兼容 IOS 端

ios/Runner/RecordingPlugin.swift

@@ -129,14 +129,30 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
   var statusListener: (([String: Any]) -> Void)?
 
   func attach(previewView: RecordingPreviewView) {
-    self.previewView = previewView
-    previewView.previewLayer.session = session
+    let bindPreview = { [weak self, weak previewView] in
+      guard let self, let previewView else { return }
+      self.previewView = previewView
+      previewView.previewLayer.session = self.session
+    }
+    if Thread.isMainThread {
+      bindPreview()
+    } else {
+      DispatchQueue.main.async(execute: bindPreview)
+    }
   }
 
   func detach(previewView: RecordingPreviewView) {
-    if self.previewView === previewView {
-      self.previewView?.previewLayer.session = nil
-      self.previewView = nil
+    let unbindPreview = { [weak self, weak previewView] in
+      guard let self, let previewView else { return }
+      if self.previewView === previewView {
+        previewView.previewLayer.session = nil
+        self.previewView = nil
+      }
+    }
+    if Thread.isMainThread {
+      unbindPreview()
+    } else {
+      DispatchQueue.main.async(execute: unbindPreview)
     }
   }