How to Make The Navigation Bar Transparent

css to make bootstrap navbar transparent

I was able to make the navigation bar transparent by adding a new .transparent class to the .navbar and setting the CSS like this:

 .navbar.transparent.navbar-inverse .navbar-inner {
    border-width: 0px;
    -webkit-box-shadow: 0px 0px;
    box-shadow: 0px 0px;
    background-color: rgba(0,0,0,0.0);
    background-image: -webkit-gradient(linear, 50.00% 0.00%, 50.00% 100.00%, color-stop( 0% , rgba(0,0,0,0.00)),color-stop( 100% , rgba(0,0,0,0.00)));
    background-image: -webkit-linear-gradient(270deg,rgba(0,0,0,0.00) 0%,rgba(0,0,0,0.00) 100%);
    background-image: linear-gradient(180deg,rgba(0,0,0,0.00) 0%,rgba(0,0,0,0.00) 100%);
}

My markup is like this

<div class="navbar transparent navbar-inverse">
            <div class="navbar-inner">....

Transparent iOS navigation bar

You can apply Navigation Bar Image like below for Translucent.

Objective-C:

[self.navigationController.navigationBar setBackgroundImage:[UIImage new]
                     forBarMetrics:UIBarMetricsDefault]; //UIImageNamed:@"transparent.png"
self.navigationController.navigationBar.shadowImage = [UIImage new];////UIImageNamed:@"transparent.png"
self.navigationController.navigationBar.translucent = YES;
self.navigationController.view.backgroundColor = [UIColor clearColor];

Swift 3:

self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default) //UIImage.init(named: "transparent.png")
self.navigationController?.navigationBar.shadowImage = UIImage()
self.navigationController?.navigationBar.isTranslucent = true
self.navigationController?.view.backgroundColor = .clear
    

Make nav bar transparent when resting at the top of the page?

Here ya go. You need to detect when the user scrolls to update the header styles

// When the user scrolls the page, execute myFunction
window.onscroll = function() {myFunction()};

// Get the header
var header = document.getElementById("myHeader");

// Get the offset position of the navbar
var sticky = header.offsetTop;

// Add the solid class to the header when you reach its scroll position. Remove "solid" when you leave the scroll position
function myFunction() {
  if (window.pageYOffset > sticky) {
    header.classList.add("solid");
  } else {
    header.classList.remove("solid");
  }
}

body { background-color: gray; }

header {
height: 75px;
width: 100%;
position: sticky;
top: 20px;
transition: all 0.5s;
background-color: lightblue;
}

header.solid {
background-color: darkgray;
}

.tall {
width: 100%;
height: 1500px;
}

<header id="myHeader"><span>The Header</span></header>

<div class="tall">
<p>Tall DIV</p>
</div>

How can I make the Navigation Bar transparent?

Try this:

extension UIViewController {
    func blurNav(withAlpha alpha:CGFloat = 1.0 ) {
        let statusBarHeight = view.window?.windowScene?.statusBarManager?.statusBarFrame.height ?? 0
        let rect = navigationController?.navigationBar.bounds.insetBy(dx: 0, dy: -(statusBarHeight)).offsetBy(dx: 0, dy: -(statusBarHeight)) ?? .zero
        let blurView = UIVisualEffectView(effect: UIBlurEffect(style: .light))
        blurView.frame = rect
        blurView.isUserInteractionEnabled = false
        blurView.alpha = alpha
        blurView.layer.zPosition = -1
        blurView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
        navigationController?.navigationBar.addSubview(blurView)
        navigationController?.navigationBar.sendSubviewToBack(blurView)
    }
}

Usage:

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    blurNav(withAlpha: 0.8)
}

How to make bottom system navigation bar transparent in flutter?

Found the answer from this GitHub discussion.

In android/app/build.gradle

dependencies {
     implementation 'androidx.core:core-ktx:1.5.0-beta01'
 }

In android/app/src/main/kotlin/com/example/edge2edge/MainActivity.kt

package com.example.edge2edge

 import androidx.core.view.WindowCompat
 import io.flutter.embedding.android.FlutterActivity

 class MainActivity: FlutterActivity() {
     override fun onPostResume() {
       super.onPostResume() 
       WindowCompat.setDecorFitsSystemWindows(window, false). 
     }
 }

In main.dart

void main() {
  SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle(
    statusBarColor: Colors.transparent,
    statusBarIconBrightness: Brightness.dark,
    systemNavigationBarColor: Colors.transparent,
  ));
  runApp(MyApp());
}

How to make a transparent bottom navigation bar in flutter

try this:

Scaffold(
  extendBody: true,

Transparent bottom navigation bar in flutter

My attempt using the Stack method discussed in the comments:

  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Stack(
          children: <Widget>[
            Container(
              decoration: BoxDecoration(
                image: DecorationImage(
                    image: AssetImage('assets/background.jpg'),
                    fit: BoxFit.cover),
              ),
            ),
            Align(
                alignment: Alignment.bottomCenter,
                child: Theme(
                    data: Theme.of(context)
                        .copyWith(canvasColor: Colors.transparent),
                    child: BottomNavigationBar(
                      currentIndex: 0,
                      items: [
                        BottomNavigationBarItem(
                            icon: Icon(Icons.home), title: Text('Home')),
                        BottomNavigationBarItem(
                            icon: Icon(Icons.home), title: Text('Home')),
                        BottomNavigationBarItem(
                            icon: Icon(Icons.home), title: Text('Home'))
                      ],
                    ))),
          ],
        ),
      ),
    );
  }

Edit: The BottomNavigationBar has an inbuilt elevation of 8.0 which you can't change and is causing that weird shadow effect. If you want to remove it, you could just implement your own kind of bottom bar like so:

Align(
                alignment: Alignment.bottomCenter,
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                  children: <Widget>[
                  IconButton(icon: Icon(Icons.home, color: Theme.of(context).accentColor,), onPressed: () {},),
                  IconButton(icon: Icon(Icons.home, color: Theme.of(context).accentColor,), onPressed: () {},),
                  IconButton(icon: Icon(Icons.home, color: Theme.of(context).accentColor,), onPressed: () {},),
                ],)),

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