feat(splash): 添加启动页背景图片和相关配置

- 在 assets.dart 中新增 app_logo.jpg 和 splash.png 图片资源
- 配置 iOS LaunchBackground.imageset 支持启动背景图
- 更新 iOS LaunchImage.imageset 文件结构和属性顺序
- 添加 flutter_native_splash.yaml 配置文件指定启动页背景
- 修改 Info.plist 添加 UIStatusBarHidden 键值
- 更新 Android 启动背景 drawable 文件引用新的 background 图片
- 调整 iOS LaunchScreen.storyboard 增加背景图约束和支持
- 在 Android styles.xml 和 styles-night.xml 中添加启动页样式配置

# Conflicts:
#	ios/Runner/Info.plist

android/app/src/main/res/drawable-v21/launch_background.xml

@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:drawable="@android:color/white" />
     <item>
-        <bitmap android:scaleType="centerCrop" android:src="@drawable/splash"/>
+        <bitmap android:gravity="fill" android:src="@drawable/background"/>
     </item>
 </layer-list>

android/app/src/main/res/drawable/launch_background.xml

@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:drawable="@android:color/white" />
     <item>
-        <bitmap android:scaleType="centerCrop" android:src="@drawable/splash"/>
+        <bitmap android:gravity="fill" android:src="@drawable/background"/>
     </item>
 </layer-list>

android/app/src/main/res/values-night/styles.xml

@@ -5,6 +5,10 @@
         <!-- Show a splash screen on the activity. Automatically removed when
              the Flutter engine draws its first frame -->
         <item name="android:windowBackground">@drawable/launch_background</item>
+        <item name="android:forceDarkAllowed">false</item>
+        <item name="android:windowFullscreen">false</item>
+        <item name="android:windowDrawsSystemBarBackgrounds">false</item>
+        <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
     </style>
     <!-- Theme applied to the Android Window as soon as the process has started.
          This theme determines the color of the Android Window while your

android/app/src/main/res/values/styles.xml

@@ -5,6 +5,10 @@
         <!-- Show a splash screen on the activity. Automatically removed when
              the Flutter engine draws its first frame -->
         <item name="android:windowBackground">@drawable/launch_background</item>
+        <item name="android:forceDarkAllowed">false</item>
+        <item name="android:windowFullscreen">false</item>
+        <item name="android:windowDrawsSystemBarBackgrounds">false</item>
+        <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
     </style>
     <!-- Theme applied to the Android Window as soon as the process has started.
          This theme determines the color of the Android Window while your

flutter_native_splash.yaml

@@ -0,0 +1,2 @@
+flutter_native_splash:
+  background_image: assets/images/splash.png

ios/Runner/Assets.xcassets/LaunchBackground.imageset/Contents.json

@@ -0,0 +1,21 @@
+{
+  "images" : [
+    {
+      "filename" : "background.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json

@@ -1,23 +1,23 @@
 {
   "images" : [
     {
-      "idiom" : "universal",
       "filename" : "LaunchImage.png",
+      "idiom" : "universal",
       "scale" : "1x"
     },
     {
-      "idiom" : "universal",
       "filename" : "LaunchImage@2x.png",
+      "idiom" : "universal",
       "scale" : "2x"
     },
     {
-      "idiom" : "universal",
       "filename" : "LaunchImage@3x.png",
+      "idiom" : "universal",
       "scale" : "3x"
     }
   ],
   "info" : {
-    "version" : 1,
-    "author" : "xcode"
+    "author" : "xcode",
+    "version" : 1
   }
 }

ios/Runner/Base.lproj/LaunchScreen.storyboard

@@ -16,13 +16,19 @@
                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
-                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" image="LaunchImage" translatesAutoresizingMaskIntoConstraints="NO" id="YRO-k0-Ey4">
-                            </imageView>
+                            <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleToFill" image="LaunchBackground" translatesAutoresizingMaskIntoConstraints="NO" id="tWc-Dq-wcI"/>
+                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" image="LaunchImage" translatesAutoresizingMaskIntoConstraints="NO" id="YRO-k0-Ey4"></imageView>
                         </subviews>
                         <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                         <constraints>
-                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerX" secondItem="Ze5-6b-2t3" secondAttribute="centerX" id="1a2-6s-vTC"/>
-                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="centerY" id="4X2-HB-R7a"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="leading" secondItem="Ze5-6b-2t3" secondAttribute="leading" id="3T2-ad-Qdv"/>
+                            <constraint firstItem="tWc-Dq-wcI" firstAttribute="bottom" secondItem="Ze5-6b-2t3" secondAttribute="bottom" id="RPx-PI-7Xg"/>
+                            <constraint firstItem="tWc-Dq-wcI" firstAttribute="top" secondItem="Ze5-6b-2t3" secondAttribute="top" id="SdS-ul-q2q"/>
+                            <constraint firstAttribute="trailing" secondItem="tWc-Dq-wcI" secondAttribute="trailing" id="Swv-Gf-Rwn"/>
+                            <constraint firstAttribute="trailing" secondItem="YRO-k0-Ey4" secondAttribute="trailing" id="TQA-XW-tRk"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="bottom" secondItem="Ze5-6b-2t3" secondAttribute="bottom" id="duK-uY-Gun"/>
+                            <constraint firstItem="tWc-Dq-wcI" firstAttribute="leading" secondItem="Ze5-6b-2t3" secondAttribute="leading" id="kV7-tw-vXt"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="top" secondItem="Ze5-6b-2t3" secondAttribute="top" id="xPn-NY-SIU"/>
                         </constraints>
                     </view>
                 </viewController>
@@ -33,5 +39,6 @@
     </scenes>
     <resources>
         <image name="LaunchImage" width="168" height="185"/>
+        <image name="LaunchBackground" width="1" height="1"/>
     </resources>
 </document>

lib/generated/assets.dart

@@ -70,6 +70,7 @@ class Assets {
   static const String imagesAd = 'assets/images/ad.png';
   static const String imagesAdd = 'assets/images/add.png';
   static const String imagesAliPay = 'assets/images/ali_pay.png';
+  static const String imagesAppLogo = 'assets/images/app_logo.jpg';
   static const String imagesArrow = 'assets/images/arrow.png';
   static const String imagesArrowForwardRight = 'assets/images/arrow_forward_right.png';
   static const String imagesArrowR = 'assets/images/arrow_r.png';
@@ -179,6 +180,7 @@ class Assets {
   static const String imagesSetting = 'assets/images/setting.png';
   static const String imagesSettingIcon = 'assets/images/setting_icon.png';
   static const String imagesShop = 'assets/images/shop.png';
+  static const String imagesSplash = 'assets/images/splash.png';
   static const String imagesSubscript = 'assets/images/subscript.png';
   static const String imagesTabChangeIcon = 'assets/images/tab_change_icon.png';
   static const String imagesTalkIcon = 'assets/images/talk_icon.png';