My double-closure function is not working - swift

Question

I have two async function which send requests to my server.
DispatchQueue.global(qos: .userInitiated).async {
weak var weakself = self
self.unregisterPushServer(token: token!) { [weak self] success in
print("0")
if success {
print("1")
weakself?.unregisterPushInfoKeychain(token: token!)
print("2")
if let this = self {
print("PLEASE")
weakself?.registerPushServer(token: token!) { [weak this] success in
print("3")
if success {
print("4")
this?.registerPushInfoKeychain()
print("5")
}
}
}
print("success")
}
}
}
And the functions are
private func registerPushServer(token: String, completion: #escaping (Bool) -> ()) {
request() { (data, error) in
if data != nil {
completion(true)
} else {
completion(false)
}
}
private func unregisterPushServer(token: String, completion: #escaping (Bool) -> ()) {
request2() { (data, error) in
if data != nil {
completion(true)
} else {
completion(false)
}
}
But in console,
0
1
2
success
not seemed to executes codes after my PLEASE sign.
Why is my code is not working?
I first thought that the problem was about the queue, but it was not.

Answer 1

You don't need this line:
weak var weakself = self
By including [weak self] in the closure's capture list, self automatically becomes weak.
Try and replace the instances of weakself with just self.
I'm also thinking you may not even need the if let this = self condition.
I hope this helps.

Answer 2

OK, the problem was not in this code.
When I call this function, I did it like this.
func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String) {
print("Firebase registration token: \(fcmToken)")
let pushService = PushService()
pushService.updateRegistrationStatus(token: fcmToken)
}
the
pushService.updateRegistrationStatus(token: fcmToken)
was the function which contains the code I asked above.
In this situation, the function updateRegistrationStatus is not guaranteed because pushService itself is released by ARC when messaging(...) function block is end.
class AppDelegate: UIResponder, UIApplicationDelegate {
let pushService = PushService()
...
func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String) {
print("Firebase registration token: \(fcmToken)")
self.pushService.updateRegistrationStatus(token: fcmToken)
}
}
Now the pushService object is not released because it is declared as a global variable.