Xcode playgrounds are a delightful way to explore the Swift language -- once you get them set up.
To use this as a starting point, fork and clone the repo, cd into the directory, and:
rvm use ruby-2.2.4
gem install cocoapods
pod install
Then open the FirebasePlayground.xcworkspace and type code into experiment.playground file and it will automatically compile and execute, displaying results in the right-side panel.
It's a bit tricky to figure out how to use CocoaPods with Playgrounds, but the actual steps are straightforward:
Here are the steps to re-create this repo, using Swift 2, Xcode 7.2, OSX 10.10.5 (Yosemite):
note: cocoapods 0.39.0 has issue with Ruby 2.3 — likely fixed in the 1.0 beta, but I stuck with older ruby and released CocoaPod for this exercise.
rvm use ruby-2.2.4
gem install cocoapods
Make a new Xcode project with File > New > Project...
then add a new Empty file to your project called Podfile by selecting from the menu File > New > File… then Other > Empty)
with the following contents:
platform :ios, '8.1'
xcodeproj 'FirebasePlayground'
use_frameworks!
target :FirebasePlayground, exclusive: true do
pod 'Firebase'
end
back on the command-line:
pod install
This creates a new Xcode workspace, so we need to close the project in Xcode, then re-open Xcode with the file named something ending in .xcworkspace.
This new workspace should have both the original project and a new one called Pods. Now we can create the Playground, by selecting the menu: File > New > Playground… Then we save it in the root of our project directory, then add it to the project with the menu: File > Add Files To “ParsePlayground”
Now this code should compile:
import Firebase
import XCPlayground
XCPlaygroundPage.currentPage.needsIndefiniteExecution = true
We want to set needsIndefiniteExecution so that async commands will work.