如何在Swift中使用用户默认值?

How can I use UserDefaults to save/retrieve strings, booleans and other data in Swift?

如何使用UserDefaults以Swift保存/检索字符串、布尔值和其他数据?

6 个解决方案

#1

ref: NSUserdefault objectTypes

裁判:nsuserdefaults objecttype

Swift 3 and above

Store

商店

UserDefaults.standard.set(true, forKey: "Key") //Bool
UserDefaults.standard.set(1, forKey: "Key")  //Integer
UserDefaults.standard.set("TEST", forKey: "Key") //setObject

Retrieve

检索

 UserDefaults.standard.bool(forKey: "Key")
 UserDefaults.standard.integer(forKey: "Key")
 UserDefaults.standard.string(forKey: "Key")

Remove

删除

 UserDefaults.standard.removeObject(forKey: "Key")

Swift 2 and below

Store

商店

NSUserDefaults.standardUserDefaults().setObject(newValue, forKey: "yourkey")
NSUserDefaults.standardUserDefaults().synchronize()

Retrieve

检索

  var returnValue: [NSString]? = NSUserDefaults.standardUserDefaults().objectForKey("yourkey") as? [NSString]

Remove

删除

 NSUserDefaults.standardUserDefaults().removeObjectForKey("yourkey")

---

UserDefaults suit name

another one property suit name, mostly its used for App Groups concept, the example scenario I taken from here :

另一个属性名称，主要用于应用程序组概念，我从这里取的示例场景:

The use case is that I want to separate my UserDefaults (different business logic may require Userdefaults to be grouped separately) by an identifier just like Android's SharedPreferences. For example, when a user in my app clicks on logout button, I would want to clear his account related defaults but not location of the the device.

用例是，我想将我的UserDefaults(不同的业务逻辑可能需要将UserDefaults分开分组)与一个标识符分开，就像Android的SharedPreferences一样。例如，当我的应用程序中的用户单击logout按钮时，我希望清除他的账户相关默认值，而不是设备的位置。

let user = UserDefaults(suiteName:"User")

use of userDefaults synchronize, the detail info has added in the duplicate answer.

使用userDefaults同步，详细信息已经添加到重复的答案中。

#2

Best way to use UserDefaults

使用UserDefaults的最好方法

Steps

步骤

1. Create extension of UserDefaults
2. 创建扩展UserDefaults
3. Create enum with required Keys to store in local
4. 创建枚举，并在本地存储所需的密钥
5. Store and retrieve the local data wherever you want
6. 在任何需要的地方存储和检索本地数据。

Sample

样本

extension UserDefaults{

    //MARK: Check Login
    func setLoggedIn(value: Bool) {
        set(value, forKey: UserDefaultsKeys.isLoggedIn.rawValue)
        //synchronize()
    }

    func isLoggedIn()-> Bool {
        return bool(forKey: UserDefaultsKeys.isLoggedIn.rawValue)
    }

    //MARK: Save User Data
    func setUserID(value: Int){
        set(value, forKey: UserDefaultsKeys.userID.rawValue)
        //synchronize()
    }

    //MARK: Retrieve User Data
    func getUserID() -> Int{
        return integer(forKey: UserDefaultsKeys.userID.rawValue)
    }
}

enum for Keys used to store data

用于存储数据的键的enum

enum UserDefaultsKeys : String {
    case isLoggedIn
    case userID
}

Save in UserDefaults where you want

在用户默认设置中保存

UserDefaults.standard.setLoggedIn(value: true)          // Bool
UserDefaults.standard.setUserID(value: result.User.id!) // integer

Retrieve data anywhere in app

在应用程序的任何地方检索数据

print("ID : \(UserDefaults.standard.getUserID())")
UserDefaults.standard.getUserID()

Remove Values

删除值

UserDefaults.standard.removeObject(forKey: UserDefaultsKeys.userID) 

This way you can store primitive data in best

通过这种方式，您可以最好地存储原始数据

Update You need no use synchronize() to store the values. As @Moritz pointed out the it unnecessary and given the article about it.Check comments for more detail

不需要使用synchronize()来存储值。正如@Moritz指出的那样，这是不必要的，并给出了相关的文章。检查注释以获得更详细的信息。

#3

Swift 4 :

斯威夫特4:

Store

商店

    UserDefaults.standard.set(object/value, forKey: "key_name")

Retrive

索取

    var returnValue: [datatype]? = UserDefaults.standard.object(forKey: "key_name") as? [datatype]

Remove

删除

    UserDefaults.standard.removeObject(forKey:"key_name") 

#4

You can use NSUserDefaults in swift this way,

可以使用NSUserDefaults这种方式，

@IBAction func writeButton(sender: UIButton)
{
    let defaults = NSUserDefaults.standardUserDefaults()
    defaults.setObject("defaultvalue", forKey: "userNameKey")

}

@IBAction func readButton(sender: UIButton)
{
    let defaults = NSUserDefaults.standardUserDefaults()
    let name = defaults.stringForKey("userNameKey")
    println(name) //Prints defaultvalue in console
}

#5

//Save
NSUserDefaults.standardUserDefaults().setObject("yourString", forKey: "YourStringKey")

//retrive
let yourStr : AnyObject? = NSUserDefaults.standardUserDefaults().objectForKey("YourStringKey")

#6

I saved NSDictionary normally and able to get it correctly.

我正常地保存了NSDictionary并且能够正确地获取它。

 dictForaddress = placemark.addressDictionary! as NSDictionary
        let userDefaults = UserDefaults.standard
        userDefaults.set(dictForaddress, forKey:Constants.kAddressOfUser)

// For getting data from NSDictionary.

//用于从NSDictionary获取数据。

let userDefaults = UserDefaults.standard
    let dictAddress = userDefaults.object(forKey: Constants.kAddressOfUser) as! NSDictionary