MotionDocs
Provides class and method documentation right in your RubyMotion REPL.
Installation
MotionDocs will only activate if running in simulator.
gem 'motion-docs'
Usage
Within your RubyMotion REPL, type in docs and a string representing what you'd like
to look up in the documentation.
(main)> docs "UINavigationController"
You'll get something like this:

To look up a method, just use the familiar notation for class and instance methods:
(main)> docs "UIColor.blueColor"
...
(main)> docs "UIColor#colorWithAlphaComponent:"
...
As an alternative, you can use .docs on a string:
(main)> "UIColor.redColor".docs
...
Or, for classes, even just on the class itself:
(main)> UIColor.docs
...
If you give it a class or instance method name, it'll give you documentation for that.
(main)> UIView.docs("#frame")
...
(main)> NSObject.docs(".alloc")
...
Support
File an issue here at Github. Better yet, submit a pull request with a fix. :-) But an issue is just fine as well.
Author
License
Copyright (c) 2015 Jamon Holmgren
MIT License
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.