swift - 使 Swift (2.1) 枚举符合 AnyObject

Answer 1

这是不正确的：

public typealias RESTPostDictionary = [RESTPostDictionaryKey : AnyObject]

你的意思是这样的：

public typealias RESTPostDictionary = [String : AnyObject]

枚举不是字符串。但它是您打算用作键的字符串。

当您使用枚举大小写作为键时，取它的rawValue：

postDictionary[RESTRequestDictionaryKey.Requests.rawValue] = requestDictionaries

因此，例如，这是合法的：

enum Keys : String {
    case Key1 = "hey"
    case Key2 = "ho"
    case Key3 = "hey nonny no"
}

var d = [String:AnyObject]()
d[Keys.Key1.rawValue] = 1
d[Keys.Key2.rawValue] = 2

Answer 2

class Box<T> {
  let value: T
  init(value: T) {
    self.value = value
  }
}
NSNotificationCenter.defaultCenter().postNotificationName("foo", object: Box(value: YourOwnStruct())) // OK

如果以该类型实现 AnyObjectConvertible，则可以转换 struct/enum 目录。

extension YourOwnStruct: AnyObjectConvertible {}

NSNotificationCenter.defaultCenter().postNotificationName("foo", object: YourOwnStruct()) // OK let value = notification.object as? YourOwnStruct

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Answer 3

为什么不简单地使用枚举作为键？

import Foundation

enum E:String, CustomStringConvertible {
    var description: String { return self.rawValue }
    case A = "text A"
    case B = "B text"
    case C = "neither A nor B but C"
}

var dict: Dictionary<E, Any> = [:]
dict[E.A] = "alfa"
dict[E.B] = 1
dict[E.C] = NSDate()

dump(dict)

/*
▿ 3 key/value pairs
▿ [0]: (2 elements)
- .0: E.C
- .1: Nov 8, 2015, 11:01 AM
▿ [1]: (2 elements)
- .0: E.A
- .1: alfa
▿ [2]: (2 elements)
- .0: E.B
- .1: 1
*/

print(dict)
// [neither A nor B but C: 2015-11-08 10:02:47 +0000, text A: "alfa", B text: 1]

可以转换为 JSON 的对象必须具有以下属性：

顶级对象是 NSArray 或 NSDictionary。

所有对象都是 NSString、NSNumber、NSArray、NSDictionary 或 NSNull 的实例。

所有字典键都是 NSString 的实例。

数字不是 NaN 或无穷大。

import Foundation

enum E:String, CustomStringConvertible {
    var description: String { return self.rawValue }
    case A = "key A"
    case B = "key B"
    case C = "key C"
}

var dict: Dictionary<NSString, AnyObject> = [:]

dict[E.A.description] = "alfa"
dict[E.B.description] = [1,2,3]
dict[E.C.description] = NSDate()

dict is AnyObject // false
let nsdict = dict as NSDictionary
nsdict is AnyObject // true
print(nsdict)

/*

{
    "key A" = alfa;
    "key B" =     (
        1,
        2,
        3
    );
    "key C" = "2015-11-09 23:13:31 +0000";
}
*/