Add a private header to the Modules example ObjCPod

examples/Modules Example/ObjCPod/ObjCPod.podspec

@@ -8,6 +8,7 @@ Pod::Spec.new do |s|
   s.license = 'proprietary'
 
   s.source_files  = "src/**/*.{h,m,swift}"
+  s.private_header_files = "src/Private/*.h"
   s.public_header_files = "src/**/*.h"
 
   s.ios.deployment_target = '9.0'

examples/Modules Example/ObjCPod/src/Private/abc_private.h

+@interface ABC (Private)
++ (void)barkSuperLoudly;
+@end
\ No newline at end of file

examples/Modules Example/ObjCPod/src/abc.m

 #import <ObjCPod/abc.h>
+#import "abc_private.h"
 
 #import <Foundation/Foundation.h>
 
 @implementation ABC
 + (void)bark { NSLog(@"woof woof"); }
++ (void)barkSuperLoudly { NSLog(@"WOOF WOOF"); }
 @end