从UserDefaults扩展数组

Question

我正在尝试扩展已保存在UserDefaults中的数组。 我有2个视图，在第一个视图中，我声明具有3个主题的数组，然后将其保存在UserDefaults中。 在第二个视图中，我可以打印它们，但是当我尝试使用UITextView中的新主题扩展数组时，出现错误消息

线程1：EXC_BAD_INSTRUCTION（代码= EXC_l386_INVOP，子代码= 0x0）

我究竟做错了什么？

class ViewController: UIViewController {

@IBOutlet weak var text: UITextView!

var array: [String] = ["Prvni", "Druhy"]
var prvni = ""


override func viewDidLoad() {
    super.viewDidLoad()
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func zapsat(_ sender: UIButton) {

    prvni = text.text!
    array.insert(prvni, at: 2)

    let defaults = UserDefaults.standard

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

    defaults.synchronize()
}


@IBAction func vypsat(_ sender: UIButton) {
    if((UserDefaults.standard.array(forKey: "KEY")) != nil){
        let historyWords = (UserDefaults.standard.array(forKey: "KEY") as? [String])!
        print(historyWords)
    }
}

}

和第二个viewcontroller

class druhy: UIViewController {

var array = [String]()
var druhy = ""
@IBOutlet weak var text: UITextView!

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func vypsat(_ sender: UIButton) {
    if((UserDefaults.standard.array(forKey: "KEY")) != nil){
        let historyWords = (UserDefaults.standard.array(forKey: "KEY") as? [String])!
        print(historyWords)
    }
}

@IBAction func zapsat(_ sender: UIButton) {

    druhy = text.text!
    if((UserDefaults.standard.array(forKey: "KEY")) != nil){
        var array = (UserDefaults.standard.array(forKey: "KEY") as? [String])!
        print(array)
    }
    array.insert(druhy, at: 3)

    let defaults = UserDefaults.standard

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

    defaults.synchronize()
}

}

Answer 1

在此代码中从数组中删除var声明以使用全局数组

var array = (UserDefaults.standard.array(forKey: "KEY") as? [String])!

至

array = (UserDefaults.standard.array(forKey: "KEY") as? [String])!

然后使用插入而不是插入

array.append(druhy)

所以总代码-

druhy = text.text!
    if((UserDefaults.standard.array(forKey: "KEY")) != nil){
        array = (UserDefaults.standard.array(forKey: "KEY") as? [String])!
        print(array)
    }
    array.append(druhy,)

    let defaults = UserDefaults.standard

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

    defaults.synchronize()