学习记录新增正确率统计，每次拼写验证追踪对错并计算百分比

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

LearnEnglish/LearnEnglish/Models/LearnedStore.swift

@@ -4,6 +4,11 @@ struct LearnedRecord: Codable {
     let word: Word
     var learnedAt: Date
     var count: Int = 1
+    var correctCount: Int = 0
+
+    var accuracy: Int {
+        count > 0 ? Int(Double(correctCount) / Double(count) * 100) : 0
+    }
 }
 
 final class LearnedStore {
@@ -26,12 +31,15 @@ final class LearnedStore {
         }
     }
 
-    func record(_ word: Word) {
+    func record(_ word: Word, correct: Bool) {
         if let index = records.firstIndex(where: { $0.word.id == word.id }) {
             records[index].learnedAt = Date()
             records[index].count += 1
+            if correct { records[index].correctCount += 1 }
         } else {
-            records.append(LearnedRecord(word: word, learnedAt: Date()))
+            var rec = LearnedRecord(word: word, learnedAt: Date())
+            if correct { rec.correctCount = 1 }
+            records.append(rec)
         }
     }
 

LearnEnglish/LearnEnglish/Views/HistoryViewController.swift

@@ -67,7 +67,7 @@ final class HistoryViewController: UITableViewController {
     override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
         let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! WordCardCell
         let record = sections[indexPath.section].items[indexPath.row]
-        cell.configure(with: record.word, count: record.count)
+        cell.configure(with: record.word, count: record.count, accuracy: record.accuracy)
         cell.onSpeak = { word in
             SpeechService.shared.speak(word.word)
         }

LearnEnglish/LearnEnglish/Views/QuizViewController.swift

@@ -357,8 +357,8 @@ final class QuizViewController: UIViewController {
     private func submitSpelling(_ typed: String, for question: QuizQuestion) {
         guard selectedOption == nil else { return }
         selectedOption = typed
-        LearnedStore.shared.record(question.word)
         let correct = typed.lowercased() == question.answer.lowercased()
+        LearnedStore.shared.record(question.word, correct: correct)
         if !correct {
             wrongWords.append(question.word)
         }

LearnEnglish/LearnEnglish/Views/WordCardCell.swift

@@ -92,9 +92,9 @@ final class WordCardCell: UITableViewCell {
         updateSpeakerState()
     }
 
-    func configure(with word: Word, count: Int) {
+    func configure(with word: Word, count: Int, accuracy: Int) {
         configure(with: word)
-        countLabel.text = "\(count)次"
+        countLabel.text = "\(count)次 · \(accuracy)%"
         countLabel.isHidden = false
     }