Fixed the Coercion of implicitly unwrappable value of type 'NSObjectProtocol?' to 'Any' does not unwrap optional warnings.
Since the token field of CoachMarkHandler is marked as non-optional we can safely forcibly unwrap it wherever it's used.
The warning appears in XCode 11 because, as stated in SE-0054, ! is treated differently now in regards to IUO values.
Specifically:...the appearance of ! at the end of a property or variable declaration's type no longer indicates that the declaration has IUO type; rather, it indicates that (1) the declaration has optional type, and (2) the declaration has an attribute indicating that its value may be implicitly forced. ...
Hence even though var token:NSObjectProtocol! is declared with !, XCode will still prefer to bind it to an optional since NotificationCenter.default.removeObserver(...) accept Any value that can be nil. Hence, the annoying warning.
SE-0054: https://github.com/apple/swift-evolution/blob/master/proposals/0054-abolish-iuo.md
Fixed the
Coercion of implicitly unwrappable value of type 'NSObjectProtocol?' to 'Any' does not unwrap optionalwarnings.Since the
tokenfield ofCoachMarkHandleris marked as non-optional we can safely forcibly unwrap it wherever it's used.The warning appears in XCode 11 because, as stated in SE-0054,
!is treated differently now in regards to IUO values.Specifically:
...the appearance of ! at the end of a property or variable declaration's type no longer indicates that the declaration has IUO type; rather, it indicates that (1) the declaration has optional type, and (2) the declaration has an attribute indicating that its value may be implicitly forced. ...Hence even though
var token:NSObjectProtocol!is declared with!, XCode will still prefer to bind it to an optional sinceNotificationCenter.default.removeObserver(...)acceptAnyvalue that can benil. Hence, the annoying warning.