diff --git a/README.md b/README.md
index dcec36c3..eabd8cbf 100644
--- a/README.md
+++ b/README.md
@@ -57,7 +57,8 @@ flutter优点主要包括：
 
 ### app 预览
 
-<img src="https://img.alicdn.com/tfs/TB1MoiNExTpK1RjSZFGXXcHqFXa-362-751.gif" width=200> <img src="https://img.alicdn.com/tfs/TB1oeicBhjaK1RjSZFAXXbdLFXa-345-717.gif" width=200>  <img src="https://img.alicdn.com/tfs/TB13Xh3BkvoK1RjSZFNXXcxMVXa-345-717.gif" width=200>  <img src="https://img.alicdn.com/tfs/TB1MtdSBjDpK1RjSZFrXXa78VXa-345-717.gif" width=200>
+
+<img src="https://img.alicdn.com/tfs/TB1MoiNExTpK1RjSZFGXXcHqFXa-362-751.gif" width=200> <img src="https://img.alicdn.com/tfs/TB1oeicBhjaK1RjSZFAXXbdLFXa-345-717.gif" width=200>  <img src="https://img.alicdn.com/tfs/TB1WJNuBmzqK1RjSZPcXXbTepXa-345-717.gif" width=200>  <img src="https://img.alicdn.com/tfs/TB13Xh3BkvoK1RjSZFNXXcxMVXa-345-717.gif" width=200>  
 
 ### Core Team
 
diff --git a/ios/Runner.xcodeproj/project.pbxproj b/ios/Runner.xcodeproj/project.pbxproj
index 7d983e51..b7900b96 100644
--- a/ios/Runner.xcodeproj/project.pbxproj
+++ b/ios/Runner.xcodeproj/project.pbxproj
@@ -9,9 +9,9 @@
 /* Begin PBXBuildFile section */
 		084A20882202E4FD00428FF5 /* flutter go.png in Resources */ = {isa = PBXBuildFile; fileRef = 084A20872202E4FD00428FF5 /* flutter go.png */; };
 		1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */ = {isa = PBXBuildFile; fileRef = 1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */; };
-		2D5378261FAA1A9400D5DBA9 /* flutter_assets in Resources */ = {isa = PBXBuildFile; fileRef = 2D5378251FAA1A9400D5DBA9 /* flutter_assets */; };
 		333E5DAE7FC10AC69FEC26C0 /* libPods-Runner.a in Frameworks */ = {isa = PBXBuildFile; fileRef = DDA792F029EDD7A11295D192 /* libPods-Runner.a */; };
 		3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */; };
+		2D5378261FAA1A9400D5DBA9 /* flutter_assets in Resources */ = {isa = PBXBuildFile; fileRef = 2D5378251FAA1A9400D5DBA9 /* flutter_assets */; };
 		3B80C3941E831B6300D905FE /* App.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 3B80C3931E831B6300D905FE /* App.framework */; };
 		3B80C3951E831B6300D905FE /* App.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 3B80C3931E831B6300D905FE /* App.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		9705A1C61CF904A100538489 /* Flutter.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 9740EEBA1CF902C7004384FC /* Flutter.framework */; };
@@ -42,8 +42,8 @@
 		084A20872202E4FD00428FF5 /* flutter go.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = "flutter go.png"; sourceTree = "<group>"; };
 		1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = "<group>"; };
 		1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GeneratedPluginRegistrant.m; sourceTree = "<group>"; };
-		2D5378251FAA1A9400D5DBA9 /* flutter_assets */ = {isa = PBXFileReference; lastKnownFileType = folder; name = flutter_assets; path = Flutter/flutter_assets; sourceTree = SOURCE_ROOT; };
 		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
+		2D5378251FAA1A9400D5DBA9 /* flutter_assets */ = {isa = PBXFileReference; lastKnownFileType = folder; name = flutter_assets; path = Flutter/flutter_assets; sourceTree = SOURCE_ROOT; };
 		3B80C3931E831B6300D905FE /* App.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = App.framework; path = Flutter/App.framework; sourceTree = "<group>"; };
 		7AFA3C8E1D35360C0083082E /* Release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = Release.xcconfig; path = Flutter/Release.xcconfig; sourceTree = "<group>"; };
 		7AFFD8ED1D35381100E5BB4D /* AppDelegate.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = AppDelegate.h; sourceTree = "<group>"; };
@@ -94,6 +94,7 @@
 			children = (
 				3B80C3931E831B6300D905FE /* App.framework */,
 				3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */,
+				2D5378251FAA1A9400D5DBA9 /* flutter_assets */,
 				9740EEBA1CF902C7004384FC /* Flutter.framework */,
 				9740EEB21CF90195004384FC /* Debug.xcconfig */,
 				7AFA3C8E1D35360C0083082E /* Release.xcconfig */,
@@ -211,6 +212,7 @@
 			files = (
 				97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */,
 				3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */,
+				2D5378261FAA1A9400D5DBA9 /* flutter_assets in Resources */,
 				084A20882202E4FD00428FF5 /* flutter go.png in Resources */,
 				97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */,
 				97C146FC1CF9000F007C117D /* Main.storyboard in Resources */,
diff --git a/lib/utils/shared_preferences.dart b/lib/utils/shared_preferences.dart
index 9dee93d4..6d3fc27e 100644
--- a/lib/utils/shared_preferences.dart
+++ b/lib/utils/shared_preferences.dart
@@ -2,7 +2,7 @@
 import 'dart:async';
 import 'package:shared_preferences/shared_preferences.dart';
 export 'package:flutter_go/resources/shared_preferences_keys.dart';
-///
+
 /// 用来做shared_preferences的存储
 class SpUtil {
   static SpUtil _instance;
@@ -20,7 +20,6 @@ class SpUtil {
   }
 
   static Future<SpUtil> getInstance() async  {
-    print("_instance>>$_instance");
     if (_instance == null) {
       _instance = new SpUtil._();
       await _instance._init();