objective c - Fail to decode Int with NSCoder in Swift -

i using xcode8 beta swift 3.0. tried encode simple object base on nsobject, cannot decode int or nsinteger type. (the encoding process ok)

codes

class model : nsobject, nscoding {     var seq: nsnumber?     var seq2: int? // problem seq2, nsinteger not ok, either     var id: string?     var value: string?      override init() {         super.init()     }      required init?(coder adecoder: nscoder){         self.seq = adecoder.decodeobject(forkey: "seq") as? nsnumber         self.seq2 = adecoder.decodeinteger(forkey: "seq2")         self.id = adecoder.decodeobject(forkey: "id") as? string         self.value = adecoder.decodeobject(forkey: "value") as? string     }      func encode(with acoder: nscoder){         acoder.encode(seq, forkey: "seq")         acoder.encode(seq2, forkey: "seq2")         acoder.encode(id, forkey: "id")         acoder.encode(value, forkey: "value")     } } 

the problem seq2 not int, rather int? optional. cannot represented objective-c integer.

you can use decodeobject:

required init?(coder adecoder: nscoder){     self.seq = adecoder.decodeobject(forkey: "seq") as? nsnumber     self.seq2 = adecoder.decodeobject(forkey: "seq2") as? int     self.id = adecoder.decodeobject(forkey: "id") as? string     self.value = adecoder.decodeobject(forkey: "value") as? string      super.init() } 

or change not optional:

class model : nsobject, nscoding {     var seq: nsnumber?     var seq2: int     var id: string?     var value: string?      init(seq: nsnumber, seq2: int, id: string, value: string) {         self.seq = seq         self.seq2 = seq2         self.id = id         self.value = value          super.init()     }      required init?(coder adecoder: nscoder) {         self.seq = adecoder.decodeobject(forkey: "seq") as? nsnumber         self.seq2 = adecoder.decodeinteger(forkey: "seq2")         self.id = adecoder.decodeobject(forkey: "id") as? string         self.value = adecoder.decodeobject(forkey: "value") as? string          super.init()     }      func encode(with acoder: nscoder) {         acoder.encode(seq, forkey: "seq")         acoder.encode(seq2, forkey: "seq2")         acoder.encode(id, forkey: "id")         acoder.encode(value, forkey: "value")     }      override var description: string { return "<model; seq=\(seq); seq2=\(seq2); id=\(id); value=\(value)>" } }