Flutter开发之爬坑集合（五）

Flutter基础篇（4）-- Flutter填坑全面总结
https://www.jianshu.com/p/22675c1632dc

1.创建Flutter 工程失败，空的文件

[undefined] flutter create --ios-language objc --android-language java .
Waiting for another flutter command to release the startup lock...
Cannot create a project within the Flutter SDK. Target directory '/Users/suning/Flutter_SDK/flutter/hello' is within the Flutter SDK at '/Users/suning/Flutter_SDK/flutter'.
exit code 1
Running "flutter packages get" in uuuu...  

⚠️：Cannot create a project within the Flutter SDK. Target directory ‘’ is within the Flutter SDK at '/flutter

PS：不要将工程项目目录建在flutter_SDK目录里面。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。

2.flutter 导入新项目Target of URI doesn’t exist 'package:flutter/material.dart

path 中导入：

export PUB_HOSTED_URL=https://pub.flutter-io.cn
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn

PS:然后注意使用外网：命令行里运行：flutter packages get

3.Flutter卡在Running “flutter packages get” in XXX的解决办法

PS：把你 flutter/bin/cache/lockfile 这个东西删了。重启 VS Studio
执行一下 flutter doctor命令

4.Waiting for another flutter command to release the startup lock…等待另一个flutter命令释放启动锁

1：退出 VS Code。
2：打开 flutter 安装目录 如：…\flutter\flutter\bin\cache 删除里面的 lockfile。
3：重启打开VS Code。

原因：当你的项目异常关闭，下次启动就会出现上面的一行话，
此时需要打开 flutter/bin/cache/lockfile，删除就行了
或者直接用下面的命令：rm ./flutter/bin/cache/lockfile

5.执行brew install --HEAD usbmuxd时，总是失败：Read me http://xxx

Xcode中引入flutter
brew update
brew install --HEAD usbmuxd
brew link usbmuxd
brew install --HEAD libimobiledevice
brew install ideviceinstaller

PS：彻底删除brew软件

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)"  

在出现下图的情况时点击 y 键即可

PS：Mac 重装Homebrew
1·进入官网获取下载命令。官网：http://brew.sh/

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

重装后，继续执行 Xcode中引入flutter的 一系列操作。

6.Invalid constant value.

变量和 const 关键字冲突.将const 关键字去掉即可.

未完待续。。。