ios - 我可以快速从后台队列调用静态方法吗？

Question

我在 ServerCommunication 类中有一个静态的 getData() 方法，我可以从后台队列调用这个方法吗？

//ServerCommunication.swift

import UIKit
import Foundation


class ServerCommunication
{
      class func getData(url: String, sessionId: String) -> ServerResponse {
            //server communication code goes here
      }
}

func populateData() {
     DispatchQueue.global(qos: .background).async {
           let response = ServerCommunication.getData(url: URL, sessionId: "")
     }
}

任何人都可以解释对线程执行的影响吗？或者我可能需要将 ServerCommunication 类定义为 Singleton？

getData() static class executed multiple times when calling from background queue

#Edit1 更多解释

发生推送通知时，当我尝试打开特定的 viewController 时，会出现此问题。我正在使用名为 FAPanelController 的第三方库分别接受中心、左和右 viewController。

代码示例:

@available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
//Now I want to open a viewController
if let panel = self.window?.rootViewController as? FAPanelController     
{
    let centerNavVC = storyboard.instantiateViewController(withIdentifier: "HomeViewController") as! UINavigationController
        let vc = centerNavVC.topViewController as! HomeViewController
        panel.center(centerNavVC, afterThat: {
            //HomeViewController has a method populateData() in viewWillAppear()
        })
}
}

Answer 1

你可以为此使用闭包

class ServerCommunication
{
    class func getData(url: String, sessionId: String, success: @escaping ((_ responseObject: ServerResponse?) -> Void)) {
        //server communication code goes here
        success(serverData) // serverData is a server response
    }
}

func populateData() {
    ServerCommunication.getData(url: "", sessionId: "", success: { (response) in
       // You can handle response here
       print(response)
    })
}