Splash Screen 개발 (Asset, Stateless, Widget, Column, HexCode)

초기작업

해당 경로에 png 로고 파일을 넣는다.
/Users/zeus/Desktop/splash/asset/img/logo.png
asset 폴더를 추가한것으로 알수 있는데, 여기에 그냥 로고만 넣게 된다면 플러터는 이 파일을 찾지 못할 수 있다.

‘pubspec.yaml’ 파일을 손을 봐줘야 한다.

/Users/zeus/Desktop/splash/pubspec.yaml

name: glory
description: A new Flutter project.
# The following line prevents the package from being accidentally published to
# pub.dev using `flutter pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at <https://developer.android.com/studio/publish/versioning>
# In iOS, build-name is used as CFBundleShortVersionString while build-number is used as CFBundleVersion.
# Read more about iOS versioning at
# <https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html>
# In Windows, build-name is used as the major, minor, and patch parts
# of the product and file versions while build-number is used as the build suffix.
version: 1.0.0+1

environment:
  sdk: '>=2.19.4 <3.0.0'

# Dependencies specify other packages that your package needs in order to work.
# To automatically upgrade your package dependencies to the latest versions
# consider running `flutter pub upgrade --major-versions`. Alternatively,
# dependencies can be manually updated by changing the version numbers below to
# the latest version available on pub.dev. To see which dependencies have newer
# versions available, run `flutter pub outdated`.
dependencies:
  flutter:
    sdk: flutter

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.2

dev_dependencies:
  flutter_test:
    sdk: flutter

  # The "flutter_lints" package below contains a set of recommended lints to
  # encourage good coding practices. The lint set provided by the package is
  # activated in the `analysis_options.yaml` file located at the root of your
  # package. See that file for information about deactivating specific lint
  # rules and activating additional ones.
  flutter_lints: ^2.0.0

# For information on the generic Dart part of this file, see the
# following page: <https://dart.dev/tools/pub/pubspec>

# The following section is specific to Flutter packages.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  assets: #230321_0937: img 안에 있는 모든 파일을 에셋으로 활용하는 명령어다.
    - asset/img/ #230321_0937: img 안에 있는 모든 파일을 에셋으로 활용하는 명령어다.

  # To add assets to your application, add an assets section, like this:
  # assets:
  #   - images/a_dot_burr.jpeg
  #   - images/a_dot_ham.jpeg

  # An image asset can refer to one or more resolution-specific "variants", see
  # <https://flutter.dev/assets-and-images/#resolution-aware>

  # For details regarding adding assets from package dependencies, see
  # <https://flutter.dev/assets-and-images/#from-packages>

  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "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:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see <https://flutter.dev/custom-fonts/#from-packages>

해당 야믈파일을 수정했다면 꼭 오른쪽 상단에 pub get 명령어를 입력해서 반영해야한다.

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/Users/zeus/Desktop/splash/lib/main.dart

Stateless Widget 사용 방법

import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      home: HomeScreen(),
    ),
  );
}

class HomeScreen extends StatelessWidget {
  @override //빌드 함수를 무조건 오버라이디을 해줘야지 HomeScreen에 부분에 빨간 글씨가 안생긴다
  Widget build(BuildContext context) {
      return Scaffold(
          body: Center(
              child: Text(
                  'Hello World'
              ),
          ),
      );
  }
}

상기 코드로 작성하면 핫 리스타트만 써서 초기화 했지만 핫 리로드도 되도록 세팅할 수 있다.
코드 정렬하는 명령어는 다음처럼 세팅하면 된다.

화면에 간단하게 사진 띄우기

import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      home: HomeScreen(),
    ),
  );
}

class HomeScreen extends StatelessWidget {
  @override //빌드 함수를 무조건 오버라이디을 해줘야지 HomeScreen에 부분에 빨간 글씨가 안생긴다
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Image.asset('asset/img/logo.png'), // 230321_1255 : 이미지 출력 문
      ),
    );
  }
}

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