외부 라이브러리 의존성 설정해도 import 시

Target of URI doesn't exist: 'package:syncfusion_flutter_calendar/calendar.dart'

오류 발생, import 코딩 시 notification에서 /.pub-cache/hosted/pub.dev/ : persmission denied 발생

원인

pub.dev 툴 권한 없음

해결

sudo chown -R ~/.pub-cache/hosted/pub.dev

android studio로 dart 파일 작성 중 구문오류 있을 때 Red line 없음.

원인

설정 누락

해결

dart Analysis > setting > "Scrope analysis to the current package" 체크

zsh% flutter doctor -v
"    ✗ CocoaPods installed but not working.
        You appear to have CocoaPods installed but it is not working.
        This can happen if the version of Ruby that CocoaPods was installed with is different from the one being used to invoke it.
        This can usually be fixed by re-installing CocoaPods.
      To re-install see https://guides.cocoapods.org/using/getting-started.html#installation for instructions.
"

원인

cocoapods 설치 오류

해결

rvm 설치하여 해결

curl -L https://get.rvm.io | bash -r stable
export PATH=${PATH}:{rvm설치경로}
/bin/bash --login
rvm install ruby-2.6.5
rvm use ruby-2.6.5
rvm --default use 2.6.5
sudo gem install cocoapods

class _MyApp extends State<MyApp> with SingleTickerProviderStateMixin{
 TabController? _tabController;
 int _selectedTabIndex = 0;
}

@override
void initState(){
 super.initState();
 _tabContoller = TabController(length: 3, vsync: this); //컨트롤러 초기화 
 _tabController!.addListner(
     () => setState(
         ()=> _selectedTabInxex = _tabContoller!.index
         ) //setState
      ); //addListner
}

@override void dispose(){ _tabController?.dispose(); super.dispose(); }

```

3. 구현 ```dart @override Widget build(BuildContext context){ return Scaffold(

    bottomNavigationBar: SizedBox(
        height: 70,
        child: TabBar(
            controller: _tabController, //컨트롤러 맵핑
            tabs: const <Widget>[
                Tab(icon: Icon(
                            Icons.person,
                            color: Colors.gry
                            ),
                    text: "Customer",
                   ), //Tab
                Tab(icon: Icon(
                            Icons.person,
                            color: Colors.gry
                            ),
                    text: "Customer",
                   ), //Tab
            ] //<Widget>[]
         ) //TabBar
      ), //SizedBox
   ); //Scaffold

   } // build

assertThat 사용 불가

원인

자동으로 import 된 이놈 땜 시 발생

import org.junit.jupiter.api.*

해결방법

해당 import 문 삭제 하거나 그 위에 assertThat import

import org.assertj.core.api.Assertions.assertThat
import org.junit.jupiter.api.*

Flutter device daemon #1 exited (exit code 255), stderr: Unhandled exception: Exception: Flutter failed to write to a file at "/Users/user/.config/flutter/tool_state". Please ensure that the SDK and/or project is installed in a location that has read/write permissions for the current user. Try running: sudo chown -R $(whoami) /Users/user/.config/flutter/tool_state #0 throwToolExit (package:flutter_tools/src/base/common.dart:10:3) #1 _throwFileSystemException (package:flutter_tools/src/base/error_handling_io.dart:834:3) #2 _handlePosixException (package:flutter_tools/src/base/error_handling_io.dart:764:3) #3 _runSync (package:flutter_tools/src/base/error_handling_io.dart:600:7) #4 ErrorHandlingFile.writeAsStringSync (package:flutter_tools/src/base/error_handling_io.dart:266:5) #5 Config._flushValues (package:flutter_tools/src/base/config.dart:185:11) #6 Config.setValue (package:flutter_tools/src/base/config.dart:174:5) #7 _DefaultPersistentToolState.setIsRunningOnBot (package:flutter_tools/src/persistent_tool_state.dart:136:13) #8 BotDetector.isRunningOnBot (package:flutter_tools/src/base/bot_detector.dart:40:28) #9 isRunningOnBot (package:flutter_tools/src/globals.dart:89:48) #10 runInContext.runnerWrapper (package:flutter_tools/src/context_runner.dart:80:34) #11 AppContext.run. (package:flutter_tools/src/base/context.dart:150:29) #12 _rootRun (dart:async/zone.dart:1399:13) #13 _CustomZone.run (dart:async/zone.dart:1301:19) #14 _runZoned (dart:async/zone.dart:1804:10) #15 runZoned (dart:async/zone.dart:1747:10) #16 AppContext.run (package:flutter_tools/src/base/context.dart:149:12) #17 runInContext (package:flutter_tools/src/context_runner.dart:84:18) #18 run (package:flutter_tools/runner.dart:49:10) #19 main (package:flutter_tools/executable.dart:91:16) #20 main (file:///Users/dean/dev/tools/flutter/packages/flutter_tools/bin/flutter_tools.dart:8:14) #21 _delayEntrypointInvocation. (dart:isolate-patch/isolate_patch.dart:294:33) #22 _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:189:12)

원인

파일시스템 권한 문제.

해결

소유권 변경

sudo chown -R dean /Users/user/.config/flutter

++ 추가적으로 flutter 설치 경로 내 모든 파일 및 아래 명령어 실행 시 permission 관련 오류 일으키는 경로 모두 소유권 변경 해버림

/Users/dean/dev/tools/flutter/bin/flutter run -d chrome