Swift Convert string into UIIMAGE - ios

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()
}

Answer 1

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()
})