Add Gemfile

Add a `Gemfile` and updated the `npm` command to run CocoaPods via `bundle exec`, which ensures the right version of CocoaPods.

There is some risk that user doesn't have Bundler but I think it should be fairly straightforward as to how to get it.

Author: bachand

Gemfile

@@ -0,0 +1,3 @@
+source "https://rubygems.org"
+
+gem 'cocoapods', '1.2.0'

Gemfile.lock

@@ -0,0 +1,73 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    CFPropertyList (2.3.5)
+    activesupport (4.2.8)
+      i18n (~> 0.7)
+      minitest (~> 5.1)
+      thread_safe (~> 0.3, >= 0.3.4)
+      tzinfo (~> 1.1)
+    claide (1.0.1)
+    cocoapods (1.2.0)
+      activesupport (>= 4.0.2, < 5)
+      claide (>= 1.0.1, < 2.0)
+      cocoapods-core (= 1.2.0)
+      cocoapods-deintegrate (>= 1.0.1, < 2.0)
+      cocoapods-downloader (>= 1.1.3, < 2.0)
+      cocoapods-plugins (>= 1.0.0, < 2.0)
+      cocoapods-search (>= 1.0.0, < 2.0)
+      cocoapods-stats (>= 1.0.0, < 2.0)
+      cocoapods-trunk (>= 1.1.2, < 2.0)
+      cocoapods-try (>= 1.1.0, < 2.0)
+      colored (~> 1.2)
+      escape (~> 0.0.4)
+      fourflusher (~> 2.0.1)
+      gh_inspector (~> 1.0)
+      molinillo (~> 0.5.5)
+      nap (~> 1.0)
+      ruby-macho (~> 0.2.5)
+      xcodeproj (>= 1.4.1, < 2.0)
+    cocoapods-core (1.2.0)
+      activesupport (>= 4.0.2, < 5)
+      fuzzy_match (~> 2.0.4)
+      nap (~> 1.0)
+    cocoapods-deintegrate (1.0.1)
+    cocoapods-downloader (1.1.3)
+    cocoapods-plugins (1.0.0)
+      nap
+    cocoapods-search (1.0.0)
+    cocoapods-stats (1.0.0)
+    cocoapods-trunk (1.1.2)
+      nap (>= 0.8, < 2.0)
+      netrc (= 0.7.8)
+    cocoapods-try (1.1.0)
+    colored (1.2)
+    escape (0.0.4)
+    fourflusher (2.0.1)
+    fuzzy_match (2.0.4)
+    gh_inspector (1.0.3)
+    i18n (0.8.1)
+    minitest (5.10.1)
+    molinillo (0.5.7)
+    nanaimo (0.2.3)
+    nap (1.1.0)
+    netrc (0.7.8)
+    ruby-macho (0.2.6)
+    thread_safe (0.3.6)
+    tzinfo (1.2.3)
+      thread_safe (~> 0.1)
+    xcodeproj (1.4.2)
+      CFPropertyList (~> 2.3.3)
+      activesupport (>= 3)
+      claide (>= 1.0.1, < 2.0)
+      colored (~> 1.2)
+      nanaimo (~> 0.2.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  cocoapods (= 1.2.0)
+
+BUNDLED WITH
+   1.12.5

README.md

@@ -147,7 +147,7 @@ You can check out the example project with the following instructions
 
 For Running iOS:
 
-1. If you don't have CocoaPods installed, run `sudo gem install cocoapods`
+1. If you don't have CocoaPods installed, run `bundle install`
 2. Install pods: `npm run build:pods`
 3. Run Example: `npm run run:ios`
 

package.json

@@ -10,7 +10,7 @@
     "run:android": "react-native run-android --root ./example",
     "lint": "eslint ./",
     "ci": "npm run lint",
-    "build:pods": "cd example/ios; pod install; cd -",
+    "build:pods": "cd example/ios; bundle exec pod install; cd -",
     "postpublish": "npm run publish:maven",
     "publish:maven": "cd lib/android/ && ./gradlew clean check uploadArchives && cd -",
     "docs:clean": "rimraf _book",