Swift将徽章添加到导航barButtonItem和UIButton

Question

我正试图在AppIcon上显示的应用程序中显示我的通知按钮上的徽章.

到目前为止,无论我研究过什么都与Obj有关.C,但没有具体讨论如何在Swift中实现该解决方案,

请帮助找到添加自定义类/代码的解决方案,以在UiBarbutton和UiButton上实现Badge.

到目前为止研究:

https://github.com/Marxon13/M13BadgeView

以及MKBadge类等.

Answer 1

有一个更优雅的解决方案,扩展了UIButtonItem

extension CAShapeLayer {
    func drawCircleAtLocation(location: CGPoint, withRadius radius: CGFloat, andColor color: UIColor, filled: Bool) {
        fillColor = filled ? color.cgColor : UIColor.white.cgColor
        strokeColor = color.cgColor
        let origin = CGPoint(x: location.x - radius, y: location.y - radius)
        path = UIBezierPath(ovalIn: CGRect(origin: origin, size: CGSize(width: radius * 2, height: radius * 2))).cgPath
    }
}

private var handle: UInt8 = 0

extension UIBarButtonItem {
    private var badgeLayer: CAShapeLayer? {
        if let b: AnyObject = objc_getAssociatedObject(self, &handle) as AnyObject? {
            return b as? CAShapeLayer
        } else {
            return nil
        }
    }

    func addBadge(number: Int, withOffset offset: CGPoint = CGPoint.zero, andColor color: UIColor = UIColor.red, andFilled filled: Bool = true) {
        guard let view = self.value(forKey: "view") as? UIView else { return }

        badgeLayer?.removeFromSuperlayer()

        // Initialize Badge
        let badge = CAShapeLayer()
        let radius = CGFloat(7)
        let location = CGPoint(x: view.frame.width - (radius + offset.x), y: (radius + offset.y))
        badge.drawCircleAtLocation(location: location, withRadius: radius, andColor: color, filled: filled)
        view.layer.addSublayer(badge)

        // Initialiaze Badge's label
        let label = CATextLayer()
        label.string = "\(number)"
        label.alignmentMode = kCAAlignmentCenter
        label.fontSize = 11
        label.frame = CGRect(origin: CGPoint(x: location.x - 4, y: offset.y), size: CGSize(width: 8, height: 16))
        label.foregroundColor = filled ? UIColor.white.cgColor : color.cgColor
        label.backgroundColor = UIColor.clear.cgColor
        label.contentsScale = UIScreen.main.scale
        badge.addSublayer(label)

        // Save Badge as UIBarButtonItem property
        objc_setAssociatedObject(self, &handle, badge, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
    }

    func updateBadge(number: Int) {
        if let text = badgeLayer?.sublayers?.filter({ $0 is CATextLayer }).first as? CATextLayer {
            text.string = "\(number)"
        }
    }

    func removeBadge() {
        badgeLayer?.removeFromSuperlayer()
    }
}

这个伟大的代码由Stefano Vettor创建,您可以在以下网址找到所有详细信息:https: //gist.github.com/freedom27/c709923b163e26405f62b799437243f4

Answer 2

工作解决方案：

步骤1： 首先创建新的swift文件，该文件是UIButton的子类，如下所示：

import UIKit

class BadgeButton: UIButton {

    var badgeLabel = UILabel()

    var badge: String? {
        didSet {
            addbadgetobutton(badge: badge)
        }
    }

    public var badgeBackgroundColor = UIColor.red {
        didSet {
            badgeLabel.backgroundColor = badgeBackgroundColor
        }
    }

    public var badgeTextColor = UIColor.white {
        didSet {
            badgeLabel.textColor = badgeTextColor
        }
    }

    public var badgeFont = UIFont.systemFont(ofSize: 12.0) {
        didSet {
            badgeLabel.font = badgeFont
        }
    }

    public var badgeEdgeInsets: UIEdgeInsets? {
        didSet {
            addbadgetobutton(badge: badge)
        }
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        addbadgetobutton(badge: nil)
    }

    func addbadgetobutton(badge: String?) {
        badgeLabel.text = badge
        badgeLabel.textColor = badgeTextColor
        badgeLabel.backgroundColor = badgeBackgroundColor
        badgeLabel.font = badgeFont
        badgeLabel.sizeToFit()
        badgeLabel.textAlignment = .center
        let badgeSize = badgeLabel.frame.size

        let height = max(18, Double(badgeSize.height) + 5.0)
        let width = max(height, Double(badgeSize.width) + 10.0)

        var vertical: Double?, horizontal: Double?
        if let badgeInset = self.badgeEdgeInsets {
            vertical = Double(badgeInset.top) - Double(badgeInset.bottom)
            horizontal = Double(badgeInset.left) - Double(badgeInset.right)

            let x = (Double(bounds.size.width) - 10 + horizontal!)
            let y = -(Double(badgeSize.height) / 2) - 10 + vertical!
            badgeLabel.frame = CGRect(x: x, y: y, width: width, height: height)
        } else {
            let x = self.frame.width - CGFloat((width / 2.0))
            let y = CGFloat(-(height / 2.0))
            badgeLabel.frame = CGRect(x: x, y: y, width: CGFloat(width), height: CGFloat(height))
        }

        badgeLabel.layer.cornerRadius = badgeLabel.frame.height/2
        badgeLabel.layer.masksToBounds = true
        addSubview(badgeLabel)
        badgeLabel.isHidden = badge != nil ? false : true
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.addbadgetobutton(badge: nil)
        fatalError("init(coder:) is not implemented")
    }
}

步骤2： 在基本文件中创建一个函数，您可以在每个View Controller中使用该函数：

  func addBadge(itemvalue: String) {

        let bagButton = BadgeButton()
        bagButton.frame = CGRect(x: 0, y: 0, width: 44, height: 44)
        bagButton.tintColor = UIColor.darkGray
        bagButton.setImage(UIImage(named: "ShoppingBag")?.withRenderingMode(.alwaysTemplate), for: .normal)
        bagButton.badgeEdgeInsets = UIEdgeInsets(top: 20, left: 0, bottom: 0, right: 15)
        bagButton.badge = itemvalue
        self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: bagButton)
    }

第3步： 以这种方式在任何View Controller中使用上述功能：

self.addBadge(itemvalue: localStorage.string(forKey: "total_products_in_cart") ?? "0")

Answer 3

首先创建标签，然后右栏按钮。在右侧栏按钮上添加子视图，这将是徽章计数。最后添加导航右栏按钮。

快速 5

let badgeCount = UILabel(frame: CGRect(x: 22, y: -05, width: 20, height: 20))
badgeCount.layer.borderColor = UIColor.clear.cgColor
badgeCount.layer.borderWidth = 2
badgeCount.layer.cornerRadius = badgeCount.bounds.size.height / 2
badgeCount.textAlignment = .center
badgeCount.layer.masksToBounds = true
badgeCount.textColor = .white
badgeCount.font = badgeCount.font.withSize(12)
badgeCount.backgroundColor = .red
badgeCount.text = "4"


let rightBarButton = UIButton(frame: CGRect(x: 0, y: 0, width: 35, height: 35))
rightBarButton.setBackgroundImage(UIImage(named: "NotificationBell"), for: .normal)
rightBarButton.addTarget(self, action: #selector(self.onBtnNotification), for: .touchUpInside)
rightBarButton.addSubview(badgeCount)


let rightBarButtomItem = UIBarButtonItem(customView: rightBarButton)
navigationItem.rightBarButtonItem = rightBarButtomItem

Answer 4

MIBadgeButton-Swift 也适用于 UIBarButtonItems。这是创建导航栏后我的代码：

let rightBarButtons = self.navigationItem.rightBarButtonItems

let alarmsBarButton = rightBarButtons?.last

let alarmsButton = alarmsBarButton.customView as! MIBadgeButton?

alarmsButton.badgeString = "10"