You must sign up for a free account on http://back4app.com in order to create a App on back{4}app, grab its App and Client Keys and paste them the Configs.swift file of this app.

back{4}app service offers the following FREE features for the STARTER pack:
• 1 GB Database Storage
• 5 GB File Storage
• 10 Requests/second
• 50 K Requests/month
• 1 Cloud Code Job

Check out its PRICING tables here: https://www.back4app.com/pricing/

Here you can find DOCS: http://docs.back4app.com/

1. Select a Navigation Controller in the Storyboard, then open the Document Outline panel (if it’s not already open). Check this picture: http://s18.postimg.org/wip2yc7y1/sample.jpg
2. Select Navigation Bar item in the list, then the icon of the Attributes Inspector panel on the right
3. Edit Bar Tint, Title Font and Title Color as you wish

That’s a bug of Xcode 8 with macOS Sierra, check this sample video to see how to fix it: https://youtu.be/z2LemT1_LqA