Код в моем классе viewcontroller выполняется до того, как будет готов процесс загрузки JSON, даже если в функции есть обработчик завершения для загрузки JSON и DispatchGroup (). Я храню данные JSON в массиве под названием «fetchedModules», и в данном случае он заполняется 11 элементами. Почему это происходит?
result in console:
---> in Class PostCell - func numberOfSections: 0
JSON call finished
// ViewController
override func viewDidLoad() {
super.viewDidLoad()
let group = DispatchGroup()
group.enter()
self.fetchJSON()
// here calling downloadJSONasync
group.leave()
group.notify(queue: .main) {
print("JSON call finished")
}
...
// networkService with completion
func downloadJSONasync(searchItem: String, completion: @escaping ([NSDictionary]) -> Void) {
//request.cachePolicy = URLRequest.CachePolicy.reloadIgnoringLocalCacheData
request.httpMethod = "GET"
let configuration = URLSessionConfiguration.default
//let session = URLSession(configuration: configuration, delegate: nil)
let session = URLSession(configuration: configuration)
let task = session.dataTask(with: request, completionHandler: {(data, response, error) in
guard let data = data, error == nil else { return }
if (error != nil) {
print("error!")
}
else{
do {
let fetchedData = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments) as! [NSDictionary]
completion(fetchedData)
}
catch {
print("error")
}
}
})
task.resume()
}
// call in viewController
override func numberOfSections(in tableView: UITableView) -> Int {
print("---> in Class PostCell - func numberOfSections: \(String(describing: fetchedModules.count))")
return fetchedModules.count
// code of fetchJSON
func fetchJSON()
{
let baseurl = AppConstants.Domains.baseurl // https://m.myapp2go.de
let compositURL = baseurl + "getmodules_noItems.php?id=\(AppConstants.appString.startString)"
let encodedUrl : String! = compositURL.addingPercentEncoding(withAllowedCharacters: CharacterSet.urlQueryAllowed) // remove the spaces in the url string for safty reason
let JSONurl = URL(string: encodedUrl)! // convert the string into url
var JSONrequest = URLRequest(url: JSONurl) // make request
JSONrequest.httpMethod = "GET"
//JSONrequest.cachePolicy = .reloadIgnoringCacheData
let networkService = NetworkService(request: JSONrequest)
networkService.downloadJSONasync(searchItem: AppConstants.appString.startString, completion: { (fetchedData) in
fetchedModules.removeAll()
DispatchQueue.main.async {
for eachFetchedModul in fetchedData {
let eachModul = eachFetchedModul
if
let custid = eachModul["custid"] as? String,
let modulcat = eachModul["modulcat"] as? String,
let modulname = eachModul["modulname"] as? String,
let comment = eachModul["comment"] as? String
{
fetchedModules.append(CModules(custid: custid, modulcat: modulcat, modulname: modulname, comment: comment))
print(custid)
print(modulcat)
print(modulname)
print(comment)
print("---------------------")
}
}// for end
// ... somehow set data source array for your table view
self.tableView.reloadData()
}// dispatch
}
)} // func end