New background task modes

CapCollector/Extensions/DispatchGroup+Extensions.swift

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+//
+//  DispatchGroup+Extensions.swift
+//  CapCollector
+//
+//  Created by iMac on 13.01.21.
+//  Copyright © 2021 CH. All rights reserved.
+//
+
+import Foundation
+
+extension DispatchGroup {
+    
+    typealias AsyncSuccessCallback = (Bool) -> Void
+    
+    static func singleTask(timeout: TimeInterval = 30, _ block: (@escaping AsyncSuccessCallback) -> Void) -> Bool {
+        let group = DispatchGroup()
+        group.enter()
+        var result = true
+        block { success in
+            result = success
+            group.leave()
+        }
+        guard group.wait(timeout: .now() + timeout) == .success else {
+            return false
+        }
+        return result
+    }
+}