IOS实现底部导航栏

//
//  AppDelegate.h
//  tabbar
//
//  Created by iOS on 2022/7/29.
//

#import <UIKit/UIKit.h>
#import <CoreData/CoreData.h>


@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (nonatomic, strong) UIWindow * window;

@end

//
//  AppDelegate.m
//  UITabbarProject
//
//  Created by apple on 2024/5/5.
//

#import "AppDelegate.h"
#import "ViewController.h"
#import "ViewController2.h"
#import "ViewController1.h"


@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.backgroundColor = [UIColor whiteColor];

    // 创建tabbar所管理的子控制器，每个子控制器都带有一个导航
    ViewController1 *redVC = [[ViewController1 alloc] init];
    UINavigationController *navi1 = [[UINavigationController alloc] initWithRootViewController:redVC];
    ViewController2 *greenVC = [[ViewController2 alloc] init];
    UINavigationController *navi2 = [[UINavigationController alloc] initWithRootViewController:greenVC];
    
    // 创建UITabBarController对象
    UITabBarController *tabbar = [[UITabBarController alloc] init];
    
    // 设置tabbar的子控制器
    tabbar.viewControllers = @[navi1, navi2];
    tabbar.view.backgroundColor = [UIColor whiteColor];
    
    // 将标签控制器设置为根视图控制器
    self.window.rootViewController = tabbar;
    
    [self.window makeKeyAndVisible];
    
    UITabBar *tab = tabbar.tabBar;
    tab.backgroundColor = [UIColor whiteColor];
    
    UITabBarItem *item = tab.items[0];
    item.image = [self resizeImage:[UIImage imageNamed:@"home.png"] newSize:CGSizeMake(30, 30)];
    item.title = @"首页";


    UITabBarItem *item2 = tab.items[1];
    item2.image = [self resizeImage:[UIImage imageNamed:@"user.png"] newSize:CGSizeMake(30, 30)];
    item2.title = @"发现";
    item2.badgeValue = @"900";

    
    


    return YES;
}


- (UIImage *)resizeImage:(UIImage *)image newSize:(CGSize)newSize {
    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}





@end

//
//  ViewController.h
//  tabbar
//
//  Created by iOS on 2022/7/29.
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController


@end

//
//  ViewController.m
//  tabbar
//
//  Created by iOS on 2022/7/29.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}


@end

//
//  ViewController2.h
//  UITabbarProject
//
//  Created by apple on 2024/5/5.
//

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface ViewController2 : UIViewController

@end

NS_ASSUME_NONNULL_END

//
//  ViewController2.m
//  UITabbarProject
//
//  Created by apple on 2024/5/5.
//

#import "ViewController2.h"
#import "ViewController.h"

@interface ViewController2 ()

@end

@implementation ViewController2

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor redColor];
    
    
    [self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor systemBlueColor],NSFontAttributeName:[UIFont systemFontOfSize:18.0f]}];

    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"Next" style:UIBarButtonItemStylePlain target:self action:@selector(Nextpage)];
    self.navigationItem.title = @"红色";

//    UIView *white =[[UIView alloc]initWithFrame:CGRectMake(0, 0, 500, 64)];
//    white.backgroundColor = [UIColor whiteColor];
//    [self.view addSubview:white];
    

}


-(void)Nextpage
{
    ViewController *blue = [[ViewController alloc]init];
    blue.hidesBottomBarWhenPushed = YES; // 隐藏底部导航栏
    [self.navigationController pushViewController:blue animated:YES];
}
/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

//
//  ViewController1.h
//  UITabbarProject
//
//  Created by apple on 2024/5/5.
//

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface ViewController1 : UIViewController

@end

NS_ASSUME_NONNULL_END

//
//  ViewController1.m
//  UITabbarProject
//
//  Created by apple on 2024/5/5.
//

#import "ViewController1.h"

@interface ViewController1 ()

@end

@implementation ViewController1

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor greenColor];
    self.navigationItem.title = @"绿色";
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

视频审核太慢了就不贴了