Swift Convert string into UIIMAGE

Question

I would like to load an image from an api web service asynchronously into a uitableview with swift for iOS 9. Below is the code from my Playlist controller. Thanks in advance.

import UIKit

class PlaylistViewController: UITableViewController {

var playlists = [[String: String]]()

override func viewDidLoad() {
    super.viewDidLoad()

    let urlString = "http://xxxxxxx.xxx/api/v1/players/1/playlists?api_key=xxxxxxxxxxxx"

    if let url = NSURL(string: urlString) {

        if let data = try? NSData(contentsOfURL: url, options: []) {
            let json = JSON(data: data)


            if json != nil {
                parseJSON(json)
            } else {
                showError()
            }
        } else {
            showError()
        }
    } else {
        showError()
    }
}

func showError() {
    let ac = UIAlertController(title: "Loading error", message: "There was a problem loading the feed; please check your connection and try again.", preferredStyle: .Alert)
    ac.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil))
    presentViewController(ac, animated: true, completion: nil)
}

func parseJSON(json: JSON) {
    for result in json["playlists"].arrayValue {
        let title = result["title"].stringValue
        let id = result["id"].stringValue
        let cover_url = result["cover_url"].stringValue
        let obj = ["title": title, "id": id, "cover_url" : cover_url]
        playlists.append(obj)
    }

    tableView.reloadData()
}

NSData(contentsOfURL: url, options: []) it is NOT asynchronously. you should use NSURLSession dataTaskWithURL — Leo Dabus
– Leo Dabus, Commented Oct 18, 2015 at 1:01

t4nhpt · Accepted Answer · 2015-10-18 02:55:59Z

Use NSURLSession dataTaskWithURL for asynchronously task:

override func viewDidLoad() {
    super.viewDidLoad()

    let urlString = "http://xxxxxxx.xxx/api/v1/players/1/playlists?api_key=xxxxxxxxxxxx"

    if let url = NSURL(string: urlString) {

        let session = NSURLSession.sharedSession()
        var task = session.dataTaskWithURL(url) { (data, response, error) -> Void in

            if let err = error {
                showError(err)
            } else {
                let json = NSString(data: data, encoding: NSUTF8StringEncoding)
                // json is a String, you should handle this String as JSON
                parseJSON(json)
            }
    }
}

Your tableView.reloadData() should be executed in main thread (because the NSURLSession dataTaskWithUrl result is in background thread)

dispatch_async(dispatch_get_main_queue(), {
    tableView.reloadData()
})

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