如何以编程方式创建具有自定义选项卡栏形状的自定义选项卡栏控制器

Question

我试图完全用代码创建我的iOS移动应用程序。这样做会导致我的自定义标签栏控制器出现问题，并带有自定义标签栏形状。

My custom tab bar shape looks something along the lines of this

AppDelegate.swift：

func application(_ application: UIApplication,
                 didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

    window = UIWindow()
    window.rootViewController = CustomTabBarController()
    window?.makeKeyAndVisible()
    return true
}

在我的自定义TabBarController中：

import UIKit

class CustomTabBarController: UITabBarController {

    override func viewDidLoad() {
        super.viewDidLoad()
        setupCenterButton()
    }

    func setupCenterButton() {
        let menuButton = UIButton(frame: CGRect(x: 0, y: 0, width: 64, height: 64))

        var menuButtonFrame = menuButton.frame
        menuButtonFrame.origin.y = view.bounds.height - menuButtonFrame.height - 48
        menuButtonFrame.origin.x = view.bounds.width/2 - menuButtonFrame.size.width/2
        menuButton.frame = menuButtonFrame
        menuButton.clipsToBounds = true
        menuButton.layer.cornerRadius = menuButtonFrame.height/2
        view.addSubview(menuButton)
    }


}


extension UITabBar {

    open override func sizeThatFits(_ size: CGSize) -> CGSize {
        return CGSize(width: size.width, height: 64)
    }
}

而我的自定义标签栏形状

import UIKit

class CustomizedTabBar: UITabBar {

private var shapeLayer: CALayer?

private func addShape() {
    let shapeLayer = CAShapeLayer()
    shapeLayer.path = createPath()

    if let oldShapeLayer = self.shapeLayer {
        self.layer.replaceSublayer(oldShapeLayer, with: shapeLayer)
    } else {
        self.layer.insertSublayer(shapeLayer, at: 0)
    }

    self.shapeLayer = shapeLayer
}

func createPath() -> CGPath {
    let path = UIBezierPath()

    path.move(to: CGPoint(x: 0, y: 0))
    //..path moving around..
    path.close()

    return path.cgPath
}

override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
    //..stuff
}

override func draw(_ rect: CGRect) {
    self.addShape()
}

func createBezierPath() -> UIBezierPath {

    //..creating a path
}

我该如何解决这个问题？使用当前的代码设置，我的tabbar就像一个普通的tabbar ...而不是我的自定义形状see here

我试图在我的UITabBarController中覆盖我的标签栏属性，以返回我的CustomizedBarBar类的实例，没有运气。任何帮助将非常感激！

Answer 1

请尝试以这种方式运行，并告诉我。

class MyTab: UITabBar {

}
class MyTabBarController: UITabBarController {
    override var tabBar: UITabBar {
        return MyTab()
    }
}