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()
    }
}

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

Answer 2

工作方案：

步骤1：首先创建新的swift文件，它是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可以在每个View Controller中使用的函数：

  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)
    }

步骤3：以这种方式从任何View Controller使用上述功能：

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

Answer 3

使用M13BadgeView ..使用此代码

（即时通讯使用fontawesome.swift按钮:: https://github.com/thii/FontAwesome.swift）

    let rightButton = UIButton(frame: CGRect(x:0,y:0,width:30,height:30))
    rightButton.titleLabel?.font = UIFont.fontAwesome(ofSize: 22)
    rightButton.setTitle(String.fontAwesomeIcon(name: .shoppingBasket), for: .normal)

    let rightButtonItem : UIBarButtonItem = UIBarButtonItem(customView: rightButton)

    let badgeView = M13BadgeView()
        badgeView.text = "1"
        badgeView.textColor = UIColor.white
        badgeView.badgeBackgroundColor = UIColor.red
        badgeView.borderWidth = 1.0
        badgeView.borderColor = UIColor.white
        badgeView.horizontalAlignment = M13BadgeViewHorizontalAlignmentLeft
        badgeView.verticalAlignment = M13BadgeViewVerticalAlignmentTop
        badgeView.hidesWhenZero = true

    rightButton.addSubview(badgeView)

    self.navigationItem.rightBarButtonItem = rightButtonItem

Answer 4

我有同样的任务。我不想使用第三方库。首先，我尝试了Stefano's solution并且它很棒但是我决定用自己的方式来解决它。

在我看来，简单的步骤如下：

1. 在UIView文件中创建.xib实例，并根据您的设计要求放置UILabel或UIImageView实例等必要的项目。

我在这一步中做的最后一步是在视图层次结构的顶部放置一个隐形按钮。

2. 创建YourCustomView.swift并将@IBOutlets中的所有xib链接到自定义视图类实现中的当前文件。

3. 接下来，在YourCustomView类中实现类函数，它将从xib加载自定义视图并将其作为YourCustomView实例返回。

4. 最后，将自定义徽章添加到自定义视图控制器实例！

我的结果是......

附：如果您需要实现@IBActions，我建议您通过委托模式链接自定义视图和自定义视图控制器。

Answer 5

很好的答案@Julio Bailon（https://stackoverflow.com/a/45948819/1898973）！

以下是作者的网站上的完整解释：http://www.stefanovettor.com/2016/04/30/adding-badge-uibarbuttonitem/。

它似乎不适用于iOS 11，可能是因为该脚本试图访问UIBarButtonItem的“view”属性。我做到了：

1. 通过创建一个UIButton，然后使用UIBarButtonItem作为customView创建UIButton：

   navigationItem.rightBarButtonItem = UIBarButtonItem.init(
           customView: shoppingCartButton)

2. 通过替换UIBarButtonItem扩展中的行： guard let view = self.value(forKey: "view") as? UIView else { return } 以下内容： guard let view = self.customView else { return }

对我来说似乎很优雅，最重要的是，它起作用了！

Answer 6

你可以在UILabel下面设置UIButton的约束

对齐UILabel的顶部和尾随UIButton

当你需要向UILabel展示徽章集文本时，如果你不想显示徽章，那么将空字符串设置为UILabel

Answer 7

Download This

对于BarButtonItem：在项目中拖放UIBarButtonItem + Badge.h和UIBarButtonItem + Badge.m类。

为set徽章写下这段代码：

self.navigationItem.rightBarButtonItem.badgeValue = "2"
self.navigationItem.rightBarButtonItem.badgeBGColor = UIColor.black

对于UIButtton：在项目中拖放UIButton + Badge.h和UIButton + Badge.m类。

self.notificationBtn.badgeValue = "2"
self.notificationBtn.badgeBGColor = UIColor.black

Answer 8

MIBadgeButton-Swift也在UIBarButtonItems上工作。以下是创建导航栏后的代码：

let rightBarButtons = self.navigationItem.rightBarButtonItems

let alarmsBarButton = rightBarButtons?.last

let alarmsButton = alarmsBarButton.customView as! MIBadgeButton?

alarmsButton.badgeString = "10"

Answer 9

你可以用编程方式完成

self.tabBarItem.badgeColor = .red

或使用故事板。看到：