ios ~ 重写UINavigationController ，隐藏或显示tabBar

.h

@interface ACMainTabBarController : UITabBarController

@end

.m

#import "ACMainTabBarController.h"
#import "KBaseNavigationController.h" // 重写NavigationController

// 首页
#import "ACHomeViewController.h"
#import "HomeNavigationController.h"
// 圈子（宠物圈）
#import "ACPetGroupViewController.h"
#import "PetGroupNavigationViewController.h"
// 预约记录
#import "ACOrderViewController.h"
#import "OrderNavigationViewController.h"
// 个人中心
#import "ACMineViewController.h"
#import "MineNavigationController.h"

#define kCX_FONT(R) [UIFont systemFontOfSize:R]

#define RGB(R,G,B,A) [UIColor colorWithRed:R/255.0fgreen:G/255.0fblue:B/255.0falpha:A/1.0]

#define kIMAGE(imageName) [UIImage imageNamed:[NSString stringWithFormat:@"%@",imageName]]

@interface ACMainTabBarController () <UITabBarDelegate, UITabBarControllerDelegate, UIAppearance>

@property (nonatomic, strong) NSMutableArray *items; // 4 个tabBar

@end

@implementation KMainTabBarController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.delegate=self;


//    self.items = [NSMutableArray arrayWithCapacity:4];

    self.items = [NSMutableArray new];

//    self.tabBar.backgroundImage = [UIImage imageNamed:@""];

// 这是当self.tabBar.translucent = YES时，tabBar的UIVisualEffectView背景色，ios 15 的新属性设置：
    if (@available (iOS 15.0, *)) {
        // iOS 15.0 及以上
        UITabBarAppearance *appearance = [[UITabBarAppearance alloc] init];
        [appearance configureWithOpaqueBackground];
        appearance.backgroundColor = RGBA(236, 231, 222, 1);
        
        self.tabBar.standardAppearance = appearance;
        self.tabBar.scrollEdgeAppearance = self.tabBar.standardAppearance;
    } else {
        
        self.tabBar.barTintColor = RGBA(236, 231, 222, 1);
    }
    /**
     
    // 当tabBar.translucent = NO 时，可以直接设置 tabBar.backgroundColor：
     
    self.tabBar.translucent = NO;
    self.tabBar.barTintColor = RGBA(236, 231, 222, 1);
    self.tabBar.backgroundColor = UIColor.redColor;
     */
    /**
    // swift:
    
    if #available(iOS 15.0, *) {
       let appearance = UITabBarAppearance()
       appearance.configureWithOpaqueBackground()
       appearance.backgroundColor = customColor

       self.tabController.tabBar.standardAppearance = appearance
       self.tabController.tabBar.scrollEdgeAppearance = self.tabController.tabBar.standardAppearance
    }
     */

    HomeNavigationController *homeNC = [[HomeNavigationController alloc] homeinit];

    PetGroupNavigationViewController *petGroupNC = [[PetGroupNavigationViewController alloc] petGroupInit];

    OrderNavigationViewController *orderNC = [[OrderNavigationViewController alloc] orderInit];

    MineNavigationController *mineNC = [[MineNavigationController alloc] mineInit];

/**

// 这样写，就可以省略 创建 UINavigationController 的过程了
    KBaseNavigationController *homeNC = [[KBaseNavigationController alloc] initWithRootViewController:[[CLHomeViewController alloc] init]];

    KBaseNavigationController *forumNC = [[KBaseNavigationController alloc] initWithRootViewController:[[CLForumViewController alloc] init]];

    UINavigationController *mineNC = [[UINavigationController alloc] initWithRootViewController:[[CLMineViewController alloc] init]];

*/

    [self addItemWith:homeNC withTitle:@"首页" withNormalImage:@"home_normal_icon" withSelectedImage:@"home_selected_icon"];

    [self addItemWith:petGroupNC withTitle:@"圈子" withNormalImage:@"type_normal_icon" withSelectedImage:@"type_selected_icon"];

    [self addItemWith:orderNC withTitle:@"预约" withNormalImage:@"yuyue_normal_icon" withSelectedImage:@"yuyue_selected_icon"];

    [self addItemWith:mineNC withTitle:@"我的" withNormalImage:@"mine_normal_icon" withSelectedImage:@"mine_selected_icon"];


    [self finishAddItems];

}

- (void)addItemWith:(__kindof UIViewController *)vc

          withTitle:(NSString*)title

    withNormalImage:(NSString*)normal

  withSelectedImage:(NSString*)selected {



    // 设置 tabbarItem 选中状态的图片(不被系统默认渲染,显示图像原始颜色)
//    UIImage *normalImage = [[UIImage imageNamed:[NSString stringWithFormat:@"%@",normal]] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

    UIImage *normalImage = [kIMAGE(normal) imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    UIImage *selectedImage = [kIMAGE(selected) imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

    vc.tabBarItem = [[UITabBarItem alloc] initWithTitle:title image:normalImage selectedImage:selectedImage];



    // 设置 tabbarItem 选中状态下的文字颜色(不被系统默认渲染,显示文字自定义颜色)
    [[UITabBarItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor grayColor], NSFontAttributeName:[UIFont systemFontOfSize:12]} forState:UIControlStateNormal]; // normal
    [[UITabBarItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName:RGB(186, 129, 217, 1), NSFontAttributeName:[UIFont systemFontOfSize:12]} forState:UIControlStateSelected]; // selected



    if(@available(iOS13.0, *)) {

        // iOS13 及以上

        self.tabBar.tintColor=RGB(186,129,217,1);

        self.tabBar.unselectedItemTintColor = [UIColor grayColor];

   }

//    RGB(186, 129, 217, 1) // 紫色

//    RGB(223, 47, 24, 1)  // 红色

    [_itemsaddObject:vc];
}

- (void)finishAddItems {
    self.viewControllers = [_items copy];
}

@end

在AppDelegate.m

#import "AppDelegate.h"
#import "KMainTabBarController.h"

@interface AppDelegate ()

@property (nonatomic, strong) KMainTabBarController *mainTabBarController;

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
    self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
    self.window.backgroundColor = [UIColor whiteColor];
//    self.window.rootViewController = [UIViewController new];
    self.mainTabBarController = [[KMainTabBarController alloc] init];
    self.window.rootViewController = self.mainTabBarController;
    [self.window makeKeyAndVisible];
    
    /**
    //  UIViewController，如果有登录页的话，可以先去登录页
    GWLoginViewController *loginVC = [[GWLoginViewController alloc] init];
    self.window.rootViewController = [[UINavigationController alloc] initWithRootViewController:loginVC];
    
    */
    
    return YES;
}




@end

设置tabBar：

TabBar

/* 全局设置 */

// TabBar背景颜色

[UITabBar appearance].barTintColor = [UIColor whiteColor];

/* 单独设置 */

// TabBar背景颜色

self.tabBarController.tabBar.barTintColor = [UIColor whiteColor];

TabBar图标颜色

不用写乱七八糟的代码，直接到 Assets.xcassets 里把图片的属性 Render 设置为 Original Image 就可以让颜色按照图片的来，而不会选中变蓝了。

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