보통 앱을 시작할 때 해당 회사의 로고가 대략 2, 3초 동안 보이고 앱이 시작된다 이를 splash 화면이라고 한다.

이를 적용해보자.

1. library 다운

1. flutter_native_splash
2. after_layout

2. flutter_native_splash.yaml 파일 생성

프로젝트 root에 커서를 놓고 적용시켜주면 된다. 참고로 flutter_native_splash.yaml 은 약 100줄 정도 되는데 구글해도 되고 제일 아래 작성해 두겠다.

flutter pub run flutter_native_splash:create --path=flutter_native_splash.yaml

후에 해당 splash 이미지를 바꾸었거나 수정하였다면 아래 명령어를 통해 해당 ymal 파일을 재적용시켜주면 된다.

flutter pub run flutter_native_splash:remove
flutter pub run flutter_native_splash:create --path=flutter_native_splash.yaml

3. 코드 작성

이제 App 의 시작점에 시작 전에 Splash 이미지를 보여줄 수 있도록 하고,

Future<void> main() async {
  WidgetsBinding widgetsBinding = WidgetsFlutterBinding.ensureInitialized();
  FlutterNativeSplash.preserve(widgetsBinding: widgetsBinding);
  runApp(MyApp());
}

앞서 받은 AfterLayoutMixin 을 통하여 Flutter의 위젯 빌드 후 레이아웃 정보를 넘겨주는 함수에서 해당 Splash 화면을 지워주면 된다.

// 생략

class MyAppState extends State<MainScreen> with AfterLayoutMixin {
    
    // 생략
    
    @override
  	FutureOr<void> afterFirstLayout(BuildContext context) async {
    	// 추후 로그인 혹은 resource 를 불러오는 작업을 여기에 추가.
    	FlutterNativeSplash.remove();
  	}
    
    // 생략

참고. flutter_native_splash.yaml 파일

flutter_native_splash:
  # This package generates native code to customize Flutter's default white native splash screen
  # with background color and splash image.
  # Customize the parameters below, and run the following command in the terminal:
  # flutter pub run flutter_native_splash:create
  # To restore Flutter's default white splash screen, run the following command in the terminal:
  # flutter pub run flutter_native_splash:remove

  # color or background_image is the only required parameter.  Use color to set the background
  # of your splash screen to a solid color.  Use background_image to set the background of your
  # splash screen to a png image.  This is useful for gradients. The image will be stretch to the
  # size of the app. Only one parameter can be used, color and background_image cannot both be set.
  color: "#0a0a0e"
  #background_image: "assets/background.png"

  # Optional parameters are listed below.  To enable a parameter, uncomment the line by removing
  # the leading # character.

  # The image parameter allows you to specify an image used in the splash screen.  It must be a
  # png file and should be sized for 4x pixel density.
  image: assets/image/splash/splash.png

  # The branding property allows you to specify an image used as branding in the splash screen.
  # It must be a png file. It is supported for Android, iOS and the Web.  For Android 12,
  # see the Android 12 section below.
  #branding: assets/dart.png

  # To position the branding image at the bottom of the screen you can use bottom, bottomRight,
  # and bottomLeft. The default values is bottom if not specified or specified something else.
  #branding_mode: bottom

  # The color_dark, background_image_dark, image_dark, branding_dark are parameters that set the background
  # and image when the device is in dark mode. If they are not specified, the app will use the
  # parameters from above. If the image_dark parameter is specified, color_dark or
  # background_image_dark must be specified.  color_dark and background_image_dark cannot both be
  # set.
  #color_dark: "#042a49"
  #background_image_dark: "assets/dark-background.png"
  #image_dark: assets/splash-invert.png
  #branding_dark: assets/dart_dark.png

  # Android 12 handles the splash screen differently than previous versions.  Please visit
  # https://developer.android.com/guide/topics/ui/splash-screen
  # Following are Android 12 specific parameter.
  android_12:
  # The image parameter sets the splash screen icon image.  If this parameter is not specified,
  # the app's launcher icon will be used instead.
  # Please note that the splash screen will be clipped to a circle on the center of the screen.
  # App icon with an icon background: This should be 960×960 pixels, and fit within a circle
  # 640 pixels in diameter.
  # App icon without an icon background: This should be 1152×1152 pixels, and fit within a circle
  # 768 pixels in diameter.
    image: assets/image/splash/android12.png

  # Splash screen background color.
    color: "#0a0a0e"

  # App icon background color.
  #icon_background_color: "#111111"

  # The branding property allows you to specify an image used as branding in the splash screen.
  #branding: assets/dart.png

  # The image_dark, color_dark, icon_background_color_dark, and branding_dark set values that
  # apply when the device is in dark mode. If they are not specified, the app will use the
  # parameters from above.
  #image_dark: assets/android12splash-invert.png
  #color_dark: "#042a49"
  #icon_background_color_dark: "#eeeeee"

  # The android, ios and web parameters can be used to disable generating a splash screen on a given
  # platform.
  #android: false
  #ios: false
  #web: false

  # Platform specific images can be specified with the following parameters, which will override
  # the respective parameter.  You may specify all, selected, or none of these parameters:
  #color_android: "#42a5f5"
  #color_dark_android: "#042a49"
  #color_ios: "#42a5f5"
  #color_dark_ios: "#042a49"
  #color_web: "#42a5f5"
  #color_dark_web: "#042a49"
  #image_android: assets/splash-android.png
  #image_dark_android: assets/splash-invert-android.png
  #image_ios: assets/splash-ios.png
  #image_dark_ios: assets/splash-invert-ios.png
  #image_web: assets/splash-web.png
  #image_dark_web: assets/splash-invert-web.png
  #background_image_android: "assets/background-android.png"
  #background_image_dark_android: "assets/dark-background-android.png"
  #background_image_ios: "assets/background-ios.png"
  #background_image_dark_ios: "assets/dark-background-ios.png"
  #background_image_web: "assets/background-web.png"
  #background_image_dark_web: "assets/dark-background-web.png"
  #branding_android: assets/brand-android.png
  #branding_dark_android: assets/dart_dark-android.png
  #branding_ios: assets/brand-ios.png
  #branding_dark_ios: assets/dart_dark-ios.png

  # The position of the splash image can be set with android_gravity, ios_content_mode, and
  # web_image_mode parameters.  All default to center.
  #
  # android_gravity can be one of the following Android Gravity (see
  # https://developer.android.com/reference/android/view/Gravity): bottom, center,
  # center_horizontal, center_vertical, clip_horizontal, clip_vertical, end, fill, fill_horizontal,
  # fill_vertical, left, right, start, or top.
  #android_gravity: center
  #
  # ios_content_mode can be one of the following iOS UIView.ContentMode (see
  # https://developer.apple.com/documentation/uikit/uiview/contentmode): scaleToFill,
  # scaleAspectFit, scaleAspectFill, center, top, bottom, left, right, topLeft, topRight,
  # bottomLeft, or bottomRight.
  #ios_content_mode: center
  #
  # web_image_mode can be one of the following modes: center, contain, stretch, and cover.
  #web_image_mode: center

  # The screen orientation can be set in Android with the android_screen_orientation parameter.
  # Valid parameters can be found here:
  # https://developer.android.com/guide/topics/manifest/activity-element#screen
  #android_screen_orientation: sensorLandscape

  # To hide the notification bar, use the fullscreen parameter.  Has no effect in web since web
  # has no notification bar.  Defaults to false.
  # NOTE: Unlike Android, iOS will not automatically show the notification bar when the app loads.
  #       To show the notification bar, add the following code to your Flutter app:
  #       WidgetsFlutterBinding.ensureInitialized();
  #       SystemChrome.setEnabledSystemUIOverlays([SystemUiOverlay.bottom, SystemUiOverlay.top]);
  #fullscreen: true

  # If you have changed the name(s) of your info.plist file(s), you can specify the filename(s)
  # with the info_plist_files parameter.  Remove only the # characters in the three lines below,
  # do not remove any spaces:
  #info_plist_files:
  #  - 'ios/Runner/Info-Debug.plist'
  #  - 'ios/Runner/Info-Release.plist'