IOS状态栏设置

要实现效果：

在Launch启动界面全屏，启动后状态栏字体颜色为白色

步骤：
1.在info.list中添加字段

Status bar is initially hidden  : Yes

View controller-based status bar appearance  : No

2.在AppDelegate.m中初始化代码

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    //1.创建窗口
    self.window=[[UIWindow alloc]init];
    self.window.frame=[UIScreen mainScreen].bounds;
    //2.设置根控制器
    self.window.rootViewController=[[MyTabBarController alloc]init];
    //3.显示窗口
    [self.window makeKeyAndVisible];
    //4.显示状态栏
    [UIApplication sharedApplication].statusBarHidden=NO;
    //5.状态栏颜色设置
    [UIApplication sharedApplication].statusBarStyle=UIStatusBarStyleLightContent;

    return YES;
}