1.更改tabbar的字体的颜色:
[[UITabBarItem appearance]setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor],NSForegroundColorAttributeName, nil] forState:(UIControlStateSelected)];
2.设置状态栏的样式:
[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;