flutter安装和运行

1.创建flutter工程目录（各项目+flutter目录），在flutter 目录下载flutter SDK

git init
git clone -b dev https://github.com/flutter/flutter.git

2.进入flutter SDK目录即flutter禁用通过 Google Analytics 发送数据

cd flutter
./bin/flutter config --no-analytics

禁用通过 Google Analytics 发送相关数据，以免国内网络连接失败问题。

3.检查flutter安装情况：flutter doctor

ksnowlvdeMacBook-Pro:flutter ksnowlv$ ./bin/flutter doctor
Downloading Material fonts...                                       0.7s
Downloading android-arm-profile/darwin-x64 tools...                 1.3s
Downloading android-arm-release/darwin-x64 tools...                 1.2s
Downloading android-arm64-profile/darwin-x64 tools...               1.4s
Downloading android-arm64-release/darwin-x64 tools...               1.4s
Downloading android-x86 tools...                                    6.6s
Downloading android-x64 tools...                                    6.8s
Downloading android-arm tools...                                    3.1s
Downloading android-arm-profile tools...                            2.0s
Downloading android-arm-release tools...                            1.5s
Downloading android-arm64 tools...                                  3.2s
Downloading android-arm64-profile tools...                          2.1s
Downloading android-arm64-release tools...                          1.5s
Downloading ios tools...                                           16.0s
Downloading ios-profile tools...                                   11.7s
Downloading ios-release tools...                                    8.9s
Downloading Gradle Wrapper...                                       0.3s
Downloading package sky_engine...                                   1.1s
Downloading common tools...                                         4.2s
Downloading common tools...                                         4.1s
Downloading darwin-x64 tools...                                    14.0s
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel dev, v1.6.0, on Mac OS X 10.14.4 18E226, locale zh-Hans-CN)
[!] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    ✗ Android license status unknown.
      Try re-installing or updating your Android SDK Manager.
      See https://developer.android.com/studio/#downloads or visit https://flutter.dev/setup/#android-setup for detailed instructions.
[!] iOS toolchain - develop for iOS devices
    ✗ Xcode installation is incomplete; a full installation is necessary for iOS development.
      Download at: https://developer.apple.com/xcode/download/
      Or install Xcode via the App Store.
      Once installed, run:
        sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
    ✗ libimobiledevice and ideviceinstaller are not installed. To install with Brew, run:
        brew update
        brew install --HEAD usbmuxd
        brew link usbmuxd
        brew install --HEAD libimobiledevice
        brew install ideviceinstaller
    ✗ ios-deploy not installed. To install:
        brew install ios-deploy
[!] Android Studio (version 3.4)
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
[!] Connected device
    ! No devices available

! Doctor found issues in 4 categories.

4.安装XCode和打开iOS模拟器

• 安装Xcode
  • 我机器安装的XCode版本是10.2.1，比较新了。如果安装的版本较老，可以更新下

        ksnowlvdeMacBook-Pro:flutter ksnowlv$ sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
                Password:

• 打开模拟器
  • 在Mac机器上，可以通过 open -a Simulator

5.创建工程

使用flutter create 项目名称创建项目

在使用 flutter create命令创建flutter工程时，如果报Cannot create a project within the Flutter SDK. Target directory '/Users/ksnowlv/Music/flutter/flutter/my_app' is within the Flutter SDK at '/Users/ksnowlv/Music/flutter/flutter'的错误，注意不要在flutter SDK目录及子目录下创建工程，可考虑在其它目录下创建工程。例如平级目录

6.运行工程

使用flutter run运行app

flutter-run_cmd.png

运行效果如下：

flutter-run_iOS.png