导航右侧按钮样式无法全局配置

[MING10]

class EachNavigationBar line 71. 无法配置导航按钮样式 buttonAppearance无法赋值.

private lazy var appearance: UINavigationBarAppearance = {
let appearance = UINavigationBarAppearance()
appearance.backgroundColor = self.barTintColor
appearance.titleTextAttributes = self.titleTextAttributes ?? [:]
appearance.largeTitleTextAttributes = self.largeTitleTextAttributes ?? [:]

    return appearance
}()