[swift-users] Encoding an array of tuples with a NSCoder

[Philippe Hausler]

NSCoding has never worked with either tuples or classes correctly (primarily because it is not really designed to do so). I would suggest to encode and decode either as an array of array of strings and convert or perhaps encode/decode as an array of classes representing the meaning of the tuple.

> On Sep 22, 2016, at 2:07 PM, Saagar Jha via swift-users <swift-users at swift.org> wrote:
> 
> Hello,
> 
> I’ve been working on migrating some old code over to Swift 3, and I’m having some trouble archiving an array of tuples:
> 
> class Foo: NSObject, NSCoding {
> 	var bar: [(string1: String, string2: String)]
> 
> 	required init?(coder aDecoder: NSCoder) {
> 		bar = aDecoder.decodeObject(forKey: “bar”) as? [(string1: String, string2: String)] ?? []
> 	}
> 
> 	func encode(with aCoder: NSCoder) {
> 		aCoder.encode(bar, forKey: “bar”) // crash
> 	}
> }
> 
> Unfortunately, this code doesn’t seem to work anymore. Is there any way to get a array of tuple encoded without resorting to creating a struct or class in its place?
> 
> Thanks,
> Saagar Jha
> 
> 
> 
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