如何继承 QLPreviewController 并禁用共享按钮？

Question

• 我已经完成了这样的代码，但它是开放的 QLPreviewController 但是 共享按钮未被禁用。我尝试了不同的东西，但它是 没用。

  - 或者您可以向我推荐任何其他可以禁用共享按钮的预览控制器。

• qlViewController = QLPreviewController()

• qlViewController.navigationItem.rightBarButtonItem = nil

• qlViewController.delegate = self
• qlViewController.dataSource = self

func numberOfPreviewItemsInPreviewController（控制器：QLPreviewController）-> Int { 返回 1 }

func previewController(controller: QLPreviewController, previewItemAtIndex index: Int) -> QLPreviewItem {
    controller.navigationItem.rightBarButtonItem = nil
    return fileUrlToOpen
}

Answer 1

在 iOS 15 上测试，可能会随着下次更新而改变。

QLPreviewController 现在嵌入了一个UINavigationController，然后它有一个根控制器和一个我们可以调整的标准navigationItem。

guard let navigationItem = (aQLPreviewController.children.first as? UINavigationController)?.viewControllers.first?.navigationItem else
{
    // Not iOS 15 or the QLPreviewController implementation has changed
    return
}

// Do whatever you want with the navigationItem
navigationItem.rightBarButtonItem?.isEnabled = false
// or navigationItem.rightBarButtonItem = nil

Answer 2

UPD：这不再起作用了

有一个如何隐藏右侧分享按钮的例子

final class AttachmentQuickLookVC: QLPreviewController {
    
    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()
        self.navigationItem.rightBarButtonItems = [UIBarButtonItem]()        
    }
}

另外，如果你想自定义后退按钮，你可以这样做：

final class AttachmentQuickLookVC: QLPreviewController {
    
    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()        
        let backButton = UIButton(frame: CGRect(x: 0, y: 0, width: 100, height: 35))
        
        backButton.contentEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
        backButton.contentHorizontalAlignment = .left
        backButton.setImage(UIImage(named: "ic_back"), for: .normal)

        let barButton = UIBarButtonItem(customView: backButton)
        self.navigationItem.leftBarButtonItems = [barButton]
        self.navigationItem.hidesBackButton = true
    }
}