[swift-users] Possible swift 3 method rewrite issue with NSRequestConcreteImplementation ?

[Tony Parker]

Probably, but there could be a compiler bug or importer bug lurking here.

- Tony

> On Jul 18, 2016, at 5:29 PM, Jacob Bandes-Storch <jtbandes at gmail.com> wrote:
> 
> Shouldn't that be implicit, since the function is `override`?
> 
> On Mon, Jul 18, 2016 at 5:25 PM, Tony Parker via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
> Hi John,
> 
> Can you try this?
> 
> @objc(encodeInt:forKey:)
> override func encode(_ intv: Int, forKey key: String) {
>             print("\(key) \(intv)") // never called
> }
> 
> - Tony
> 
> > On Jul 18, 2016, at 12:11 AM, John Spurlock via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
> >
> > Minimal repro case below.  I'm creating a custom NSCoder, but the "encodeInt:forKey" call is not dispatched properly to my overridden method when encoding an NSCalendar instance.
> >
> > What am I missing here?  Without source code for any of this, I'm at a dead end.
> >
> > Thanks,
> > - john
> >
> > ================================================
> >
> >     private class FooCoder : NSCoder {
> >         override var allowsKeyedCoding : Bool { return true }
> >
> >         override func encode(_ objv: AnyObject?, forKey key: String) {
> >             print("\(key) \(objv)") // called
> >         }
> >
> >         override func encode(_ intv: Int, forKey key: String) {
> >             print("\(key) \(intv)") // never called
> >         }
> >     }
> >
> >     func testCoder() {
> >         Calendar.current.encode(with: FooCoder())  // crashes at runtime, result below
> >     }
> >
> > Results in:
> >
> > "NSInvalidArgumentException", "*** -encodeInt:forKey: only defined for abstract class.  Define -[_TtCC22Tests22TestsP33_1961FooCoder encodeInt:forKey:]!"
> > (
> >       0   CoreFoundation                      0x00007fff84da34f2 __exceptionPreprocess + 178
> >       1   libobjc.A.dylib                     0x00007fff883caf7e objc_exception_throw + 48
> >       2   CoreFoundation                      0x00007fff84e0a4bd +[NSException raise:format:] + 205
> >       3   Foundation                          0x00007fff903ccdbd NSRequestConcreteImplementation + 229
> >       4   Foundation                          0x00007fff9035323b -[NSCalendar(NSCalendar) encodeWithCoder:] + 251
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> 
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