自定义UITabBarController

第一步：在AppDelegate中实现

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    self.window.rootViewController = [ZZTabViewController new];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    
    [self setupNavBar];
    
    // Override point for customization after application launch.
    return YES;
}
- (void)setupNavBar {
    [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;
    
    UINavigationBar *bar = [UINavigationBar appearance];
    CGFloat rgb = 0.1;
    bar.barTintColor = [UIColor colorWithRed:rgb green:rgb blue:rgb alpha:0.9];
    bar.tintColor = [UIColor whiteColor];
    bar.titleTextAttributes = @{NSForegroundColorAttributeName:[UIColor whiteColor]};
}

第二步：自定义一个继承于UINavigationController的ZZNavigationController类

在自定义继承于UITabBarController的ZZTabViewController中实现以下的代码

#import "ZZTabViewController.h"
#import "HomeViewController.h"
#import "ContactViewController.h"
#import "FindViewController.h"
#import "MineViewController.h"
#import "ZZNavigationController.h"

#define kClassKey   @"rootVCClassString"
#define kTitleKey   @"title"
#define kImgKey     @"imageName"
#define kSelImgKey  @"selectedImageName"
#define Global_tintColor [UIColor colorWithRed:0 green:(190 / 255.0) blue:(12 / 255.0) alpha:1]

@interface ZZTabViewController ()

@end
@implementation ZZTabViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    
    NSArray *childItemsArray = @[
                                 @{kClassKey : @"HomeViewController",
                                   kTitleKey : @"微信",
                                   kImgKey : @"tabbar_mainframe",
                                   kSelImgKey : @"tabbar_mainframeHL"},
                                 
                                 @{kClassKey : @"ContactViewController",
                                   kTitleKey : @"通讯录",
                                   kImgKey : @"tabbar_contacts",
                                   kSelImgKey : @"tabbar_contactsHL"},
                                 
                                 @{kClassKey : @"FindViewController",
                                   kTitleKey : @"发现",
                                   kImgKey : @"tabbar_discover",
                                   kSelImgKey : @"tabbar_discoverHL"},
                                 
                                 @{kClassKey : @"MineViewController",
                                   kTitleKey : @"我的",
                                   kImgKey : @"tabbar_me",
                                   kSelImgKey : @"tabbar_meHL"} ];
    
    [childItemsArray enumerateObjectsUsingBlock:^(NSDictionary *dict, NSUInteger idx, BOOL *stop) {
        UIViewController *vc = [NSClassFromString(dict[kClassKey]) new];
        vc.title = dict[kTitleKey];
        ZZNavigationController *nav = [[ZZNavigationController alloc] initWithRootViewController:vc];
        UITabBarItem *item = nav.tabBarItem;
        item.title = dict[kTitleKey];
        item.image = [UIImage imageNamed:dict[kImgKey]];
        item.selectedImage = [[UIImage imageNamed:dict[kSelImgKey]] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
        [item setTitleTextAttributes:@{NSForegroundColorAttributeName : Global_tintColor} forState:UIControlStateSelected];
        [self addChildViewController:nav];
    }];
    
    // Do any additional setup after loading the view from its nib.
}
@end

运行效果如图所示