学习模式拼写页面加入刷新倒计时提示

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

LearnEnglish/LearnEnglish/Views/QuizViewController.swift

@@ -21,9 +21,11 @@ final class QuizViewController: UIViewController {
     private let spellingHintLabel = UILabel()
     private let resultLabel = UILabel()
     private let resultPhoneticLabel = UILabel()
+    private let countdownLabel = UILabel()
     private let nextButton = UIButton(type: .system)
     private var optionButtons: [UIButton] = []
     private var optionIcons: [UIImageView] = []
+    private var countdownTimer: Timer?
 
     private let promptStack = UIStackView()
     private let inputStack = UIStackView()
@@ -48,6 +50,10 @@ final class QuizViewController: UIViewController {
     @available(*, unavailable)
     required init?(coder: NSCoder) { fatalError() }
 
+    deinit {
+        countdownTimer?.invalidate()
+    }
+
     override func viewDidLoad() {
         super.viewDidLoad()
         view.backgroundColor = .systemBackground
@@ -135,7 +141,11 @@ final class QuizViewController: UIViewController {
 
         resultStack.axis = .vertical
         resultStack.spacing = 12
-        [resultLabel, resultPhoneticLabel, nextButton].forEach { resultStack.addArrangedSubview($0) }
+        countdownLabel.font = .preferredFont(forTextStyle: .caption1)
+        countdownLabel.textColor = .tertiaryLabel
+        countdownLabel.textAlignment = .center
+        countdownLabel.isHidden = true
+        [resultLabel, resultPhoneticLabel, countdownLabel, nextButton].forEach { resultStack.addArrangedSubview($0) }
 
         let mainStack = UIStackView(arrangedSubviews: [headerStack, promptStack, inputStack, resultStack, UIView()])
         mainStack.axis = .vertical
@@ -358,6 +368,18 @@ final class QuizViewController: UIViewController {
         if config.isStudyMode {
             nextButton.isHidden = true
             let delay: TimeInterval = correct ? 1.0 : 3.0
+            countdownLabel.text = "\(Int(delay)) 秒后继续"
+            countdownLabel.isHidden = false
+            countdownTimer?.invalidate()
+            var remaining = Int(delay)
+            countdownTimer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { [weak self] timer in
+                remaining -= 1
+                if remaining > 0 {
+                    self?.countdownLabel.text = "\(remaining) 秒后继续"
+                } else {
+                    timer.invalidate()
+                }
+            }
             DispatchQueue.main.asyncAfter(deadline: .now() + delay) { [weak self] in
                 self?.restart()
             }
@@ -440,6 +462,8 @@ final class QuizViewController: UIViewController {
     }
 
     private func restart() {
+        countdownTimer?.invalidate()
+        countdownLabel.isHidden = true
         view.subviews.compactMap { $0 as? QuizResultView }.forEach { $0.removeFromSuperview() }
         questions = QuizGenerator.makeQuestions(mode: config.mode, words: config.words)
         currentIndex = 0