// 設定navbar和tabbar是否有透明度

self.navigationController.navigationBar.translucent = YES/NO; 

self.tabBarController.tabBar.translucent = YES/NO;

NavBar-導航條

全域性:

[[UINavigationBar appearance] setBarTintColor:[UIColor colorWithRed:200/255.0f green:38/255.0f  blue:39/255.0f alpha:1.0f]];  // 設定導航條背景顏色
[[UINavigationBar appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor whiteColor], NSFontAttributeName:[UIFont systemFontOfSize:18]}]; // 設定導航條字型大小顏色
[[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];  // 設定返回按鈕影象字型顏色

TabBar

// 去掉tabbar的黑線
    [[UITabBar appearance] setShadowImage:[[UIImage alloc]init]];
    [[UITabBar appearance] setBackgroundImage:[[UIImage alloc]init]];
    [[UITabBarItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor grayColor], NSFontAttributeName:[UIFont systemFontOfSize:12]} forState:UIControlStateNormal]; // 設定tabbar的正常狀態的字型顏色大小
    [[UITabBarItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor whiteColor], NSFontAttributeName:[UIFont systemFontOfSize:12]} forState:UIControlStateSelected];  // 設定tabbar選中狀態的字型顏色大小
    [[UITabBar appearance] setBarTintColor:[UIColor colorWithRed:200/255.0f green:38/255.0f  blue:39/255.0f alpha:1.0f]];  // 設定tabbar背景顏色