newValue
newValue and oldValue will only be non-nil if .new/.old is passed to observe(). In general, get the most up to date value by accessing it directly on the observed object instead.
Declaration
let newValue: Value?newValue and oldValue will only be non-nil if .new/.old is passed to observe(). In general, get the most up to date value by accessing it directly on the observed object instead.
let newValue: Value?