CODEWITHSUNDEEP
iosswiftuinavigationbarios11
alexkaessner
alexkaessner

Reputation: 2908

custom background image with large titles NavigationBar in iOS 11

How do you set a custom background image for the large title NavigationBar in iOS 11? I'm using a custom subclass which I've assigned to the navigationControllers in the storyboard.

This is how I create my custom NavBar:

class CustomNavigationController: UINavigationController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        self.navigationBar.tintColor = UIColor(red:1, green:1, blue:1, alpha:0.6)
        self.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]
        if #available(iOS 11.0, *) {
            self.navigationBar.prefersLargeTitles = true
            self.navigationItem.largeTitleDisplayMode = .automatic
            self.navigationBar.largeTitleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]
            self.navigationBar.barTintColor = UIColor.green
        }
        self.navigationBar.isTranslucent = false
        self.navigationBar.setBackgroundImage(#imageLiteral(resourceName: "navigationBarBackground"), for: .default)
        self.navigationBar.shadowImage = #imageLiteral(resourceName: "navigationBarShadow")
    }
}

Strangely the setBackgroundImage(image, for: .default) doesn't work for the large titles. It worked before with iOS 10 and also if I rotate the iPhone (and activate the small NavBar) the background is back?

Edit: The backgroundImage is still rendered but somehow hidden. Only if you start scrolling and the "normal" Navigation Bar appears, the backgroundImage is visible. Also the barTintColor is completely ignored in this case. screenshot GIF

Upvotes: 26

Views: 13491

Answers (7)

UnuSynth
UnuSynth

Reputation: 108

Finally I found solution!

Edit: Works on iOS 13 and higher

You can use it before view appears, eg: in viewDidLoad() method:

    override func viewDidLoad()
    {
        super.viewDidLoad()

        let largeTitleAppearance = UINavigationBarAppearance() 

        largeTitleAppearance.configureWithOpaqueBackground()
        largeTitleAppearance.backgroundImage = UIImage(named: "BackgroundImage.png")

        self.navigationBar.standardAppearance = largeTitleAppearance
        self.navigationBar.scrollEdgeAppearance = largeTitleAppearance
    }

All that you need is:

  1. Create UINavigationBarAppearance instance:

    let largeTitleAppearance = UINavigationBarAppearance()

    Apple documentation:

    UINavigationBarAppearance - An object for customizing the appearance of a navigation bar.

  1. Configure it:

    largeTitleAppearance.configureWithOpaqueBackground()

    "Opaque" here because we want to set colorised image (but in practice it doesn't matter, what configure will you set)

  1. Set background image:

    largeTitleAppearance.backgroundImage = UIImage(named: "BackgroundImage.png") // Set here image that you need

  1. Assign our largeTitleAppearance object to both standardAppearance and scrollEdgeAppearance navigationBar's fields:

    self.navigationBar.standardAppearance = largeTitleAppearance // For large-navigationBar condition when it is collapsed
self.navigationBar.scrollEdgeAppearance = largeTitleAppearance // For large-navigationBar condition when it is expanded

    Apple documentation:

    .standardAppearance - The appearance settings for a standard-height navigation bar.

    .scrollEdgeAppearance - The appearance settings to use when the edge of any scrollable content reaches the matching edge of the navigation bar.

This helped to me: https://sarunw.com/posts/uinavigationbar-changes-in-ios13/#going-back-to-old-style

Upvotes: 8

blyscuit
blyscuit

Reputation: 684

Changing the barTint didn't work for me so I change the layer inside navigationBar

 navigationBar.layer.backgroundColor = UIColor(patternImage:
        UIImage(named: "BG-Roof1")!.resizableImage(withCapInsets:
            UIEdgeInsets(top: 0, left: 0, bottom: 10, right: 0), resizingMode: .stretch)).cgColor

Upvotes: 0

iOS_Mouse
iOS_Mouse

Reputation: 844

Piggybacking on oldrinmendez's answer - that solution works perfect for a horizontal gradient.

For a VERTICAL gradient, I was able to use the same function from oldrinmendez's answer by calling it again in scrollViewDidScroll. This continually adjusts the height of the gradient image as the user scrolls.

Start with the function from oldrinmendez :

func imageWithGradient(startColor:UIColor, endColor:UIColor, size:CGSize, horizontally:Bool) -> UIImage? {

        let gradientLayer = CAGradientLayer()
        gradientLayer.frame = CGRect(x: 0, y: 0, width: size.width, height: size.height)
        gradientLayer.colors = [startColor.cgColor, endColor.cgColor]
        if horizontally {
            gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.5)
            gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.5)
        } else {
            gradientLayer.startPoint = CGPoint(x: 0.5, y: 0)
            gradientLayer.endPoint = CGPoint(x: 0.5, y: 1)
        }

        UIGraphicsBeginImageContext(gradientLayer.bounds.size)
        gradientLayer.render(in: UIGraphicsGetCurrentContext()!)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }

Create an update function to call it with the options you want:

func updateImageWithGradient() {

        let navBarHeight  = self.navigationController?.navigationBar.frame.size.height
        let statusBarHeight = UIApplication.shared.statusBarFrame.height
        let heightAdjustment: CGFloat = 2

        let gradientHeight = navBarHeight! + statusBarHeight + heightAdjustment

        let bgimage = imageWithGradient(startColor: UIColor.red, endColor: UIColor.orange, size: CGSize(width: UIScreen.main.bounds.size.width, height: gradientHeight), horizontally: false)
        navigationController?.navigationBar.barTintColor = UIColor(patternImage: bgimage!)
    }

Finally add the update function to scrollViewDidScroll & ViewDidApper: Use ViewDidAppear so the correct navigation bar height is returned

override func viewDidAppear(_ animated: Bool) {
        updateImageWithGradient()
    }

override func scrollViewDidScroll(_ scrollView: UIScrollView) {
     DispatchQueue.main.async {
        updateImageWithGradient()
       }
    }

Upvotes: 1

TomikeKrasnay
TomikeKrasnay

Reputation: 51

Try this code (Swift 4.0):

in viewDidLoad()

self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.black]
if #available(iOS 11.0, *) {
    self.navigationController?.navigationBar.prefersLargeTitles = true
    self.navigationItem.largeTitleDisplayMode = .automatic
    self.navigationController?.navigationBar.largeTitleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.black]
} else {
    //iOS <11.0
}
self.title = "Title"
self.navigationController?.navigationBar.barTintColor = UIColor(patternImage: #imageLiteral(resourceName: "nav_bg"))
self.navigationController?.navigationBar.isTranslucent = false

Upvotes: 3

gorhal
gorhal

Reputation: 459

In Xamarin it would be like this:

this.NavigationBar.BackgroundColor = UIColor.Clear;

      var gradientLayer = new CAGradientLayer
      {
        Frame = new CGRect(0, 0, UIApplication.SharedApplication.StatusBarFrame.Width,
              UIApplication.SharedApplication.StatusBarFrame.Height + this.NavigationBar.Frame.Height),
        Colors = new CGColor[]
              {Constants.Defaults.Navigation.RealBlueColor.ToCGColor(), Constants.Defaults.Navigation.RealBlueColor.ToCGColor()}
      };

      UIGraphics.BeginImageContext(gradientLayer.Bounds.Size);
      gradientLayer.RenderInContext((UIGraphics.GetCurrentContext()));
      UIImage image = UIGraphics.GetImageFromCurrentImageContext();
      UIGraphics.EndImageContext();

      this.View.Layer.InsertSublayer(gradientLayer, 0);
      this.NavigationBar.BarTintColor = UIColor.FromPatternImage(image);

The this.View.Layer.Insert is optional. I need it when I'm "curling" up and down an image on the NavigationBar

Upvotes: 0

Pocheshire
Pocheshire

Reputation: 186

In iOS 11 you no more need set BackgroundImage(Remove its declaration) if you use large titles. Instead you need use BarTintColor.

class CustomNavigationController: UINavigationController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        self.navigationBar.tintColor = UIColor(red:1, green:1, blue:1, alpha:0.6)
        self.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]
        if #available(iOS 11.0, *) {
            self.navigationBar.prefersLargeTitles = true
            self.navigationItem.largeTitleDisplayMode = .automatic
            self.navigationBar.largeTitleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]
            self.navigationBar.barTintColor = UIColor(red:1, green:1, blue:1, alpha:1)
        }
        else {
            self.navigationBar.setBackgroundImage(#imageLiteral(resourceName: "navigationBarBackground"), for: .default)                
        }
        self.navigationBar.shadowImage = #imageLiteral(resourceName: "navigationBarShadow")
        self.navigationBar.isTranslucent = false
    }
}

Upvotes: 6

oldrinmendez
oldrinmendez

Reputation: 991

I had the same issue, fixed it by

Remove setBackgroundImage and use barTint color with pattern image

let bgimage = imageWithGradient(startColor: UIColor.red, endColor: UIColor.yellow, size: CGSize(width: UIScreen.main.bounds.size.width, height: 1))
self.navigationBar.barTintColor = UIColor(patternImage: bgimage!)

Get image with gradient colors

func imageWithGradient(startColor:UIColor, endColor:UIColor, size:CGSize, horizontally:Bool = true) -> UIImage? {

    let gradientLayer = CAGradientLayer()
    gradientLayer.frame = CGRect(x: 0, y: 0, width: size.width, height: size.height)
    gradientLayer.colors = [startColor.cgColor, endColor.cgColor]
    if horizontally {
        gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.5)
        gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.5)
    } else {
        gradientLayer.startPoint = CGPoint(x: 0.5, y: 0.0)
        gradientLayer.endPoint = CGPoint(x: 0.5, y: 1.0)
    }

    UIGraphicsBeginImageContext(gradientLayer.bounds.size)
    gradientLayer.render(in: UIGraphicsGetCurrentContext()!)
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return image
}

Upvotes: 20

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