To import your project's colors and fonts directly in your Xcode project using the Sympli Handoff plugin, do the following:
Activate the plugin by clicking on the Sympli Handoff button at the top right corner of the window.
Select your project and then click on the "Summary" tab.
Click on the "Import" button.
For colors, a window with the option to copy the automated code snippet will appear. You can select in which programming language you want the code snippet. For fonts, you'll be prompted to choose which font(s) you want to import to Xcode. If the fonts are not uploaded to the Sympli Handoff project a "Missing" label will appear next to it.