Swift|Swift 4.0 如何改变 tabBar 标签栏图片、字体颜色和大小 Swift4.0如何改变tabBar标签栏图片

方法一：
直接在 AppDelegate 的didFinishLaunchingWithOptions 方法中设置：

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {let nav1 = UINavigationController(rootViewController: UIViewController()) nav1.tabBarItem = UITabBarItem(title: "首页", image: UIImage(named: "tabbar_normal1"), selectedImage: UIImage(named: "tabbar_selected1"))let nav2 =UINavigationController(rootViewController: UIViewController()) nav2.tabBarItem = UITabBarItem(title: "消息", image: UIImage(named: "tabbar_normal2"), selectedImage: UIImage(named: "tabbar_selected2"))let nav3 = UINavigationController(rootViewController: UIViewController()) nav3.tabBarItem = UITabBarItem(title: "我的", image: UIImage(named: "tabbar_normal3"), selectedImage: UIImage(named: "tabbar_selected3"))let nav4 = UINavigationController(rootViewController: UIViewController()) nav4.tabBarItem = UITabBarItem(title: "更多", image: UIImage(named: "tabbar_normal4"), selectedImage: UIImage(named: "tabbar_selected4"))let tabBarCtl = UITabBarController() tabBarCtl.viewControllers = [nav1, nav2, nav3, nav4]for item in tabBarCtl.viewControllers! { // 遵循图片原始颜色，否则图片会变成系统默认的蓝色 item.tabBarItem.selectedImage = item.tabBarItem.selectedImage!.withRenderingMode(.alwaysOriginal) // 修改标签栏选中时文字颜色 item.tabBarItem.setTitleTextAttributes([NSAttributedStringKey.foregroundColor: UIColor.red], for: .selected) // 修改标签栏未选中时文字颜色 item.tabBarItem.setTitleTextAttributes([NSAttributedStringKey.foregroundColor: UIColor.green], for: .normal) }self.window!.rootViewController = tabBarCtlreturn true }

方法二：
自定义 UITabBarController：

class CustomTabBarController: UITabBarController {override func viewDidLoad() { super.viewDidLoad()// 修改标签栏的 bar 颜色 //self.tabBar.barTintColor = UIColor.white // 修改标签栏的默认 tintColor，会改变图片和文字 //self.tabBar.tintColor = UIColor.yellow// 修改标签栏选中时文字颜色、字体 UITabBarItem.appearance().setTitleTextAttributes([NSAttributedStringKey.foregroundColor: UIColor.red, NSAttributedStringKey.font: UIFont.boldSystemFont(ofSize: 18.0)], for: .selected) // 修改标签栏未选中时文字颜色、字体 UITabBarItem.appearance().setTitleTextAttributes([NSAttributedStringKey.foregroundColor: UIColor.orange, NSAttributedStringKey.font: UIFont.boldSystemFont(ofSize: 18.0)], for: .normal) // 设置字体偏移 //UITabBarItem.appearance().titlePositionAdjustment = UIOffsetMake(0.0, 0.0)self.addChildVC() }override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. }/// 添加控制器 fileprivate func addChildVC() { self.setupOneChildViewController(UIViewController(), title: "首页", normalImage: "tabbar_normal1", selectedImage: "tabbar_selected1") self.setupOneChildViewController(UIViewController(), title: "消息", normalImage: "tabbar_normal2", selectedImage: "tabbar_selected2") self.setupOneChildViewController(UIViewController(), title: "我的", normalImage: "tabbar_normal3", selectedImage: "tabbar_selected3") self.setupOneChildViewController(UIViewController(), title: "更多", normalImage: "tabbar_normal4", selectedImage: "tabbar_selected4") }fileprivate func setupOneChildViewController(_ vc: UIViewController, title: String, normalImage: String, selectedImage: String) { let nav = UINavigationController(rootViewController: vc) nav.tabBarItem = UITabBarItem(title: title, image: UIImage(named: normalImage), selectedImage: UIImage(named: selectedImage)) // 设置选中图片颜色，否则图片会变成系统默认的蓝色 nav.tabBarItem.selectedImage = nav.tabBarItem.selectedImage!.withRenderingMode(.alwaysOriginal) addChildViewController(nav) }}