Hi Everybody,
I am trying to implement a function that returns the current UNAuthorizationStatus for use in a View to show a button or not. The function below doesn´t work because the closure is executed after the return - is there any simple way to achieve this?
func getStatus() -> UNAuthorizationStatus {
var result: UNAuthorizationStatus = .notDetermined
UNUserNotificationCenter.current().getNotificationSettings(
completionHandler: { (settings) in
result = settings.authorizationStatus
print("result in closure = \(result.rawValue)")
}
)
print("result at return = \(result.rawValue)")
return result
}Sorry, if this is a bit of a rookie question but I don´t seem to be able to figure this out.
Thanks
Florian
A simple advise, never try to return a value from asynchronous call.
Completion handler pattern is one of the preferred way in UIKit apps:
func getStatus(completion: @escaping (UNAuthorizationStatus)->Void) {
UNUserNotificationCenter.current().getNotificationSettings(
completionHandler: { (settings) in
let result = settings.authorizationStatus
print("result in closure = \(result.rawValue)")
completion(result)
})
}But, if you are using SwiftUI, you should better use some Combine featrures, an example using Future:
func getStatus() -> Future<UNAuthorizationStatus, Never> {
return Future {promise in
UNUserNotificationCenter.current().getNotificationSettings(
completionHandler: { (settings) in
let result = settings.authorizationStatus
print("result in closure = \(result.rawValue)")
promise(.success(result))
})
}
}Anyway, which would best fit for your app depends on how and where your app calls this method. Please show more code how you want to use this method.
