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我的代码执行API请求并加载数据。在下一步中，数据将显示为Map上的标记。但现在它的顺序是错误的。我的控制台首先显示"Second line of code executed"，然后显示"The Data has been loaded"。结果是POI不会显示在我的Map上。
下面是我下载和解析数据的方式：

struct hereApi {

static var dataFromHereApi = [Items]()
static var gewählteKategorie = 0

func fetchPoi(geoCordinate: String) {
    
    var selectedCategory = "0"

    selectedCategory = {
        switch hereApi.gewählteKategorie {
        case 0:
            return
            "gym"
        case 1:
            return "school"
        default:
            return "cinema"
        }
    }()
    
    let urlString = "https://..."
    performRequest(urlString: urlString)
}

func performRequest(urlString: String) {
    if let url = URL(string: urlString) {
        let session = URLSession(configuration: .default)
        let task = session.dataTask(with: url) { data, response, error in
            
            if error != nil {
                print(error!)
                return
            }
            if let safeData = data {
                parseJSON(poiData: safeData)
            }
        }
        task.resume()
    }
}

func parseJSON(poiData: Data) {
    let decoder = JSONDecoder()
    do {
        let decodedData = try decoder.decode(POIData.self, from: poiData)
        hereApi.dataFromHereApi = decodedData.items
        
        print("The Data has been loaded.")
        
        
    } catch {
        print(error)
    }
    
}

}
这是我在另一个ViewController中执行请求的方式：

var networkGoogleApiConnect = hereApi()
    
        func loadDataFromApi(arg: Bool, completion: (Bool) -> ()) {
...
            networkGoogleApiConnect.fetchPoi(geoCordinate: fullCordinate)            
            completion(arg)
        }
        
        loadDataFromApi(arg: true, completion: { (success) -> Void in
            print("Second line of code executed")
            if success {
                  print("true")
            } else {
                 print("false")
            }
        })