Swift学习 - UITabBarController使用

一、在AppDelegate.swift

//
//  AppDelegate.swift
//  FirstTrain
//
//  Created by 纵昂 on 2021/3/10.
//

import UIKit

@main
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        
        window = UIWindow(frame: UIScreen.main.bounds)
        window?.backgroundColor = .white
//     我们修改 AppDelegate.swift，让 window 的 rootViewController 为我们的 MainTabBarController：
        window?.rootViewController = MainTabBarController()
//        window?.rootViewController = UINavigationController(rootViewController: MainTabBarController()) //添加导航
        window?.makeKeyAndVisible()
        
        return true
    }
}

二、去创建五个试图控制器 试图控制器.png

紧接着创建UITabBarController，开始布局

//
//  MainTabBarController.swift
//  FirstTrain
//
//  Created by 纵昂 on 2021/3/10.
//

import UIKit

class MainTabBarController: UITabBarController {

    override func viewDidLoad() {
        super.viewDidLoad()
        initTabBar()
    }
    
    func initTabBar() {
        let home = UINavigationController(rootViewController: HomeViewController())
        home.tabBarItem.title = "首页"
        home.tabBarItem.image = UIImage(named: "tabbar_car_select.png")
        
        let category = UINavigationController(rootViewController: HHHViewController())
        category.tabBarItem.title = "分类"
        category.tabBarItem.image = UIImage(named: "tabbar_fenlei_select.png")
       
        let cart = UINavigationController(rootViewController: FirstViewController())
        cart.tabBarItem.title = "购物车"
        cart.tabBarItem.image = UIImage(named: "tabbar_car_select.png")

        let mine = UINavigationController(rootViewController: MYViewController())
        mine.tabBarItem.title = "我的"
        mine.tabBarItem.image = UIImage(named: "tabbar_serach_select.png")

        let message = UINavigationController(rootViewController: MessageViewController())
        message.tabBarItem.title = "消息"
        message.tabBarItem.image = UIImage(named: "tabbar_message_select")
        
        
        viewControllers = [home,category,cart,mine]
        
        // 设置 tabBar & tabBarItem
        setTabBarItemAttributes(bgColor: UIColor(red: 0.95, green: 0.95, blue: 0.95, alpha: 1))
        
    }
    
    /// 这种方式比较灵活
       func setTabBarItemAttributes(fontName: String = "Courier",
                                    fontSize: CGFloat = 14,
                                    normalColor: UIColor = .gray,
                                    selectedColor: UIColor = .red,
                                    bgColor: UIColor = .white) {
           // tabBarItem 文字大小
           var attributes: [NSAttributedString.Key: Any] = [.font: UIFont(name: fontName, size: fontSize)!]
           
           // tabBarItem 文字默认颜色
           attributes[.foregroundColor] = normalColor
           UITabBarItem.appearance().setTitleTextAttributes(attributes, for: .normal)
           
           // tabBarItem 文字选中颜色
           attributes[.foregroundColor] = selectedColor
           UITabBarItem.appearance().setTitleTextAttributes(attributes, for: .selected)
           
           // tabBar 文字、图片 统一选中高亮色
           tabBar.tintColor = selectedColor
           
           // tabBar 背景色
           tabBar.barTintColor = bgColor
       }


    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destination.
        // Pass the selected object to the new view controller.
    }
    */

}

三、首页代码

//
//  HomeViewController.swift
//  FirstTrain
//
//  Created by 纵昂 on 2021/3/10.
//

import UIKit

class HomeViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        title = "Home" //导航标题
        
        
    }
    

    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destination.
        // Pass the selected object to the new view controller.
    }
    */

}

常用的tabBar底部控制器导航，此文不厚严谨，后续不定时更新内容干货
代码已上传到GitHuB上