在Swift中将NSDictionary转换为NSData和将NSData转换为NSDictionary

Question

在Swift中将NSDictionary转换为NSData和将NSData转换为NSDictionary

59

我不确定我是在错误地使用字典还是数据对象，或者两者都有误。我正在尝试适应切换到Swift，但我遇到了一些小麻烦。

var dictionaryExample : [String:AnyObject] =
    ["user":"UserName",
     "pass":"password",
    "token":"0123456789",
    "image":0] // image should be either NSData or empty

let dataExample : NSData = dictionaryExample as NSData

我需要将NSDictionary编码为一个NSData对象，同时还需将该NSData对象解码为NSDictionary。

非常感谢任何帮助。

- IanTimmis

你实际上想要实现什么？如果你不指定NSData的格式，那么说“将NSDictionary转换为NSData”是没有意义的。 - gnasher729

6个回答

11

Swift 5

正如 @yuyeqingshan 所说，PropertyListSerialization 是一个不错的选择。

       // Swift Dictionary To Data.
        do {
            let data = try PropertyListSerialization.data(fromPropertyList: [:], format: PropertyListSerialization.PropertyListFormat.binary, options: 0)
            // do sth
        } catch{
            print(error)
        }


        // Data to Swift Dictionary
        do {
            let dicFromData = try PropertyListSerialization.propertyList(from: data, options: PropertyListSerialization.ReadOptions.mutableContainers, format: nil)
            if let dict = dicFromData as? [String: Any]{
                // do sth
            }
        } catch{
            print(error)
        }

- DNG

9

NSPropertyListSerialization可能是另一个解决方案。

// Swift Dictionary To Data.
var data = try NSPropertyListSerialization.dataWithPropertyList(dictionaryExample, format: NSPropertyListFormat.BinaryFormat_v1_0, options: 0)

// Data to Swift Dictionary
var dicFromData = (try NSPropertyListSerialization.propertyListWithData(data, options: NSPropertyListReadOptions.Immutable, format: nil)) as! Dictionary<String, AnyObject>

- yuyeqingshan

3

针对Swift3：

let data = try PropertyListSerialization.data(fromPropertyList: authResponse, format: PropertyListSerialization.PropertyListFormat.binary, options: 0)

- ingconti

3

Leo的回答给我带来了构建时间错误，因为NSData与Data不同。函数unarchiveObject(with:)需要一个类型为Data的变量，而函数unarchiveTopLevelObjectWithData()需要一个类型为NSData的变量。

以下是可用的Swift 3答案：

var names : NSDictionary = ["name":["John Smith"], "age": 35]
let namesData : NSData = NSKeyedArchiver.archivedData(withRootObject: names) as NSData
do{
    let backToNames = try NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(namesData) as! NSDictionary
    print(backToNames)
}catch{
    print("Unable to successfully convert NSData to NSDictionary")
}

- Ujjwal-Nadhani

-3

对于Swift 4 -

let dictionaryExample : [String:AnyObject] = ["user":"UserName" as AnyObject, "pass":"password" as AnyObject, "token":"0123456789" as AnyObject, "image":0 as AnyObject]
    let dataExample : NSData = NSKeyedArchiver.archivedData(withRootObject: dictionaryExample) as NSData
    let dictionary:NSDictionary? = NSKeyedUnarchiver.unarchiveObject(with: dataExample as Data)! as? NSDictionary

- Abhishek Mishra

4

糟糕的例子。虽然你说了“Swift 4”，但实际上你却将NSData强制转换为Data，而没有直接使用Data；你还在使用AnyObject而不是Any，并且你对可选项(optional)的使用远未达到最佳状态... - Eric Aya

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Leo · Accepted Answer

您可以使用NSKeyedArchiver和NSKeyedUnarchiver。

Swift 2.0+示例：

var dictionaryExample : [String:AnyObject] = ["user":"UserName", "pass":"password", "token":"0123456789", "image":0]
let dataExample : NSData = NSKeyedArchiver.archivedDataWithRootObject(dictionaryExample)
let dictionary:NSDictionary? = NSKeyedUnarchiver.unarchiveObjectWithData(dataExample)! as? NSDictionary

Swift3.0

let dataExample: Data = NSKeyedArchiver.archivedData(withRootObject: dictionaryExample)
let dictionary: Dictionary? = NSKeyedUnarchiver.unarchiveObject(with: dataExample) as! [String : Any]

Playground 的屏幕截图