Badge icon, how to do?

Question

Swift

I have a database of orders, which are displayed in the most common table view through customCell. The output is sorted by date.
Task: make the badge icon display the number of orders for today. This means this is a red circle with numbers in which it is usually displayed, for example, how many letters are unread or how many messages are unread in vatsap, for example. Here you also need to display the number of orders for today. Well, how the order was deleted - so that the number is updated. But regardless of whether the order entered or not, as long as it is not deleted and it has today's date, it is also considered. Please help, thanks)

Answer 1

Thank you all very much, here is the solution (this code is in VC):
let badgeCount: Int = 777
let application = UIApplication.shared
let center = UNUserNotificationCenter.current()
center.requestAuthorization(options:[.badge, .alert, .sound ]) { (granted, error) in }
application.registerForRemoteNotifications()
application.applicationIconBadgeNumber = badgeCount
But the code just outputs the number I specified.
Tell me how to calculate how many orders I have (well, that is, how many cells) for which the date coincides with today. That is, help with the code where let badgeCount: Int = how many orders have today's date.
date is displayed like this:
let dateString = dateFormatter.string(from: zakaz.zakazDate!)
cell.detailTextLabel?.text = dateString
or at least how to count how many orders there are for the entire table wiew?

Answer 2

I did something like this: (Maybe you can do better, maybe something ready is already there. For the sake of interest, I tried to do it myself)

class IconView: UIView {
    var color: UIColor = .clear
    var iconText: UILabel?
    var popular: Datas.Popular?
    var result: Result?

    init(popular: Datas.Popular) {
        super.init(frame: .zero)
        initialize(with: popular)
    }

    init(result: Result) {
        super.init(frame: .zero)
        initializeResult(with: result)
    }

    // В принципе он тут не нужен вообще
    override init(frame: CGRect) {
        super.init(frame: frame)
        initialize()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        initialize()
    }

    private func initialize(with popular: Datas.Popular? = nil) {
        self.popular = popular
        translatesAutoresizingMaskIntoConstraints = false
        isOpaque = false
        backgroundColor = .none
        contentMode = .center

        guard !(popular?.new == false && popular?.newPrice == nil) else { return }
        if let isNew = popular?.new, isNew {
            color = #colorLiteral(red: 0.5411764706, green: 0.6862745098, blue: 0.3411764706, alpha: 1)
        } else {
            color = #colorLiteral(red: 1, green: 0.1491314173, blue: 0, alpha: 1)
        }

        var percent = Int()
        if let stringWithNewPrice = popular?.newPrice, let stringWithOldPrice = popular?.price,
            let newPrice = Int(stringWithNewPrice.removingWhitespaces()),
            let oldPrice = Int(stringWithOldPrice.removingWhitespaces()) {
            percent = Int(((oldPrice - newPrice) * 100) / oldPrice)
        }

        iconText = UILabel()
        iconText?.text = (popular?.new)! ? "new" : "-\(percent)%"
        iconText?.textColor = .white
        iconText?.font = iconText?.font.withSize(8.5)
        iconText?.isOpaque = false
        iconText?.backgroundColor = .none
        iconText?.frame.size = CGSize.zero
        iconText?.sizeToFit()
        addSubview(iconText!)
        iconText?.translatesAutoresizingMaskIntoConstraints = false
        iconText?.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true
        iconText?.centerYAnchor.constraint(equalTo: centerYAnchor).isActive = true
    }

    private func initializeResult(with result: Result? = nil) {
        self.result = result
        translatesAutoresizingMaskIntoConstraints = false
        isOpaque = false
        backgroundColor = .none
        contentMode = .center

        guard !(result?.isNew == false && result?.oldPriceAmount == "") else { return }
        if let isNew = result?.isNew, isNew {
            color = #colorLiteral(red: 0.5411764706, green: 0.6862745098, blue: 0.3411764706, alpha: 1)
        } else {
            color = #colorLiteral(red: 1, green: 0.1491314173, blue: 0, alpha: 1)
        }

        var percent = Int()
        if let stringWithNewPrice = result?.priceAmount, let stringWithOldPrice = result?.oldPriceAmount,
            let newPrice = Double(stringWithNewPrice),
            let oldPrice = Double(stringWithOldPrice) {
            percent = Int(((oldPrice - newPrice) * 100) / oldPrice)
        }

        contentMode = .redraw
        iconText = UILabel()
        iconText?.text = (result?.isNew)! ? "new" : "-\(percent)%"
        iconText?.textColor = .white
        iconText?.font = iconText?.font.withSize(8.5)
        iconText?.isOpaque = false
        iconText?.backgroundColor = .none
        iconText?.frame.size = CGSize.zero
        iconText?.sizeToFit()
        addSubview(iconText!)
        iconText?.translatesAutoresizingMaskIntoConstraints = false
        iconText?.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true
        iconText?.centerYAnchor.constraint(equalTo: centerYAnchor).isActive = true
    }

    override func draw(_ rect: CGRect) {
        guard !(popular?.new == false && popular?.newPrice == nil) else { return }

        let circle = UIBezierPath(
            arcCenter: CGPoint(x: bounds.midX, y: bounds.midY),
            radius: 10,
            startAngle: 0,
            endAngle: 2 * CGFloat.pi,
            clockwise: true
        )
        circle.addClip()
        color.setFill()
        circle.fill()
    }
}

In the class of the cell itself:

private func updateUI() {
        previewImage.image = popular.image
        price.text = popular.price
        name.text = popular.name
        novelty = IconView(popular: popular)

        addSubview(novelty)
        let guide = layoutMarginsGuide
        novelty.topAnchor.constraintEqualToSystemSpacingBelow(guide.topAnchor, multiplier: 1).isActive = true
        novelty.leadingAnchor.constraintEqualToSystemSpacingAfter(guide.leadingAnchor, multiplier: 1).isActive = true
        novelty.widthAnchor.constraint(equalToConstant: 20).isActive = true
        novelty.heightAnchor.constraint(equalToConstant: 20).isActive = true
    }

Answer 3

Look here in Russian, maybe it will help:
https://youtu.be/Dvhdnt12rZA