diff --git a/Bark/Assets.xcassets/baseline_filter_drama_black_24pt.imageset/Contents.json b/Bark/Assets.xcassets/baseline_filter_drama_black_24pt.imageset/Contents.json
new file mode 100644
index 0000000..483a36d
--- /dev/null
+++ b/Bark/Assets.xcassets/baseline_filter_drama_black_24pt.imageset/Contents.json
@@ -0,0 +1,26 @@
+{
+  "images" : [
+    {
+      "filename" : "baseline_filter_drama_black_24pt_1x.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "baseline_filter_drama_black_24pt_2x.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "baseline_filter_drama_black_24pt_3x.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  },
+  "properties" : {
+    "template-rendering-intent" : "template"
+  }
+}
diff --git a/Bark/Assets.xcassets/baseline_filter_drama_black_24pt.imageset/baseline_filter_drama_black_24pt_1x.png b/Bark/Assets.xcassets/baseline_filter_drama_black_24pt.imageset/baseline_filter_drama_black_24pt_1x.png
new file mode 100644
index 0000000..76723dd
Binary files /dev/null and b/Bark/Assets.xcassets/baseline_filter_drama_black_24pt.imageset/baseline_filter_drama_black_24pt_1x.png differ
diff --git a/Bark/Assets.xcassets/baseline_filter_drama_black_24pt.imageset/baseline_filter_drama_black_24pt_2x.png b/Bark/Assets.xcassets/baseline_filter_drama_black_24pt.imageset/baseline_filter_drama_black_24pt_2x.png
new file mode 100644
index 0000000..6be4e7c
Binary files /dev/null and b/Bark/Assets.xcassets/baseline_filter_drama_black_24pt.imageset/baseline_filter_drama_black_24pt_2x.png differ
diff --git a/Bark/Assets.xcassets/baseline_filter_drama_black_24pt.imageset/baseline_filter_drama_black_24pt_3x.png b/Bark/Assets.xcassets/baseline_filter_drama_black_24pt.imageset/baseline_filter_drama_black_24pt_3x.png
new file mode 100644
index 0000000..9ee4aea
Binary files /dev/null and b/Bark/Assets.xcassets/baseline_filter_drama_black_24pt.imageset/baseline_filter_drama_black_24pt_3x.png differ
diff --git a/Controller/MessageListViewController.swift b/Controller/MessageListViewController.swift
index c5e0293..c4d9455 100644
--- a/Controller/MessageListViewController.swift
+++ b/Controller/MessageListViewController.swift
@@ -59,7 +59,7 @@ class MessageListViewController: BaseViewController {
         navigationItem.searchController?.obscuresBackgroundDuringPresentation = false
         navigationItem.searchController?.delegate = self
         
-        navigationItem.setBarButtonItems(items: [UIBarButtonItem(customView: deleteButton), UIBarButtonItem(customView: groupButton)], left: false)
+        navigationItem.setBarButtonItems(items: [UIBarButtonItem(customView: deleteButton), UIBarButtonItem(customView: groupButton)], position: .right)
         
         self.view.addSubview(tableView)
         tableView.snp.makeConstraints { make in
diff --git a/View/UINavigationItem+Extension.swift b/View/UINavigationItem+Extension.swift
index 99998e9..fd6c435 100644
--- a/View/UINavigationItem+Extension.swift
+++ b/View/UINavigationItem+Extension.swift
@@ -13,16 +13,21 @@ import UIKit
 // 所以先用 一个 fixedSpace UIBarButtonItem 先把距离给缩短点，
 // 然后用个 AlignmentRectInsetsOverridable 把自己的按钮往 左/右 挪动，减少距离
 // 用 HitTestSlopable 增加点击区域
+enum UINavigationItemPosition {
+    case left
+    case right
+}
+
 extension UINavigationItem {
     func setLeftBarButtonItem(item: UIBarButtonItem) {
-        setBarButtonItems(items: [item], left: true)
+        setBarButtonItems(items: [item], position: .left)
     }
 
     func setRightBarButtonItem(item: UIBarButtonItem) {
-        setBarButtonItems(items: [item], left: false)
+        setBarButtonItems(items: [item], position: .right)
     }
 
-    func setBarButtonItems(items: [UIBarButtonItem], left: Bool) {
+    func setBarButtonItems(items: [UIBarButtonItem], position: UINavigationItemPosition) {
         guard items.count > 0 else {
             self.leftBarButtonItems = nil
             return
@@ -33,7 +38,7 @@ extension UINavigationItem {
                 guard let view = item.customView else { return }
                 item.customView?.translatesAutoresizingMaskIntoConstraints = false
                 (item.customView as? HitTestSlopable)?.hitTestSlop = UIEdgeInsets(top: -10, left: -10, bottom: -10, right: -10)
-                (item.customView as? AlignmentRectInsetsOverridable)?.alignmentRectInsetsOverride = UIEdgeInsets(top: 0, left: left ? 8 : -8, bottom: 0, right: left ? -8 : 8)
+                (item.customView as? AlignmentRectInsetsOverridable)?.alignmentRectInsetsOverride = UIEdgeInsets(top: 0, left: position == .left ? 8 : -8, bottom: 0, right: position == .left ? -8 : 8)
                 item.customView?.snp.makeConstraints { make in
                     make.width.equalTo(view.bounds.size.width > 24 ? view.bounds.width : 24)
                     make.height.equalTo(view.bounds.size.height > 24 ? view.bounds.height : 24)
@@ -46,7 +51,7 @@ extension UINavigationItem {
             spacer.width = -8
             buttonItems.insert(spacer, at: 0)
         }
-        if left {
+        if position == .left {
             self.leftBarButtonItems = buttonItems
         }
         else {