CompletedCodeChallenge

ChangingBackground.xcodeproj/project.pbxproj

@@ -24,6 +24,7 @@
 		001809EC171C6764002D3E93 /* blue@2x.png in Resources */ = {isa = PBXBuildFile; fileRef = 001809E8171C6764002D3E93 /* blue@2x.png */; };
 		001809ED171C6764002D3E93 /* green.png in Resources */ = {isa = PBXBuildFile; fileRef = 001809E9171C6764002D3E93 /* green.png */; };
 		001809EE171C6764002D3E93 /* green@2x.png in Resources */ = {isa = PBXBuildFile; fileRef = 001809EA171C6764002D3E93 /* green@2x.png */; };
+		C92290E118DA4399001CA299 /* BackgroundNavigationViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = C92290E018DA4399001CA299 /* BackgroundNavigationViewController.m */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -50,6 +51,8 @@
 		001809E8171C6764002D3E93 /* blue@2x.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = "blue@2x.png"; sourceTree = "<group>"; };
 		001809E9171C6764002D3E93 /* green.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = green.png; sourceTree = "<group>"; };
 		001809EA171C6764002D3E93 /* green@2x.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = "green@2x.png"; sourceTree = "<group>"; };
+		C92290DF18DA4399001CA299 /* BackgroundNavigationViewController.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = BackgroundNavigationViewController.h; sourceTree = "<group>"; };
+		C92290E018DA4399001CA299 /* BackgroundNavigationViewController.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = BackgroundNavigationViewController.m; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -152,6 +155,8 @@
 				001809DD171C64E3002D3E93 /* SecondViewController.h */,
 				001809DE171C64E3002D3E93 /* SecondViewController.m */,
 				001809DF171C64E3002D3E93 /* SecondViewController.xib */,
+				C92290DF18DA4399001CA299 /* BackgroundNavigationViewController.h */,
+				C92290E018DA4399001CA299 /* BackgroundNavigationViewController.m */,
 			);
 			name = SecondViewController;
 			sourceTree = "<group>";
@@ -238,6 +243,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				C92290E118DA4399001CA299 /* BackgroundNavigationViewController.m in Sources */,
 				001809C5171C637E002D3E93 /* main.m in Sources */,
 				001809C9171C637E002D3E93 /* AppDelegate.m in Sources */,
 				001809D9171C6448002D3E93 /* FirstViewController.m in Sources */,
@@ -356,6 +362,7 @@
 				001809D4171C637E002D3E93 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
 	};

ChangingBackground/AppDelegate.m

@@ -8,6 +8,7 @@
 
 #import "AppDelegate.h"
 #import "FirstViewController.h"
+#import "BackgroundNavigationViewController.h"
 
 @interface AppDelegate () {
     UIWindow *window;
@@ -22,7 +23,7 @@ - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(
     [window makeKeyAndVisible];
 
     FirstViewController *firstViewController = FirstViewController.new;
-    UINavigationController *navigationController = [UINavigationController.alloc initWithRootViewController:firstViewController];
+    BackgroundNavigationViewController *navigationController = [BackgroundNavigationViewController.alloc initWithRootViewController:firstViewController];
     [navigationController setNavigationBarHidden:YES];
 
     window.rootViewController = navigationController;

ChangingBackground/BackgroundNavigationViewController.h

@@ -0,0 +1,13 @@
+//
+//  BackgroundNavigationViewController.h
+//  ChangingBackground
+//
+//  Created by Matthew Voracek on 3/19/14.
+//  Copyright (c) 2014 Ora Interactive. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface BackgroundNavigationViewController : UINavigationController <UINavigationControllerDelegate>
+
+@end

ChangingBackground/BackgroundNavigationViewController.m

@@ -0,0 +1,68 @@
+//
+//  BackgroundNavigationViewController.m
+//  ChangingBackground
+//
+//  Created by Matthew Voracek on 3/19/14.
+//  Copyright (c) 2014 Ora Interactive. All rights reserved.
+//
+
+#import "BackgroundNavigationViewController.h"
+
+@interface BackgroundNavigationViewController ()
+
+//@property NSString *backgroundNameShowing;
+//@property NSString *backgroundNameHiding;
+
+@property UIImageView *backgroundImageBlue;
+@property UIImageView *backgroundImageGreen;
+@property BOOL isBlueShowing;
+
+@end
+
+@implementation BackgroundNavigationViewController
+
+- (void)viewDidLoad
+{
+    [super viewDidLoad];
+
+    self.delegate = self;
+
+    _backgroundImageBlue = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"blue"]];
+    [self.view addSubview:_backgroundImageBlue];
+
+    _backgroundImageGreen = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"green"]];
+    [self.view addSubview:_backgroundImageGreen];
+    _backgroundImageGreen.alpha = 0.0;
+    [self.view sendSubviewToBack:_backgroundImageGreen];
+    [self.view sendSubviewToBack:_backgroundImageBlue];
+    _isBlueShowing = NO;
+}
+
+-(void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
+{
+
+    if (_isBlueShowing == YES)
+    {
+        [UIImageView animateWithDuration:5.0 animations:^{
+            _backgroundImageGreen.alpha = 1;
+        } completion:^(BOOL finished)
+         {
+             _backgroundImageBlue.alpha = 0.0;
+             [self.view sendSubviewToBack:_backgroundImageGreen];
+             _isBlueShowing = NO;
+         }];
+    }
+    else
+    {
+        [UIImageView animateWithDuration:5.0 animations:^{
+            _backgroundImageBlue.alpha = 1;
+        } completion:^(BOOL finished)
+         {
+             _backgroundImageGreen.alpha = 0.0;
+             [self.view sendSubviewToBack:_backgroundImageBlue];
+             _isBlueShowing = YES;
+         }];
+    }
+}
+
+@end