changenavlabel.swift

for navsubview in (navigationController?.navigationBar.subviews ?? []) {
    let classname = NSStringFromClass(type(of: navsubview))
    guard classname.hasSuffix("View") && classname.hasPrefix("UINavigationItem") else { continue }
    for labelView in navsubview.subviews where labelView is UILabel {
        (labelView as! UILabel).textColor = .red
    }
}