大小写切换按钮简化为 A/a 单字符

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

LearnEnglish/LearnEnglish/Models/Quiz.swift

@@ -71,7 +71,7 @@ enum QuizGenerator {
         let chars = Array(word)
         let letterPositions = chars.indices.filter { chars[$0].isLetter }
         guard !letterPositions.isEmpty else { return word }
-        let blankCount = min(letterPositions.count - 1, Int(ceil(Double(letterPositions.count) * 0.4)))
+        let blankCount = Int.random(in: 1...letterPositions.count)
         let indices = Set(letterPositions.shuffled().prefix(blankCount))
         return chars.enumerated().map { indices.contains($0.offset) ? "_" : String($0.element) }.joined()
     }

LearnEnglish/LearnEnglish/Views/QuizViewController.swift

@@ -36,14 +36,26 @@ final class QuizViewController: UIViewController {
         target: nil,
         action: nil
     )
+    private lazy var caseToggleItem = UIBarButtonItem(
+        title: "a", style: .plain, target: self, action: #selector(toggleCase)
+    )
 
     private var current: QuizQuestion? {
         questions.indices.contains(currentIndex) ? questions[currentIndex] : nil
     }
 
+    private var isUppercase: Bool
+
     init(config: QuizConfig) {
         self.config = config
-        self.questions = QuizGenerator.makeQuestions(mode: config.mode, words: config.words)
+        let uppercase = UserDefaults.standard.bool(forKey: "spelling_uppercase")
+        self.isUppercase = uppercase
+        let words = config.words.map { word in
+            let text = uppercase ? word.word.uppercased() : word.word.lowercased()
+            return Word(word: text, phonetic: word.phonetic, meaning: word.meaning,
+                        example: word.example, exampleMeaning: word.exampleMeaning)
+        }
+        self.questions = QuizGenerator.makeQuestions(mode: config.mode, words: words)
         super.init(nibName: nil, bundle: nil)
     }
 
@@ -187,7 +199,14 @@ final class QuizViewController: UIViewController {
         resultLabel.isHidden = true
         resultPhoneticLabel.isHidden = true
 
-        navigationItem.rightBarButtonItem = config.mode == .zhToEn ? nil : navSpeakerItem
+        if config.mode == .spelling {
+            updateCaseButton()
+            navigationItem.rightBarButtonItems = [navSpeakerItem, caseToggleItem]
+        } else if config.mode == .zhToEn {
+            navigationItem.rightBarButtonItems = nil
+        } else {
+            navigationItem.rightBarButtonItem = navSpeakerItem
+        }
 
         let isSpelling = config.mode == .spelling
         let isDictation = config.mode == .dictation
@@ -331,7 +350,7 @@ final class QuizViewController: UIViewController {
     private func submitSpelling(_ typed: String, for question: QuizQuestion) {
         guard selectedOption == nil else { return }
         selectedOption = typed
-        let correct = typed == question.answer
+        let correct = typed.lowercased() == question.answer.lowercased()
         if !correct {
             wrongWords.append(question.word)
         }
@@ -344,7 +363,7 @@ final class QuizViewController: UIViewController {
     private func submitDictation(_ typed: String, for question: QuizQuestion) {
         guard selectedOption == nil else { return }
         selectedOption = typed
-        let correct = typed == question.answer
+        let correct = typed.lowercased() == question.answer.lowercased()
         if !correct {
             wrongWords.append(question.word)
         }
@@ -390,6 +409,18 @@ final class QuizViewController: UIViewController {
         }
     }
 
+    @objc private func toggleCase() {
+        isUppercase.toggle()
+        UserDefaults.standard.set(isUppercase, forKey: "spelling_uppercase")
+        updateCaseButton()
+        restart()
+    }
+
+    private func updateCaseButton() {
+        caseToggleItem.title = isUppercase ? "A" : "a"
+        caseToggleItem.tintColor = .label
+    }
+
     @objc private func speakCurrentWord() {
         guard let question = current else { return }
         speech.speak(question.word.word)
@@ -465,7 +496,12 @@ final class QuizViewController: UIViewController {
         countdownTimer?.invalidate()
         countdownLabel.isHidden = true
         view.subviews.compactMap { $0 as? QuizResultView }.forEach { $0.removeFromSuperview() }
-        questions = QuizGenerator.makeQuestions(mode: config.mode, words: config.words)
+        let words = config.words.map { word in
+            let text = isUppercase ? word.word.uppercased() : word.word.lowercased()
+            return Word(word: text, phonetic: word.phonetic, meaning: word.meaning,
+                        example: word.example, exampleMeaning: word.exampleMeaning)
+        }
+        questions = QuizGenerator.makeQuestions(mode: config.mode, words: words)
         currentIndex = 0
         wrongWords = []
         startDate = .now

LearnEnglish/LearnEnglish/Views/SpellingInputView.swift

@@ -141,7 +141,7 @@ final class SpellingInputView: UIView, UITextFieldDelegate {
             let box = makeBox(fontSize: fontSize)
             box.tag = index
             if ch != "_", let label = box.viewWithTag(100) as? UILabel {
-                label.text = ch.uppercased()
+                label.text = ch
                 label.isHidden = false
             }
             box.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(boxTapped(_:))))
@@ -199,7 +199,7 @@ final class SpellingInputView: UIView, UITextFieldDelegate {
             }
             let label = box.viewWithTag(100) as? UILabel
             let filled = filledBlanks[blankIndex]
-            label?.text = filled.uppercased()
+            label?.text = filled
             label?.isHidden = filled.isEmpty
 
             let isCurrent = inputEnabled && blankIndex == cursorIndex