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Fluter Bootcamp Compendium of learnings

ValerianaGit💙
Flutter and iOS dev. For the love of mobile.
・4 min read

TOOLS

Articles:

TIPS

  • TO EMBED IN ANOTHER WIDGET // click on the widget you want to embed - // USE the magic light bulb, // or press option+enter (on MAC, this did not work for me, but it is supposed to work).

App History

I AM RICH / I AM POOR

-> basic layout ,

  • UI -> stateless widget intro, images folder,

MI CARD

-> advanced layout -

  • UI -> Sized box. Card, List tile, Container, column, Row, safe area , fonts,

DICEE / MAGIC 8 BALL

-> STATEFUL widget, intention actions,

  • UI -> Flutter widget outline! expanded(flex- priority)
  • Actions -> TextButton - onPressed. Functions. specify the type of properties.
  • State -> $variableName, also use Random().nextInt(6) + 1 to avoid 0

XYLOPHONE:

  • packages -> play sounds, english words
  • functions -> parameters, reusable components

QUIZZLER / DESTINY:

  • Dart -> arrays, how to create an object, initializer,
  • UI/state -> set state to update UI.
  • OOP Principles -> objects, abstraction, encapsulation, inheritance, polymorphism
  • DESTINI -> STEP BY STEP PROCESS, set background for container

BMI CALCULATOR:

  • CUSTOM WIDGETS! inspo @dribbble.com
  • Flutter -> themes -> create an app theme, WIDGET theme , GestureDetector (instead of always making it a button)
  • Dart ->class constructor, final vs const(cannot change at runtime), Enums, ternary operator,
  • Functions as first class citizens(129),
  • Navigation -> routes, Navigator
  • Navigator.push() / pop (stack) for a simple application with one single stack or
  • Map (dictionary) of routes , Navigator.pushNamed() - for more complicated applications with multiple routes

CLIMA APP:

  • Networking/ API calls --
  • Futures / Async --
  • Constants file - to keep track of constants

  • ASYNC / AWAIT ->

  • permissions for accesing a user's location

  • Widget lifecycles ->

  • Stateless widgets

    • everything runs on build. since they don't need to track state
  • Stateful widgets

    • initState -> as soon as its called - only runs once
    • build -> as soon as it is done building all the widgets - runs everytime a widget changes
    • deactivate -> stateful widget gets destroyed
  • TRY / CATCH / THROW

  • name when you import a package

  • i.e import 'package:http/http.dart' as http; -> that way, when using elements from this package,

  • you can tell at a glance you are referring to elements from this package.

  • JSON parsing

  • HTTP Networking m148

BITCOIN TICKER:

  • Futures / async / await/
  • architecture -> MVC still

  • IOS AND ANDROID FUNCTIONALITY

  • import 'dart:io' show Platform;

Widget getPicker() {
if(Platform.isIOS) {
return iOSPicker();
} else if(Platform.isAndroid) {
return androidDropDownButton();
}
}

OR RIGHT IN THE WIDGET CODE

child: Platform.isIOS ? iOSPicker() : androidDropDownButton(),

  • to find out how I got all 3 medals for this challenge, visit this link

FLASHCHAT

*DART
static properties

FLUTTER

FIREBASE
  • Authentication
  • - AUTH , FIRESTORE AND FIREBASE CORE
  • - fix first error after adding firebase - Error : running pod install becausexcode target is 8.0
  • - >> so I updated target to 12.0 in my iOS folder
  • - Now the app just hangs on running pod install
DART
  • Streams - receipt (Futures)
  • - but this time, you have a seat at a table , and you'll be able to pick up the pieces as they reach you

TODOEY

  • ChangeNotifierProvider<TaskData>(builder: (context) => TaskData(), child:
UI DESIGN
  • widget index in flutter docs to peek at whats available
state management
  • setState
  • local state - don't need it across the app

    • lift state up with calbacks
    • set state in a parent widget to update all the widgets
    • upwards/ sideways and downwards in the tree.
    • Essentially, find the parent most node of all the widgets that will inherit that state,
    • update state there, and that way state can be used downwards
Architectural patterns and design patterns m. 204
  • Architechture - manage complexity / scale
  • i.e. MVC - (also a design pattern when speaking of a single )

  • imperative (swift/ iOS) vs reactive (flutter - doesn't rely on touch events, UI is a function of the state)

  • for reactive programming we talk about STATE MANAGEMENT as opposed to design patterns

    Provider package - state management in Flutter

    https://pub.dev/packages/provider/install

  • child listens to a parent state change

  • import 'package:provider/provider.dart';

  • Keep state of taskData provider high so we can use it all the way down the tree 1 - create a TaskData Change notifier class

  • provide the data to task screen(number of tasks ), as well as task list (all Tasks) -> 2 - (listeners)

Riverpod - provider but more testable

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