: (responseString: String!, error: NSError!) -> ()) {
var URL: NSURL = NSURL(string: url)!
var request:NSMutableURLRequest = NSMutableURLRequest(URL:URL)
request.HTTPMethod = "POST";
request.HTTPBody = bodyData.dataUsingEncoding(NSUTF8StringEncoding);
NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()){
response, data, error in
var output: String!
if data != nil {
output = NSString(data: data, encoding: NSUTF8StringEncoding) as! String
}
completionHandler(responseString: output, error: error)
}
}
// Obtain the data
func postDataSynchronous(url: String, bodyData: String, completionHandler: (responseString: String!, error: NSError!) -> ())
{
let URL: NSURL = NSURL(string: url)!
var request:NSMutableURLRequest = NSMutableURLRequest(URL:URL)
request.HTTPMethod = "POST"
request.HTTPBody = bodyData.dataUsingEncoding(NSUTF8StringEncoding);
request.addValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
var response: NSURLResponse?
var error: NSError?
// Send data
let data = NSURLConnection.sendSynchronousRequest(request, returningResponse: &response, error: &error)
var output: String! // Default to nil
if data != nil{
output = NSString(data: data!, encoding: NSUTF8StringEncoding) as! String
}
completionHandler(responseString: output, error: error)
}
Using them
You can then call (use) them like so:
postDataSynchronous(url, bodyData: bodyData) {
responseString, error in
if error != nil {
println("Error during post: \(error)")
return
}
else{
//Success
println(responseString)
userType = responseString // Set usertype based on server response
}
}
SWIFT 2.0
func postData(url: String, params: Dictionary<String, String>, completionHandler: (data: NSData?, response: NSURLResponse?, error: NSError?) -> ()) {
// Indicate download
UIApplication.sharedApplication().networkActivityIndicatorVisible = true
let url = NSURL(string: url)!
// print("URL: \(url)")
let request = NSMutableURLRequest(URL: url)
let session = NSURLSession.sharedSession()
request.HTTPMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
// Verify downloading data is allowed
do {
request.HTTPBody = try NSJSONSerialization.dataWithJSONObject(params, options: [])
} catch let error as NSError {
print("Error in request post: \(error)")
request.HTTPBody = nil
} catch {
print("Catch all error: \(error)")
}
// Post the data
let task = session.dataTaskWithRequest(request) { data, response, error in
completionHandler(data: data, response: response, error: error)
// Stop download indication
UIApplication.sharedApplication().networkActivityIndicatorVisible = false // Stop download indication
}
task.resume()
}
guard let url = URL(string: "https://jsonplaceholder.typicode.com/users") else { return }
let session = URLSession.shared
session.dataTask(with: url) { (data, response, error) in
if let response = response {
print(response)
}
if let data = data {
print(data)
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
print(json)
} catch {
print(error)
}
}
}.resume()
}
It's a get method.
This method invokes the http request.
String(contentsOfURL: url, encoding: NSUTF8StringEncoding, error: &error)
Because Swift String has no init signature like this.
This method would be written somewhere in the project, as extension of String
It would be something like this
extension String{
init(contentsOfURL: NSURL, encoding: NSUTF8StringEncoding, inout error: NSError){
// load data from url
self = //parse data to string
}
}
The String(contentsOfUrl:encoding:error) initializer makes a GET request under the hood and returns the content as a string with the specified encoding.
One way to make a request would be to create an NSURLConnection and use NSMutablrURLRequest set the HTTP method the post. With the NSMutableURLRequest, you can create a NSURLConnection and start it immediately with a delegate or you can call NSURLConnection.sendSynchronousRequest or NSURLConnection.sendAsynchronousRequest to send the request.
let parameters = ["username": "#Bipin_kumar", "tweet": "HelloWorld"]
guard let url = URL(string: "https://jsonplaceholder.typicode.com/posts") else { return }
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
guard let httpBody = try? JSONSerialization.data(withJSONObject: parameters, options: []) else { return }
request.httpBody = httpBody
let session = URLSession.shared
session.dataTask(with: request) { (data, response, error) in
if let response = response {
print(response)
}
if let data = data {
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
print(json)
} catch {
print(error)
}
}
}.resume()
It's a post method.
GET Request
func getRequest(with url: URL, callback: #escaping (Any?) -> Swift.Void) -> Void {
let defaultConfigObject = URLSessionConfiguration.default
defaultConfigObject.timeoutIntervalForRequest = 30.0
defaultConfigObject.timeoutIntervalForResource = 60.0
let session = URLSession.init(configuration: defaultConfigObject, delegate: nil, delegateQueue: nil)
var urlRequest = URLRequest(url: url as URL)
urlRequest.addValue("application/json", forHTTPHeaderField: "Content-Type")
urlRequest.httpMethod = "GET"
session.dataTask(with: urlRequest, completionHandler: { (data, response, error) in
guard let httpResponse: HTTPURLResponse = response as? HTTPURLResponse
else {
print("Error: did not receive data")
return
}
var response : (Any)? = nil
if httpResponse.statusCode == 200 {
print(httpResponse)
guard let responseData = data else {
print("Error: did not receive data")
return
}
do {
let responseData = try JSONSerialization.jsonObject(with: responseData, options: [JSONSerialization.ReadingOptions.allowFragments])
response = responseData
callback(response)
}
catch _ as NSError {
let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
callback(responseString)
return
}
}
else {
print(httpResponse)
guard error == nil else {
print("error calling GET on /todos/1")
print(error ?? "error")
callback(response!)
return
}
}
}).resume()
}
POST REQUEST
//MARK: post request
func postRequest(with url:URL, postBody:String, callback: #escaping (Any?) -> Void) -> Void {
let defaultConfigObject = URLSessionConfiguration.default
defaultConfigObject.timeoutIntervalForRequest = 30.0
defaultConfigObject.timeoutIntervalForResource = 60.0
let session = URLSession.init(configuration: defaultConfigObject, delegate: nil, delegateQueue: nil)
let params: String! = postBody
var urlRequest = URLRequest(url: url as URL)
urlRequest.httpMethod = "POST"
let data = params.data(using: String.Encoding(rawValue: String.Encoding.utf8.rawValue))
urlRequest.httpBody = data
session.dataTask(with: urlRequest, completionHandler: { (data, urlResponse, error) in
guard let httpResponse:HTTPURLResponse = urlResponse as? HTTPURLResponse
else{
print("did not get any data")
return
}
var response : (Any)? = nil
if httpResponse.statusCode == 200 {
guard let responseData = data else {
print("Error: did not receive data")
return
}
do {
guard let responseData = try JSONSerialization.jsonObject(with: responseData, options: []) as? [String: AnyObject] else {
print("error trying to convert data to JSON")
return
}
response = responseData
callback(response)
} catch _ as NSError {
let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
callback(responseString)
return
}
}
else {
guard error == nil else {
print("error calling GET on /todos/1")
print(error ?? "error")
callback(nil)
return
}
}
}).resume()
}
Always try to check the HTTPURLResponse code