Update podspec for realm and 2.2.0

Charts.podspec

@@ -8,5 +8,16 @@ Pod::Spec.new do |s|
   s.ios.deployment_target = "8.0"
   s.tvos.deployment_target = "9.0"
   s.source = { :git => "https://github.com/danielgindi/ios-charts.git", :tag => "v#{s.version}" }
-  s.source_files = "Classes", "Charts/Classes/**/*.swift"
+  s.default_subspec = "Core"
+
+  s.subspec "Core" do |ss|
+    ss.source_files  = "Charts/Classes/**/*.swift"
+    ss.exclude_files = "Charts/Classes/**/{Realm}*.swift"
+  end
+
+  s.subspec "Realm" do |ss|
+    ss.source_files  = "Charts/Classes/**/{Realm}*.swift"
+    ss.dependency "Charts/Core"
+    ss.dependency "RealmSwift", "~> 0.97"
+  end
 end

Gemfile

@@ -2,3 +2,4 @@ source "https://rubygems.org"
 
 gem "rake"
 gem "xcpretty"
+gem "cocoapods"

Gemfile.lock

@@ -1,15 +1,67 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    rake (10.4.2)
+    activesupport (4.2.5.1)
+      i18n (~> 0.7)
+      json (~> 1.7, >= 1.7.7)
+      minitest (~> 5.1)
+      thread_safe (~> 0.3, >= 0.3.4)
+      tzinfo (~> 1.1)
+    claide (0.9.1)
+    cocoapods (0.39.0)
+      activesupport (>= 4.0.2)
+      claide (~> 0.9.1)
+      cocoapods-core (= 0.39.0)
+      cocoapods-downloader (~> 0.9.3)
+      cocoapods-plugins (~> 0.4.2)
+      cocoapods-search (~> 0.1.0)
+      cocoapods-stats (~> 0.6.2)
+      cocoapods-trunk (~> 0.6.4)
+      cocoapods-try (~> 0.5.1)
+      colored (~> 1.2)
+      escape (~> 0.0.4)
+      molinillo (~> 0.4.0)
+      nap (~> 1.0)
+      xcodeproj (~> 0.28.2)
+    cocoapods-core (0.39.0)
+      activesupport (>= 4.0.2)
+      fuzzy_match (~> 2.0.4)
+      nap (~> 1.0)
+    cocoapods-downloader (0.9.3)
+    cocoapods-plugins (0.4.2)
+      nap
+    cocoapods-search (0.1.0)
+    cocoapods-stats (0.6.2)
+    cocoapods-trunk (0.6.4)
+      nap (>= 0.8, < 2.0)
+      netrc (= 0.7.8)
+    cocoapods-try (0.5.1)
+    colored (1.2)
+    escape (0.0.4)
+    fuzzy_match (2.0.4)
+    i18n (0.7.0)
+    json (1.8.3)
+    minitest (5.8.4)
+    molinillo (0.4.1)
+    nap (1.1.0)
+    netrc (0.7.8)
+    rake (10.5.0)
     rouge (1.10.1)
+    thread_safe (0.3.5)
+    tzinfo (1.2.2)
+      thread_safe (~> 0.1)
+    xcodeproj (0.28.2)
+      activesupport (>= 3)
+      claide (~> 0.9.1)
+      colored (~> 1.2)
     xcpretty (0.2.2)
       rouge (~> 1.8)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
+  cocoapods
   rake
   xcpretty
 

README.md

@@ -52,6 +52,12 @@ If you want to compile for iOS 7:
 ## CocoaPods Install
 
 Add `pod 'Charts'` to your Podfile. "Charts" is the name of the library.  
+
+For Realm support you can specify the subspec in your Podfile as follows:
+```
+pod 'Charts/Realm'
+```
+
 **Note:** ~~`pod 'ios-charts'`~~ is not the correct library, and refers to a different project by someone else.
 
 ## Carthage Install
@@ -70,7 +76,7 @@ In order to build the binaries for a new release, use `carthage build --no-skip-
 If you like what you see here, and want to support the work being done in this repository, you could:
 * Contribute code, issues and pull requests
 * Let people know this library exists (spread the word!)
-* 
+*
 [![Donate](https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=68UL6Y8KUPS96) (You can buy me a beer, or you can buy me dinner :-)
 
 **Note:** The author of [MPAndroidChart](https://github.com/PhilJay/MPAndroidChart) is the reason that this library exists, and is accepting [donations](https://github.com/PhilJay/MPAndroidChart#donations) on his page. He deserves them!
@@ -172,7 +178,7 @@ Or you can see the [**ChartsDemo**](https://github.com/danielgindi/ios-charts/tr
 Special Thanks
 =======
 
-Goes to [@liuxuan30](https://github.com/liuxuan30), [@petester42](https://github.com/petester42) and  [@AlBirdie](https://github.com/AlBirdie) for new features, bugfixes, and lots and lots of involvement in our open-sourced community! You guys are a huge help to all of those coming here with questions and issues, and I couldn't respond to all of those without you. 
+Goes to [@liuxuan30](https://github.com/liuxuan30), [@petester42](https://github.com/petester42) and  [@AlBirdie](https://github.com/AlBirdie) for new features, bugfixes, and lots and lots of involvement in our open-sourced community! You guys are a huge help to all of those coming here with questions and issues, and I couldn't respond to all of those without you.
 
 License
 =======