diff --git a/Controller/SoundsViewController.swift b/Controller/SoundsViewController.swift
index 9f90242..3e54e9c 100644
--- a/Controller/SoundsViewController.swift
+++ b/Controller/SoundsViewController.swift
@@ -60,7 +60,6 @@ class SoundsViewController: BaseViewController<SoundsViewModel> {
                 }
                 return cell
             }
-            
         } titleForHeaderInSection: { dataSource, section in
             return dataSource[section].model
         } canEditRowAtIndexPath: { dataSource, indexPath in
@@ -176,7 +175,7 @@ extension SoundsViewController: UIDocumentPickerDelegate {
             let documentPicker = UIDocumentPickerViewController(forOpeningContentTypes: types)
             documentPicker.delegate = self
             documentPicker.allowsMultipleSelection = false
-            documentPicker.modalPresentationStyle = .formSheet
+            documentPicker.modalPresentationStyle = .pageSheet
             self.present(documentPicker, animated: true, completion: nil)
         } else {
             self.showSnackbar(text: "Requires iOS 14")
diff --git a/Controller/SoundsViewModel.swift b/Controller/SoundsViewModel.swift
index e61a8ab..7d7d699 100644
--- a/Controller/SoundsViewModel.swift
+++ b/Controller/SoundsViewModel.swift
@@ -34,6 +34,7 @@ class SoundsViewModel: ViewModel, ViewModelType {
         var soundSelected: Driver<SoundItem>
         /// 铃声导入
         var importSound: Driver<URL>
+        /// 删除铃声
         var soundDeleted: Driver<SoundItem>
     }
 
@@ -48,7 +49,7 @@ class SoundsViewModel: ViewModel, ViewModelType {
         var pickerFile: Driver<Void>
     }
 
-    /// 将铃声URL转换成 SoundItem
+    /// 将铃声 URL 转换成 SoundItem
     func getSounds(urls: [URL]) -> [SoundItem] {
         let urls = urls.sorted { u1, u2 -> Bool in
             u1.lastPathComponent.localizedStandardCompare(u2.lastPathComponent) == ComparisonResult.orderedAscending
@@ -92,7 +93,7 @@ class SoundsViewModel: ViewModel, ViewModelType {
             self.dependencies.soundFileStorage.deleteSound(url: model.model.url)
         }).disposed(by: rx.disposeBag)
         
-        // 铃声列表有更新，
+        // 铃声列表有更新
         let soundsListUpdated = Observable.merge(
             // 刚进页面
             Observable.just(()),