niczyja

lazy var persistentContainer: NSPersistentContainer = {
    let container = NSPersistentContainer(name: "app container name")
    
    guard let fileContainer = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "your group.app.identifier") else {
        fatalError("Shared file container could not be created.")
    }
    let groupStoreUrl = fileContainer.appendingPathComponent("app container name.sqlite")

    let hasOldStore = FileManager.default.fileExists(atPath: container.persistentStoreDescriptions.first?.url?.path ?? "")
    let needsMigration = hasOldStore && container.persistentStoreDescriptions.first?.url?.absoluteString != groupStoreUrl.absoluteString

niczyja

extension CGMutablePath {

    func addArrow(to point: CGPoint, tailWidth: CGFloat = 4.0, headWidth: CGFloat = 10.0, headLength: CGFloat = 14.0) {
        let length = hypot(point.x - currentPoint.x, point.y - currentPoint.y)
        let tailLength = length - headLength

        let points: [CGPoint] = [
            CGPoint(x: 0.0, y: tailWidth / 2),
            CGPoint(x: tailLength, y: tailWidth / 2),
            CGPoint(x: tailLength, y: headWidth / 2),

niczyja

import UIKit

extension UIButton {
    
    @IBInspectable var disabledBackgroundColor: UIColor? {
        get {
            guard let image = image(for: .disabled) else { return nil }
            return UIColor(patternImage: image)
        }
        set { setBackgroundColor(newValue, for: .disabled) }