swift – UIDocumentPicker导航栏按钮隐藏在iOS 11中

我在iOS 11的UIDocumentPicker导航栏中发现问题,完成,取消或编辑按钮是不可见的,当用户触摸它时,即使更改UINavigationBar.appearnce(即使更改UINavigationBar.appearnce时),正常状态下的颜色也是白色. ).tintColor,颜色仅在触摸时改变.

解决方法

对UINavigationBar和UIBarButtonItem使用带有黑色外观的CustomDocumentPickerViewController

import UIKit

class 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)

    }

}