UITabBar边界和阴影问题

Question

我需要将阴影效果放入UITabBar,我通过以下代码得到:

tabBar.layer.shadowOffset = CGSize(width: 0, height: 0)
tabBar.layer.shadowRadius = 4.0
tabBar.layer.shadowColor = UIColor.gray.cgColor
tabBar.layer.shadowOpacity = 0.6

它运作得很好.

但是,我需要删除顶部的边框UITabBar,并通过搜索我得到self.tabBar.clipsToBounds = true,通过放置代码,它删除边框,但它也删除阴影效果.

我需要像下面的图片:

没有边框,但有阴影效果.

任何帮助将不胜感激.

Answer 1

所以@Reinier Melian 提供的答案对我不起作用，但我制作了一个自定义 TabBar 控制器，这种效果有效：

为 Swift 5、iOS 13、Xcode 11 更新

代码：

class MyCustomTabBarController: UITabBarController, UITabBarControllerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        delegate = self

        //here's the code that creates no border, but has a shadow:

        tabBar.layer.shadowColor = UIColor.lightGray.cgColor
        tabBar.layer.shadowOpacity = 0.5
        tabBar.layer.shadowOffset = CGSize.zero
        tabBar.layer.shadowRadius = 5
        self.tabBar.layer.borderColor = UIColor.clear.cgColor
        self.tabBar.layer.borderWidth = 0
        self.tabBar.clipsToBounds = false
        self.tabBar.backgroundColor = UIColor.white
        UITabBar.appearance().shadowImage = UIImage()
        UITabBar.appearance().backgroundImage = UIImage()
    }
}

如何使用它：

要使用它，将一个标签栏控制器拖到故事板上，然后通过下拉菜单将该标签栏的类更改为这个。

Answer 2

您需要添加一个UIView在您的TabBar,并.shadowImage和.backgroundImage等于UIImage()

码

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    if let tabBarController = self.window?.rootViewController as? UITabBarController {

        let tabGradientView = UIView(frame: tabBarController.tabBar.bounds)
        tabGradientView.backgroundColor = UIColor.white
        tabGradientView.translatesAutoresizingMaskIntoConstraints = false;


        tabBarController.tabBar.addSubview(tabGradientView)
        tabBarController.tabBar.sendSubview(toBack: tabGradientView)
        tabGradientView.autoresizingMask = [.flexibleWidth, .flexibleHeight]

        tabGradientView.layer.shadowOffset = CGSize(width: 0, height: 0)
        tabGradientView.layer.shadowRadius = 4.0
        tabGradientView.layer.shadowColor = UIColor.gray.cgColor
        tabGradientView.layer.shadowOpacity = 0.6
        tabBarController.tabBar.clipsToBounds = false
        tabBarController.tabBar.backgroundImage = UIImage()
        tabBarController.tabBar.shadowImage = UIImage()
    }
    // Override point for customization after application launch.
    return true
}

结果