如图
类似Instagram 的tabBar，选中的时候的item的背景色更深。怎么设置啊，我已经把UITabBar apperance 试过差不多了都。还有就是UITabBarItem在未选中情况下的颜色怎么设置
[[UITabBar appearance]setBackgroundColor:[UIColor myDarkGrayColorDark]];
[[UITabBar appearance]setTintColor:[UIColor myThemeColor]];
[[UITabBar appearance]setBarTintColor:[UIColor myDarkGrayColor]];
[[UITabBar appearance]setBarStyle:UIBarStyleBlack];
[[UITabBar appearance]setSelectedImageTintColor:[UIColor whiteColor]];
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This should be a custom tabbar. Set the image of the two states of the button and it will be ok.