Similar question - if I wrap UserDefaults in the property wrapper (in my example to provide access to shared app group defaults).
@propertyWrapper
public struct HMASettingsDefault<Value> {
let key: String
let defaultValue: Value
var container: UserDefaults = UserDefaults.standard
public var wrappedValue: Value {
get {
return container.object(forKey: key) as? Value ?? defaultValue
}
set {
if let optionalValue = newValue as? AnyOptional, optionalValue.isNil {
container.removeObject(forKey: key)
}
else {
container.set(newValue, forKey: key)
}
}
}
}
Xcode will report
"is not concurrency-safe because it is non-isolated global shared mutable state" in all places where this wrapper is used e.g.
@HMASettingsDefault(key: "fixedAppTimezone", defaultValue: Calendar.current.timeZone.identifier, container: MyAppGroup.defaults)
static var userTimezoneId: String
What would be the best approach to use (promised) threadsafe objects in property wrappers in Swift6 strict concurrency world?
jki
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Can confirm this issue on iOS 17.4 beta.
Submitted as FB7734488, feel free to dupe.