Attempting to add the pinning mode as an example.

Example/AFNetworking iOS Example.xcodeproj/project.pbxproj

@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		2982AD3217107C0000FFF048 /* adn.cer in Resources */ = {isa = PBXBuildFile; fileRef = 2982AD3117107C0000FFF048 /* adn.cer */; };
 		F8129C7415910C37009BFE23 /* AppDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = F8129C7215910C37009BFE23 /* AppDelegate.m */; };
 		F818101615E6A0C600EF93C2 /* MobileCoreServices.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 50ABD6EC159FC2CE001BE42C /* MobileCoreServices.framework */; };
 		F88812F016C533D6003C8B8C /* Security.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = F8E469E013957DF100DB05C8 /* Security.framework */; };
@@ -40,6 +41,7 @@
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
+		2982AD3117107C0000FFF048 /* adn.cer */ = {isa = PBXFileReference; lastKnownFileType = file; path = adn.cer; sourceTree = SOURCE_ROOT; };
 		50ABD6EC159FC2CE001BE42C /* MobileCoreServices.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = MobileCoreServices.framework; path = System/Library/Frameworks/MobileCoreServices.framework; sourceTree = SDKROOT; };
 		F8129C3815910830009BFE23 /* Prefix.pch */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = Prefix.pch; sourceTree = SOURCE_ROOT; };
 		F8129C7215910C37009BFE23 /* AppDelegate.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = AppDelegate.m; sourceTree = SOURCE_ROOT; };
@@ -198,6 +200,7 @@
 		F8E4696B1395739D00DB05C8 /* Supporting Files */ = {
 			isa = PBXGroup;
 			children = (
+				2982AD3117107C0000FFF048 /* adn.cer */,
 				F8DA09E31396AC040057D0CC /* main.m */,
 				F8129C3815910830009BFE23 /* Prefix.pch */,
 				F8E4696C1395739D00DB05C8 /* iOS-Info.plist */,
@@ -319,6 +322,7 @@
 				F8A847C1161F51A300940F39 /* Default-568h@2x.png in Resources */,
 				F8A847C3161F523E00940F39 /* Default.png in Resources */,
 				F8A847C5161F524200940F39 /* Default@2x.png in Resources */,
+				2982AD3217107C0000FFF048 /* adn.cer in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

Example/Classes/AFAppDotNetAPIClient.m

@@ -49,6 +49,8 @@ static NSString * const kAFAppDotNetAPIBaseURLString = @"https://alpha-api.app.n
     // Accept HTTP Header; see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1
 	[self setDefaultHeader:@"Accept" value:@"application/json"];
     
+    [self setDefaultSSLPinningMode:AFSSLPinningModePublicKey];
+    
     return self;
 }