SwiftUI Remove NavigationBar Bottom Border

In the initializer of your View you can set the appearance of your navigation bar. There you have to set the .shadowColor property to .clear.

init() {
    let appearance = UINavigationBarAppearance()
    appearance.shadowColor = .clear
    UINavigationBar.appearance().standardAppearance = appearance
    UINavigationBar.appearance().scrollEdgeAppearance = appearance
}

I have also met this problem. Here is the almost similar post

But most of the answer had side effect. And for me, the best solution was this

UINavigationBar.appearance().barTintColor = .clear
UINavigationBar.appearance().backgroundColor = .clear 
UINavigationBar.appearance().setBackgroundImage(UIImage(), for: .default)
UINavigationBar.appearance().shadowImage = UIImage()

and also want its important to set UIImage() not 'nil' to shadowImage and bacgroundImage. And I made navigation displayMode inline

.navigationBarTitle(Text(""), displayMode: .inline)

This is what worked for me

UINavigationBar.appearance().shadowImage = UIImage()

SwiftUI, 1 line.

UINavigationBar.appearance().standardAppearance.shadowColor = .clear

I implemented that inside .onAppear {}

In Xcode 12.4, this is the combination that worked for me:

init() {
    UINavigationBar.appearance().shadowImage = UIImage()
    UINavigationBar.appearance().setBackgroundImage(UIImage(), for: .default)
    UINavigationBar.appearance().isTranslucent = false
    UINavigationBar.appearance().barTintColor = UIColor.red
}