NSArrayやNSDictionaryを、SwiftのArrayやDictionaryと相互に変換する

背景

ちょっと調べないと分からなかったので。

変換方法

実はほぼそのままキャストできてしまう模様。

Array

// Array -> NSArray
var nsarr: NSArray = NSArray(array: ["A", "B", "C"])
println(nsarr)

// NSArray -> Array
var arr: [String] = nsarr as [String]
println(arr)

(
    A,
    B,
    C
)
[A, B, C]

Dictionary

// Dictionary -> NSDictionary
var nsdic: NSDictionary = NSDictionary(dictionary: ["key1": "value1", "key2": "value2"])
println(nsdic)

// NSDictionary -> Dictionary
var dic: Dictionary = nsdic as Dictionary
println(dic)

{
    key1 = value1;
    key2 = value2;
}
[key2: value2, key1: value1]

おまけ: Array of Dictionary

var sample: [Dictionary<String, AnyObject>] = [
    ["key1": "value1", "key2": "value2"],
    ["key3": "value3", "key4": "value4"]]

// Array of Dictionary -> NSArray of NSDictionary
var nsdicarr: NSArray = NSArray(array: sample)
println(nsdicarr)

// NSArray of NSDictionary -> Array of Dictionary
var dicarr: [Dictionary<String, AnyObject>] = nsdicarr as [Dictionary<String, AnyObject>]
println(dicarr)

output

(
        {
        key1 = value1;
        key2 = value2;
    },
        {
        key3 = value3;
        key4 = value4;
    }
)
[[key2: value2, key1: value1], [key4: value4, key3: value3]]

参考

Mac Developers blog — Convert NSMutableArray to Swift Array...
http://dev.eltima.com/post/96538497489/convert-nsmutablearray-to-swift-array