How to prevent to open title menu of QLPreviewController - Xamarin.Forms iOS?

Question

How to prevent to open title menu of QLPreviewController - Xamarin.Forms iOS?

Pelin Konaray 291

Hello,

I open a file using the QLPreviewController to preview it from within the Xamarin.Forms iOS app.
I turn off the "Open In" button to prevent the file from being exported to the application in QLPreviewController. However, after the latest iOS update on my test device (iPad), I saw that when the title in the Navigation bar is pressed, a menu opens and the "Open In" option is shown there.

How do I turn this off?

Accepted answer

3 additional answers

Your answer

Answer 1

Hello,

Normally (before updating iOS) you could turn off sharing by customizing the rightBarButtonItem of the navigationItem. I tested on iOS16, it doesn't work, and you cannot disable leftBarButtonItem and rightBarButtonItem. I try to get the navigationBar.Items[0].LeftBarButtonItems, the children could not be evaluated.

Currently, you can create a new UIViewController and add the view of QLPreviewController to the UIViewController , then present this UIViewController, please refer to the following code:

---Update---

            UIViewController customVC = new UIViewController();  
            customVC.View.BackgroundColor = UIColor.White;  
            PdfPreviewController previewController = new PdfPreviewController();  
            previewController.DataSource = new MyQLPreviewControllerDataSource();// add if (File.Exists(file)) according to your needs  
            customVC.AddChildViewController(previewController);  

            previewController.View.Frame = new CoreGraphics.CGRect(0, 0, UIScreen.MainScreen.Bounds.Width, UIScreen.MainScreen.Bounds.Height);// 20 is y of done button , 40 is height of done button  
            customVC.View.AddSubview(previewController.View);// add QLPreviewController.view to this customVC  
            UIButton doneButton = UIButton.FromType(UIButtonType.System);  
            doneButton.Frame = new CGRect(UIScreen.MainScreen.Bounds.Width - 40, 20, 40, 40);  
            doneButton.SetTitle("Done", UIControlState.Normal);  
            doneButton.TouchUpInside += delegate  
            {  
                customVC.DismissModalViewController(true);// dismiss the customVC  
            };  
            ;//add done button on the viewcontroller  
            customVC.View.AddSubview(doneButton);  
            customVC.ModalPresentationStyle = UIModalPresentationStyle.FullScreen;  

            UIApplication.SharedApplication.KeyWindow.RootViewController.PresentViewController(customVC, true, null);

Best Regards,
Wenyan Zhang

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Answer 2

Puneet Arora 11

Just set titlemenuprovider and documentproperties to nil in viewdidappear.
Apple and introduced these two new properties from iOS 16. It will hide the titlemenu from previewcontroller.

if (@available(iOS 16.0, *)) {
        self.navigationItem.titleMenuProvider = nil;
        self.navigationItem.documentProperties = nil;
    }

Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff

2023-04-14T08:21:52.3233333+00:00

Thanks for your sharing.

Answer 3

Hello @Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) ,

Thanks for reply. I tried your suggestion but UI is a bit confused like this:

Default done and share button don't closed and added our custom button to ui. I think I didn't implemented it correctly. Could you help me for this?

The implementation I made to turn off the share button:

using App.Helpers;  
using App.iOS.CustomRenderer;  
using App.Models;  
using App.Views;  
using Foundation;  
using QuickLook;  
using System;  
using System.IO;  
using System.Linq;  
using UIKit;  
using Xamarin.Forms;  
  
[assembly: Dependency(typeof(DocumentView))]  
namespace App.iOS.CustomRenderer  
{  
    public class DocumentView : DocumentViewBase, IDocumentView  
    {  
        void IDocumentView.DocumentView(string file, string title)  
        {  
            try  
            {  
                if (VideoAudioControl(file))  
                {  
                    OpenVideoAudioPreview(file, title);  
                }  
                else  
                {  
                    UIApplication.SharedApplication.InvokeOnMainThread(() =>  
                    {  
                        PdfPreviewController previewController = new PdfPreviewController();  
  
                        if (File.Exists(file))  
                        {  
                            previewController.DataSource = new PDFPreviewControllerDataSource(NSUrl.FromFilename(file), title);  
                            UIApplication.SharedApplication.KeyWindow.RootViewController.PresentViewController(previewController, true, null);  
                        }  
                        MessagingCenter.Send("ClosePreviewPopup", "ClosePreviewPopup");  
                    });  
                }  
            }  
            catch (Exception ex)  
            {  
                Helper.Log(ex, "IDocumentView.DocumentView", "DocumentView", "IDocumentView.DocumentView(string file, string title)");  
            }  
        }  
    }  
  
    public class PDFItem : QLPreviewItem  
    {  
        public PDFItem(string title, NSUrl uri)  
        {  
            this.Title = title;  
            this.Url = uri;  
        }  
        public string Title { get; set; }  
        public NSUrl Url { get; set; }  
        public override NSUrl ItemUrl { get { return Url; } }  
        public override string ItemTitle { get { return Title; } }  
    }  
  
    public class PDFPreviewControllerDataSource : QLPreviewControllerDataSource  
    {  
        PDFItem[] sources;  
  
        public PDFPreviewControllerDataSource(NSUrl url, string filename)  
        {  
            sources = new PDFItem[1];  
            sources[0] = new PDFItem(filename, url);  
        }  
  
        public override IQLPreviewItem GetPreviewItem(QLPreviewController controller, nint index)  
        {  
            int idx = int.Parse(index.ToString());  
            if (idx < sources.Length)  
                return sources.ElementAt(idx);  
            return null;  
        }  
  
        public override nint PreviewItemCount(QLPreviewController controller)  
        {  
            return (nint)sources.Length;  
        }  
    }  
}  

using CoreGraphics;  
using App.AppConfigManager.Models;  
using Foundation;  
using MaterialComponents;  
using QuickLook;  
using System;  
using System.Linq;  
using UIKit;  
using Xamarin.Forms;  
using static System.Net.Mime.MediaTypeNames;  
  
namespace App.iOS.CustomRenderer  
{  
    public class PdfPreviewController : QLPreviewController  
    {  
        public PdfPreviewController()  
        {  
            var aaa = this.NavigationItem;  
        }  
  
        public override void ViewWillAppear(bool animated)  
        {  
            base.ViewWillAppear(animated);  
  
            try  
            {  
                BeginInvokeOnMainThread(() =>  
                {  
                    ActionMenuControl();  
                });  
            }  
            catch (Exception ex)  
            {  
                Helpers.Helper.Log(ex, "ViewWillAppear", "App.iOS.CustomRenderer.PdfPreviewController", "ViewWillAppear(bool animated)");  
            }  
        }  
  
        public override void ViewWillLayoutSubviews()  
        {  
            base.ViewWillLayoutSubviews();  
  
            try  
            {  
                BeginInvokeOnMainThread(() =>  
                {  
                    ActionMenuControl();  
                });  
            }  
            catch (Exception ex)  
            {  
                Helpers.Helper.Log(ex, "ViewWillLayoutSubviews", "App.iOS.CustomRenderer.PdfPreviewController", "ViewWillLayoutSubviews()");  
            }  
        }  
  
        public override void ViewDidLayoutSubviews()  
        {  
            base.ViewDidLayoutSubviews();  
  
            try  
            {  
                BeginInvokeOnMainThread(() =>  
                {  
                    ActionMenuControl();  
                });  
            }  
            catch (Exception ex)  
            {  
                Helpers.Helper.Log(ex, "ViewDidLayoutSubviews", "App.iOS.CustomRenderer.PdfPreviewController", "ViewDidLayoutSubviews()");  
            }  
        }  
  
        public override void ViewDidAppear(bool animated)  
        {  
            base.ViewDidAppear(animated);  
  
            try  
            {  
                BeginInvokeOnMainThread(() =>  
                {  
                    ActionMenuControl();  
                });  
            }  
            catch (Exception ex)  
            {  
                Helpers.Helper.Log(ex, "ViewDidAppear", "App.iOS.CustomRenderer.PdfPreviewController", "ViewDidAppear()");  
            }  
        }  
  
        public override void SetNeedsStatusBarAppearanceUpdate()  
        {  
            base.SetNeedsStatusBarAppearanceUpdate();  
  
            try  
            {  
                BeginInvokeOnMainThread(() =>  
                {  
                    ActionMenuControl();  
                });  
            }  
            catch (Exception ex)  
            {  
                Helpers.Helper.Log(ex, "SetNeedsStatusBarAppearanceUpdate", "App.iOS.CustomRenderer.PdfPreviewController", "SetNeedsStatusBarAppearanceUpdate()");  
            }  
        }  
  
        public void ActionMenuControl()  
        {  
            try  
            {  
                if (this.ChildViewControllers != null)  
                {  
                    if (this.ChildViewControllers.Length != 0)  
                    {  
                        try  
                        {  
                            foreach (UINavigationController navigationController in this.ChildViewControllers.Where(x => x is UINavigationController))  
                            {  
                                try  
                                {  
                                    if (navigationController.View.Subviews != null)  
                                    {  
                                        if (navigationController.View.Subviews.Length != 0)  
                                        {  
                                            try  
                                            {  
                                                foreach (UINavigationBar navigationBar in navigationController.View.Subviews.Where(x => x is UINavigationBar))  
                                                {  
                                                    if (navigationBar != null)  
                                                    {  
                                                        if (navigationBar.Items != null)  
                                                        {  
                                                            if (navigationBar.Items.Length != 0)  
                                                            {  
                                                                if (navigationBar.Items[0].RightBarButtonItems != null)  
                                                                {  
                                                                    if (navigationBar.Items[0].RightBarButtonItems.Length != 0)  
                                                                    {  
                                                                        for (int i = 0; i < navigationBar.Items[0].RightBarButtonItems.Length; i++)  
                                                                        {  
                                                                            try  
                                                                            {  
                                                                                string name = navigationBar.Items[0].RightBarButtonItems[i].Action?.Name;  
  
                                                                                if (name == "_doneButtonTapped:")  
                                                                                    continue;  
  
                                                                                if (name == "_toolbarButtonPressed:")  
                                                                                {  
                                                                                    string image1 = navigationBar.Items[0].RightBarButtonItems[i].Image.ToString();  
                                                                                    if (image1.Contains("symbol(system: rectangle.and.pencil.and.ellipsis)"))  
                                                                                        continue;  
  
                                                                                    string image2 = navigationBar.Items[0].RightBarButtonItems[i].Image.ToString();  
                                                                                    if (image2.Contains("symbol(system: magnifyingglass)"))  
                                                                                        continue;  
                                                                                }  
                                                                                  
                                                                            }  
                                                                            catch (Exception ex)  
                                                                            {  
                                                                                Helpers.Helper.Log(ex, "_doneButtonTapped control error", "App.iOS.CustomRenderer.PdfPreviewController", "_doneButtonTapped control error");  
                                                                            }  
  
                                                                            navigationBar.Items[0].RightBarButtonItems[i].Enabled = false;  
  
                                                                            if (navigationBar.Items[0].RightBarButtonItems.Length > 1)  
                                                                            {  
                                                                                foreach (UIBarButtonItem item in navigationBar.Items[0].RightBarButtonItems.Where(x => x.AccessibilityIdentifier == "QLOverlayMarkupButtonAccessibilityIdentifier"))  
                                                                                {  
                                                                                    item.Enabled = false;  
                                                                                }  
                                                                            }  
                                                                        }  
                                                                    }  
                                                                }  
                                                            }  
                                                        }  
                                                    }  
                                                }  
                                            }  
                                            catch (Exception ex)  
                                            { Helpers.Helper.Log(ex, "ActionMenuControl", "App.iOS.CustomRenderer.PdfPreviewController", "ActionMenuControl()"); }  
  
                                            try  
                                            {  
                                                foreach (UIToolbar subview in navigationController.View.Subviews.Where(x => x is UIToolbar))  
                                                {  
                                                    if (subview.Items != null)  
                                                    {  
                                                        if (subview.Items.Length != 0)  
                                                        {  
                                                            foreach (UIBarButtonItem item in subview.Items.Where(x => x.AccessibilityIdentifier == "QLOverlayDefaultActionButtonAccessibilityIdentifier"))  
                                                            {  
                                                                try  
                                                                {  
                                                                    string name = item.Action?.Name;  
  
                                                                    if (name == "_doneButtonTapped:")  
                                                                        continue;  
  
                                                                    if (name == "_toolbarButtonPressed:")  
                                                                    {  
                                                                        string image1 = item.Image?.ToString();  
                                                                        if (image1.Contains("symbol(system: rectangle.and.pencil.and.ellipsis)"))  
                                                                            continue;  
  
                                                                        string image2 = item.Image?.ToString();  
                                                                        if (image2.Contains("symbol(system: magnifyingglass)"))  
                                                                            continue;  
                                                                    }  
                                                                      
                                                                }  
                                                                catch (Exception ex)  
                                                                {  
                                                                    Helpers.Helper.Log(ex, "_doneButtonTapped control error", "App.iOS.CustomRenderer.PdfPreviewController", "_doneButtonTapped control error");  
                                                                }  
  
                                                                item.Enabled = false;  
                                                            }  
                                                        }  
                                                    }  
                                                }  
                                            }  
                                            catch (Exception ex)  
                                            { Helpers.Helper.Log(ex, "ActionMenuControl", "App.iOS.CustomRenderer.PdfPreviewController", "ActionMenuControl()"); }  
                                        }  
                                    }  
                                }  
                                catch (Exception ex)  
                                { Helpers.Helper.Log(ex, "ActionMenuControl", "App.iOS.CustomRenderer.PdfPreviewController", "ActionMenuControl()"); }  
  
                                try  
                                {  
                                    if (navigationController.Toolbar != null)  
                                    {  
                                        if (navigationController.Toolbar.Items != null)  
                                        {  
                                            if (navigationController.Toolbar.Items.Length != 0)  
                                            {  
                                                foreach (UIBarButtonItem item in navigationController.Toolbar.Items.Where(x => x.AccessibilityIdentifier == "QLOverlayDefaultActionButtonAccessibilityIdentifier"))  
                                                {  
                                                    try  
                                                    {  
                                                        string name = item.Action?.Name;  
  
                                                        if (name == "_doneButtonTapped:")  
                                                            continue;  
  
                                                        if (name == "_toolbarButtonPressed:")  
                                                        {  
                                                            string image1 = item.Image?.ToString();  
                                                            if (image1.Contains("symbol(system: rectangle.and.pencil.and.ellipsis)"))  
                                                                continue;  
  
                                                            string image2 = item.Image?.ToString();  
                                                            if (image2.Contains("symbol(system: magnifyingglass)"))  
                                                                continue;  
                                                        }  
                                                          
                                                    }  
                                                    catch (Exception ex)  
                                                    {  
                                                        Helpers.Helper.Log(ex, "_doneButtonTapped control error", "App.iOS.CustomRenderer.PdfPreviewController", "_doneButtonTapped control error");  
                                                    }  
  
                                                    item.Enabled = false;  
                                                }  
                                            }  
                                        }  
                                    }  
                                }  
                                catch (Exception ex)  
                                { Helpers.Helper.Log(ex, "ActionMenuControl", "App.iOS.CustomRenderer.PdfPreviewController", "ActionMenuControl()"); }  
                            }  
                        }  
                        catch (Exception ex)  
                        { Helpers.Helper.Log(ex, "ActionMenuControl", "App.iOS.CustomRenderer.PdfPreviewController", "ActionMenuControl()"); }  
                    }  
                }  
            }  
            catch (Exception ex)  
            {  
                Helpers.Helper.Log(ex, "ActionMenuControl", "App.iOS.CustomRenderer.PdfPreviewController", "ActionMenuControl()");  
            }  
        }  
    }  
}

After your suggestion I did this:

using App.Helpers;  
using App.iOS.CustomRenderer;  
using App.Models;  
using App.Views;  
using Foundation;  
using QuickLook;  
using System;  
using System.IO;  
using System.Linq;  
using UIKit;  
using Xamarin.Forms;  
  
[assembly: Dependency(typeof(DocumentView))]  
namespace App.iOS.CustomRenderer  
{  
    public class DocumentView : DocumentViewBase, IDocumentView  
    {  
        void IDocumentView.DocumentView(string file, string title)  
        {  
            try  
            {  
                if (VideoAudioControl(file))  
                {  
                    OpenVideoAudioPreview(file, title);  
                }  
                else  
                {  
                    UIApplication.SharedApplication.InvokeOnMainThread(() =>  
                    {  
                        PdfPreviewController previewController = new PdfPreviewController(file, title);  
  
                        if (File.Exists(file))  
                        {  
                            previewController.DataSource = new PDFPreviewControllerDataSource(NSUrl.FromFilename(file), title);  
                            UIApplication.SharedApplication.KeyWindow.RootViewController.PresentViewController(previewController, true, null);  
                        }  
                        MessagingCenter.Send("ClosePreviewPopup", "ClosePreviewPopup");  
                    });  
                }  
            }  
            catch (Exception ex)  
            {  
                Helper.Log(ex, "IDocumentView.DocumentView", "DocumentView", "IDocumentView.DocumentView(string file, string title)");  
            }  
        }  
    }  
  
    public class PDFItem : QLPreviewItem  
    {  
        public PDFItem(string title, NSUrl uri)  
        {  
            this.Title = title;  
            this.Url = uri;  
        }  
        public string Title { get; set; }  
        public NSUrl Url { get; set; }  
        public override NSUrl ItemUrl { get { return Url; } }  
        public override string ItemTitle { get { return Title; } }  
    }  
  
    public class PDFPreviewControllerDataSource : QLPreviewControllerDataSource  
    {  
        PDFItem[] sources;  
  
        public PDFPreviewControllerDataSource(NSUrl url, string filename)  
        {  
            sources = new PDFItem[1];  
            sources[0] = new PDFItem(filename, url);  
        }  
  
        public override IQLPreviewItem GetPreviewItem(QLPreviewController controller, nint index)  
        {  
            int idx = int.Parse(index.ToString());  
            if (idx < sources.Length)  
                return sources.ElementAt(idx);  
            return null;  
        }  
  
        public override nint PreviewItemCount(QLPreviewController controller)  
        {  
            return (nint)sources.Length;  
        }  
    }  
}  
  
  
using CoreGraphics;  
using App.AppConfigManager.Models;  
using Foundation;  
using MaterialComponents;  
using QuickLook;  
using System;  
using System.Linq;  
using UIKit;  
using Xamarin.Forms;  
using static System.Net.Mime.MediaTypeNames;  
  
namespace App.iOS.CustomRenderer  
{  
    public class PdfPreviewController : QLPreviewController  
    {  
        string file = "";  
        string title = "";  
        public PdfPreviewController(string file, string title)  
        {  
            this.file = file;  
            this.title = title;  
            var aaa = this.NavigationItem;  
        }  
  
        public override void ViewDidLoad()  
        {  
            base.ViewDidLoad();  
  
            UIButton clickbutton = UIButton.FromType(UIButtonType.System);  
            clickbutton.Frame = new CoreGraphics.CGRect(0, 90, 40, 40);  
            clickbutton.SetTitle("click", UIControlState.Normal);  
            View.AddSubview(clickbutton);// Add a click button for testing  
            UIViewController customVC = new UIViewController();// add a custonVC to present the QLPreviewController  
  
            // done button  
            UIButton doneButton = UIButton.FromType(UIButtonType.System);  
            doneButton.Frame = new CGRect(UIScreen.MainScreen.Bounds.Width - 40, 20, 40, 40);  
            doneButton.SetTitle("Done", UIControlState.Normal);  
            doneButton.TouchUpInside += delegate  
            {  
                customVC.DismissModalViewController(true);// dismiss the customVC  
            };  
            customVC.View.AddSubview(doneButton);//add done button on the viewcontroller  
  
            // QLPreviewController and the DataSource, you can replace it by yours  
            var vc = new QLPreviewController();  
            vc.DataSource = new PDFPreviewControllerDataSource(NSUrl.FromFilename(file), title);  
            customVC.AddChildViewController(vc);  
  
            vc.View.Frame = new CoreGraphics.CGRect(0, 0, UIScreen.MainScreen.Bounds.Width, UIScreen.MainScreen.Bounds.Height - 20 - 40);// 20 is y of done button , 40 is height of done button  
            customVC.View.AddSubview(vc.View);// add QLPreviewController.view to this customVC  
            customVC.ModalPresentationStyle = UIModalPresentationStyle.FullScreen;  
            // click the button to present   
            clickbutton.TouchUpInside += delegate  
            {  
                // present the customVC  
                this.PresentViewController(customVC, true, null);  
            };  
        }  
    }  
}

But UI mixed like above image. Could you assist me?

Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff

2023-01-05T07:03:03.907+00:00

I know why the view looks weird, the code snippets I provided is in a ViewController in Xamarin.iOS project(not by customview and customrender/dependency), you add my method in the PdfPreviewController . I will test if it works via customrenderer. Can you provide more about your DocumentView in Xamarin.Forms project? It's an interface for dependency service, right? You can replace the previewController by customVC above .

UIApplication.SharedApplication.KeyWindow.RootViewController.PresentViewController(previewController, true, null);
Pelin Konaray 291 Reputation points

2023-01-05T08:40:38.427+00:00

The structure in my app is like this:
In the application, users can download the files from the remote server to the device. The files are downloaded to the internal storage of the application. (In other words, it is downloaded to the internal storage and the file is prevented from being viewed by the user without the application.) Later, when the user opens application to preview these files, Dependency services run and the DocumentView method in the IDocumentView dependency class.

DependencyService.Get<IDocumentView>().DocumentView(filePath, filename);

The DocumentView method in the IDocumentView dependency class also calls the PdfPreviewController as seen in the code above. And I'm trying to prevent the file from being saved/sent to a place other than the application internal storage by turning off the buttons like "Open In" with the PdfPreviewController.

IDocumentView interface:
public interface IDocumentView

{ void DocumentView(string file, string title); }

The DocumentViewBase class is not very important, I check whether the file is an audio or video file according to the extension of the file in it (I open audio or video files with another viewer, but this part is not relevant to the question I asked.)

I shared the remaining code above.
I am doing this in the Xamarin.Forms project. So I used DependencyService. I didn't understand how to do it with ViewController. Can you guide on this?
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff

2023-01-05T09:54:03.183+00:00

You can create a new UIViewController and add the view of QLPreviewController to the UIViewController, please refer to my updated answer (adding the code snippets before the line of UIApplication.SharedApplication.KeyWindow.RootViewController.PresentViewController(previewController, true, null);).

Answer 4

Hello @Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) ,
This is worked for iOS 16.1 devices. Thank you very much. But I try it in the iPhone 8 iOS 15.5 simulator, there are an issue like this.

Objective-C exception thrown.  Name: NSInvalidArgumentException Reason: *** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[2]\nNative stack trace:\n\t0   CoreFoundation                      0x000000010b3cc604 __exceptionPreprocess + 242\n\t1   libobjc.A.dylib                     0x0000000110ac3a45 objc_exception_throw + 48\n\t2   CoreFoundation                      0x000000010b44dc63 _CFThrowFormattedException + 200\n\t3   CoreFoundation                      0x000000010b458137 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:].cold.5 + 0\n\t4   CoreFoundation                      0x000000010b43a928 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:] + 243\n\t5   CoreFoundation                      0x000000010b3cb258 +[NSDictionary dictionaryWithObjects:forKeys:count:] + 49\n\t6   QuickLook                           0x000000010ba9d5de __49+[QLItem(PreviewInfo) contentTypesToPreviewTypes]_block_invoke + 484\n\t7   libdispatch.dylib                   0x00000001155edb25 _dispatch_client_callout + 8\n\t8   libdispatch.dylib                   0x00000001155eecdd _dispatch_once_callout + 20\n\t9   QuickLook                           0x000000010ba9d3f8 +[QLItem(PreviewInfo) contentTypesToPreviewTypes] + 46\n\t10  QuickLook                           0x000000010ba9dd39 -[QLItem(PreviewInfo) _uncachedPreviewItemTypeForContentType:] + 117\n\t11  QuickLook                           0x000000010ba9e2a6 -[QLItem(PreviewInfo) _previewItemTypeForType:] + 150\n\t12  QuickLook                           0x000000010ba9e0ac -[QLItem(PreviewInfo) _getPreviewItemType] + 61\n\t13  QuickLook                           0x000000010bb254da -[QLItem previewItemType] + 59\n\t14  QuickLook                           0x000000010bad4d1d +[QLItemFetcherFactory fetcherForPreviewItem:] + 90\n\t15  QuickLook                           0x000000010bb24ba3 -[QLItem fetcher] + 44\n\t16  QuickLook                           0x000000010ba88828 -[QLPreviewController previewItemAtIndex:withCompletionHandler:] + 153\n\t17  QuickLook                           0x000000010babe7af __63-[QLPreviewItemStore previewItemAtIndex:withCompletionHandler:]_block_invoke + 262\n\t18  QuickLook                           0x000000010baf2629 QLRunInMainThread + 51\n\t19  QuickLook                           0x000000010babe67a -[QLPreviewItemStore previewItemAtIndex:withCompletionHandler:] + 181\n\t20  QuickLook                           0x000000010ba82847 -[QLPreviewController internalCurrentPreviewItem] + 222\n\t21  QuickLook                           0x000000010bb02148 -[QLPreviewController(Overlay) _actionButton] + 344\n\t22  QuickLook                           0x000000010bb02824 -[QLPreviewController(Overlay) _toolBarButtonsWithTraitCollection:] + 1147\n\t23  QuickLook                           0x000000010bb00307 -[QLPreviewController(Overlay) _updateOverlayButtonsIfNeededWithTraitCollection:animated:updatedToolbarButtons:] + 129\n\t24  QuickLook                           0x000000010baff9aa -[QLPreviewController(Overlay) updateOverlayAnimated:animatedButtons:forceRefresh:withTraitCollection:] + 152\n\t25  QuickLook                           0x000000015038f955 -[QLPreviewControllerAccessibility updateOverlayAnimated:animatedButtons:forceRefresh:withTraitCollection:] + 84\n\t26  QuickLook                           0x000000010ba826af -[QLPreviewController _setCurrentPreviewItemIndex:updatePreview:animated:] + 230\n\t27  QuickLook                           0x000000010ba883be -[QLPreviewController reloadData] + 418\n\t28  App.iOS                       0x000000010297ee8c xamarin_dyn_objc_msgSendSuper + 220\n\t29  ???                                 0x000000014e1ea6a2 0x0 + 5605598882\n\t30  ???                                 0x0000000148b73746 0x0 + 5514934086\n\t31  Mono                                0x000000010bd070b5 mono_jit_runtime_invoke + 1621\n\t32  Mono                                0x000000010befc1e8 mono_runtime_invoke_checked + 136\n\t33  Mono                                0x000000010beffb0e mono_runtime_invoke + 142\n\t34  App.iOS                       0x000000010297621b xamarin_invoke_trampoline + 6219\n\t35  App.iOS                       0x000000010297da09 xamarin_arch_trampoline + 105\n\t36  App.iOS                       0x000000010297ebee xamarin_x86_64_common_trampoline + 118\n\t37  QuickLook                           0x000000010ba7f823 -[QLPreviewController viewWillAppear:] + 398\n\t38  App.iOS                       0x000000010297ee8c xamarin_dyn_objc_msgSendSuper + 220\n\t39  ???                                 0x000000014e2389c4 0x0 + 5605919172\n

I am trying solve this now.

Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff

2023-01-06T03:07:14.053+00:00

When you run your code before on iOS 15.5 device, does it crash?

double systemVersion = Convert.ToDouble(UIDevice.CurrentDevice.SystemVersion); if (systemVersion>16.0) {// the code I provide }else { PdfPreviewController previewController = new PdfPreviewController(file, title); if (File.Exists(file)) { previewController.DataSource = new PDFPreviewControllerDataSource(NSUrl.FromFilename(file), title); UIApplication.SharedApplication.KeyWindow.RootViewController.PresentViewController(previewController, true, null); } }

I add a break point and it crashed at UIApplication.SharedApplication.KeyWindow.RootViewController.PresentViewController(previewController, true, null); . It looks like another issue.
In this thread, we are mainly discussing about hiding this title menu as indicated by the first post. And it is solved. Then please try to mark the answer which help you. It will encourage the person who help you. Then for your new question it would be best if you try to open up a new thread for it, and you could mention me to let me know the new thread link. We can work together to figure it out.
In this way, it will make answer searching in the forum easier and be beneficial to other community members as well.
Pelin Konaray 291 Reputation points

2023-01-06T06:09:14.83+00:00

Thank you very much for your helps @Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.)

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How to prevent to open title menu of QLPreviewController - Xamarin.Forms iOS?

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