保留拼写确认按钮，同时新增键盘完成键提交

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

LearnEnglish/LearnEnglish/Views/SpellingInputView.swift

@@ -3,6 +3,7 @@ import UIKit
 final class SpellingInputView: UIView, UITextFieldDelegate {
     var onChange: (() -> Void)?
     var onSubmit: (() -> Void)?
+    private(set) var confirmButton: UIButton?
 
     private let hiddenField = UITextField()
     private let stack = UIStackView()
@@ -58,6 +59,36 @@ final class SpellingInputView: UIView, UITextFieldDelegate {
         hiddenField.frame = .zero
         addSubview(hiddenField)
 
+        let accessory = UIView()
+        accessory.frame = CGRect(x: 0, y: 0, width: 0, height: 74)
+        accessory.autoresizingMask = .flexibleWidth
+        accessory.backgroundColor = .clear
+
+        var glassConfig = UIButton.Configuration.glass()
+        glassConfig.title = "确认"
+        glassConfig.cornerStyle = .fixed
+        glassConfig.background.cornerRadius = 25
+        glassConfig.baseForegroundColor = .label
+        glassConfig.titleTextAttributesTransformer = UIConfigurationTextAttributesTransformer { incoming in
+            var outgoing = incoming
+            outgoing.font = .systemFont(ofSize: 16, weight: .semibold)
+            return outgoing
+        }
+        let glassButton = UIButton(configuration: glassConfig)
+        confirmButton = glassButton
+        glassButton.addAction(UIAction { [weak self] _ in
+            self?.onSubmit?()
+        }, for: .touchUpInside)
+        glassButton.translatesAutoresizingMaskIntoConstraints = false
+        accessory.addSubview(glassButton)
+        NSLayoutConstraint.activate([
+            glassButton.trailingAnchor.constraint(equalTo: accessory.trailingAnchor, constant: -15),
+            glassButton.topAnchor.constraint(equalTo: accessory.topAnchor, constant: 12),
+            glassButton.widthAnchor.constraint(equalToConstant: 80),
+            glassButton.heightAnchor.constraint(equalToConstant: 50)
+        ])
+        hiddenField.inputAccessoryView = accessory
+
         addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(reactivate)))
     }
 
@@ -97,6 +128,11 @@ final class SpellingInputView: UIView, UITextFieldDelegate {
         refreshBoxes()
     }
 
+    func hideAccessoryView() {
+        confirmButton?.isHidden = true
+        hiddenField.inputAccessoryView = nil
+    }
+
     func showResultState(correct: Bool) {
         let color = correct ? Theme.Color.correct : Theme.Color.wrong
         for position in blankPositions {