> On Jun 6, 2015, at 2:43 AM, Roland King <[email protected]> wrote:
>
>
>
> public class RDKBLEService : NSObject
> {
> let peripheral : CBPeripheral
>
> public init( peripheral: CBPeripheral )
> {
> self.peripheral = peripheral
> }
> }
>
> It’s a designated initialiser, there’s a superclass (NSObject) but the
> initialiser doesn’t call a designated initialiser of the superclass.
> According to the rules I was just re-re-re-reading about Swift
> initialisation, it’s required to call a superclass designated initialiser
> from your derived class. I was looking to see if I could find an exception to
> the rule which this fell under but can’t.
There is an exception in the designated initializer rule: if your superclass is
NSObject then you may omit the call to -[NSObject init]. The compiler knows
that -[NSObject init] does nothing, so it allows this as a performance
optimization.
NSObject Class Reference:
"The init method defined in the NSObject class does no initialization; it
simply returns self."
There is lots of existing code that would break if we changed that, so we can't
even if we wanted to.
--
Greg Parker [email protected] Runtime Wrangler
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