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, 20, 20)];
    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 = 0;
    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 = 3; //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