CODEWITHSUNDEEP
iosuitableviewsortingswifty-json
swifty
swifty

Reputation: 181

how to sort JSON string alphabetically in swift?

I am using SwiftyJSON to parse the JSON from web, and then displaying those values in a tableView. I want to add a functionality to sort the data alphabetically ascending or descending according to the user names. I am new to Swift and having trouble sorting this. I would appreciate any help! 

override func viewDidLoad(){
super.viewDidLoad()
getContactListJSON()
}

func getContactListJSON(){
let urlString = "http://jsonplaceholder.typicode.com/users"
let urlEncodedString = urlString.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)
let url = NSURL( string: urlEncodedString!)
var task = NSURLSession.sharedSession().dataTaskWithURL(url!) {(data, response, innerError) in
self.json = JSON(data: data)
self.contactsArray = json.arrayValue

dispatch_async(dispatch_get_main_queue(), {

}
 task.resume()
}

This is how I am populating my tableView.

 override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    var cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as? UITableViewCell

    if cell == nil {
        cell = UITableViewCell(style: UITableViewCellStyle.Value2, reuseIdentifier: "Cell")
    }

    cell!.textLabel?.text = self.contactsArray[indexPath.row]["name"].stringValue
    cell!.detailTextLabel?.text = self.contactsArray[indexPath.row]["email"].stringValue
   return cell!

}

Upvotes: 2

Views: 5211

Answers (2)

Dare
Dare

Reputation: 2587

After playing around a bit I found a more swift-friendly answer. I will leave the Objective-C style below as reference in case it's interesting. Of note – in this first example, the array being sorted must be mutable (var not let) for sort() to work. In the second example with Obj-C sort descriptors a new array is created and the original isn't mutated - similar to sorted()

    let contact1: [String: String] = ["name" : "Dare", "email" : "[email protected]"]
    let contact2: [String: String] = ["name" : "Jack", "email" : "[email protected]"]
    let contact3: [String: String] = ["name" : "Adam", "email" : "[email protected]"]

    var contacts = [contact1, contact2, contact3]

    contacts.sort({$0["name"] <  $1["name"]})

    println(contacts)

This is corrupted a bit by Objective-C but seems to work. The major benefit of this method over the other is that this is case-insensitive. Although I am sure there is a better way to do the same thing with newer syntax.

    let contact1: [String: String] = ["name" : "Dare", "email" : "[email protected]"]
    let contact2: [String: String] = ["name" : "Jack", "email" : "[email protected]"]
    let contact3: [String: String] = ["name" : "Adam", "email" : "[email protected]"]

    let contacts: Array = [contact1, contact2, contact3]

    let nameDiscriptor = NSSortDescriptor(key: "name", ascending: true, selector: Selector("caseInsensitiveCompare:"))

    let sorted = (contacts as NSArray).sortedArrayUsingDescriptors([nameDiscriptor])

    println(sorted)

//These print the following 

    [
        {
            email = "[email protected]";
            name = Adam;
        },
        {
            email = "[email protected]";
            name = Dare;
        },
        {
            email = "[email protected]";
            name = Jack;
        }
    ]

Upvotes: 0

saurabh
saurabh

Reputation: 6775

You can sort a Swift Array by using array.sort

self.contactsArray.sort { $0 < $1 }

You can refer this for details.

Upvotes: 3

Related Questions