Thanks, Quincey.
> That looks like Swift 3 code. The current version of the function is like
> this:
>
>> @nonobjc func decodeObject(of classes: [AnyClass]?, forKey key: String) ->
>> Any?
@nonobjc means this is Swift-specfic then?
The init function I’m using is marked as @objc:
@objc required init(coder decoder: NSCoder)
{
}
> On 20 Dec 2017, at 01:25, Quincey Morris
> <quinceymor...@rivergatesoftware.com> wrote:
>
> so you’d specify [NSArray.self, <something>.self] for the first parameter.
> (Note, it’s a Swift-specific wrapper function, not just a direct API
> translation.)
>
> You’ll have to figure out what type to use for the Ints. If they were
> actually saved compatibly with Obj-C, the Ints will actually be NSNumbers,
> and you’ll need to say “NSNumber.self”. If the Ints are stored opaquely as
> Ints, I guess it would be Int.self. You should be able to figure out the
> right type by trial and error, I’d say.
>
> (Actually, if the array itself was saved opaquely, then you’ll need something
> like [[Int].self], I guess. This is an area subject to automatic bridging, so
> what you get depends on the exact code used to encode the archive.)
let array = decoder.decodeObject(of: [[Int].self], forKey: kArrayKey) as! [Int]
gives an error:
Cannot invoke 'decodeObject' with an argument list of type '(of: [[Int].Type],
forKey: String)’
The code I mentioned in my follow-up email seems to work:
let array = decoder.decodeObject(of: [NSArray.self], forKey: kArrayKey) as!
[Int]
Presumably as! would throw an exception if it’s not an array of Ints, so that
does get checked (and using as? with a failable initializer would presumably be
better).
If I replace [NSArray.self] with [Array.self] I get an error:
Ambiguous reference to member 'decodeObject(of:forKey:)’
I’ve also tried [Array<Int>.self], which gives a different error:
Cannot invoke 'decodeObject' with an argument list of type '(of:
[Array<Int>.Type], forKey: String)’
Jeremy
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