Qlpreviewcontroller Change Title

QLPreviewController change title?

If you need to display a different title other than the lastPathComponent from your url, you can subclass QLPreviewItem and provide your own title implementing the optional property:

Instance Property Declaration:

var previewItemTitle: String? { get }

The title to display for the preview item.

If you do not implement a getter method for this property, or if your
method returns nil, QuickLook examines the URL or content of the item
being previewed to determine an appropriate title for display to the
user. Return a non-nil value for this property to provide a custom
title.

---

 protocol QLPreviewItem : NSObjectProtocol

Description

The QLPreviewItem protocol defines properties you implement to make your
application’s content visible in a QuickLook preview
(QLPreviewController in iOS or QLPreviewPanel in macOS). The methods
in this protocol are also declared as a category on the NSURL class.
As a result, you can use NSURL objects directly as preview
items—provided that you want to use the default titles of those items.
A default title is the last path component of an item’s URL. If you
want to supply your own preview item titles, create your own preview
item objects that adopt this protocol.

First Subclass QLPreviewItem:

import UIKit
import QuickLook
class PreviewItem: NSObject, QLPreviewItem {
    var previewItemURL: URL?
    var previewItemTitle: String?
    init(url: URL? = nil, title: String? = nil) {
        previewItemURL = url
        previewItemTitle = title
    }
}

Then in your controller you return the QLPreviewItem instead of the URL:

Xcode 11 • Swift 5.1

import UIKit
import QuickLook

class ViewController: UIViewController, QLPreviewControllerDelegate, QLPreviewControllerDataSource {

    var previewItems: [PreviewItem] = []

    override func viewDidLoad() {
        super.viewDidLoad()

        previewItems = [
            .init(url: Bundle.main.url(forResource: "your file 1", withExtension: "ext"),
                  title: "Custom Title 1"),
            .init(url: Bundle.main.url(forResource: "your file 2", withExtension: "ext"),
                  title: "Custom Title 2"),
        ]
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        quickLook()
    }

    func numberOfPreviewItems(in controller: QLPreviewController) -> Int { previewItems.count }

    func quickLook(at index: Int = 0) {
        let controller = QLPreviewController()
        controller.delegate = self
        controller.dataSource = self
        controller.currentPreviewItemIndex = index
        present(controller, animated: true)
    }

    func previewController(_ controller: QLPreviewController, previewItemAt index: Int) -> QLPreviewItem { previewItems[index] }
}

qlpreviewcontroller navigation bar - How to Change pageCount to String

Try this

        let lblNavTitle = UILabel(frame: CGRect(x: 60, y: 10, width: view.frame.size.width-110, height: 20))
        lblNavTitle?.textAlignment = .center
        lblNavTitle?.lineBreakMode = .byTruncatingMiddle
        lblNavTitle?.text = "File Name"
        navigationItem.titleView = lblNavTitle

OR

Simply set title property like

self.title = "File Name"

May be it will work for you

Change navigation bar color in QLPreviewController

I have used below code to Change navigation bar color of QLPreviewController in swift 3.0

UINavigationBar.appearance().barTintColor = UIColor.red

UINavigationBar.appearance(whenContainedInInstancesOf: [QLPreviewController.self]).backgroundColor = UIColor.red

QLPreviewController customise the title color of the navigation bar?

You can do it with appearance

Like this :

[[UINavigationBar appearance] setTitleTextAttributes:
 @{NSForegroundColorAttributeName: [UIColor whiteColor]}];

Quicklook/QLPreviewController shows a blank page instead of pdf on ios 8 but works fine on iOS7

This is actually a known issue in iOS 8 Beta 5.

See the URL under QuickLook
https://developer.apple.com/library/prerelease/ios/releasenotes/General/RN-iOSSDK-8.0/

---

Related Topics