以编程方式从连接的Mac计算机获取iOS设备屏幕截图
我知道可以从iOS应用程序中的代码以编程方式获取屏幕截图，并手动从Xcode和Instruments获取屏幕截图（Instruments也会在UIAutomation测试失败期间自动截取屏幕截图）。我想要找到的是一种编程方式（在Mac上运行代码，而不是设备）从设备上截取插入到Mac上的屏幕截图。
I know it's possible to get a screenshot programatically from code in the iOS application, and to manually get screenshots from Xcode and Instruments (Instruments also automatically takes screenshots during UIAutomation test failures). What I would like to find is a programatic way (with code running on the Mac, not the device) to grab screenshots from the device onto the Mac which it is plugged into.
Xcode或Instruments中是否有API（或命令行参数）才能访问此屏幕截图功能？或者（理想情况下）与设备接口并直接获取屏幕截图，就像Xcode和Instruments一样吗？
Is there an API (or command-line parameters) into Xcode or Instruments to get access to this screenshot feature? Or (ideally) to interface to the device and get a screenshot directly, the same way that Xcode and Instruments do it?
是的，有办法。您想要安装免费的libimobiledevice库： https://github.com/benvium/libimobiledevice-macosx
Yes, there is a way. You want to install the free libimobiledevice library: https://github.com/benvium/libimobiledevice-macosx
安装后，您可以从命令行运行 idevicescreenshot ，它将保存一个TIFF文件截图到当前目录。
When it is installed, you can run idevicescreenshot from the commandline and it will save a TIFF file with a screenshot to the current directory.
参见 http://pervasivecode.blogspot.de/2012/06/take-iphone-or-ipad-screenshot-from.html