Instance method nearly matches optional Requirement

Question

I have a class in swift which implements SRWebSocketDelegate protocol written in objective-c. When I try to implement it's optional method webSocketDidOpen, then I get the following warning:

Also, when I run my code the implementation for webSocketDidOpen is not getting called and the code directly goes to webSocket(_ webSocket: SRWebSocket, didReceiveMessageWith string: String)

How do I implement the optional methods of my protocol written in Objective-C and also get rid of these warnings?

Thanks in advance!

@robmayoff, Wouldn't that make it as an local instance method instead of implemented method of SRWebSocketDelegate? — Exception, Jul 19 '17 at 15:34
It already isn't the protocol implementation; that's what the warning is telling you. The fixit is trying to make it match the requirement. — Rob Napier, Jul 19 '17 at 15:38

score 3 · Accepted Answer · answered Jul 19 '17 at 15:35

3

SRWebSocket.h is annotated NS_ASSUME_NONNULL_BEGIN, so by default all values are nonnull. That means that this:

- (void)webSocketDidOpen:(SRWebSocket *)webSocket;

Is imported as:

func webSocketDidOpen(_ webSocket: SRWebSocket)

But you implemented:

func webSocketDidOpen(_ webSocket: SRWebSocket!)

SRWebSocket is not the same type as SRWebSocket!. Remove the !. This is likely what the rename fixit will do for you.

answered Jul 19 '17 at 15:35

Rob Napier

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Didn't realise it was such a small issue. Thanks! – Exception Jul 19 '17 at 15:39
1

If Rob solved your problem, please click the check mark next to his answer. – rob mayoff Jul 20 '17 at 02:35

Instance method nearly matches optional Requirement

1 Answers1