Ensure Examples' finish is called only once. (#158)

mapbox · Mar 5, 2021 · 1ab38db · 1ab38db
1 parent f02328e
commit 1ab38db
Showing 1 changed file with 11 additions and 4 deletions.
diff --git a/Examples/Examples/Models/Examples.swift b/Examples/Examples/Models/Examples.swift
@@ -15,6 +15,16 @@ public protocol ExampleProtocol {
     func finish()
 }
 
+private struct ExampleProtocolFinish {
+    static var postNotification: Void = {
+        // Lazy initialization to ensure that this is called once only.
+        DispatchQueue.main.asyncAfter(deadline: .now() + 3.0) {
+            let center = CFNotificationCenterGetDarwinNotifyCenter()
+            CFNotificationCenterPostNotification(center, CFNotificationName(Example.finishNotificationName as CFString), nil, nil, true)
+        }
+    }()
+}
+
 extension ExampleProtocol {
     public func resourceOptions() -> ResourceOptions {
         guard let accessToken = AccountManager.shared.accessToken else {
@@ -30,10 +40,7 @@ extension ExampleProtocol {
     }
 
     public func finish() {
-        DispatchQueue.main.asyncAfter(deadline: .now() + 3.0) {
-            let center = CFNotificationCenterGetDarwinNotifyCenter()
-            CFNotificationCenterPostNotification(center, CFNotificationName(Example.finishNotificationName as CFString), nil, nil, true)
-        }
+        _ = ExampleProtocolFinish.postNotification
     }
 }