[Examples] Fix iOS example

Rakefile

@@ -325,11 +325,20 @@ namespace :examples do
       execute_command "rm -rf Pods"
       execute_command "#{pod_command} install --verbose --no-repo-update"
 
-      puts "Building example: AFNetworking iOS Example'"
-      execute_command "xcodebuild -workspace 'AFNetworking Examples.xcworkspace' -scheme 'AFNetworking iOS Example' clean install"
-
       puts "Building example: AFNetworking Mac Example'"
       execute_command "xcodebuild -workspace 'AFNetworking Examples.xcworkspace' -scheme 'AFNetworking Example' clean install"
+
+      puts "Building example: AFNetworking iOS Example'"
+      xcode_version = `xcodebuild -version`.scan(/Xcode (.*)\n/).first.first
+      major_version = xcode_version.split('.').first.to_i
+      # Specifically build against the simulator SDK so we don't have to deal with code signing.
+      if  major_version > 4
+        execute_command "xcodebuild -workspace 'AFNetworking Examples.xcworkspace' -scheme 'AFNetworking iOS Example' clean install ONLY_ACTIVE_ARCH=NO -destination 'platform=iOS Simulator,name=iPhone Retina (4-inch)'"
+      else
+        sdk = Dir.glob("#{`xcode-select -print-path`.chomp}/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator*.sdk").last
+        execute_command "xcodebuild -workspace 'AFNetworking Examples.xcworkspace' -scheme 'AFNetworking iOS Example' clean install ONLY_ACTIVE_ARCH=NO  -sdk #{sdk}"
+      end
+
     end
   end