feat(PlayerView): 改进播放器视图的UI和动态文本布局

- 更新背景颜色、阴影和边框样式
- 重构语言标签布局，添加容器视图
- 实现动态文本行数限制以适应不同高度
- 优化字体颜色和行间距

local_plugins/native_plugin/ios/Classes/PlayerView.swift

@@ -3,9 +3,14 @@ import UIKit
 public class PlayerView: UIView {
   private let titleLabel: UILabel = UILabel()
   private let langLabel: UILabel = UILabel()
+  private let langContainer: UIView = UIView()
   private let cnLabel: UILabel = UILabel()
   private let enLabel: UILabel = UILabel()
   private let stackView: UIStackView
+  private var lastDynamicTextLines: Int = -1
+  private let langRow: UIStackView = UIStackView()
+  private var lastBoundsSize: CGSize = .zero
+  private var lastLangText: String? = nil
 
   public override init(frame: CGRect) {
     stackView = UIStackView()
@@ -24,42 +29,84 @@ public class PlayerView: UIView {
   }
 
   private func setupUI() {
-    backgroundColor = .white
+    backgroundColor = UIColor(red: 40.0 / 255.0, green: 40.0 / 255.0, blue: 40.0 / 255.0, alpha: 90.0 / 255.0)
+    layer.cornerRadius = 16
+    layer.borderWidth = 1
+    layer.borderColor = UIColor(white: 1.0, alpha: 46.0 / 255.0).cgColor
+    layer.shadowColor = UIColor.black.cgColor
+    layer.shadowOpacity = 0.35
+    layer.shadowRadius = 12
+    layer.shadowOffset = CGSize(width: 0, height: 4)
 
     titleLabel.text = "实时翻译"
     titleLabel.font = .boldSystemFont(ofSize: 22)
-    titleLabel.textColor = .black
+    titleLabel.textColor = UIColor(white: 1.0, alpha: 235.0 / 255.0)
     titleLabel.textAlignment = .center
     titleLabel.numberOfLines = 1
+    titleLabel.isHidden = true
 
-    langLabel.text = "中文(简体) -> 英语"
-    langLabel.font = .systemFont(ofSize: 14)
-    langLabel.textColor = .darkGray
-    langLabel.textAlignment = .left
+    langLabel.text = "src -> tgt"
+    langLabel.font = .systemFont(ofSize: 12)
+    langLabel.textColor = UIColor(white: 1.0, alpha: 235.0 / 255.0)
+    langLabel.textAlignment = .center
     langLabel.numberOfLines = 1
+    langLabel.lineBreakMode = .byTruncatingTail
+    langLabel.translatesAutoresizingMaskIntoConstraints = false
+    langLabel.setContentHuggingPriority(.required, for: .horizontal)
+    langLabel.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
+
+    langContainer.backgroundColor = UIColor(white: 1.0, alpha: 36.0 / 255.0)
+    langContainer.layer.cornerRadius = 10
+    langContainer.translatesAutoresizingMaskIntoConstraints = false
+    langContainer.setContentHuggingPriority(.required, for: .horizontal)
+    langContainer.setContentCompressionResistancePriority(.required, for: .horizontal)
+    langContainer.addSubview(langLabel)
+    NSLayoutConstraint.activate([
+      langLabel.topAnchor.constraint(equalTo: langContainer.topAnchor, constant: 6),
+      langLabel.leadingAnchor.constraint(equalTo: langContainer.leadingAnchor, constant: 10),
+      langLabel.trailingAnchor.constraint(equalTo: langContainer.trailingAnchor, constant: -10),
+      langLabel.bottomAnchor.constraint(equalTo: langContainer.bottomAnchor, constant: -6),
+    ])
 
-    cnLabel.font = .systemFont(ofSize: 18)
-    cnLabel.textColor = .black
+    cnLabel.font = .systemFont(ofSize: 14)
+    cnLabel.textColor = UIColor(white: 1.0, alpha: 235.0 / 255.0)
     cnLabel.textAlignment = .left
     cnLabel.numberOfLines = 0
+    cnLabel.lineBreakMode = .byTruncatingTail
 
-    enLabel.font = .systemFont(ofSize: 18)
-    enLabel.textColor = UIColor(red: 0.24, green: 0.54, blue: 0.90, alpha: 1.0)
+    enLabel.font = .systemFont(ofSize: 15)
+    enLabel.textColor = UIColor(red: 144.0 / 255.0, green: 202.0 / 255.0, blue: 249.0 / 255.0, alpha: 1.0)
     enLabel.textAlignment = .left
     enLabel.numberOfLines = 0
+    enLabel.lineBreakMode = .byTruncatingTail
 
     let para = NSMutableParagraphStyle()
-    para.lineSpacing = 4
-    cnLabel.attributedText = NSAttributedString(string: "正在识别...", attributes: [.paragraphStyle: para])
-    enLabel.attributedText = NSAttributedString(string: "翻译中...", attributes: [.paragraphStyle: para])
+    para.lineSpacing = 2
+    para.lineHeightMultiple = 1.1
+    cnLabel.attributedText = NSAttributedString(string: "", attributes: [.paragraphStyle: para])
+    enLabel.attributedText = NSAttributedString(string: "", attributes: [.paragraphStyle: para])
 
     stackView.axis = .vertical
-    stackView.spacing = 12
+    stackView.spacing = 10
     stackView.alignment = .fill
     stackView.distribution = .fill
     stackView.translatesAutoresizingMaskIntoConstraints = false
     stackView.addArrangedSubview(titleLabel)
-    stackView.addArrangedSubview(langLabel)
+    langRow.axis = .horizontal
+    langRow.alignment = .fill
+    langRow.distribution = .fill
+    langRow.translatesAutoresizingMaskIntoConstraints = false
+    let leftSpacer = UIView()
+    let rightSpacer = UIView()
+    leftSpacer.translatesAutoresizingMaskIntoConstraints = false
+    rightSpacer.translatesAutoresizingMaskIntoConstraints = false
+    langRow.addArrangedSubview(leftSpacer)
+    langRow.addArrangedSubview(langContainer)
+    langRow.addArrangedSubview(rightSpacer)
+    NSLayoutConstraint.activate([
+      leftSpacer.widthAnchor.constraint(equalTo: rightSpacer.widthAnchor),
+    ])
+    stackView.addArrangedSubview(langRow)
     stackView.addArrangedSubview(cnLabel)
     stackView.addArrangedSubview(enLabel)
 
@@ -86,13 +133,61 @@ public class PlayerView: UIView {
       langLabel.text = lang
     }
     let para = NSMutableParagraphStyle()
-    para.lineSpacing = 4
+    para.lineSpacing = 2
+    para.lineHeightMultiple = 1.1
     if let cn = cn {
       cnLabel.attributedText = NSAttributedString(string: cn, attributes: [.paragraphStyle: para])
     }
     if let en = en {
       enLabel.attributedText = NSAttributedString(string: en, attributes: [.paragraphStyle: para])
     }
+    setNeedsLayout()
+  }
+
+  public override func layoutSubviews() {
+    super.layoutSubviews()
+    layer.shadowPath = UIBezierPath(roundedRect: bounds, cornerRadius: layer.cornerRadius).cgPath
+    let currentLangText = langLabel.text
+    if bounds.size != lastBoundsSize || currentLangText != lastLangText {
+      lastBoundsSize = bounds.size
+      lastLangText = currentLangText
+      updateDynamicTextLineLimit()
+    }
   }
+
+  private func updateDynamicTextLineLimit() {
+    let fittingWidth = max(0, bounds.width - layoutMargins.left - layoutMargins.right)
+    if fittingWidth <= 0 { return }
+
+    let visibleArrangedSubviews = stackView.arrangedSubviews.filter { !$0.isHidden }
+    let fixedSubviews = visibleArrangedSubviews.filter { $0 !== cnLabel && $0 !== enLabel }
+    let fixedHeight = fixedSubviews.reduce(CGFloat(0)) { partialResult, view in
+      partialResult
+        + view.systemLayoutSizeFitting(
+          CGSize(width: fittingWidth, height: UIView.layoutFittingCompressedSize.height),
+          withHorizontalFittingPriority: .required,
+          verticalFittingPriority: .fittingSizeLevel
+        ).height
     }
+    let totalSpacing = CGFloat(max(0, visibleArrangedSubviews.count - 1)) * stackView.spacing
+
+    let availableHeight =
+      bounds.height
+      - layoutMargins.top
+      - layoutMargins.bottom
+      - fixedHeight
+      - totalSpacing
+
+    let cnLineHeight = cnLabel.font.lineHeight * 1.1 + 2
+    let enLineHeight = enLabel.font.lineHeight * 1.1 + 2
+    let combinedLineHeight = cnLineHeight + enLineHeight
+
+    let perLabelLines = max(1, min(Int(availableHeight / combinedLineHeight), 6))
 
+    if perLabelLines != lastDynamicTextLines {
+      lastDynamicTextLines = perLabelLines
+      cnLabel.numberOfLines = perLabelLines
+      enLabel.numberOfLines = perLabelLines
+    }
+  }
+}