Итак, у меня есть задача запроса, и внутри нее у меня есть цикл с другой задачей запроса. Я хочу выполнить задачу запроса цикла, а затем продолжить выполнение другой.
let dispatchGroup = DispatchGroup()
override func viewDidLoad() {
super.viewDidLoad()
tableView.reloadData()
fetchData()
dispatchGroup.notify(queue: .main) {
self.tableView.reloadData()
}
}
func fetchData() {
var movies: String?
dispatchGroup.enter()
print("Enter fetchData")
let task = session.dataTask(with: url) { data, response, error in
if error != nil || data == nil {
print("Client error!")
return
}
guard let response = response as? HTTPURLResponse, (200...299).contains(response.statusCode) else {
print("Server error!")
return
}
guard let mime = response.mimeType, mime == "application/json" else {
print("Wrong MIME type!")
return
}
do {
let json = try JSONSerialization.jsonObject(with: data!, options: []) as? [String : Any]
if let result = json?["results"] as? Array<Dictionary<String, Any>> {
for results in result {
self.char = StarWarsData.init(name: results["name"] as! String, height: results["height"] as! String, mass: results["mass"] as! String, gender: results["gender"] as! String, birthyear: results["birth_year"] as! String, film: results["films"] as! [String])
let name = self.char.name
let height = self.char.height
let mass = self.char.mass
let gender = self.char.gender
let birthyear = self.char.birthyear
let charFilms = self.char.film
for theFilms in charFilms {
self.fetchFilms(films: theFilms) { (filmNames) in
movies = filmNames
print(movies!)
}
}
let item = StarWarsData(name: name, height: height, mass: mass, gender: gender, birthyear: birthyear, film: charFilms)
self.dataArray.append(item)
self.dataNames.append(name)
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
}
}catch {
print("JSON error: \(error.localizedDescription)")
}
print("Leaving fetchData")
self.dispatchGroup.leave()
}
task.resume()
}
func fetchFilms(films: String, taskCallBack: @escaping (String) -> ()) {
let url = URL(string: films)!
var filmsArr: [String] = []
var item: String!
var joinItem: String!
dispatchGroup.enter()
print("Enter fetchFilms")
let task = self.session.dataTask(with: url, completionHandler: { (data, response, error) -> Void in
if error != nil || data == nil {
print("Client error!")
return
}
guard let response = response as? HTTPURLResponse, (200...299).contains(response.statusCode) else {
print("Server error!")
return
}
guard let mime = response.mimeType, mime == "application/json" else {
print("Wrong MIME type!")
return
}
do {
let json = try JSONSerialization.jsonObject(with: data!, options: []) as? [String : Any]
if let results = json?["title"] as? String {
for results in results {
item = String(results)
filmsArr.append(item)
}
joinItem = filmsArr.joined(separator: "")
taskCallBack(joinItem)
}
}catch {
print("JSON error: \(error.localizedDescription)")
}
print("Leaving fetchFilms")
self.dispatchGroup.leave()
})
task.resume()
}
Так что проверьте операторы печати, и вы поймете, что я хочу. Это мой вывод.
Enter fetchData
Enter fetchFilms
Enter fetchFilms
Enter fetchFilms
Enter fetchFilms
Enter fetchFilms
Enter fetchFilms
Enter fetchFilms
Enter fetchFilms
Enter fetchFilms
Enter fetchFilms
Leaving fetchData
A New Hope
Leaving fetchFilms
The Empire Strikes Back
Leaving fetchFilms
Return of the Jedi
Leaving fetchFilms
The Force Awakens
Leaving fetchFilms
Revenge of the Sith
Leaving fetchFilms
The Empire Strikes Back
Leaving fetchFilms
The Phantom Menace
Leaving fetchFilms
Attack of the Clones
Leaving fetchFilms
Revenge of the Sith
Leaving fetchFilms
The Phantom Menace
Leaving fetchFilms
Notify table reloaded
Просто я хочу это:
Enter fetchData
Enter fetchFilms
Enter fetchFilms
Enter fetchFilms
Enter fetchFilms
Enter fetchFilms
Enter fetchFilms
Enter fetchFilms
Enter fetchFilms
Enter fetchFilms
Enter fetchFilms
A New Hope
Leaving fetchFilms
The Empire Strikes Back
Leaving fetchFilms
Return of the Jedi
Leaving fetchFilms
The Force Awakens
Leaving fetchFilms
Revenge of the Sith
Leaving fetchFilms
The Empire Strikes Back
Leaving fetchFilms
The Phantom Menace
Leaving fetchFilms
Attack of the Clones
Leaving fetchFilms
Revenge of the Sith
Leaving fetchFilms
The Phantom Menace
Leaving fetchFilms
Leaving fetchData
Notify table reloaded
Я хочу как-то приостановить задачу перед оператором печати Leaving fetchData и завершить весь процесс func fetchFilms и затем продолжить с оператором печати Leaving fetchData. На самом деле func fetchData() завершается до окончания func fetchFilms, и я не беру фильмы, которые хочу. Кстати, заявление print(movies!) дает мне фильмы, но уже слишком поздно.