如果您在设备上运行应用程序，则可以使用新的Yosemite功能将USB记录到QuickTime。

If you were running the app on a device, you could use the new Yosemite feature to record over USB to QuickTime.

然而，当您使用模拟器时，您需要在QuickTime中进行部分屏幕录制。

However, as you are using the simulator, you will need to a partial screen recording in QuickTime.

启动QuickTime，然后转到文件>新屏幕录制。您可以单击以选择整个屏幕，也可以拖动以仅记录屏幕的一部分。

Launch QuickTime then go to File > New Screen Recording. You can either click to select the whole screen, or drag to only record a portion of the screen.

如果你想要更灵活，您需要使用第三方软件，如 ScreenFlow 。

If you want more flexibility, you will need to use 3rd party software like ScreenFlow.