数字分类支持 1-999 数字学习，按规则运行时生成词条

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

LearnEnglish/LearnEnglish/Views/SpellingInputView.swift

@@ -126,8 +126,19 @@ final class SpellingInputView: UIView, UITextFieldDelegate {
 
     private func rebuildBoxes() {
         stack.arrangedSubviews.forEach { $0.removeFromSuperview() }
+        let count = CGFloat(max(chars.count, 1))
+        let available = (window?.screen.bounds.width ?? 390) - 32
+        var spacing: CGFloat = 6
+        var boxWidth = (available - spacing * (count - 1)) / count
+        if boxWidth < 16 {
+            spacing = 3
+            boxWidth = (available - spacing * (count - 1)) / count
+        }
+        boxWidth = min(36, boxWidth)
+        stack.spacing = spacing
+        let fontSize = min(22, max(12, boxWidth * 0.62))
         boxViews = chars.enumerated().map { index, ch in
-            let box = makeBox()
+            let box = makeBox(fontSize: fontSize)
             box.tag = index
             if ch != "_", let label = box.viewWithTag(100) as? UILabel {
                 label.text = ch.uppercased()
@@ -136,7 +147,7 @@ final class SpellingInputView: UIView, UITextFieldDelegate {
             box.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(boxTapped(_:))))
             stack.addArrangedSubview(box)
             NSLayoutConstraint.activate([
-                box.widthAnchor.constraint(equalToConstant: 36),
+                box.widthAnchor.constraint(equalToConstant: boxWidth),
                 box.heightAnchor.constraint(equalToConstant: 44)
             ])
             return box
@@ -158,7 +169,7 @@ final class SpellingInputView: UIView, UITextFieldDelegate {
         activate()
     }
 
-    private func makeBox() -> UIView {
+    private func makeBox(fontSize: CGFloat) -> UIView {
         let box = UIView()
         box.backgroundColor = .quaternarySystemFill.withAlphaComponent(0.15)
         box.layer.cornerRadius = 8
@@ -166,8 +177,7 @@ final class SpellingInputView: UIView, UITextFieldDelegate {
         box.layer.borderColor = UIColor.separator.cgColor
 
         let label = UILabel()
-        label.font = .preferredFont(forTextStyle: .title2)
-        label.font = .systemFont(ofSize: label.font.pointSize, weight: .bold)
+        label.font = .systemFont(ofSize: fontSize, weight: .bold)
         label.isHidden = true
         label.tag = 100
         box.addSubview(label)