[swift-users] Possible swift 3 method rewrite issue with NSRequestConcreteImplementation ?
anthony.parker at apple.com
Tue Jul 19 18:33:14 CDT 2016
Thanks for filing the bug.
The root cause of the issue is that the importer would turn the following methods into the same name:
- (void)encodeInt:(int)x forKey:(NSString *)k;
- (void)encodeInt32:(uint32_t)x forKey:(NSString *)k;
Plus, there is the added confusion that this method:
- (void)encodeInteger:(NSInteger)x forKey:(NSString *)k;
is imported into Swift like this:
func encode(_ x: Int, forKey k : String)
where, as you can see, “Int” means “NSInteger”, but not the C “int”.
I’m not really sure how to resolve this and still allow for subclassing without simply reverting these names back to Swift 2.2 style, so I think that’s probably what I’ll have to do:
func encodeInt(_ x : Int32, forKey k : String)
func encodeInt32(_ x : Int32, forKey k : String)
func encodeInt64(_ x : Int64, forKey k : String)
func encodeInteger(_ x : Int, forKey k : String)
and so on, for all of the encode methods, so they are consistent.
> On Jul 19, 2016, at 8:20 AM, John Spurlock <john.spurlock at gmail.com> wrote:
> Ok, filed a new bug for the encodeInt:forKey issue: rdar://problem/27425997
> Ensured it reproduces in xcode beta 3, swift version 3.0 (swiftlang-800.0.34.6 clang-800.0.33)
> Is there anything I can do in the meantime as a swift-only workaround to fix my custom NSCoder?
> - john
> On Mon, Jul 18, 2016 at 10:52 PM, Tony Parker <anthony.parker at apple.com <mailto:anthony.parker at apple.com>> wrote:
> We renamed some of these methods for Swift 3 in an attempt to remove some of the confusion surrounding which of these did what - they were really named for C types and not Swift ones.
> encodeInt:forKey: and decodeInt:forKey: are the two missing ones, since they were easily confused with the Swift Int type. I think we’ll have to figure out a different approach here. John, please file a bug at bugreport.apple.com <http://bugreport.apple.com/> and let me know the radar number, and we’ll look into it.
> - Tony
> > On Jul 18, 2016, at 6:33 PM, Brent Royal-Gordon <brent at architechies.com <mailto:brent at architechies.com>> wrote:
> >> Hi Tony - when I add that attribute, I get an error at compile-time:
> >> Objective-C method has a different selector from the method it overrides ('encodeInt:forKey:' vs. 'encodeInteger:forKey:')
> >> If I update to encodeInteger:forKey as the fix describes, it compiles, but I'm getting the same original problem at runtime. i.e. "encodeInt:forKey: only defined for abstract class"
> >> Any other ideas? See the same thing over there? You should be able to paste that into a new swift 3 test.
> > If you look at the NSCoder documentation, you'll see 25 methods in the Swift version of the "Encoding General Data" section, and 27 (non-deprecated) in the Objective-C version. `-encodeInt:forKey:` has no Swift equivalent. I'm not sure what the other missing method is.
> > I think this is probably a bug or design oversight, and I'd recommend you file a radar against Foundation. If this is a primitive method for NSCoding, it needs to be accessible from Swift.
> > --
> > Brent Royal-Gordon
> > Architechies
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