Sample added for include custom header using xib file in iOS

CustomHeader_iOS/CustomHeader_iOS/CustomHeader_iOS.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2012
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CustomHeader_iOS", "CustomHeader_iOS\CustomHeader_iOS.csproj", "{1DD15F65-8353-4F80-83AC-88A03D917C89}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|iPhoneSimulator = Debug|iPhoneSimulator
+		Release|iPhone = Release|iPhone
+		Release|iPhoneSimulator = Release|iPhoneSimulator
+		Debug|iPhone = Debug|iPhone
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{1DD15F65-8353-4F80-83AC-88A03D917C89}.Debug|iPhoneSimulator.ActiveCfg = Debug|iPhoneSimulator
+		{1DD15F65-8353-4F80-83AC-88A03D917C89}.Debug|iPhoneSimulator.Build.0 = Debug|iPhoneSimulator
+		{1DD15F65-8353-4F80-83AC-88A03D917C89}.Release|iPhone.ActiveCfg = Release|iPhone
+		{1DD15F65-8353-4F80-83AC-88A03D917C89}.Release|iPhone.Build.0 = Release|iPhone
+		{1DD15F65-8353-4F80-83AC-88A03D917C89}.Release|iPhoneSimulator.ActiveCfg = Release|iPhoneSimulator
+		{1DD15F65-8353-4F80-83AC-88A03D917C89}.Release|iPhoneSimulator.Build.0 = Release|iPhoneSimulator
+		{1DD15F65-8353-4F80-83AC-88A03D917C89}.Debug|iPhone.ActiveCfg = Debug|iPhone
+		{1DD15F65-8353-4F80-83AC-88A03D917C89}.Debug|iPhone.Build.0 = Debug|iPhone
+	EndGlobalSection
+EndGlobal

CustomHeader_iOS/CustomHeader_iOS/CustomHeader_iOS.userprefs

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+<Properties StartupConfiguration="{1DD15F65-8353-4F80-83AC-88A03D917C89}|Default">
+  <MonoDevelop.Ide.Workbench />
+  <MonoDevelop.Ide.Workspace ActiveConfiguration="Debug|iPhoneSimulator" />
+  <MonoDevelop.Ide.DebuggingService.Breakpoints>
+    <BreakpointStore />
+  </MonoDevelop.Ide.DebuggingService.Breakpoints>
+  <MonoDevelop.Ide.DebuggingService.PinnedWatches />
+  <MonoDevelop.Ide.ItemProperties.CustomHeader__iOS PreferredExecutionTarget="MonoDevelop.IPhone.IPhoneSimulatorTarget.3F5CCBDC-F469-4946-B236-851400FC9422">
+    <MonoDevelop.MacDev.AppleDevelopmentTeam />
+  </MonoDevelop.Ide.ItemProperties.CustomHeader__iOS>
+  <MultiItemStartupConfigurations />
+</Properties>

CustomHeader_iOS/CustomHeader_iOS/CustomHeader_iOS/AppDelegate.cs

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+using Foundation;
+using UIKit;
+
+namespace CustomHeader_iOS
+{
+    // The UIApplicationDelegate for the application. This class is responsible for launching the
+    // User Interface of the application, as well as listening (and optionally responding) to application events from iOS.
+    [Register("AppDelegate")]
+    public class AppDelegate : UIApplicationDelegate
+    {
+        // class-level declarations
+
+        public override UIWindow Window
+        {
+            get;
+            set;
+        }
+
+        public override bool FinishedLaunching(UIApplication application, NSDictionary launchOptions)
+        {
+            // Override point for customization after application launch.
+            // If not required for your application you can safely delete this method
+            return true;
+        }
+
+        public override void OnResignActivation(UIApplication application)
+        {
+            // Invoked when the application is about to move from active to inactive state.
+            // This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) 
+            // or when the user quits the application and it begins the transition to the background state.
+            // Games should use this method to pause the game.
+        }
+
+        public override void DidEnterBackground(UIApplication application)
+        {
+            // Use this method to release shared resources, save user data, invalidate timers and store the application state.
+            // If your application supports background exection this method is called instead of WillTerminate when the user quits.
+        }
+
+        public override void WillEnterForeground(UIApplication application)
+        {
+            // Called as part of the transiton from background to active state.
+            // Here you can undo many of the changes made on entering the background.
+        }
+
+        public override void OnActivated(UIApplication application)
+        {
+            // Restart any tasks that were paused (or not yet started) while the application was inactive. 
+            // If the application was previously in the background, optionally refresh the user interface.
+        }
+
+        public override void WillTerminate(UIApplication application)
+        {
+            // Called when the application is about to terminate. Save data, if needed. See also DidEnterBackground.
+        }
+    }
+}
+

CustomHeader_iOS/CustomHeader_iOS/CustomHeader_iOS/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "83.5x83.5",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "size" : "1024x1024",
+      "scale" : "1x"
+    },
+    {
+      "size" : "24x24",
+      "idiom" : "watch",
+      "scale" : "2x",
+      "role" : "notificationCenter",
+      "subtype" : "38mm"
+    },
+    {
+      "size" : "27.5x27.5",
+      "idiom" : "watch",
+      "scale" : "2x",
+      "role" : "notificationCenter",
+      "subtype" : "42mm"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "watch",
+      "role" : "companionSettings",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "watch",
+      "role" : "companionSettings",
+      "scale" : "3x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "watch",
+      "scale" : "2x",
+      "role" : "appLauncher",
+      "subtype" : "38mm"
+    },
+    {
+      "size" : "44x44",
+      "idiom" : "watch",
+      "scale" : "2x",
+      "role" : "longLook",
+      "subtype" : "42mm"
+    },
+    {
+      "size" : "86x86",
+      "idiom" : "watch",
+      "scale" : "2x",
+      "role" : "quickLook",
+      "subtype" : "38mm"
+    },
+    {
+      "size" : "98x98",
+      "idiom" : "watch",
+      "scale" : "2x",
+      "role" : "quickLook",
+      "subtype" : "42mm"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "16x16",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "16x16",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "32x32",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "32x32",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "128x128",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "128x128",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "256x256",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "256x256",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "512x512",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "512x512",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

CustomHeader_iOS/CustomHeader_iOS/CustomHeader_iOS/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}