使用Double的泛型闭包函数时Swift泄漏

Question

我有一个包含generic functions的简单数组。如果在listeners中存储了一些array，我对leaks有一个奇怪的问题。除了generic types之外，Optional Numeric types可以使用Double?而不会有任何问题。如果我使用memory leak，例如我有一个unowned/weak self。此问题仅在我捕获@UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate { var window: UIWindow? var observations = [(Double?) -> Void]() func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { observations.append { [unowned self] (new) in print(self) } return true } } 时出现。有人可以解释为什么会出现这种泄漏以及如何解决这个问题吗？

observations

如果我将[(String?) -> Void]()更改为05-25 14:36:02.745 I/TestRunner(15055): with id: uk.co.foobar.tm.free.debug:id/reset_timer'. 05-25 14:36:02.745 I/TestRunner(15055): at android.support.test.espresso.PerformException$Builder.build(PerformException.java:84) 05-25 14:36:02.745 I/TestRunner(15055): at android.support.test.espresso.base.DefaultFailureHandler.getUserFriendlyError(DefaultFailureHandler.java:81) 05-25 14:36:02.745 I/TestRunner(15055): at android.support.test.espresso.base.DefaultFailureHandler.handle(DefaultFailureHandler.java:52) etc etc 05-25 14:36:02.745 I/TestRunner(15055): at android.support.test.espresso.base.UiControllerImpl.loopUntil(UiControllerImpl.java:472) 05-25 14:36:02.745 I/TestRunner(15055): at android.support.test.espresso.base.UiControllerImpl.loopUntil(UiControllerImpl.java:419) 05-25 14:36:02.745 I/TestRunner(15055): at android.support.test.espresso.base.UiControllerImpl.injectMotionEvent(UiControllerImpl.java:240) 05-25 14:36:02.745 I/TestRunner(15055): at android 05-25 14:36:02.745 I/TestRunner(15055): ----- end exception ----- ，那么就没有问题。