Refresh JSON data after a few seconds in swift - json

Question

I want this to update every 4 seconds with fresh data form the url, but i dont know how to do this. This is what i have so far and it works fine but without the refresher! The Refresher needs to work like a youtube subscriber counter that update every 4 seconds or so. I have looked at a timer but i couldn't make it work because (i think) its a searchBarSearchButtonClicked function and the urlRequestid has to have a input! Please help! Thanks!
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
let urlRequestid = URLRequest(url: URL(string: "https://www.mylink.com/\(searchBar.text!.replacingOccurrences(of: " ", with: "%20"))/?__a=1")!)
if (interstitial.isReady){
interstitial.present(fromRootViewController: self)
interstitial = createAndLoadInterstitial()
}
let task = URLSession.shared.dataTask(with: urlRequestid) { (data, response, error) in
if error == nil {
do {
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! [String : AnyObject]
if let user = json["user"] as? [String : AnyObject] {
let profile_pic_url_hd = user["profile_pic_url_hd"] as! String
let urlstr = "\(profile_pic_url_hd)"
if var comps = URLComponents(string: urlstr) {
var path = comps.path
var pathComps = path.components(separatedBy: "/")
pathComps.remove(at: 2) // this removes the s320x320
path = pathComps.joined(separator: "/")
comps.path = path
if let newStr = comps.string {
print(newStr)
self.imgURL = "\(newStr)"
}
}
if let bio = user["biography"] as? String {
self.bioS = bio
}
if let naam = user["username"] as? String {
self.naamS = naam
}
if let followed_by = user["followed_by"] as? [String : AnyObject] {
self.VolgS = followed_by["count"] as! Int
}
if let follows = user["follows"] as? [String : AnyObject] {
self.volgD = follows["count"] as! Int
}
if let media = user["media"] as? [String : AnyObject] {
self.postS = media["count"] as! Int
}
}
if let _ = json["error"] {
self.exists = false
}
DispatchQueue.main.async {
if self.exists{
self.imgView.downloadImage(from: self.imgURL!)
self.naam.text = "#\(self.naamS ?? "")"
if self.bioS == nil {
self.bio.text = "This Person has no biography!"
} else {
self.bio.text = "\(self.bioS ?? "")"
}
self.volgers.text = "\(self.VolgS!)"
self.volgend.text = "\(self.volgD!)"
self.post.text = "\(self.postS!)"
} else {
self.exists = true
}
}
} catch let jsonError {
print(jsonError.localizedDescription)
}
}
}
task.resume()
}
}

Answer 1

One quick but admittedly clumsy fix would be to store the latest UISearchBar instance from the searchBarSearchButtonClicked parameter in a local instance variable:
var currentSearch: UISearchBar = UISearchBar()
var timer: Timer?
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
currentSearch = searchBar
// Add the rest of the method code below...
...
}
// Call this method to begin repetition
func repeatSearch() {
self.timer = Timer.scheduledTimer(withTimeInterval: 4.0, repeats: true,
block: { (timer) in
self.searchBarSearchButtonClicked(self.currentSearch)
})
}

Answer 2

You can achieve it by using the Timer, schedule it for every 4 seconds.
DEMO
FOR iOS 10.0 and Above
var timer: Timer?
func callMe() {
func doSomrThing(str: String) {
print(str)
}
doSomrThing(str: "first time")
self.timer = Timer.scheduledTimer(withTimeInterval: 4.0, repeats: true, block: { (timer) in
doSomrThing(str: "after 4 second")
})
}
For below iOS 10.0
var timer: Timer?
func callMe() {
self.doSomeThing(str: "first time")
self.timer = Timer.scheduledTimer(timeInterval: 4.0, target: self, selector: #selector(AddTextVC.timerHandler), userInfo: nil, repeats: true)
}
func doSomeThing(str: String) {
print(str)
}
func timerHandler() {
self.doSomeThing(str: "after 4 seconds")
}
Just replace your code according to the demo.
And add this code to your viewController :
deinit {
self.timer?.invalidate()
self.timer = nil
}