ios - 推送 QLPreviewController 并将 Translucent 设置为 false？

Question

我无法禁用 QLPreviewController 的半透明属性。我已经尝试过:

 let preview = SideQLPreviewController()
 preview.navigationController?.navigationBar.isTranslucent = false //before
 self.navigationController?.pushViewController(preview, animated: false)
 preview.navigationController?.navigationBar.isTranslucent = false //after
 self.navigationController?.navigationBar.isTranslucent = false 

并且已经尝试子类化和设置:

class SideQLPreviewController: QLPreviewController {

override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationController?.navigationBar.isTranslucent = false
    // Do any additional setup after loading the view.
}

但仍然没有成功 - 有什么想法吗？

Answer 1

如果您提供QLPreviewController，则根本没有导航 Controller 。像这样的东西可以工作:

class PreviewController: QLPreviewController {
    var navigationBar: UINavigationBar? {
        return view.recursiveSubviews.filter({ $0 is UINavigationBar }).first as? UINavigationBar
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        navigationBar?.isTranslucent = false
    }
}

extension UIView {
    var recursiveSubviews: [UIView] {
        var recursiveSubviews: [UIView] = []
        for subview in subviews {
            recursiveSubviews.append(subview)
            recursiveSubviews.append(contentsOf: subview.recursiveSubviews)
        }
        return recursiveSubviews
    }
}