回答編集履歴
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解決したのでしたら良かったです、回答を書いていたので一応載せておきます。
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`UserDefaults`は配列を格納できますので、文字列を保存するより、文字列の配列を保存したほうが扱いやすいです。
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自分なりに書き直して見ましたので参考にしてください。
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```swift
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import UIKit
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class ListViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
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@IBOutlet weak var mainSpinner: UIPickerView! {
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didSet {
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mainSpinner.delegate = self
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mainSpinner.dataSource = self
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}
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}
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var workNames: [String] = []
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override func viewDidLoad() {
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super.viewDidLoad()
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// ダミーの初期値
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UserDefaults.standard.workNames = ["work1", "work2", "work3"]
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}
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override func viewWillAppear(_ animated: Bool) {
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super.viewWillAppear(animated)
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// 動作確認のために次の画面から戻った時にUserDefaults配列に一つ追加
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var workNames = UserDefaults.standard.workNames
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workNames.append("work")
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UserDefaults.standard.workNames = workNames
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}
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override func viewDidAppear(_ animated: Bool) {
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super.viewDidAppear(animated)
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// UserDefaultsから配列を取得してPickerをリロード
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workNames = UserDefaults.standard.workNames
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mainSpinner.reloadAllComponents()
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}
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func numberOfComponents(in pickerView: UIPickerView) -> Int {
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return 1
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}
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func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
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return workNames.count
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}
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func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
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return workNames[row]
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}
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func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
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print("row: (row)")
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print("value: (workNames[row])")
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}
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}
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// UserDefaultの拡張
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extension UserDefaults {
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var workNames: [String] {
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get {
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guard let workNames = UserDefaults.standard.object(forKey: "WorkNames") as? [String] else { return [] }
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}
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set { UserDefaults.standard.set(newValue, forKey: "WorkNames") }
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}
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}
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```
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