從UserDefaults擴展數組

Question

我正在嘗試擴展已保存在UserDefaults中的數組。 我有2個視圖，在第一個視圖中，我聲明具有3個主題的數組，然后將其保存在UserDefaults中。 在第二個視圖中，我可以打印它們，但是當我嘗試使用UITextView中的新主題擴展數組時，出現錯誤消息

線程1：EXC_BAD_INSTRUCTION（代碼= EXC_l386_INVOP，子代碼= 0x0）

我究竟做錯了什么？

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)
    }
}

}

和第二個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

在此代碼中從數組中刪除var聲明以使用全局數組

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)

所以總代碼-

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()