From your code I see you are storing some array

从你的代码我看到你正在存储一些数组

// Your code
NSUserDefaults.standardUserDefaults().setObject(myArray, forKey: "\(identity.text!)listA")

and retrieving a string

并检索字符串

//Your code
let tabledata = NSUserDefaults.standardUserDefaults().stringForKey("\(identity.text!)listA")

There is probably a type mismatch, You store one type and retrieve another type.

可能存在类型不匹配，您存储一种类型并检索另一种类型。

While retrieving either use arrayForKey()or objectForKey()see the code below.

在检索时使用arrayForKey()或objectForKey()查看下面的代码。

let tabledata = NSUserDefaults.standardUserDefaults().arrayForKey("\(identity.text!)listA") 

or

或者

let tabledata = NSUserDefaults.standardUserDefaults().objectForKey("\(identity.text!)listA")

If it is an array I would go with First one.

如果它是一个数组，我会选择第一个。

Here are the way that you can store and retrieved array of object with help of NSKeyArchive.

以下是您可以在 的帮助下存储和检索对象数组的方法NSKeyArchive。

To Store array to NSUserDefault.

将数组存储到 NSUserDefault。

let placesData = NSKeyedArchiver.archivedData(withRootObject: placesArray)
UserDefaults.standard.set(placesData, forKey: "places")

To Retrieved array from NSUserDefault.

从 NSUserDefault 检索数组。

let placesData = UserDefaults.standard.object(forKey: "places") as? NSData

if let placesData = placesData {
    let placesArray = NSKeyedUnarchiver.unarchiveObject(with: placesData as Data) as? [Place]
    print(placesArray)
}

Hope this help you.

希望这对你有帮助。

Saving and Retrieving a String array to UserDefaults

将字符串数组保存和检索到 UserDefaults

Save array

保存数组

let array = ["horse", "cow", "camel", "sheep", "goat"]

let defaults = UserDefaults.standard
defaults.set(array, forKey: "SavedStringArray")

Retrieve array

检索数组

let defaults = UserDefaults.standard
let array = defaults.object(forKey: "SavedStringArray") as? [String] ?? [String]()

See more at How to save user settings using NSUserDefaults

在如何使用 NSUserDefaults 保存用户设置中查看更多信息

What are you storing in the array?

你在数组中存储什么？

If it's objects it won't work, if It's just strings or numbers then it should be fine.

如果它是对象，它将不起作用，如果它只是字符串或数字，那么它应该没问题。

Next steps you take should be to turn on exception breakpoints and maybe println() everything you can so you can pinpoint the exact whereabouts of the problem.

您接下来应该采取的步骤应该是打开异常断点，可能还有 println() 一切可能，以便您可以查明问题的确切位置。

As a shot in the dark I would suggest maybe (identity.text!) is coming out as nil

作为在黑暗中的一个镜头，我建议也许 (identity.text!) 出现为零

Also you should probably change it to this

你也应该把它改成这个

if let tabledata: NSArray = NSUserDefaults.standardUserDefaults().stringForKey("\(identity.text!)listA"){

    myArray = [tabledata!]

    tableView.reloadData()
}

This will make the code not even try to run unless there is a value it can use

这将使代码甚至不会尝试运行，除非有它可以使用的值

Latest swift3 version to store array of data into userdefaults and get that array of data using keys

最新的 swift3 版本将数据数组存储到用户默认值中并使用键获取该数据数组

    let nameArray = ["Ramu","JAGAN","Steve","Swift"]
    let namesArrayData = NSKeyedArchiver.archivedData(withRootObject: nameArray)
    UserDefaults.standard.set(namesArrayData, forKey: "arrayData")

RetriveData

检索数据

        let retriveArrayData= UserDefaults.standard.object(forKey:  "arrayData") as? NSData

   if let retriveArrayData= namesArrayData{
  let retriveArray = NSKeyedUnarchiver.unarchiveObject(with: namesArraydata as Data) as? [nameArray]
  print(retriveArray )
}

This has been changed in swift 3. Note that this works with device but not playground or simulator

这已在 swift 3 中更改。请注意，这适用于设备，但不适用于操场或模拟器

//store the array
let array = ["horse", "cow", "camel", "sheep", "goat"]

let defaults = UserDefaults.standard

defaults.setValue(array, forKey: "history")

defaults.synchronize()

//Retrieve the array
if((UserDefaults.standard.array(forKey: "history")) != nil){
    let historyWords = (UserDefaults.standard.array(forKey: "history") as? [String])!
    print(historyWords)
}

Store into User Default:

存储到用户默认值：

let arrayFruit = ["Apple","Banana","Orange","Grapes","Watermelon"]    
 //store in user default
UserDefaults.standard.set(arrayFruit, forKey: "arrayFruit")

Retrieving array from User Defaults:

从用户默认值中检索数组：

if let arr = UserDefaults.standard.array(forKey: "arrayFruit") as? [String]{
    print(arr)
}