回答編集履歴
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回答を修正した。
test
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@@ -10,20 +10,160 @@
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メインスレッドに戻る前に、データの読み込みが終わったかどう確認してみてください。
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GCPの`DispatchSemaphore`を使えば、上手く行けるはずです。
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以下は、APIコールを待っている処理の事例です。
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```
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import Foundation
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class MyTest {
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func runTheShow() {
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DispatchQueue.global(qos: .utility).async {
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let json: Teratail? = self.fetchQuestion()
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DispatchQueue.main.async {
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print(json)
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}
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}
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}
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func fetchQuestion() -> Teratail? {
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var myresponse: Teratail? = nil
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guard let url = URL(string: "https://teratail.com/api/v1/questions") else {return nil}
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let semaphore = DispatchSemaphore(value: 0)
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let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
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do {
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guard let data = data else {return}
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let json = try JSONDecoder().decode(Teratail.self, from: data)
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myresponse = json
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}
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catch {
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print("error:", error)
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}
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semaphore.signal()
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}
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task.resume()
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_ = semaphore.wait(wallTimeout: .distantFuture)
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return myresponse
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}
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}
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struct Teratail: Decodable {
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let meta: Meta
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let questions: [Question]
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}
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struct Meta: Decodable {
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let hit_num: Int
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let limit: Int
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let message: String
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let page: Int
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let total_page: Int
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}
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struct Question : Decodable {
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let count_clip: Int
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let count_pv : Int
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let count_reply: Int
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let created: String
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let modified: String
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let id: Int
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let is_accepted: Bool
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let is_beginner: Bool
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let is_presentation: Bool
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let tags: [String]
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let title: String
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let user: User
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}
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struct User: Decodable {
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let display_name: String
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let photo: String
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let score: Int
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}
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let obj = MyTest()
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obj.runTheShow()
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169
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```
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