A function that creates a _UIViewGlass object with the correctly numbered variant. All in swift!

_UIViewGlass.swift

public func _UIViewGlass(variant: Int) -> NSObject? {
    let glassClass = objc_lookUpClass("_UIViewGlass")! as AnyObject
    let glass = glassClass._alloc()._init(variant: variant)
    return glass as? NSObject
}

/// Registers Objective-C methods Swift needs.
fileprivate final class PrivateSelectors: NSObject {

    @objc(alloc)
    func _alloc() -> AnyObject {
        fatalError("Do not call")
    }

    @objc(initWithVariant:)
    func _init(variant: Int) -> AnyObject {
        fatalError("Do not call")
    }
}