1、安装&截图：

brew install libimobiledevice
brew install ideviceinstaller

然后连接 iPhone 手机到电脑，尝试执行截图命令时，报错：

~ % idevicescreenshot
Could not start screenshotr service! Remember that you have to mount the Developer disk image on your device if you want to use the screenshotr service.

2.解决方法：

打开 Xcode，新建任意 app 项目，然后选择你的手机，run 一下。再次截图，即可

~ % idevicescreenshot
Could not start screenshotr service! Remember that you have to mount the Developer disk image on your device if you want to use the screenshotr service.

~ % idevicescreenshot
Screenshot saved to screenshot-2021-07-27-12-55-04.png