实现缩放功能：增加缩放功能检索和设置方法，更新UI以支持缩放调整，增强缩放比例的状态管理。

ios/Runner/RecordingPlugin.swift

@@ -116,6 +116,7 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
   private var recordingStartedAt: Date?
   private var elapsedTimer: Timer?
   private var pendingStopResult: FlutterResult?
+  private var currentZoomRatio: CGFloat = 1.0
 
   private(set) var status = RecordingStatus(state: .idle) {
     didSet {
@@ -291,6 +292,7 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
       self.session.commitConfiguration()
       self.videoInput = nil
       self.audioInput = nil
+      self.currentZoomRatio = 1.0
       self.configured = false
       self.updateStatus(RecordingStatus(state: .idle))
 
@@ -312,6 +314,52 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
     return status.toMap()
   }
 
+  func zoomCapabilities(result: @escaping FlutterResult) {
+    sessionQueue.async { [weak self] in
+      guard let self else { return }
+      let capabilities = self.currentZoomCapabilitiesMap()
+      DispatchQueue.main.async {
+        result(capabilities)
+      }
+    }
+  }
+
+  func setZoomRatio(_ ratio: CGFloat, result: @escaping FlutterResult) {
+    sessionQueue.async { [weak self] in
+      guard let self else { return }
+      guard let device = self.videoInput?.device else {
+        self.currentZoomRatio = max(1.0, ratio)
+        let capabilities = self.currentZoomCapabilitiesMap()
+        DispatchQueue.main.async {
+          result(capabilities)
+        }
+        return
+      }
+
+      do {
+        let nextZoom = self.clampedZoomRatio(ratio, for: device)
+        try device.lockForConfiguration()
+        device.videoZoomFactor = nextZoom
+        device.unlockForConfiguration()
+        self.currentZoomRatio = nextZoom
+        let capabilities = self.currentZoomCapabilitiesMap()
+        DispatchQueue.main.async {
+          result(capabilities)
+        }
+      } catch {
+        DispatchQueue.main.async {
+          result(
+            FlutterError(
+              code: "ZOOM_FAILED",
+              message: error.localizedDescription,
+              details: nil
+            )
+          )
+        }
+      }
+    }
+  }
+
   func fileOutput(
     _ output: AVCaptureFileOutput,
     didFinishRecordingTo outputFileURL: URL,
@@ -465,9 +513,43 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
     session.commitConfiguration()
 
     configured = true
+    try applyCurrentZoom()
     try configureAudioInput(enabled: withAudio)
   }
 
+  private func currentZoomCapabilitiesMap() -> [String: Any] {
+    guard let device = videoInput?.device else {
+      return [
+        "zoomRatio": Double(currentZoomRatio),
+        "minZoomRatio": 1.0,
+        "maxZoomRatio": 3.0,
+      ]
+    }
+
+    let minZoom = device.minAvailableVideoZoomFactor
+    let maxZoom = device.maxAvailableVideoZoomFactor
+    let zoom = clampedZoomRatio(device.videoZoomFactor, for: device)
+    currentZoomRatio = zoom
+    return [
+      "zoomRatio": Double(zoom),
+      "minZoomRatio": Double(minZoom),
+      "maxZoomRatio": Double(maxZoom),
+    ]
+  }
+
+  private func applyCurrentZoom() throws {
+    guard let device = videoInput?.device else { return }
+    let nextZoom = clampedZoomRatio(currentZoomRatio, for: device)
+    try device.lockForConfiguration()
+    device.videoZoomFactor = nextZoom
+    device.unlockForConfiguration()
+    currentZoomRatio = nextZoom
+  }
+
+  private func clampedZoomRatio(_ ratio: CGFloat, for device: AVCaptureDevice) -> CGFloat {
+    min(max(ratio, device.minAvailableVideoZoomFactor), device.maxAvailableVideoZoomFactor)
+  }
+
   private func configureAudioInput(enabled: Bool) throws {
     session.beginConfiguration()
     defer { session.commitConfiguration() }
@@ -587,6 +669,12 @@ final class RecordingPlugin: NSObject, FlutterPlugin, FlutterStreamHandler {
       controller.startRecording(withAudio: withAudio, displayName: displayName, result: result)
     case "stopRecording":
       controller.stopRecording(result: result)
+    case "getZoomCapabilities":
+      controller.zoomCapabilities(result: result)
+    case "setZoomRatio":
+      let args = call.arguments as? [String: Any]
+      let ratio = args?["zoomRatio"] as? Double ?? 1.0
+      controller.setZoomRatio(CGFloat(ratio), result: result)
     case "disposePreview":
       controller.disposePreview(result: result)
     case "getStatus":