I'm working on IOS app in which I'm using localhost Api. Following is my code:
override func viewDidLoad() {
super.viewDidLoad()
guard let url = URL(string: "http://127.0.0.1:8000/api/teams") else {return}
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
guard let dataResponse = data,
error == nil else {
print(error?.localizedDescription ?? "Response Error")
return }
do{
//here dataResponse received from a network request
let jsonResponse = try JSONSerialization.jsonObject(with:
dataResponse, options: [])
guard let jsonArray = jsonResponse as? [[String: Any]] else {
return
}
for team in jsonArray{
guard let name = team["name"] as? String else { return }
guard let country = team["country"] as? String else{return}
self.teamName.append(name)
self.teamCountry.append(country)
print(name,country) //Output
}
} catch let parsingError {
print("Error", parsingError)
}
self.tableView.reloadData()
}
task.resume()
}
The above code is working fine and I'm getting all data loaded in my tableview.
I want that when user select a row it should call another Api to show more detail of the selected screen on another viewcontroller. But when I call my second Api I get following error:
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let storyBoard = UIStoryboard(name: "Main", bundle: nil)
let DvC = storyBoard.instantiateViewController(withIdentifier: "DetailViewController") as! ViewController
guard let url = URL(string: "http://127.0.0.1:8000/api/team/"+teamName[indexPath.row]) else {return}
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
guard let dataResponse = data,
error == nil else {
print(error?.localizedDescription ?? "Response Error")
return }
do{
//here dataResponse received from a network request
let jsonResponse = try JSONSerialization.jsonObject(with:
dataResponse, options: [])
guard let jsonArray = jsonResponse as? [[String: Any]] else {
return
}
guard let name = jsonArray[0]["name"] as? String else { return }
guard let country = jsonArray[0]["country"] as? String else{ return }
DvC.getName = name
DvC.getCountry = country
} catch let parsingError {
print("Error", parsingError)
}
}
task.resume()
self.navigationController?.pushViewController(DvC, animated: true)
}
In my second Api call am getting error like TeamApiScreen[34251:281435] TIC Read Status [5:0x600000178540]: 1:57
Related
I am trying to get the collectionViewCell count from the network request but the value turns out to be always 0 (to which I initialised the count variable) I want the view to load the cells after I get it's count from the get request.What is it I'm doing wrong I have written this code after super.viewDidLoad().
DispatchQueue.global(qos:.background).async {
let token = "---------------------------"
let url = URL(string: "https:----------home.json?token="+token)!
let task = URLSession.shared.dataTask(with: url) {(data, response, error) in
guard let data = data else { return }
// print(String(data: data, encoding: .utf8)!)
let jsonWithObjectRoot = try? JSONSerialization.jsonObject(with: data, options: [])
// print(json!)
if let dictionary = jsonWithObjectRoot as? [String: Any] {
if let data = dictionary["data"] as? [String:Any]{
if let posts = data["posts"] as? [Any]{
count = posts.count
//print(count) //the value here is 2
for object in posts{
if let contentString = object as? [String: Any] {
print(contentString["title"] as! String)
// print(contentString["entered"]as! String)
}
}
}
}
}
}
task.resume()
/* end Request */
DispatchQueue.main.async{
self.collectionView.reloadData()
self.collectionView.collectionViewLayout.invalidateLayout()
}
}
Classic async case. You network calls are async, so your reload should happen inside the completion of the network call.
DispatchQueue.global(qos:.background).async {
let token = "---------------------------"
let url = URL(string: "https:----------home.json?token="+token)!
let task = URLSession.shared.dataTask(with: url) {(data, response, error) in
guard let data = data else { return }
// print(String(data: data, encoding: .utf8)!)
let jsonWithObjectRoot = try? JSONSerialization.jsonObject(with: data, options: [])
// print(json!)
if let dictionary = jsonWithObjectRoot as? [String: Any] {
if let data = dictionary["data"] as? [String:Any]{
if let posts = data["posts"] as? [Any]{
count = posts.count
//print(count) //the value here is 2
DispatchQueue.main.async{
self.collectionView.reloadData()
self.collectionView.collectionViewLayout.invalidateLayout()
}
for object in posts {
if let contentString = object as? [String: Any] {
print(contentString["title"] as! String)
// print(contentString["entered"]as! String)
}
}
}
}
}
}
task.resume()
/* end Request */
}
You have to reload after getting data from the network
count = posts.count
//print(count) //the value here is 2
DispatchQueue.main.async{
self.collectionView.reloadData()
}
So for I've a UITableView in which I'm showing comments which is fetch from my localhost DB, when a user post comment it's send to localhost and store there and it the same time I reload table and the comment is shown it the time but when a user delete a comment or update a comment then in the DB data is actually deleted or updated but my tableview is not reloading with new data till I close the view and open it again.
following is my code.
This my delete comment code:
#objc func deleteComment(){
ProgressHUD.show("Wait Deleting", interaction: false)
customView.removeFromSuperview()
var commentArray : Dictionary<String, Any> = [:]
commentArray["commentId"] = self.getCommentId
let myUrl = URL(string: "http://127.0.0.1:8000/api/comment/delete");
var request = URLRequest(url:myUrl!)
request.httpMethod = "POST"// Compose a query string
request.addValue("application/json", forHTTPHeaderField: "Content-type")
guard let httpbody = try? JSONSerialization.data(withJSONObject: commentArray, options: []) else { return }
request.httpBody = httpbody
let task = URLSession.shared.dataTask(with: request) { (data: Data?, response: URLResponse?, error: Error?) in
if error != nil
{
print("error=\(error)")
return
}
// print out response object
// print("response = \(response)")
//Let's convert response sent from a server side script to a NSDictionary object:
do {
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary
if let parseJSON = json {
if parseJSON["delete"] != nil{
ProgressHUD.dismiss()
self.alertDeleted()
}else {
if parseJSON["error"] != nil{
ProgressHUD.dismiss()
print(parseJSON["error"] as Any)
}
}
}
} catch {
print(error)
}
}
task.resume()
}
This is delete comment alert.
public func alertDeleted(){
let alertController = UIAlertController(title: "Comment Deleted:", message: "Press Ok to continue.", preferredStyle: .alert)
let confirmAction = UIAlertAction(title: "Ok", style: .default) { (_) in
self.showMatchCommentsApiCall()
}
alertController.addAction(confirmAction)
self.present(alertController, animated: true, completion: nil)
}
This is update comment code.
#objc func updateComment(){
ProgressHUD.show("Wait Upating", interaction: false)
updateCommentView.removeFromSuperview()
var commentArray : Dictionary<String, Any> = [:]
commentArray["commentId"] = self.getCommentId
commentArray["updatedComment"] = textView.text
let myUrl = URL(string: "http://127.0.0.1:8000/api/comment/update");
var request = URLRequest(url:myUrl!)
request.httpMethod = "POST"// Compose a query string
request.addValue("application/json", forHTTPHeaderField: "Content-type")
guard let httpbody = try? JSONSerialization.data(withJSONObject: commentArray, options: []) else { return }
request.httpBody = httpbody
let task = URLSession.shared.dataTask(with: request) { (data: Data?, response: URLResponse?, error: Error?) in
if error != nil
{
print("error=\(error)")
return
}
// print out response object
//print("response = \(response)")
//Let's convert response sent from a server side script to a NSDictionary object:
do {
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary
if let parseJSON = json {
if parseJSON["update"] != nil{
ProgressHUD.dismiss()
self.alertCommentUpdated()
self.showMatchCommentsApiCall()
return
}else {
if parseJSON["error"] != nil{
ProgressHUD.dismiss()
print(parseJSON["error"] as Any)
}
}
}
} catch {
print(error)
}
}
task.resume()
}
My ShowMatchCommentsApiCall() function.
public func showMatchCommentsApiCall(){
ProgressHUD.show("Please Wait", interaction: false)
guard let url = URL(string: "http://127.0.0.1:8000/api/matchComments/\(getMatchId)") else {return}
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
guard let dataResponse = data,
error == nil else {
print(error?.localizedDescription ?? "Response Error")
return }
do{
//here dataResponse received from a network request
let jsonResponse = try JSONSerialization.jsonObject(with:
dataResponse, options: [])
// print(jsonResponse) //Response result
guard let jsonArray = jsonResponse as? [[String: Any]] else {
return
}
//print(jsonArray)
for comments in jsonArray{
guard let commentID = comments["commentId"] as? Int else { return }
guard let userID = comments["userId"] as? Int else { return }
guard let userName = comments["userName"] as? String else { return }
let userImgUrl = comments["userImg"] as? String
if userImgUrl != nil{
self.commentsUserImgUrl.append(userImgUrl!)
}else {
self.commentsUserImgUrl.append("nil")
}
guard let commentMessage = comments["comment"] as? String else { return }
self.commentId.append(commentID)
self.commmentsUserId.append(userID)
self.commentsUserName.append(userName)
self.comments.append(commentMessage)
}
} catch let parsingError {
print("Error", parsingError)
}
DispatchQueue.main.async {
self.MatchScoreTable.reloadData()
ProgressHUD.dismiss()
}
}
task.resume()
}
STEP 1. :self.commentsArray.remove(at: indexPath.row)
STEP 2. : self.tableView.deleteRows(at:[indexPath],with:UITableViewRowAnimation.automatic)
STEP 3. : self.tableView.reloadData()
After deleting or updating data just call a UITableView method reloadData
Syntax is as follows :
tableView.reloadData()
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()
}
My error should be quite obvious but I can't find it;
I've a global variable initialized a the beginning of my class:
class InscriptionStageViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
var lesSemaines = [String]()
I try to populate this array with a distant json file using that function
func getSemainesStages(){
let url = URL(string: "http://www.boisdelacambre.be/ios/json/semaines.json")
let task = URLSession.shared.dataTask(with: url!){ (data, response, error) in
if let content = data {
do {
let myJson = try JSONSerialization.jsonObject(with: content, options: JSONSerialization.ReadingOptions.mutableContainers) as AnyObject
let listeSemaines = myJson["semaine"] as! [[String:AnyObject]]
//print(listeSemaines)
for i in 0...listeSemaines.count-1 {
var tabSem = listeSemaines[i]
let intituleSemaine:String = tabSem["intitule"] as! String
//let dateSemaine:String = tabSem["date"] as! String
DispatchQueue.main.sync
{
self.lesSemaines.append(intituleSemaine)
}
}
} catch
{
print("erreur Json")
}
}
}
task.resume()
}
When I call my function in the viewDidLoad and then I print my global array, it's empty (the URL is correct, the json data is read correctly and when I read the data appended in the array in the loop, it print the (so) needed value...)
Thanks in advance
The download takes time. Introduce another methode:
func updateUi() {
print(lesSemaines)
//pickerView.reloadAllComponents()
}
And call it after the download finished:
func getSemainesStages(){
// ... your code
let task = URLSession.shared.dataTask(with: url!){ (data, response, error) in
// ... your code
for tabSem in listeSemaines{
guard let intituleSemaine = tabSem["intitule"] as? String else {
print("erreur Json")
continue
}
self.lesSemaines.append(intituleSemaine)
}
// update UI *after* for loop
DispatchQueue.main.async {
updateUi()
}
// ... your code
}
}
I have updated your code to Swift 3. Please replace it with below code.
func getSemainesStages(){
let url = URL(string: "http://www.boisdelacambre.be/ios/json/semaines.json")
let task = URLSession.shared.dataTask(with: url!){ (data, response, error) in
if let content = data {
do {
let myJson = try JSONSerialization.jsonObject(with: content, options: JSONSerialization.ReadingOptions.mutableContainers) as! [String: Any]
let listeSemaines = myJson["semaine"] as! [[String: Any]]
for i in 0...listeSemaines.count-1 {
var tabSem = listeSemaines[i]
let intituleSemaine:String = tabSem["intitule"] as! String
self.lesSemaines.append(intituleSemaine)
}
print(self.lesSemaines)
} catch {
print("erreur Json")
}
}
}
task.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