ios Swift 中 NSDictionary 到 NSData 和 NSData 到 NSDictionary
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NSDictionary to NSData and NSData to NSDictionary in Swift
提问by IanTimmis
I am not sure if I am using the dictionary or the data object or both incorrectly. I m trying to get used to the switch to swift but I'm having a little trouble.
我不确定我是否错误地使用了字典或数据对象或两者。我正在尝试习惯切换到 swift，但我遇到了一些麻烦。
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
I need the NSDictionaryto encode to an NSDataobject as well as taking that NSDataobject and decode it into a NSDictionary.
我需要NSDictionary对一个NSData对象进行编码，以及将该NSData对象解码为NSDictionary.
Any help is greatly appreciated, thanks.
非常感谢任何帮助，谢谢。
回答by Leo
You can use NSKeyedArchiverand NSKeyedUnarchiver
您可以使用NSKeyedArchiver和NSKeyedUnarchiver
Example for swift 2.0+
swift 2.0+ 的示例
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
斯威夫特3.0
let dataExample: Data = NSKeyedArchiver.archivedData(withRootObject: dictionaryExample)
let dictionary: Dictionary? = NSKeyedUnarchiver.unarchiveObject(with: dataExample) as! [String : Any]
Screenshot of playground
游乐场截图
回答by yuyeqingshan
NSPropertyListSerialization may be an alternative solution.
NSPropertyListSerialization 可能是另一种解决方案。
// 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>
回答by ingconti
For Swift 3:
对于 Swift 3：
let data = try PropertyListSerialization.data(fromPropertyList: authResponse, format: PropertyListSerialization.PropertyListFormat.binary, options: 0)
回答by Ujjwal-Nadhani
Leo's answergave me build time errors because NSDataisn't the same as Data. The function unarchiveObject(with:)takes a variable of type Data, whereas the function unarchiveTopLevelObjectWithData()takes a variable of type NSData.
Leo 的回答给了我构建时间错误，因为NSData与Data. 该函数unarchiveObject(with:)接受一个类型的变量Data，而该函数unarchiveTopLevelObjectWithData()接受一个类型的变量NSData。
This is a working Swift 3answer:
这是一个有效的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")
}
回答by DNG
Swift 5
斯威夫特 5
as @yuyeqingshan said, PropertyListSerializationis a good option
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)
}
回答by Abhishek Mishra
For Swift 4 -
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
