Question

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

 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

已经尝试过子类并设置：

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 - 任何想法？

Answer 1

如果你出现QLPreviewController，根本就没有导航控制器。这样的事情可以起作用：

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
    }
}

Answer 2

您可以在子类的viewDidLayoutSubviews中执行此操作，这对我有用。

class PreviewController: QLPreviewController {

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        navigationController?.navigationBar.isTranslucent = false
    }
}

然后只需实例化新类

let previewController = PreviewController()//QLPreviewController()
previewController.dataSource = self
navigationController?.pushViewController(previewController, animated: true)

按QLPreviewController并将Translucent设置为false？

2 个答案: