从 QLPreviewController 隐藏共享按钮

Question

我需要从 QLPreviewController 隐藏共享按钮按钮

这是将 PDF （例如）显示到新视图中的原始代码

var previewItem = NSURL()
func preview(_command: CDVInvokedUrlCommand){
 self.previewItem = fileLocationURL! as NSURL
 let previewController = QLPreviewController();
 previewController.dataSource = self;
 self.viewController?.present(previewController, animated: true, completion: nil);
}

extension PreviewAnyFile: QLPreviewControllerDataSource {
    func numberOfPreviewItems(in controller: QLPreviewController) -> Int {
        return 1
    }

    func previewController(_ controller: QLPreviewController, previewItemAt index: Int) -> QLPreviewItem {
        return self.previewItem as QLPreviewItem
    }
}

我尝试了这段代码（将 QLPreviewController 超类到 QLPreviewController 中）但共享按钮仍然存在

class QLSPreviewController : QLPreviewController {
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
    }
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(true )
        //This hides the share item
        if let add =  self.children.first as? UINavigationController {
            if let layoutContainerView  = add.view.subviews[1] as? UINavigationBar {
                 layoutContainerView.subviews[2].subviews[1].isHidden = true
            }
        }
    }
}

Answer 1

基于几个合理安全的假设：

• 您的 PDF 查看器 class 是 UIViewController 的子类
• navigationBar 来自导航 controller 并且不是手动创建的

你应该能够删除 UBarButtonItem

从 ViewDidLoad 内部：

navigationItem.rightBarButtonItems = []

或从 class 外部（如果需要）：

myPDFViewController.navigationItem.rightBarButtonItems = []

Answer 2

子类化 QLPreviewController 并覆盖viewWillLayoutSubviews ：

class PicturePreviewViewController: QLPreviewController {
        
       override func viewWillLayoutSubviews() {
          super.viewWillLayoutSubviews()
                        
          // Hide share button.
          if let navigationController = children.first as? UINavigationController,
          let shareItem = navigationController.toolbar.items?.first as? UIBarButtonItem {
             shareItem.isEnabled = false
             shareItem.tintColor = .clear
          }
       }        
}