复工复产进行时，如何打好防疫战？战疫必胜
疫情突袭，让我们措手不及。来势汹汹的疫情给经济社会带来重大的冲击。因此，对于众多企业而言，如何化危机为基于，有序恢复生产，成为目前的一大挑战。
一、报错信息：
ERROR: Could not connect to lockdownd, error code -17
找不到模拟器或真机设备。这个问题应该是flutter SDK更新后引起的。
解决方法：修改lockdown文件夹的读写权限
读写权限
1点击屏幕空白位置
或者finder(访达)>前往>前往文件夹>输入/var/db/找到的lockdown文件>快捷显示简介>点击底部共享与权限>点击右下角的锁输入密码解锁>点击共享与权限下面的加号，将自己的帐户添加到权限列表中，修改为读与写>最后锁定权限即可。
2接下来依次在终端执行下方命令
brew update
brew uninstall –ignore-dependencies libimobiledevice
brew uninstall –ignore-dependencies usbmuxd
brew install –HEAD usbmuxd
brew unlink usbmuxd
brew link usbmuxd
brew install –HEAD libimobiledevice
brew install ideviceinstaller
执行brew install –HEAD libimobiledevice命令报错：
Error: An exception occurred within a child process:
DownloadError: Failed to download resource “libimobiledevice”
Failure while executing; `git clone –branch master https://git.libimobiledevice.org/libimobiledevice.git /Users/huanghaipo/Library/Caches/Homebrew/libimobiledevice–git` exited with 128. Here’s the output:
Cloning into ‘/Users/huanghaipo/Library/Caches/Homebrew/libimobiledevice–git’…
fatal: unable to access ‘https://git.libimobiledevice.org/libimobiledevice.git/’: Failed to connect to git.libimobiledevice.org port 443: Operation timed out
解决方法：
科学上网软件，但是还是报错。但是第三次去执行brew install –HEAD libimobiledevice命令成功了。当时科学上网软件在打开着，很有可能是网速的问题。或者说多执行一次这个命令。
Error: An exception occurred within a child process:
DownloadError: Failed to download resource “libimobiledevice”
Failure while executing; `git clone –branch master https://git.libimobiledevice.org/libimobiledevice.git /Users/huanghaipo/Library/Caches/Homebrew/libimobiledevice–git` exited with 128. Here’s the output:
Cloning into ‘/Users/huanghaipo/Library/Caches/Homebrew/libimobiledevice–git’…
error: RPC failed; curl 18 transfer closed with outstanding read data remaining
fatal: the remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
最后执行flutter doctor命令检测，成功找到设备。
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