iOS 15 Navigation Bar Transparent

To use your own colour scheme, use the following:

Swift

// White non-transucent navigatio bar, supports dark appearance
if #available(iOS 15, *) {
    let appearance = UINavigationBarAppearance()
    appearance.configureWithOpaqueBackground()
    UINavigationBar.appearance().standardAppearance = appearance
    UINavigationBar.appearance().scrollEdgeAppearance = appearance
}

Objective-c

if (@available(iOS 15.0, *)) {
    UINavigationBarAppearance *navBarAppearance = [[UINavigationBarAppearance alloc] init];
  navBarAppearance.backgroundColor = [UIColor redColor];
    [navBarAppearance configureWithOpaqueBackground];
    [UINavigationBar appearance].standardAppearance = navBarAppearance;
    [UINavigationBar appearance].scrollEdgeAppearance = navBarAppearance;
}

To get the default translucent behaviour, the way the default was before iOS 15, just set the scrollEdgeAppearance:

Swift

if #available(iOS 15, *) {
    UINavigationBar.appearance().scrollEdgeAppearance = UINavigationBarAppearance()
}

Objective-C

if (@available(iOS 15.0, *)) {
    [UINavigationBar appearance].scrollEdgeAppearance = [[UINavigationBarAppearance alloc] init]; 
}

There is no need to change anything in the storyboard. Here is the solution that finally worked when added to the App Delegate application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions:

//Fix Nav Bar tint issue in iOS 15.0 or later - is transparent w/o code below
if #available(iOS 15, *) {
    let appearance = UINavigationBarAppearance()
    appearance.configureWithOpaqueBackground()
    appearance.titleTextAttributes = [.foregroundColor: UIColor.white]
    appearance.backgroundColor = UIColor(red: 0.0/255.0, green: 125/255.0, blue: 0.0/255.0, alpha: 1.0)
    UINavigationBar.appearance().standardAppearance = appearance
    UINavigationBar.appearance().scrollEdgeAppearance = appearance
}

Note that it was necessary to set the title text attribute to "white" as the title text defaulted to black if this attribute was not specified.

Also note that this should only apply to iOS version 15.0 or later. It does not work for earlier versions as the storyboard navigation bar custom tint is the default behavior.

If anyone needs the Objective C version of G. Steve's answer

if (@available(iOS 15, *)){
        UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
        [appearance configureWithOpaqueBackground];
        appearance.titleTextAttributes = @{NSForegroundColorAttributeName : UIColor.whiteColor};
        appearance.backgroundColor = [UIColor colorWithRed:0.0/255.0 green:125/255.0 blue:0.0/255.0 alpha:1.0];
        [UINavigationBar appearance].standardAppearance = appearance;
        [UINavigationBar appearance].scrollEdgeAppearance = appearance;
    }

It get sorted for me in interface builder (xcode 13 - tested for iOS 13 and above) and did not need to check for iOS 15 availability (i.e. @available)

1. Choose standard and scroll edge appearances for the navigation bar.

2. Choose similar settings for both appearances

Good luck