I'm using the YouTube Data API and Alamofire to display my YouTube channel's videos and they update dynamicly. Here's my code:
func getFeedVideo() {
Alamofire.request("https://www.googleapis.com/youtube/v3/playlists", parameters: parameters, encoding: URLEncoding.default, headers: nil).responseJSON { (response) in
if let JSON = response.result.value {
if let dictionary = JSON as? [String: Any] {
var arrayOfVideos = [Video]()
for video in dictionary["items"] as! NSArray {
// Create video objects off of the JSON response
let videoObj = Video()
videoObj.videoID = (video as AnyObject).value(forKeyPath: "snippet.resourceId.videoId") as! String
videoObj.videoTitle = (video as AnyObject).value(forKeyPath: "snippet.title") as! String
videoObj.videoDescription = (video as AnyObject).value(forKeyPath: "snippet.description") as! String
videoObj.videoThumbnailUrl = (video as AnyObject).value(forKeyPath: "snippet.thumbnails.maxres.url") as! String
arrayOfVideos.append(videoObj)
}
self.videoArray = arrayOfVideos
if self.delegate != nil {
self.delegate!.dataReady()
}
}
}
}
}
I'm getting an error
Thread 1: EXC_BAD_INSTRUCTION
on the line for video in dictionary["items"] as! NSArray {. In the console, I see
fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb)
The data is being displayed in a UITableView. Any ideas on how to fix this?
Please don't use force type cast. It may cause your app crash. Always use if let or guard let. Try to iterate it like that
if let dictionary = JSON as? [String: Any] {
var arrayOfVideos = [Video]()
if let playlist = dictionary["items"] as? [Any] {
for i in 0..<playlist.count {
let videoObj = Video()
if let video = playlist[i] as? [String: Any] {
if let videoId = video["id"] as? String {
videoObj.videoID = videoId
}
if let snippet = video["snippet"] as? [String: Any] {
if let videoTitle = snippet["title"] as? String {
videoObj.videoTitle = videoTitle
}
if let videoDescription = snippet["description"] as? String {
videoObj.videoDescription = videoDescription
}
}
if let thumbnails = video["thumbnails"] as? [String: Any]{
if let maxres = thumbnails["maxres"] as? [String: Any] {
if let url = maxres["url"] as? String {
videoObj.videoThumbnailUrl = url
}
}
}
arrayOfVideos.append(videoObj)
}
}
}
}
This means that you do not have a value for items in your dictionary, or you are accessing it improperly.
You're trying to make a force cast to NSArray. This will crash you app if dictionary["items"] is not a NSArray.
I recommend you to put a break point before the loop to check the type of your dictionary["items"].
Example:
guard let items = dictionary["items"] as? NSArray else { return }
Related
In this order detail array i am having 10 dictionaries but i need to display only first dictionary can any one help me how to implement this ?
http://www.json-generator.com/api/json/get/bUKEESvnvS?indent=2
here is my code shown below
func downloadJsonWithURL() {
let url = NSURL(string: self.url)
URLSession.shared.dataTask(with: (url as URL?)!, completionHandler: {(data, response, error) -> Void in
if let jsonObj = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? NSDictionary {
self.orderdetailsArray = (jsonObj!.value(forKey: "Orders detail") as? [[String: AnyObject]])!
for array in self.orderdetailsArray {
let key = "OrderId"
let value = "#1000501"
for (key,value) in array{
if let addressDict = array as? NSDictionary{
if let orderid = addressDict.value(forKey: "OrderId"){
self.orderid.append(orderid as! String)
}
if let orderdate = addressDict.value(forKey: "OrderDate"){
self.orderdate.append(orderdate as! String)
}
if let subtotal = addressDict.value(forKey: "SubTotal"){
self.subTotal.append(subtotal as! Int)
}
if let Shipping = addressDict.value(forKey: "Shipping"){
self.shippingPrice.append(Shipping as! Int)
}
if let tax = addressDict.value(forKey: "Tax"){
self.tax.append(tax as! Int)
}
if let grandtotal = addressDict.value(forKey: "GrandTotal"){
self.grandTotal.append(grandtotal as! Int)
}
if let shippingAddress = addressDict.value(forKey: "ShippingAddress"){
self.shippingAddress.append(shippingAddress as AnyObject)
}
if let shippingMethod = addressDict.value(forKey: "ShippingMethod"){
self.shippingMethod.append(shippingMethod as AnyObject)
}
if let billingAddress = addressDict.value(forKey: "BillingAddress"){
self.billingAddress.append(billingAddress as AnyObject)
}
if let paymentMethod = addressDict.value(forKey: "PayMentMethod"){
self.paymentMethod.append(paymentMethod as AnyObject)
}
self.itemsArray = addressDict.value(forKey: "Items detail") as! [[String : AnyObject]]
}
}
}
OperationQueue.main.addOperation({
self.tableDetails.reloadData()
})
}
}).resume()
}
Do this. :
let jsonObj = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? NSDictionary
guard let Ordersdetail = jsonObj["Orders detail"] as? [NSDictionary] else {
print("Cannot find key 'Orderdetails' in \(jsonObj)")
return
}
To access the contents of the first dictionary do this:
var orderid = Ordersdetail[0]["OrderId"]!
var shippingadress = Ordersdetail[0]["ShippingAddress"]!
var total = Ordersdetail[0]["GrandTotal"]!
var subtotal = Ordersdetail[0]["SubTotal"]!
var tax = Ordersdetail[0]["Tax"]!
var shipping = Ordersdetail[0]["Shipping"]!
Hi if you want first dictionary of that
self.orderdetailsArray
then
if let firstDictInfo = self.orderdetailsArray.first as? [String:Any] {
// Do your stuff here
print(firstDictInfo["OrderId"])
}
Instead of looping through the whole dictionary is dictionaries, you should just take the first dictionary and only parse that. There was also quite a few other conceptual problems with your code. In Swift, don't use NSDictionary, but use the native Swift version, Dictionary, which keeps the type information of its contents. Also, use conditional casting to make sure your program doesn't crash even if the received data is wrong/unexpected and don't use force unwrapping of optionals.
Also, when parsing a JSON response in Swift, in general it is not necessary and not a good idea to iterate through the key-value pairs of the dictionaries in the response. You should know what data structure you expect, otherwise you can't parse it properly and since you can directly access dictionary values in Swift if you know the key it corresponds to, there's no need to iterate through the dictionary in a loop.
func downloadJsonWithURL() {
let url = URL(string: self.url)
URLSession.shared.dataTask(with: url!, completionHandler: {(data, response, error) -> Void in
if let jsonObj = (try? JSONSerialization.jsonObject(with: data!, options: .allowFragments)) as? [String:Any] {
guard let self.orderdetailsArray = jsonObj["Orders detail"] as? [[String: AnyObject]] else {return}
guard let firstOrderDetails = self.orderdetailsArray.first else {return}
let key = "OrderId"
let value = "#1000501"
if let ordered = firstOrderDetails["OrderId] as? String {
self.orderid.append(orderid)
}
if let orderdate = firstOrderDetails["OrderDate"] as? String{
self.orderdate.append(orderdate)
}
if let subtotal = firstOrderDetails["SubTotal"] as? Int{
self.subTotal.append(subtotal)
}
if let shipping = firstOrderDetails["Shipping"] as? Int{
self.shippingPrice.append(shipping)
}
if let tax = firstOrderDetails["Tax"] as? Int{
self.tax.append(tax)
}
if let grandtotal = firstOrderDetails["GrandTotal"] as? Int{
self.grandTotal.append(grandtotal)
}
if let shippingAddress = firstOrderDetails[ "ShippingAddress"] as? AnyObject{ //why don't you store it as a String?
self.shippingAddress.append(shippingAddress)
}
if let shippingMethod = firstOrderDetails[ "ShippingMethod"] as? AnyObject{
self.shippingMethod.append(shippingMethod)
}
if let billingAddress = firstOrderDetails[ "BillingAddress"] as? AnyObject {
self.billingAddress.append(billingAddress)
}
if let paymentMethod = firstOrderDetails ["PayMentMethod"] as? AnyObject{
self.paymentMethod.append(paymentMethod)
}
guard let itemDetails = firstOrderDetails["Items detail"] as? [[String : AnyObject]] else {return}
self.itemsArray = itemDetails
}
}
}
OperationQueue.main.addOperation({
self.tableDetails.reloadData()
})
}
}).resume()
}
I haven't compiled and run the code, so make sure you check for any typos/inconsistencies. Also, make sure you change the types of the objects you store are AnyObjects to specific types.
I want to parse JSON in UICollectionviewCell. I have a collectionViewController with two UICollectionviewCell. In collectionViewController first cell made to background scrolling and in the second I want to parse JSON. There is no error in the code, this is my JSON code.
var oCategoryFilter: CategoryFilter? {
didSet {
if let name = oCategoryFilter?.totalItem {
totalItemLabel.text = name
}
appsCollectionView.reloadData()
}
}
var arrProduct: [Product]?
func getPropductListByCategory(){
let category_id:String;
category_id = "21"
let url = URL(string: UtilityController.BASE_URL+"/products/"+category_id)
URLSession.shared.dataTask(with:url!) { (urlContent, response, error) in
if error != nil {
print(error)
}
else {
do {
let json = try JSONSerialization.jsonObject(with: urlContent!) as! [String:Any]
print(json)
let items = json["categories"] as? [[String: Any]] ?? []
items.forEach { item in
let oProduct = Product()
//oProduct.id = item["id"] as? String
oProduct.image = item["image"] as? String
oProduct.name = item["name"] as? String
oProduct.ar_name = item["ar_name"] as? String
//oProduct.description = item["description"] as? String
oProduct.ar_description = item["ar_description"] as? String
oProduct.price = item["price"] as? String
oProduct.quantity = item["quantity"] as? String
oProduct.is_featured = item["is_featured"] as? String
oProduct.seller_id = item["seller_id"] as? String
oProduct.payment_required = item["payment_required"] as? String
oProduct.is_editors_choice = item["is_editors_choice"] as? String
oProduct.created_at = item["created_at"] as? String
oProduct.updated_at = item["updated_at"] as? String
self.arrProduct?.append(oProduct)
}
print(url)
} catch let error as NSError {
print(error)
}
}
DispatchQueue.main.async(execute: {
self.appsCollectionView.reloadData()
})
}.resume()
}
When are you calling your functions ? You should call the method in the CollectionView, when it is loading every cell, but doing that is really bad, because each time you will scroll or reload your CollectionView it will parse again.
You should parse in a special class, call by the collection view and this last send the parse object to the cell.
Hi I'm trying to get data from a certain JSON API. I can gat a snapshot of all values from the API, which is shown below. But I can't manage to put a specifiek row in a variable. This is the JSON form which I get. I want to print the "Description" value.Can someone help me with this?
And Hier is my code:
func apiRequest() {
let config = URLSessionConfiguration.default
let username = "F44C3FC2-91AF-5FB2-8B3F-70397C0D447D"
let password = "G23#rE9t1#"
let loginString = String(format: "%#:%#", username, password)
let userPasswordData = loginString.data(using: String.Encoding.utf8)
let base64EncodedCredential = userPasswordData?.base64EncodedString()
let authString = "Basic " + (base64EncodedCredential)!
print(authString)
config.httpAdditionalHeaders = ["Authorization" : authString]
let session = URLSession(configuration: config)
var running = false
let url = NSURL(string: "https://start.jamespro.nl/v4/api/json/projects/?limit=10")
let task = session.dataTask(with: url! as URL) {
( data, response, error) in
if let taskHeader = response as? HTTPURLResponse {
print(taskHeader.statusCode)
}
if error != nil {
print("There is an error!!!")
print(error)
} else {
if let content = data {
do {
let array = try JSONSerialization.jsonObject(with: content, options: JSONSerialization.ReadingOptions.mutableContainers) as AnyObject
print(array)
if let items = array["items"] {
if let description = items["Description"] as? [[String:Any]]{
print(description as Any)
}
}
}
catch {
print("Error: Could not get any data")
}
}
}
running = false
}
running = true
task.resume()
while running {
print("waiting...")
sleep(1)
}
}
First of all the array is not an array and not AnyObject, it's a dictionary which is [String:Any] in Swift 3.
let dictionary = try JSONSerialization.jsonObject(with: content) as! [String:Any]
print(dictionary)
I don't know why all tutorials suggest .mutableContainers as option. That might be useful in Objective-C but is completely meaningless in Swift. Omit the parameter.
The object for key itemsis an array of dictionaries (again, the unspecified JSON type in Swift 3 is Any). Use a repeat loop to get all description values and you have to downcast all values of a dictionary from Any to the expected type.
if let items = dictionary["items"] as? [[String:Any]] {
for item in items {
if let description = item["Description"] as? String {
print(description)
}
}
}
Looks like items is an array that needs to be looped through. Here is some sample code, but I want to warn you that this code is not tested for your data.
if let items = array["items"] as? [[String: AnyObject]] {
for item in items {
if let description = item["Description"] as? String{
print("Description: \(description)")
}
}
}
This code above, or some variation of it, should get you on the right track.
use the SwiftyJSON and it would be as easy as json["items"][i].arrayValue as return and array with items Values or json["items"][i]["description"].stringValue to get a string from a row
I am trying to check the version of my app with the iTunes lookup api. I have problems in parsing the response. Please find the code
static func needsUpdate() -> Bool
{
do {
let infoDictionary = Bundle.main.infoDictionary
let appID = infoDictionary?["CFBundleIdentifier"]
let url:URL = URL(string: "http://itunes.apple.com/lookup?bundleId=\(appID!)")!
let data = try Data(contentsOf: url)
let lookup = try JSONSerialization.jsonObject(with:data, options: []) as! [String:AnyObject]
print(lookup)
let resultCount:Int = lookup["resultCount"] as! Int
if (resultCount == 1)
{
var results = lookup["results"] as! [String:AnyObject] // ***Error***
if results.isEmpty
{
print(results)
}
}
} catch
{
}
return true
}
Please let me know how can i parse this response
The error message clearly reveals that the value for results is an array.
let results = lookup["results"] as! [[String:Any]]
And consider that a JSON dictionary is [String:Any] in Swift 3
I am trying to parse some json data into three different arrays based off the label in the json. I seem to be stuck and don't know why my for loop is never being entered. I am new to iOS and am using this to learn swift. Any help will be appreciated.
Here is the code that I am using:
var myPicture = [String]()
var myPath = [String]()
var mylabel = [String]()
let jsonString = "[{\"picture\" : \"Picture 1 \", \"path\": \"Path 1\" , \"label\" : \"Label 1\"}]"
//Convert jsonString to NSData
let myData = jsonString.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!
do{
let promoJson = try NSJSONSerialization.JSONObjectWithData(myData, options:.AllowFragments)
if let promtions = promoJson[""] as? [[String: AnyObject]] {
for promtions in promtions {
if let picture = promtions["picture"] as? String
{
myPicture.append(picture)
if let path = promtions["path"] as? String
{
myPath.append(path)
if let label = promtions["label"] as? String
{
mylabel.append(label)
}
}
}
}
}
}catch {
print("Error with Json: \(error)")
}
print(myPicture.first)
print(myPath.first)
print(mylabel.first)
The results for the print are all nil. So nothing is being appended to the arrays
The if let promtions = promoJson[""] part won't work and would be useless anyway. This is only promoJson that you have to cast to an array of dictionaries.
You weren't that far from the solution, look at my working version of your code:
do {
let promoJson = try NSJSONSerialization.JSONObjectWithData(myData, options: [])
if let promtions = promoJson as? [[String: AnyObject]] {
for promtion in promtions {
if let picture = promtion["picture"] as? String {
myPicture.append(picture)
}
if let path = promtion["path"] as? String {
myPath.append(path)
}
if let label = promtion["label"] as? String {
mylabel.append(label)
}
}
}
} catch let error as NSError {
print(error.debugDescription)
}
Alternative
Now that the issue is resolved, let me suggest you another way: instead of separate arrays for your data, use one array of objects holding your data.
For example, make a struct like this:
struct Promotion {
let picture: String
let path: String
let label: String
}
And an array for instances of this struct:
var myPromotions = [Promotion]()
Now we can decode the JSON, create objects from it then store them in the array:
do {
let promoJson = try NSJSONSerialization.JSONObjectWithData(myData, options: [])
if let promtions = promoJson as? [[String: AnyObject]] {
for promtion in promtions {
if let picture = promtion["picture"] as? String,
path = promtion["path"] as? String,
label = promtion["label"] as? String {
let promo = Promotion(picture: picture, path: path, label: label)
myPromotions.append(promo)
}
}
}
} catch let error as NSError {
print(error.debugDescription)
}
Now look at the content of the array, very convenient:
for promo in myPromotions {
print(promo.label)
print(promo.path)
print(promo.picture)
}
When you are converting it is already an array.
import Foundation
import UIKit
var myPicture = [String]()
var myPath = [String]()
var mylabel = [String]()
let jsonString = "[{\"picture\" : \"Picture 1 \", \"path\": \"Path 1\" , \"label\" : \"Label 1\"}]"
//Convert jsonString to NSData
let myData = jsonString.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!
do{
let promoJson = try NSJSONSerialization.JSONObjectWithData(myData, options:.AllowFragments) as! NSArray
for promtions in promoJson {
if let picture = promtions["picture"] as? String
{
myPicture.append(picture)
if let path = promtions["path"] as? String
{
myPath.append(path)
if let label = promtions["label"] as? String
{
mylabel.append(label)
}
}
}
}
}catch
{
print("Error with Json: \(error)")
}
print(myPicture.first) // "Optional("Picture 1 ")\n"
print(myPath.first) // "Optional("Path 1")\n"
print(mylabel.first) // "Optional("Label 1")\n"
This does the job.