是否可以使用NSCoding存储元组？我有一个像元组((UInt8,UInt8),(UInt8,UInt8)).但是aCoder.encodeObject(myTuple)不起作用.我是否必须将元组转换为NSData,或者这绝对不可能？谢谢你的帮助
元组不能编码,因为它不是一个类,但一种方法是分别编码元组的每个组件,然后在解码时解码每个组件,然后将元组的值设置为由解码内容构造的元组.
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let obj = SomeClass()
obj.foo = (6,5)
let data = NSKeyedArchiver.archivedDataWithRootObject(obj)
NSUserDefaults.standardUserDefaults().setObject(data,forKey: "books")
if let data = NSUserDefaults.standardUserDefaults().objectForKey("books") as? NSData {
let o = NSKeyedUnarchiver.unarchiveObjectWithData(data) as SomeClass
println(o.foo) // (Optional(6),Optional(5))
}
}
}
class SomeClass: NSObject,NSCoding {
var foo: (x: Int?,y: Int?)!
required convenience init(coder decoder: NSCoder) {
self.init()
let x = decoder.decodeObjectForKey("myTupleX") as Int?
let y = decoder.decodeObjectForKey("myTupleY") as Int?
foo = (x,y)
}
func encodeWithCoder(coder: NSCoder) {
coder.encodeObject(foo.x,forKey: "myTupleX")
coder.encodeObject(foo.y,forKey: "myTupleY")
}
}
