Get All SubClass Name in your App

GetSubClass.swift

func allSubClass<T>(of targetClass: T, bundle: Bundle) -> [T] {
    var count: UInt32 = 0
    guard let allClasses = objc_copyClassList(&count) else {
        return []
    }

    let targetClasses: [T] = (0..<count).compactMap { index in
        let someClass: AnyClass = allClasses[Int(index)]

        guard Bundle(for: someClass) == bundle else { return nil }
        guard let someSuperClass = class_getSuperclass(someClass) else { return nil }
        guard String(describing: someSuperClass) == String(describing: targetClass) else { return nil }

        return someClass as? T
    }
    return targetClasses
}

// usage
let vc = allSubClass(of: UIViewController.self, bundle: Bundle.main)
let nav = allSubClass(of: UINavigationController.self, bundle: Bundle.main)