在Alamofire雨燕2.2

早上好使用completionHandler，在Alamofire雨燕2.2

我想在雨燕2.2採用completionHandler與Alamofire首次，我有點失去。在我的例子中，我試圖做3個API調用（trakt.tv API），但是我沒有正確地做，因爲completionHandler有一些缺失的值。

我的問題是：我該如何告訴我的函數（帶有completionHandler）等到其他2個函數（getOverview和getPicture）被執行？我嘗試在兩個函數中使用另一個completionHandler，但它不起作用。

這是我的功能：

func getMovies(url: String, clientID: String, completion : ([Movie]) ->()) { 

     let headers = ["trakt-api-version":"2", "Content-Type": "application/json", "trakt-api-key": clientID] 

     Alamofire.request(.GET, url, headers: headers).responseJSON { response in 

      if response.result.isSuccess { 
       let movieInfo = JSON(data: response.data!) 

       for result in movieInfo.arrayValue { 

        let slug = result["ids"]["slug"].stringValue 
        let title = result["title"].stringValue 
        let year = result["year"].stringValue 

        // OVERVIEW 
        self.getOverview(slug, clientID: clientID) { response in 
         print("Overview") 
         print(self.overview) 
        } 

        // PICTURE 
        self.getPicture(slug, clientID: clientID) { response in 
         print("Picture") 
         print(self.picture) 
        } 

        let movie = Movie(slug: slug, title: title, year: year, overview: self.overview, picture: self.picture) 

        print("Slug: "+slug) 
        print("Title: "+title) 
        print("Year: "+year) 
        // EMPTY 
        print("Overview: "+self.overview) 
        // EMPTY 
        print("Picture: "+self.picture) 

        self.movies.append(movie) 
       } 
       completion(self.movies) 
      } else { 
       print(response.result.error) 
      } 
     } 
    }

這是我的電話：

getMovies(url, clientID: self.clientID) { response in 
      print(self.movies) 
      self.tableView.reloadData() 
     }

這就是我的getOverview功能：

func getOverview(slug: String, clientID: String, completion : (String) ->()) { 

    let movieURL: String = "https://api.trakt.tv/movies/"+slug+"?extended=full" 

    let headers = ["trakt-api-version":"2", "Content-Type": "application/json", "trakt-api-key": clientID] 

    Alamofire.request(.GET, movieURL, headers: headers).responseJSON { response in 

     if response.result.isSuccess { 
      let movieInfo = JSON(data: response.data!) 
      self.overview = movieInfo["overview"].stringValue 
      completion(self.overview) 
     } else { 
      print(response.result.error) 
     } 
    } 
}

問候

來源

2016-08-01 Jordi Gámez