确认按钮改用 iOS 26 原生 Liquid Glass API

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

LearnEnglish/LearnEnglish/Views/SpellingInputView.swift

@@ -61,27 +61,16 @@ final class SpellingInputView: UIView, UITextFieldDelegate {
         accessory.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 52)
         accessory.backgroundColor = .clear
 
-        let glassButton = UIButton(type: .custom)
-        glassButton.layer.cornerRadius = 14
-        glassButton.layer.borderWidth = 0.5
-        glassButton.layer.borderColor = UIColor(white: 1, alpha: 0.6).cgColor
-        glassButton.clipsToBounds = true
-
-        let renderer = UIGraphicsImageRenderer(size: CGSize(width: 60, height: 44))
-        let bgImage = renderer.image { ctx in
-            let gradient = CGGradient(
-                colorsSpace: CGColorSpaceCreateDeviceRGB(),
-                colors: [UIColor(red: 0.6, green: 0.75, blue: 0.95, alpha: 0.7).cgColor, UIColor(red: 0.3, green: 0.55, blue: 0.85, alpha: 0.45).cgColor] as CFArray,
-                locations: [0, 0.5]
-            )!
-            ctx.cgContext.drawLinearGradient(gradient,
-                start: CGPoint(x: 0, y: 0), end: CGPoint(x: 0, y: 44), options: [])
+        var glassConfig = UIButton.Configuration.glass()
+        glassConfig.title = "确认"
+        glassConfig.cornerStyle = .fixed
+        glassConfig.baseForegroundColor = .white
+        glassConfig.titleTextAttributesTransformer = UIConfigurationTextAttributesTransformer { incoming in
+            var outgoing = incoming
+            outgoing.font = .systemFont(ofSize: 16, weight: .semibold)
+            return outgoing
         }
-        glassButton.setBackgroundImage(bgImage, for: .normal)
-
-        glassButton.setTitle("确认", for: .normal)
-        glassButton.setTitleColor(.white, for: .normal)
-        glassButton.titleLabel?.font = .systemFont(ofSize: 16, weight: .semibold)
+        let glassButton = UIButton(configuration: glassConfig)
         glassButton.addAction(UIAction { [weak self] _ in
             self?.onSubmit?()
         }, for: .touchUpInside)