I have A Array List
private var deviceArray: [SearchPeripheral]? = []
I want to hold data of device array in UserDefaults but its crashing when I store it.
please help me on it
Thank you.
You can't store custom models in UserDefaults. You can make the following improvements to save your objects as [[String:Any]]
struct SearchPeripheral: Codable {
let name: String
let model: String
}
extension SearchPeripheral {
var dictionary: [String:Any] {
let data = try! JSONEncoder().encode(self)
let any = try! JSONSerialization.jsonObject(with: data)
return any as! [String:Any]
}
init?(_ dict: [String:Any]) {
guard let peripheral = (try? JSONSerialization.data(withJSONObject: dict)).flatMap({
try? JSONDecoder().decode(SearchPeripheral.self, from: $0)
}) else {
return nil
}
self = peripheral
}
}
Saving Array of SearchPeripheral:
func save(_ peripherals: [SearchPeripheral]) {
let allPeripherals = peripherals.compactMap({$0.dictionary})
UserDefaults.standard.set(allPeripherals, forKey: "peripherals")
}
Getting Array of SearchPeripherals:
func getPeripherals() -> [SearchPeripheral] {
let allPeripherals = UserDefaults.standard.array(forKey: "peripherals") as? [[String:Any]] ?? []
let peripherals = allPeripherals.compactMap(SearchPeripheral.init)
return peripherals
}
Related
Can Anyone Help me with this
my data after parsing a JSON URL is
{
AREA = (
{
"area_name" = "Bhaktamadhu Nagar";
"city_id" = 4;
id = 31;
price = "100.00";
},
{
"area_name" = "Gandamunda";
"city_id" = 4;
id = 32;
price = "100.00";
}
);
}
and there is a lot more.
I want to fetch only area_name and price values in an array
my code is something like that
do {
let parsedData = try JSONSerialization.jsonObject(with: data!, options: .mutableLeaves) as! NSDictionary
print(parsedData)}
I am getting my Upper format in the parsedData
What is the exact code for getting my area_name and price which should store in two separate arrays as aname[] and price[]
Please don't mark it as a duplicate already searched a lot before posting this.
Your JSON data is converted into [String: AnyObject].
AREA data is [[String: AnyObject]] so create a [String: AnyObject] array. and getting a one by one value from array.
How to fetch JSON data from a url using URLSession?
try this code. it's helpfull
URLSession.shared.dataTask(with: url) { (data, response, error) in
if let jsonData = data {
do {
let parsedData = try JSONSerialization.jsonObject(with: jsonData, options: .mutableLeaves) as! [String: AnyObject]
if let area = parsedData["AREA"] as? [[String: AnyObject]] {
for a in area {
areaNameArr.append(a["area_name"])
priceArr.append(a["price"])
print(a)
}
}
}
catch let error {
debugPrint(error)
}
}
else {
debugPrint(error as Any)
}
}.resume()
Use the SwiftyJSON Lib.
It’s easy and fast.
I am using it and it’s very helpful in this way:
let session = URLSession(configuration: URLSessionConfiguration.ephemeral)
self.Task = session.dataTask(with: RequestLink as URLRequest , completionHandler: { (data,response,error) in
if error != nil {
print(error as Any)
}
let ReadJson4Rest = JSON(data: data!)
if let Rest_Details = ReadJson4Rest["Result"].array{
for Details in Rest_Details {
let Comment = Details.dictionaryValue["Comment"]!
let UserName = Details.dictionaryValue["User_ID"]!
if Comment != nil {
let FirstChar = UserName.description.characters.first
self.GetUserImage(UserName: UserName.string! ,AlphabetCat: (FirstChar?.description)!)
DispatchQueue.main.async {
self.CommentValue.append(Comment.string!)
self.UserNames.append(UserName.string!)
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "Load"), object: nil)
}
}
}
}
})
self.Task?.resume()
}
I have created a mini translation from English words to Spanish words. I would like to use the englishArray.plist instead of my englishArray = ["the cat"] How can I create this?
I have also used a localizable.strings to retrieve the value "the cat" for "el gato" but I would like to retrieve this from englishArray.plist
I started off with this but not sure if I'm on the right path
let path = NSBundle.mainBundle().pathForResource("englishArray", ofType: "plist")
let plistEnglishArray = NSArray(contentsOfFile: path!)
Here is the rest of my code:
var englishArray: [String] = ["rainbow", "boots", "heart", "leaf", "umbrella", "tired", "angry", "cry", "the cat" ]
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.translateTextField.delegate = self
picker.delegate = self
picker.dataSource = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func translateButtonTapped(sender: UIButton) {
let emptyString = self.translateTextField.text
if (emptyString!.isEmpty) {
print("please enter a word")
}
for transIndex in englishArray.indices {
if englishArray[transIndex] == emptyString!.lowercaseString {
//englishArray
//translateLabel.text = "\(spanishArray[transIndex])"
translateLabel.text = NSLocalizedString(emptyString!.lowercaseString, comment:"")
print(emptyString)
return
}
}
}
Swift 4
The absolute simplest way to do this is
let url = Bundle.main.url(forResource: "Sounds", withExtension: "plist")!
let soundsData = try! Data(contentsOf: url)
let myPlist = try! PropertyListSerialization.propertyList(from: soundsData, options: [], format: nil)
The object myPlist is an Array or Dictionary, whichever you used as the base of your plist.
Change your root object to Array, then
var myEnglishArray: [String] = []
if let URL = NSBundle.mainBundle().URLForResource("englishArray", withExtension: "plist") {
if let englishFromPlist = NSArray(contentsOfURL: URL) as? [String] {
myEnglishArray = englishFromPlist
}
}
Swift 4
You can use Codable which is pure swift type.
Firstly load Plist file from bundle then use PropertyListDecoder
Complete code -
func setData() {
// location of plist file
if let settingsURL = Bundle.main.path(forResource: "JsonPlist", ofType: "plist") {
do {
var settings: MySettings?
let data = try Data(contentsOf: URL(fileURLWithPath: settingsURL))
let decoder = PropertyListDecoder()
settings = try decoder.decode(MySettings.self, from: data)
print("array is \(settings?.englishArray ?? [""])")//prints array is ["Good morning", "Good afternoon"]
} catch {
print(error)
}
}
}
}
struct MySettings: Codable {
var englishArray: [String]?
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
englishArray = try values.decodeIfPresent([String].self, forKey: .englishArray)
}
}
This will read a resource in your bundle with the name "englishArray.plist" and store it in the immutable variable english. It will be an Optional that you should test before using.
It uses a closure to read the file and return the array, this lets you use a immutable value rather than a mutable variable that can be changed. It's a good idea to use immutables wherever you can - they promote stability.
import Foundation
let english:[String]? = {
guard let URL = NSBundle
.mainBundle()
.URLForResource("englishArray", withExtension: "plist") else {
return nil
}
return NSArray(contentsOfURL: URL) as? [String]
}()
Here is the solution for swift 3. For this solution you do not need to change types in your plist structure (keep Dictionary, Array, as is). Also note that since your array's name in plist is also englishArray so the (value for key) argument in the second if statement is also englishArray.
var myEnglishArray: [String] = []
if let URL = Bundle.main.url(forResource: "englishArray", withExtension: "plist") {
guard let englishFromPlist = NSDictionary(contentsOf: URL) else { return [] }
if let englishArray = englishFromPlist.value(forKey: "englishArray") as? [String] {
for myEnglish in englishArray {
myEnglishArray.append(myEnglish)
}
}
}
[{"name":"Air Elemental","toughness":"4","printings":["LEA","BTD","7ED","8ED","9ED","10E","DD2","M10","DPA","ME4","DD3_JVC"]}]
I have a JSON where there is an array in each listing called "printings" as seen below, how would I take this array out of each listing and convert it into a string like "LEA-BTD-7ED". Here is what I have so far but its crashing.
let err : NSErrorPointer?
let dataPath = NSBundle.mainBundle().pathForResource("cardata", ofType: "json")
let data : NSData = try! NSData(contentsOfFile: dataPath! as String, options: NSDataReadingOptions.DataReadingMapped)
do{
var contents = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.AllowFragments) as! [AnyObject]
for var i = 0;i<contents.count;++i{
let printing = contents[i]["printings"] as! String
}
}
Here's the code:
let path = dataPath!
if let JSONData = NSData(contentsOfFile: path)
{
do
{
if let dictionariesArray = try NSJSONSerialization.JSONObjectWithData(JSONData, options: NSJSONReadingOptions()) as?
[[String: AnyObject]]
{
for dictionary in dictionariesArray
{
if let printingsArray = dictionary["printings"] as? [String]
{
let printingsString = printingsArray.joinWithSeparator("-")
print(printingsString)
}
}
}
}
catch
{
print("Could not parse file at \(path)")
}
}
Executing it prints "LEA-BTD-7ED-8ED-9ED-10E-DD2-M10-DPA-ME4-DD3_JVC"
You can't cast an Array (contents[i]["printings"]) to a String. What you want is Array's joinWithSeparator() method, like this:
let printing = contents[i]["printing"] as! Array
let printingStr = printing.joinWithSeparator("-")
(Actually, I'm not sure whether you need the as! Array; try it without it.)
i need to save with NSUserDefaults an array that i get from jSON, the problem is it save only the first string and not all the array. So if the array is like NewYork,London,Rome .. it save only NewYork. I use it for a picker view.
This is the code:
EDIT
For save the Array from jSON:
if let jsonData = NSJSONSerialization.JSONObjectWithData(urlData!, options: nil, error: &error) as? [String:AnyObject] { // dictionary
if let locationsArray = jsonData["locations"] as? [[String:AnyObject]] { // array of dictionaries
for locationDictionary in locationsArray { // we loop in the array of dictionaries
if let location = locationDictionary["location_name"] as? String { // finally, access the dictionary like you were trying to do
// println(location)
var locationSave: Void = save.setObject(location, forKey: "Location")
}
}
}
}
}
and for request the Array:
var Location = save.objectForKey("Location")!
var pickerviewFields = Location
return pickerviewFields.count
Thanks in advance!
You can only save an NSArray, if the Array is a Swift Array, you will need to convert it. Also, NSArray and NSDictionary objects, their contents must be property list objects.
Here's how you would convert the Array:
var MyArray = ["a", "b", "c"]
var MyNSArray: NSArray
MyNSArray = MyArray as NSArray
println("\(MyNSArray)")
Prints: (a,b,c)
I have a small example with some sample JSON:
var myJSONString: NSString = "{ \"locations\" : [ { \"location_name\" : \"A\" }, { \"location_name\" : \"B\" }, { \"location_name\" : \"C\" }, { \"location_name\" : \"D\" } ] }"
var urlData: NSData? = NSData()
var error: NSError?
var save = NSUserDefaults.standardUserDefaults()
urlData = myJSONString.dataUsingEncoding(NSUTF8StringEncoding)
if let jsonData = NSJSONSerialization.JSONObjectWithData(urlData!, options: nil, error: &error) as? NSDictionary { // dictionary
if let locationsArray = jsonData["locations"] as? NSArray { // array of dictionaries
for locationDictionary in locationsArray { // we loop in the array of dictionaries
if let location = locationDictionary["location_name"] as? NSString {
println(location)
}
}
NSUserDefaults.standardUserDefaults().setObject(locationsArray, forKey: "locationArray")
}
}
println(save.dictionaryRepresentation())
You can try this:
Writing
let locationArray = ["London", "NewYork", "Rome"]
let locationData = NSKeyedArchiver.archivedDataWithRootObject(locationArray)
NSUserDefaults.standardUserDefaults().setObject(locationData, forKey: "Location")
NSUserDefaults.standardUserDefaults().synchronize()
Reading
let locationData = NSUserDefaults.standardUserDefaults().objectForKey("Location") as? NSData
if let locationData = locationData {
let locationArray = NSKeyedUnarchiver.unarchiveObjectWithData(locationData) as? [String]
if let locationArray = locationArray {
println(locationArray)
}
}
I'm struggling to loop through an array of dictionary values returned from a web service call.
I've implemented the following code and I seem to be encountering a crash on running.
I'd also like to store the results into a custom Struct. Really having difficulty achieving this and the answers on here so far haven't worked. Would be grateful if someone is able to help.
let nudgesURLString = "http://www.whatthefoot.co.uk/NUDGE/nudges.php"
let nudgesURL = NSURL(string: nudgesURLString)
let session = NSURLSession.sharedSession()
let task = session.dataTaskWithURL(nudgesURL!, completionHandler: {data, response, error -> Void in
if error != nil {
println(error)
} else {
let nudgesJSONResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
let nudges: NSDictionary = nudgesJSONResult["nudges"] as NSDictionary
if let list = nudgesJSONResult["nudges"] as? [[String:String]] {
for nudgeDict in list {
let location = nudgeDict["location"]
println(location)
}
}
}
})
task.resume()
}
NOTICE
This answer was written using Swift 1.2 and as such, there may be some slight stylistic and syntax changes required for the answer to work depending on your current Swift system.
Answer -- Swift 1.2
This line is crashing your code:
let nudges: NSDictionary = nudgesJSONResult["nudges"] as NSDictionary
You're forcing a cast that Swift can't handle. You never make it to your for-loop.
Try changing your code to look more like this:
let nudgesURLString = "http://www.whatthefoot.co.uk/NUDGE/nudges.php"
let nudgesURL = NSURL(string: nudgesURLString)
let session = NSURLSession.sharedSession()
let task = session.dataTaskWithURL(nudgesURL!, completionHandler: {data, response, error -> Void in
if error != nil {
println(error)
} else {
let nudgesJSONResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as [String : AnyObject]
if let nudges = nudgesJSONResult["nudges"] as? [[String : String]] {
for nudge in nudges {
let location = nudge["location"]
println("Got location: \(location)")
println("Got full nudge: \(nudge)")
}
}
}
})
task.resume()
Thanks,
I created the following Struct which stored the data, and also lets me create dictionaries in the view controller for a particular index.
struct NudgesLibrary {
var location: NSArray?
var message: NSArray?
var priority: NSArray?
var date: NSArray?
var nudges: NSArray?
init(nudgesObject: AnyObject) {
nudges = (nudgesObject["nudges"] as NSArray)
if let nudges = nudgesObject["nudges"] as? NSArray {
location = (nudges.valueForKey("location") as NSArray)
message = (nudges.valueForKey("message") as NSArray)
priority = (nudges.valueForKey("priority") as NSArray)
date = (nudges.valueForKey("date") as NSArray)
}
}
}