Swift UserDefaults get values from array

问题

I have UserDefaults array like:

let userValue = ["name": self.nameLbl.text ?? "", "lastName": self.lastNameLbl.text ?? "", "city": cityLbl.text ?? ""] as! [String : String]
var userArray = UserDefaults.standard.array(forKey: "userInfo") as? [[String: String]] ?? []
userArray.append(userValue)
UserDefaults.standard.set(userArray, forKey: "userInfo")

How can I get key values example to print type

[["name": .., "lastName":..,],["name": .., "lastName":..,],["name": .., "lastName":..,]...]

If I print like this :

if let array = UserDefaults.standard.array(forKey: "userInfo") as? [[String: String]] {
    for dictionary in array {
        print(dictionary["name"])
        print(dictionary["lastName"])
        print(dictionary["city"])
    }
}

in console get :

Lars James Ulrich Hetfield Gentofte California

I want it like this : [[ Lars, Ulrich,Gentofte],[James, Hetfield, California]]

回答1:

You have to add key-value pair in the array and then print array. You will get your expected answer

let userValue = ["name": self.nameLbl.text ?? "", "lastName": self.lastNameLbl.text ?? "", "city": cityLbl.text ?? ""] as! [String : String]
        var userArray = UserDefaults.standard.array(forKey: "userInfo") as? [[String: String]] ?? []

        // Appending the different -2 userValue to userArray
        userArray.append(userValue)
        userArray.append(userValue)

        UserDefaults.standard.set(userArray, forKey: "userInfo")

        if let array = UserDefaults.standard.array(forKey: "userInfo") as? [[String: String]] {

       var dataValues = Array<Any>()
       array.forEach { (object) in
       dataValues.append(Array(object.values))
      }
    print(dataValues)

 }

Here you can check demo:

let userValue = ["name": "j", "lastName":  "o", "city":  "g"] as! [String : String]

// Appending the different -2 userValue to userArray
var a = [userValue, userValue, userValue]

var b = Array<Any>()
a.forEach { (object) in
    b.append(Array(object.values))
}
print(b)

回答2:

To add an key-value pair to existing array, you just to need to append userValue to your array. Like:

    let userValue = ["name": self.nameLbl.text ?? "", "lastName": self.lastNameLbl.text ?? "", "city": cityLbl.text ?? ""] as! [String : String]
    var userArray = UserDefaults.standard.array(forKey: "userInfo") as? [[String: String]] ?? []

    // Append the userValue to userArray
    userArray.append(userValue)

    UserDefaults.standard.set(userArray, forKey: "userInfo")

To fetch the dictionary from the array you can use

    if let array = UserDefaults.standard.array(forKey: "userInfo") as? [[String: String]] {
        for dictionary in array {
            print(dictionary["name"])
            print(dictionary["lastName"])
            print(dictionary["city"])
        }
    }

来源：https://stackoverflow.com/questions/50193212/swift-userdefaults-get-values-from-array

标签

arrays

swift

nsuserdefaults