func backgroundFunction(dm: DataManager) -> AnyObject {
...
}
But in some cases I want to return an empty/null value
I thought of these two values:< /p>
>No
But it seems not allowed: the type’AnyObject’ does not conform to the protocol’NilLiteralConvertible’
> 0
but when I test When the AnyObject value is 0, the value is! = 0 I get this error: Binary operator’! =’Can’t be applied to operands of ‘AnyObject’ and ‘nil’
Are there any solutions?
func backgroundFunction(dm: DataManager) -> AnyObject? {
...
return nil
}
I have a very general function that needs to return AnyObject:
func backgroundFunction(dm : DataManager) -> AnyObject {
...
}
But in some cases I want to return an empty/null value
I thought about it These two values:
>No
But it seems not allowed: The type’AnyObject’ does not conform to the protocol’NilLiteralConvertible’
> 0
< p> But when I test whether the AnyObject value is 0, the value is! = 0 I get this error: Binary operator’! =’Can’t be applied to operands of ‘AnyObject’ and ‘nil’
Are there any solutions?
Only optional values can be set to nil or checked to nil. So you must make your return type optional.
func backgroundFunction(dm: DataManager) -> AnyObject? {
...
return nil
}