038改变状态栏的颜色（扩展知识：关于iOS不同版本的消息通知知识）

效果如下：

ViewController.h

 #import <UIKit/UIKit.h>

 @interface ViewController : UIViewController
 @end

ViewController.m

 #import "ViewController.h"

 @interface ViewController ()
 - (void)userNotificationDidPush:(UIApplication *)application;
 @end

 @implementation ViewController

 - (void)viewDidLoad {
     [super viewDidLoad];   

     UILabel *lblMessage = [[UILabel alloc] initWithFrame:CGRectInset(self.view.bounds, , )];
     lblMessage.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
     lblMessage.text = @"需要在PL文件新增行View controller-based status bar appearance=NO；触摸画面后，切换状态条颜色";
     lblMessage.numberOfLines = ;
     lblMessage.textAlignment = NSTextAlignmentCenter;
     lblMessage.textColor = [UIColor brownColor];
     lblMessage.backgroundColor = [UIColor whiteColor];
     [self.view addSubview:lblMessage];   

     self.navigationItem.prompt = @"看看状态栏的颜色变化";
     self.navigationItem.title = @"改变状态栏的颜色";
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
     UIApplication *application = [UIApplication sharedApplication];
     //状态栏样式切换
     if (application.statusBarStyle == UIStatusBarStyleDefault) {
         application.statusBarStyle = UIStatusBarStyleLightContent;
     } else {
         application.statusBarStyle = UIStatusBarStyleDefault;
     }   

     [self userNotificationDidPush:application];
 }

 /**
  *  扩展知识：关于iOS不同版本的消息通知知识
  *
  *  @param application 共享的UIApplication单例模式对象实例
  */
 - (void)userNotificationDidPush:(UIApplication *)application {
     //应用程序图标标记数
     //因为registerUserNotificationSettings方法为iOS8的方法，无法在iOS8以下版本使用；所以需要分别处理
     if([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
         UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge categories:nil];
         [application registerUserNotificationSettings:settings];
     } else {
         [application registerForRemoteNotifications];
     }
     application.applicationIconBadgeNumber = ; //应用程序图标的消息标记数
     //self.tabBarItem.badgeValue = @"3"; //底部选项卡的消息标记数   

     /* 判断Push推送通知是否打开；同上面一样道理需要分别处理
      UIRemoteNotificationType types;
      if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
      types = [[UIApplication sharedApplication] currentUserNotificationSettings].types;
      } else {
      types = [[UIApplication sharedApplication] enabledRemoteNotificationTypes];
      }
      BOOL isEnabledNotification = types & UIRemoteNotificationTypeAlert;
     */
 }

 @end

AppDelegate.h

 #import <UIKit/UIKit.h>

 @interface AppDelegate : UIResponder <UIApplicationDelegate>
 @property (strong, nonatomic) UIWindow *window;
 @property (strong, nonatomic) UINavigationController *navigationController;

 @end

AppDelegate.m

 #import "AppDelegate.h"
 #import "ViewController.h"

 @interface AppDelegate ()
 @end

 @implementation AppDelegate

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
     _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
     ViewController *viewController = [[ViewController alloc] init];
     _navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
     _window.rootViewController = _navigationController;
     [_window addSubview:_navigationController.view];
     [_window makeKeyAndVisible];
     return YES;
 }

 - (void)applicationWillResignActive:(UIApplication *)application {
 }

 - (void)applicationDidEnterBackground:(UIApplication *)application {
 }

 - (void)applicationWillEnterForeground:(UIApplication *)application {
 }

 - (void)applicationDidBecomeActive:(UIApplication *)application {
 }

 - (void)applicationWillTerminate:(UIApplication *)application {
 }

 @end