I have a very large JSON file that I have downloaded from the web, and I need to parse this in Swift. The JSON construction is an array of dictionaries. Each dictionary object contains a key of "phone" (referring to the phone number), and whose value is the actual phone number in the form of a string.
What I would like to do, is iterate through the entire list of dictionary objects in the array, and ensure that there are no dictionary objects that have the same value for the key, "phone". If a duplicate is found, I would like to eliminate it from the list, and print it out to the console.
Here is the relevant code that I have:
guard let json = try? JSONSerialization.jsonObject(with: data) as? [[String: Any]] else {
print("error")
return
}
for dict in json! {
//This is where I would do the check
}
How would I accomplish this?
You can do as
var ph = [String]()
var newjson = [[String:String]]()
for dict in json {
if ph.contains(dict["Phone"]!) {
print("duplicate phone \(dict["Phone"]!)")
} else {
ph.append(dict["Phone"]!)
newjson.append(dict)
}
}
print(newjson)
Hare newjson is the new array of dictionary that do not have duplicate phone
Use the array extension method to remove the duplicates from the json object
extension Array where Element: Equatable {
mutating func removeDuplicates() {
var result = [Element]()
for value in self {
if !result.contains(value) {
result.append(value)
}
}
self = result
}
}
Alamofire.request(apiURL, method: .get, parameters:parameters, headers:headers)
.responseJSON { response in
if let result = response.result.value {
let json = JSON(result)
var listArray = json["somekey"].arrayValue
listArray.removeDuplicates()
print(listArray)
}
}
Related
I am getting following JSON values in output:
[["category_title": Shelly], ["category_title": Thaddeus],
["category_title": Chantale], ["category_title": Adara],
["category_title": Mariko], ["category_title": Felicia]]
But I want it like below:
["Shelly","Thaddeus","Chantale", "Adara","Mariko","Felicia"]
I have the following Swift code. Please help me get above output.
func successGetTermsData(response: Any){
var UserRole : String = ""
var arrayOfDetails = response as? [[String: Any]] ?? []
UserRole = arrayOfDetails as? String ?? ""
print(arrayOfDetails)
}
You have to map the array of Dictionary arrayOfDetails to an array of String. flatMap ignores a missing key.
if let arrayOfDetails = response as? [[String: String]] {
let userRole = arrayOfDetails.flatMap { $0["category_title"] }
print(userRole)
}
There are many ways to do this. One way is to use flatmap to get just the values in your array of dictionaries:
let arrayOfValues = arrayOfDetails.flatMap { $0.values }
In order to get this to work, the names need to be inside double quotes: "Shelly", etc.
Project files:
https://jumpshare.com/v/Otai3BBXYwfvyz8jb53k
(Would be wise to view these to see structure of project)
Problem:
Ok, so i'm following a tutorial that creates a UITableView with headers and then cell content.
The code worked and runs fine, Now I want to extend beyond that tutorial and dynamically load that content using alamofire and SwiftyJSON.
In the tutorial, the code used is like so:
func getSectionsFromData() -> [Sections] {
var sectionsArray = [Sections]()
let animals = Sections(title: "Animals", objects: ["Cats", "Dogs", "Birds", "Lions"])
sectionsArray.append(animals)
return sectionsArray
}
What I tried to do was:
Alamofire.request(.GET, url).validate().responseJSON { response in
switch response.result {
case .Success:
if let value = response.result.value {
let json = JSON(value)
for (_, subJson) in json {
for (year, content) in subJson {
let title = year
let objects = content
sectionsArray.append(Sections(title: title, objects: objects))
}
}
}
case .Failure(let error):
print(error)
}
}
If I print out the results they show in the console - so I know the getting and looping of the JSON works. I then added in
let title = year
let objects = content
sectionsArray.append(Sections(title: title, objects: objects))
But on this line:
sectionsArray.append(Sections(title: title, objects: objects))
I get this error:
cannot convert value of type 'JSON' to expected argument type '[String]'
Here is the JSON I am using:
{"posts": [
{
"Category1": [
"Post1cat1"
],
"Category2": [
"Post1cat2",
"Post2cat2"
]
}
]}
Can someone help me? I might be going in the wrong direction here I want to loop through the JSON and display the categories as headers and the posts in a cell of a table.
edit: 1/29/2016
so, I changed the loop to:
for (_, subJson) in json {
for (index, data) in subJson {
for (title, objects) in data {
sectionsArray.append(Sections(title: title, objects: objects.self.arrayValue.map { $0.string!}))
}
}
}
Still no luck. When I add in some prints (under: sectionsArray.append) to test if there is data:
print("--")
print(title)
print(objects.self.arrayValue.map { $0.string!})
print(Sections(title: title, objects: objects.self.arrayValue.map { $0.string!}))
I get this result in the console:
--
Category1
["Post1cat1"]
Sections(headings: "Category1", items: ["Post1cat1"])
--
Category2
["Post1cat2", "Post2cat2"]
Sections(headings: "Category2", items: ["Post1cat2", "Post2cat2"])
Which shows that the information is there, however when I run the app there are still no results form he JSON just the originally defined section and cells above.
In second parsing method (after edit), you're iterating on array in last loop, so either you could create array there and add each element separately, as in example:
for (title, data) in subJson {
var elements: [String] = []
for (_, object) in data {
if let stringELement = object.rawString() {
elements.append(stringELement)
}
}
sectionsArray.append(Sections(title: title, objects: elements))
}
or if you prefer you can use casted raw array from JSON object as in this example:
for (_, subJson) in json["posts"] {
for (title, data) in subJson {
let optionalCastedObjects = data.arrayObject as? [String]
let unwrappedObjects = optionalCastedObjects ?? []
let section = Sections(title: title, objects: unwrappedObjects)
sectionsArray.append(section)
}
}
That should fix mentioned compilation issue.
But in the end remember that you're using async callback (in your GET request) in synchronous getSectionsFromData method. And you're always will return array before the values from that callback (clojure) will append new data. That will cause, that you're never display the data that you fetched that way.
UPDATE
To do that you should refactor your getSectionsFromData method as below.
func getSectionsFromData(completion: ([Sections]) -> ()) {
var sectionsArray = [Sections]()
Alamofire.request(.GET, url).validate().responseJSON { response in
switch response.result {
case .Success:
if let value = response.result.value {
let json = JSON(value)
for (_, subJson) in json["posts"] {
for (title, data) in subJson {
let optionalCastedObjects = data.arrayObject as? [String]
let unwrappedObjects = optionalCastedObjects ?? []
let section = Sections(title: title, objects: unwrappedObjects)
sectionsArray.append(section)
}
}
completion(sectionsArray)
}
case .Failure(let error):
print(error)
}
}
}
And relevant parts in your UITableViewController class.
var sections: [Sections] = []
override func viewDidLoad() {
super.viewDidLoad()
SectionsData().getSectionsFromData { [weak self](sections: [Sections]) -> () in
self?.sections = sections
self?.tableView.reloadData()
}
}
Your second loop is on the array object hence in that loop year is index value and content is the object at that index.
You need to implement an additional loop to fix the problem i.e:
for (_, subJson) in json {
for (index, data) in subJson {
for (title, objects) in data {
sectionsArray.append(Sections(title: title, objects: objects.arrayValue.map { $0.string!}))
}
}
}
From the SwiftyJSON documentation:
for (key,subJson):(String, JSON) in json {
//Do something you want
}
This indicates that subJson is of type JSON. However, your Sections constructor in the first example is:
Sections(title: "Animals", objects: ["Cats", "Dogs", "Birds", "Lions"])
In your second example, you're calling it as:
Sections(title: title, objects: objects)
Unless you have changed the constructor, it's expecting objects to be an array of strings, not JSON. This is why you're getting an error saying Swift can't convert JSON to String. In your case, the objects JSON is actually an array of strings, so you need to use something like:
Sections(title: title, objects: objects.arrayValue.map { $0.string!})
I'm Having trouble with JSON and Swift 2.
I'm getting this Array from the server
[{"KidName":"Jacob","KidId":1,"GardenID":0},
{"KidName":"Sarah","KidId":2,"GardenID":0},
{"KidName":"Odel","KidId":3,"GardenID":0}]
I'm familiar with JSON and I know it's not the recommended way to get a JSON, since it's supposed to be something like
{"someArray":[{"KidName":"Jacob","KidId":1,"gardenID":0}, .....
So my first question is it possible to run over the first JSON I've post and get the KidName number without editing the JSON and Add to it a JSON OBJECT to hold the array ?
my second question is really with Swift 2, how can I get the KidName (after I've edited the JSON to have an holder for the array)?
this is my code... (please read the Notes I've added)
BTW, I'm familiar with SwiftyJSON as well...
// Method I've build to get the JSON from Server, the Data is the JSON
sendGetRequest { (response, data ) -> Void in
// need to convert data to String So I can add it an holder
if let str = NSString(data: data, encoding: NSUTF8StringEncoding) as? String {
/**
after editing the str, i'm Having a valid JSON, let's call it fixedJSON
*/
let fixedJSON = "{\"kidsArray\":\(dropLast)}"
// Now I'm converting it to data back again
let jsonTodata = fixedJSON.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!
// After Having the data, I need to convert it to JSON Format
do{
let dataToJson = try NSJSONSerialization.JSONObjectWithData(jsonTodata, options: []) as! [String:AnyObject]
//Here I'm getting the KidID
if let kidID = jsonSe["kidsArray"]![0]["KidId"]!!.integerValue {
print("kidID in first index is: \(kidID)\n")
}
//NOW trying to get the KidName which not working
if let kidname = jsonSe["kidsArray"]![0]["KidName"]!!.stringValue {
print("KidName is \(kidname)\n")
}
}
So as you can see, I'm not able to get the KidName.
Any Help Would be Appreciate.
You can use the following function to get the 'someArray' array and then use this getStringFromJSON function to get the 'KidName' value.
func getArrayFromJSON(data: NSDictionary, key: String) -> NSArray {
if let info = data[key] as? NSArray {
return info
}
else {
return []
}
}
let someArray = self.getArrayFromJSON(YourJSONArray as! NSDictionary, key: "someArray")
func getStringFromJSON(data: NSDictionary, key: String) -> String {
if let info = data[key] as? String {
return info
}
return ""
}
let KidName = self.getStringFromJSON(someArray as! NSDictionary, key: "KidName")
Hope this might be useful to you.
I am trying to parse data which look:
It looks like each record is sequential.. 0, 1, 2 and then within each record there are lots of key value pairs such as the name or showID.
I want to go into each record and only get certain pairs, for example the name, showID and Date.
Here is my code, I am unsure what should be my modal in for item in loop
in other words, how do I get the specific fields into my empty dictionary array?
let task = NSURLSession.sharedSession().dataTaskWithURL(url) { (data, response, error) -> Void in
if let urlContent = data
{
do
{
var jsonResult:NSDictionary = try NSJSONSerialization.JSONObjectWithData(urlContent, options: NSJSONReadingOptions.MutableContainers) as! NSDictionary
if let items = jsonResult["items"] as! NSArray?
{
var emptyArrayOfDictionary = [[String : AnyObject]]()
for item in 0...jsonResult.count
{
}
}
The idea would be to create a struct (or a class) which contains the properties you need, created with an initializer from the values in your dictionaries.
Let's say you want to make "Show" objects containing the show name and the show ID.
You could create a struct like this:
struct Show {
let name:String
let showID:Int
init?(dictionary: [String:AnyObject]) {
guard let name = dictionary["name"] as? String,
let showID = dictionary["showID"] as? Int else {
return nil
}
self.name = name
self.showID = showID
}
}
Then iterate over your dictionaries and pass each one to the struct initializer, something like this:
let task = NSURLSession.sharedSession().dataTaskWithURL(url) { (data, response, error) -> Void in
if let urlContent = data {
do {
if let jsonResult = try NSJSONSerialization.JSONObjectWithData(urlContent, options: []) as? [String : AnyObject] {
if let items = jsonResult["items"] as? [[String : AnyObject]] {
let shows = items.flatMap { Show(dictionary: $0) }
}
}
} catch {
print(error)
}
}
}
The struct initializer is an Optional one, meaning that if the dictionary does not contain the keys "name" or "showID" it will not create the object and will return nil instead; that's why we're using flatMap to iterate instead of map (because flatMap unwraps the Optionals).
Now you have an array of objects, shows, and you can filter or sort its contents easily with Swift methods like sort, filter, etc.
Each object in the shows array is a Show object and has name and showID properties with the data of your dictionaries.
What flatMap does is create an array of Show objects by iterating (like a loop) over the initial array. On this line:
let shows = items.flatMap { Show(dictionary: $0) }
the $0 represents the current array element. What it means is that for each element in the items array, we take it and create a new Show instance with it, and put the resulting array of objects in the constant shows.
There's also map which is often used, but here the init of our Show struct is an optional init, so it returns an Optional Show, and flatMap knows how to deal with this (it will safely unwrap the optional and ignore the nil ones) where map does not.
If you would like to simplify your son parsing try this Open source https://github.com/SwiftyJSON/SwiftyJSON
With this you access name field of item 0
let userName = json[0]["name"].string
[
{
"cont": 9714494770,
"id": "1",
"name": "Kakkad"
},
{
"cont": 9714494770,
"id": "2",
"name": "Ashish"
}
]
The one above is a json array filled with JSON objects. I don't know how to parse through this with SwiftyJSON
Example from the SwiftyJSON page, adapted to your data:
let json = JSON(data: dataFromNetworking)
for (index, object) in json {
let name = object["name"].stringValue
println(name)
}
Assuming [{"id":"1", "name":"Kakkad", "cont":"9714494770"},{"id":"2", "name":"Ashish", "cont":"9714494770"}] is assigned to a property named jsonData.
let sampleJSON = JSON(data: jsonData)
let sampleArray = sampleJSON.array sampleArray is an optional array of JSON objects.
let firstDict = sampleArray[0] firstDict is an optional JSON dict.
let name = firstDict["name"] is an optional JSON object
let virtName = name.string is a optional string (In this case "Kakkad").
let realName = name.stringValue realName is a string or an empty string.
You could also use:
let longName = sampleJSON[0]["name"].stringValue
After you initialize the JSON object with data all of the elements are JSON types until you convert them to a swift type.
.string optional (string or null)
.stringValue string or "" empty
string
.dict optional ([String: AnyObject] or null)
.dictValue
([String: AnyObject] or String: AnyObject)
For Swift4 I have updated the code from Moritz answer
if let path : String = Bundle.main.path(forResource: "tiles", ofType: "json") {
if let data = NSData(contentsOfFile: path) {
let optData = try? JSON(data: data as Data)
guard let json = optData else {
return
}
//If it is a JSON array of objects
for (_, object) in json {
let name = object["name"].stringValue
print(name)
}
}
}
Swift 3 or 4 code like this:
let json = JSON(yourData)
for (_, object) in json {
let cont = object["cont"].stringValue
print(cont)
}
You can put index instead of _ if you use is anywhere in your code. If you don't use a variable, it's better to put _ (XCode also gives warnings).