how to override objective-c method in swift

Question

I am trying to override this objective-c method in a swift subclass. I keep getting compiler errors though:

From AWSMTLModel

- (instancetype)initWithDictionary:(NSDictionary *)dictionary error:(NSError **)error

Swift subclass

override func init!(dictionary dictionaryValue: [NSObject : AnyObject]!)//error: overriding declaration requires override keyword (fix it places override after func but gives same error

score 3 · Accepted Answer · answered Sep 08 '15 at 19:50

3

Drop the func.

override init?(withDictionary dict: [NSObject : AnyObject])

Also, I would get rid of the implicitly unwrapped optionals. If the init can fail, make it an optional. If the dictionary parameter is optional, create another convenience init that takes no parameters, but which creates a default dictionary and calls this init.

answered Sep 08 '15 at 19:50

Mr Beardsley

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I agree, `?` is better then `!`. – Luca Angeletti Sep 08 '15 at 19:53
Do you know where in the Swift book that it describes needing to drop func? – joels Sep 08 '15 at 20:05
There is a whole section on initialization. https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Initialization.html#//apple_ref/doc/uid/TP40014097-CH18-ID203 – Mr Beardsley Sep 08 '15 at 20:05

how to override objective-c method in swift

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