字体+倒计时

README.md

@@ -16,10 +16,19 @@ For help getting started with Flutter, view our
 samples, guidance on mobile development, and a full API reference.
 
 # 开发细节注意
+## 布局
 - scaffold home 主视图拆成函数
 - 颜色放在common里统一管理，使用class静态属性调用
 - 不同结构使用注释标识，使用end结尾结构更清楚
-
+## 导入资源和图片
 - 固定写法 assets/images/3.0x flutter自动适配几倍图
 - 在pubspec中导入资源，在commont新建assets类管理资源
-- 使用stack进行叠加，使用aligment进行对齐管理
+- 使用stack进行叠加，使用aligment进行对齐管理
+## 字体和文本设置
+- 导入字体，设置family和路径，以及不同字体对应的字重
+- text，使用style配置样式，fontsize是字体大小，height是行高，是个比值，使用具体的行高值/字体大小
+## 增加倒计时
+- 将无状态组件转成有状态组件，信息变化
+- 使用future.delayed实现倒计时，注意使用async
+- 使用三目运算符控制显示
+- 将相同组件抽出

assets/fonts/OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2020 The Poppins Project Authors (https://github.com/itfoundry/Poppins)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://openfontlicense.org
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

lib/pages/splash.dart

@@ -2,10 +2,44 @@ import 'package:flutter/material.dart';
 import '../common/app_colors.dart';
 import '../common/assets.dart';
 
-class SplashPage extends StatelessWidget {
+class SplashPage extends StatefulWidget {
   const SplashPage({Key? key}) : super(key: key);
 
-//logo
+  @override
+  State<SplashPage> createState() => _SplashPageState();
+}
+
+class _SplashPageState extends State<SplashPage> {
+  //计数变量
+  final duration = 10;
+  int number = 0;
+
+  //倒计时函数
+  Future<void> _countdown() async {
+    number = duration;
+    for (var i = 0; i < duration; i++) {
+      await Future.delayed(const Duration(seconds: 1), () {
+        // 除非 [mounted] 为 true，否则调用 [setState] 是错误的。
+        if (mounted == true) {
+          setState(() {
+            number--;
+          });
+        }
+      });
+    }
+
+    if (number == 0) {
+      print('倒计时结束 ');
+    }
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    _countdown();
+  }
+
+  //logo
   Widget _buildLogo() {
     return Stack(
       alignment: Alignment.center,
@@ -31,6 +65,20 @@ class SplashPage extends StatelessWidget {
     );
   }
 
+  //text方法抽出
+  Text _bulidText(String text) {
+    return Text(
+      text,
+      style: const TextStyle(
+        fontSize: 19,
+        fontFamily: 'Poppins',
+        fontWeight: FontWeight.bold,
+        color: Colors.white,
+        height: 22 / 19,
+      ),
+    );
+  }
+
   //主视图 拆成函数
   Widget _buildView(BuildContext context) {
     return Center(
@@ -40,11 +88,19 @@ class SplashPage extends StatelessWidget {
           //logo
           _buildLogo(),
 
+          const SizedBox(
+            height: 24,
+          ),
+
           //标题
-          const Text('Online Market'),
+          _bulidText('Online Market'),
+
+          const SizedBox(
+            height: 24,
+          ),
 
           //计数器
-          const Text('10'),
+          _bulidText(number > 0 ? '$number' : 'done'),
 
           //end
         ],

pubspec.yaml

@@ -74,7 +74,17 @@ flutter:
   # "family" key with the font family name, and a "fonts" key with a
   # list giving the asset and other descriptors for the font. For
   # example:
-  # fonts:
+  fonts:
+    - family: Poppins
+      fonts:
+        - asset: assets/fonts/Poppins-Light.ttf
+          weight: 300
+        - asset: assets/fonts/Poppins-Regular.ttf
+          weight: 400
+        - asset: assets/fonts/Poppins-Medium.ttf
+          weight: 500
+        - asset: assets/fonts/Poppins-Bold.ttf
+          weight: 700
   #   - family: Schyler
   #     fonts:
   #       - asset: fonts/Schyler-Regular.ttf