解决方法 对UINavigationbar和UIbarbuttonItem使用带有黑色外观的CustomdocumentPickerVIEwController
import UIKitclass CustomdocumentPickerVIEwController: UIdocumentPickerVIEwController { overrIDe func vIEwWillAppear(_ animated: Bool) { super.vIEwWillAppear(animated) UINavigationbar.appearance().tintcolor = UIcolor.black UIbarbuttonItem.appearance().setTitleTextAttributes([NSForegroundcolorAttributename : UIcolor.black],for: .normal) } overrIDe func vIEwWilldisappear(_ animated: Bool) { UINavigationbar.appearance().tintcolor = UIcolor.white // your color UIbarbuttonItem.appearance().setTitleTextAttributes(nil,for: .normal) super.vIEwWilldisappear(animated) }}总结
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