Swift:带有中心圆形按钮的自定义 TabBar

本文介绍了Swift:带有中心圆形按钮的自定义 TabBar的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

限时送ChatGPT账号..

我尝试创建如下图所示的自定义标签栏:

I try to create custom tabbar like the below picture:

下面是我得到的结果:

以下是我当前的代码:

class CustomTabBarController: UITabBarController {


    override func viewDidLoad() {
        super.viewDidLoad()

        let controller1 = UIViewController()
        controller1.tabBarItem = UITabBarItem(tabBarSystemItem: .contacts, tag: 1)
        let nav1 = UINavigationController(rootViewController: controller1)

        let controller2 = UIViewController()
        controller2.tabBarItem = UITabBarItem(tabBarSystemItem: .contacts, tag: 2)
        let nav2 = UINavigationController(rootViewController: controller2)

        let controller3 = UIViewController()
        let nav3 = UINavigationController(rootViewController: controller3)
        nav3.title = ""

        let controller4 = UIViewController()
        controller4.tabBarItem = UITabBarItem(tabBarSystemItem: .contacts, tag: 4)
        let nav4 = UINavigationController(rootViewController: controller4)

        let controller5 = UIViewController()
        controller5.tabBarItem = UITabBarItem(tabBarSystemItem: .contacts, tag: 5)
        let nav5 = UINavigationController(rootViewController: controller5)

        viewControllers = [nav1, nav2, nav3, nav4, nav5]
        setupMiddleButton()  
    }

    func setupMiddleButton() {
        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 - 50
        menuButtonFrame.origin.x = view.bounds.width/2 - menuButtonFrame.size.width/2
        menuButton.frame = menuButtonFrame

        menuButton.backgroundColor = UIColor.red
        menuButton.layer.cornerRadius = menuButtonFrame.height/2
        view.addSubview(menuButton)

        menuButton.setImage(UIImage(named: "example"), for: .normal)
        menuButton.addTarget(self, action: #selector(menuButtonAction(sender:)), for: .touchUpInside)

        view.layoutIfNeeded()
    }


    // MARK: - Actions

    @objc private func menuButtonAction(sender: UIButton) {
        selectedIndex = 2
    }

}

如何绘制第一个图片关节的tabbar的形状

How can I draw the shape of the tabbar of the first picture joint

我一直坚持下去，非常感谢您的帮助

I'm stuck on it that makes several thanks for your help

推荐答案

你需要自定义你的CustomTabBarController的tabbar

You need to customise the tabbar of your CustomTabBarController

只需将 AppTabBar 分配给您的 tabBarController 的标签栏，就可以像这样它应该有效

Just assign the AppTabBar to the tabbar of your tabBarController for storyboard like this it should works

@IBDesignable
class AppTabBar: UITabBar {

    private var shapeLayer: CALayer?

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

    private func addShape() {
        let shapeLayer = CAShapeLayer()
        shapeLayer.path = createPath()
        shapeLayer.strokeColor = UIColor.lightGray.cgColor
        shapeLayer.fillColor = #colorLiteral(red: 0.9782002568, green: 0.9782230258, blue: 0.9782107472, alpha: 1)
        shapeLayer.lineWidth = 0.5
        shapeLayer.shadowOffset = CGSize(width:0, height:0)
        shapeLayer.shadowRadius = 10
        shapeLayer.shadowColor = UIColor.gray.cgColor
        shapeLayer.shadowOpacity = 0.3

        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 height: CGFloat = 86.0
        let path = UIBezierPath()
        let centerWidth = self.frame.width / 2
        path.move(to: CGPoint(x: 0, y: 0))
        path.addLine(to: CGPoint(x: (centerWidth - height ), y: 0))
        path.addCurve(to: CGPoint(x: centerWidth, y: height - 40),
                      controlPoint1: CGPoint(x: (centerWidth - 30), y: 0), controlPoint2: CGPoint(x: centerWidth - 35, y: height - 40))
        path.addCurve(to: CGPoint(x: (centerWidth + height ), y: 0),
                      controlPoint1: CGPoint(x: centerWidth + 35, y: height - 40), controlPoint2: CGPoint(x: (centerWidth + 30), y: 0))
        path.addLine(to: CGPoint(x: self.frame.width, y: 0))
        path.addLine(to: CGPoint(x: self.frame.width, y: self.frame.height))
        path.addLine(to: CGPoint(x: 0, y: self.frame.height))
        path.close()
        return path.cgPath
    }

    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        guard !clipsToBounds && !isHidden && alpha > 0 else { return nil }
        for member in subviews.reversed() {
            let subPoint = member.convert(point, from: self)
            guard let result = member.hitTest(subPoint, with: event) else { continue }
            return result
        }
        return nil
    }
}

extension UITabBar {
    override open func sizeThatFits(_ size: CGSize) -> CGSize {
        var sizeThatFits = super.sizeThatFits(size)
        sizeThatFits.height = 74
        return sizeThatFits
    }
}

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