Change navigation bar color in QLPreviewController

Question

I want to change navigation bar color of QLPreviewController in swift 3. I have used below code to change color but its not working

viewQLPreview = QLPreviewController()
viewQLPreview.dataSource = self
viewQLPreview.delegate = self
viewQLPreview.navigationController?.navigationBar.isTranslucent = false
viewQLPreview.navigationController?.navigationBar.tintColor = UIColor.red

Try this if works out for you:https://stackoverflow.com/questions/46239664/how-to-customize-the-color-of-the-navigation-bar-in-qlpreviewcontroller — tech_enthusiast, Feb 16 '18 at 07:27

Rushabh · Accepted Answer · 2019-12-23T12:08:50.793

6

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

edited Dec 23 '19 at 12:08

answered Feb 21 '18 at 10:13

Rushabh

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QLPreviewController is not found when I do this. UIKit is imported in the file. Any idea what to import in order to use QLPreviewController? – Kevin Nov 16 '21 at 09:11
QLPreviewController lives in QuickLook: `import QuickLook` – schmidiii Dec 22 '21 at 13:29

score 4 · Answer 2 · answered Feb 16 '18 at 09:06

Use below code before present QLPreviewController :

UINavigationBar.appearance().tintColor = UIColor.red
UINavigationBar.appearance().barTintColor = UIColor.blue
UINavigationBar.appearance().titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.red]
UINavigationBar.appearance().setBackgroundImage(fromColor(color: UIColor.blue), for: .default)
UINavigationBar.appearance().isTranslucent = false 

func fromColor (color: UIColor) -> UIImage{
        let rect = CGRect(x: 0, y: 0, width: 1, height: 1)
        UIGraphicsBeginImageContext(rect.size)
        let context: CGContext? = UIGraphicsGetCurrentContext()
        context?.setFillColor(color.cgColor)
        context?.fill(rect)
        let image: UIImage? = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image ?? UIImage()
    }

score -4 · Answer 3 · answered Feb 16 '18 at 07:54

-4

Put below code in viewDidLoad of QLPreviewController.

viewQLPreview.navigationController?.navigationBar.isTranslucent = false
viewQLPreview.navigationController?.navigationBar.tintColor = UIColor.red

Also make sure that viewQLPreview.navigationController != nil

If you are pushing QLPreviewController then this code will work....

If you are presenting QLPreviewController then you need to make sure that rootController should be navigation controller, in your case..

let viewQLPreview = QLPreviewController()
let nav = UINavigationController(rootViewController: viewQLPreview)
self.present(nav, animated: true, completion: nil)

answered Feb 16 '18 at 07:54

Mahendra

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thanks for your answer using your code i can able to change color but cancel button not appeat in navigation bar. – Rushabh Feb 16 '18 at 08:52
just set the tintColor and barTintColor of navigation bar.:) – Mahendra Feb 16 '18 at 09:26
This is perfect answer for me, thanks for explaining – Mehul Dec 22 '20 at 14:52

Change navigation bar color in QLPreviewController

3 Answers3