Logical fault in repeat-while loop? - swift

Question

I have a problem with the repeat-while loop.I dont know why it doesnt work at my code.Maybe i have some logical fault.
func getJson(){
repeat{
movieName.isHidden = true
let randomNumber = Int(arc4random_uniform(128188))
let jsonUrlString = "https://api.url/3/movie/" + String(randomNumber) + "?api_key="
//let jsonUrlString = "https://api.url.org/3/movie/564?api_key=key&language=de-DE"
guard let url = URL(string: jsonUrlString) else
{return}
URLSession.shared.dataTask(with: url) { (data, response, err) in
guard let data = data else {return}
let dataString = String(data: data, encoding: .utf8)
print(dataString ?? String())
strTrue = false
Here I'm checking if the api returns some data if not they will give me a status code 34.Im checking for the word "status code".
If the api returns "status_code". I'm checking it with a if and then I turn string-code to true.So the condition of the repeat-while loop is
then string-code is true he will start it again and looking for a new movie id.But I tested it and it doesn't work. Maybe you guys can help me :)
let stringCode = dataString?.contains("status_code")
if stringCode == true {
print("yes fehler 34")
strTrue = stringCode!
print(strTrue)
}
do {
guard let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] else {return}
let movie = Movie(json: json)
print(movie.name)
print(movie.genres)
let imageString = "https://image.url.org/t/p/w500"+(movie.imageUrl)
let url2 = URL(string: imageString)
//self.movieImage.downloadedFrom(url: url2!)
self.movieDescriptionLabel = movie.overview
self.movieNameLabel = movie.name
DispatchQueue.main.async {
self.movieName.isHidden = false
self.movieName.text = self.movieNameLabel
self.movieDescription.text = self.movieDescriptionLabel
self.movieImage.downloadedFrom(url: url2!)
}
} catch let jsonError {
print("Error",jsonError)
self.getJson()
}
}.resume()
}while(strTrue == true)