空き容量取得メモ ref: http://qiita.com/MTattin/items/103c7b47903108c68d2d

file0.swift

    /**
    容量取得
    - returns: freeとtotalのサイズ取得
    */
    static func GetDiskSize() -> (free: Double?, total: Double?) {
        let _0_paths: NSArray = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.LibraryDirectory, NSSearchPathDomainMask.UserDomainMask, true)
        let _0_last: String = _0_paths.lastObject as! String
        do {
            let _0_dic: NSDictionary = try   NSFileManager.defaultManager().attributesOfFileSystemForPath(_0_last)
            return (
                (_0_dic[NSFileSystemFreeSize] as! NSNumber).doubleValue,
                (_0_dic[NSFileSystemSize] as! NSNumber).doubleValue
            )
        } catch let e as NSError {
            print("error : \(e.localizedDescription)")
            return (nil, nil)
        }
    }