i've been trying to remove the navigationBars border without luck. I've researched and people seem to tell to set shadowImage and BackgroundImage to nil, but this does not work in my case.
My code
self.navigationController?.navigationBar.barTintColor = UIColor(rgba: "#4a5866")
self.navigationController?.navigationBar.setBackgroundImage(UIImage(named: ""), forBarMetrics: UIBarMetrics.Default)
self.navigationController?.navigationBar.shadowImage = UIImage(named: "")
illustration:
The trouble is with these two lines:
self.navigationController?.navigationBar.setBackgroundImage(UIImage(named: ""), forBarMetrics: UIBarMetrics.Default)
self.navigationController?.navigationBar.shadowImage = UIImage(named: "")
Since you don't have an image with no name, UIImage(named: "") returns nil, which means the default behavior kicks in:
When non-nil, a custom shadow image to show instead of the default shadow image. For a custom shadow to be shown, a custom background image must also be set with -setBackgroundImage:forBarMetrics: (if the default background image is used, the default shadow image will be used).
You need a truly empty image, so just initialize with UIImage():
self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: UIBarMetrics.default)
self.navigationController?.navigationBar.shadowImage = UIImage()
this will remove the shadow image altogether
for parent in self.navigationController!.navigationBar.subviews {
for childView in parent.subviews {
if(childView is UIImageView) {
childView.removeFromSuperview()
}
}
}
With Swift 2 you can do it this way:
AppDelegate file
Inside func application(..., didFinishLaunchingWithOptions launchOptions:...)
UINavigationBar.appearance().shadowImage = UIImage()
UINavigationBar.appearance().setBackgroundImage(UIImage(), forBarMetrics: .Default)
for Swift 3:
UINavigationBar.appearance().shadowImage = UIImage()
UINavigationBar.appearance().setBackgroundImage(UIImage(), for: .default)
Just write this in the extension of UINavigationBar
extension UINavigationBar {
func shouldRemoveShadow(_ value: Bool) -> Void {
if value {
self.setValue(true, forKey: "hidesShadow")
} else {
self.setValue(false, forKey: "hidesShadow")
}
}
}
And in your viewController...
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.navigationBar.shouldRemoveShadow(true)
}
And to get this undone for any viewController, just pass false.
Swift 4 & Swift 5
Removing border:
self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for:.default)
self.navigationController?.navigationBar.shadowImage = UIImage()
self.navigationController?.navigationBar.layoutIfNeeded()
Restoring border:
self.navigationController?.navigationBar.setBackgroundImage(nil, for:.default)
self.navigationController?.navigationBar.shadowImage = nil
self.navigationController?.navigationBar.layoutIfNeeded()
Set barStyle to .Black before setting the tint:
self.navigationController?.navigationBar.translucent = false
self.navigationController?.navigationBar.barStyle = .Black
self.navigationController?.navigationBar.barTintColor = UIColor.blueColor()
Luca Davanzo's answer is great, but it does not work in iOS 10. I altered it to work in iOS 10 and below.
for parent in navigationController!.view.subviews {
for child in parent.subviews {
for view in child.subviews {
if view is UIImageView && view.frame.height == 0.5 {
view.alpha = 0
}
}
}
}
You can also extend UINavigationController and call this off of that. removeFromSuperview() on the line will not work on iOS 10, so I just set the alpha to 0 so this one call is compatible everywhere.
To remove border from UINavigationBar in Swift 3+, use:
UINavigationBar.appearance().shadowImage = UIImage()
UINavigationBar.appearance().setBackgroundImage(UIImage(), for: .default)
UINavigationBar.appearance().isTranslucent = false
for swift 3
in viewDidLoad method
navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
navigationController?.navigationBar.shadowImage = UIImage()
Updated for Swift 4 in case someone is wondering
navigationBar.shadowImage = UIImage()
navigationBar.backIndicatorImage = UIImage()
It's even less verbose now.
This is the way if you want to do it without changing the background color:
// Remove the border ImageView from the NavigationBar background
func hideBottomBorder() {
for view in navigationBar.subviews.filter({ NSStringFromClass($0.dynamicType) == "_UINavigationBarBackground" }) as [UIView] {
if let imageView = view.subviews.filter({ $0 is UIImageView }).first as? UIImageView {
imageView.removeFromSuperview()
}
}
}
NOTE: This might crash on a production app. Apparently the NavigationBar doesn't like its view disappearing
for the swift3 you should write slightly different way:
self.navigationController?.navigationBar.setBackgroundImage(UIImage(),
for: UIBarMetrics.default)
self.navigationController?.navigationBar.shadowImage = UIImage()
This is a streamlined version of Gaurav Chandarana's answer.
extension UINavigationBar {
func hideShadow(_ value: Bool = true) {
setValue(value, forKey: "hidesShadow")
}
}
The accepted answer worked for me but I noticed when I wanted the shadow image to reappear when popping back or pushing forward to another vc there was a noticeable blink in the navigation bar.
Using this method navigationController?.navigationBar.setValue(true, forKey: "hidesShadow")
in viewWillAppear the shadow bar is hidden in the current visible view controller.
Using these 2 methods
navigationController?.navigationBar.setBackgroundImage(nil, for: .default)
navigationController?.navigationBar.setValue(false, forKey: "hidesShadow")
in viewWillDisappear the blink still happens but only when the shadow image reappears and not the navigation bar itself.
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// 1. hide the shadow image in the current view controller you want it hidden in
navigationController?.navigationBar.setValue(true, forKey: "hidesShadow")
navigationController?.navigationBar.layoutIfNeeded()
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(true)
// 2. show the shadow image when pushing or popping in the next view controller. Only the shadow image will blink
navigationController?.navigationBar.setBackgroundImage(nil, for: .default)
navigationController?.navigationBar.setValue(false, forKey: "hidesShadow")
navigationController?.navigationBar.layoutIfNeeded()
}
The border line is an UIImageView and removing a subview which is an imageView will remove barButtonItems with UIImageView. Below code will help you remove it. Hope this helps someone who faced an issue like me.
for parent in self.navigationController!.navigationBar.subviews {
for childView in parent.subviews {
if childView.frame.height == 0.5 {
childView.removeFromSuperview()
}
}
}
The border UIImageView is only 0.5 in height so this code removes only that.
Within AppDelegate, this has globally changed the format of the NavBar and removes the bottom line/border:
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
UINavigationBar.appearance().setBackgroundImage(UIImage(), forBarPosition: UIBarPosition.Any, barMetrics: UIBarMetrics.Default)
UINavigationBar.appearance().shadowImage = UIImage()
UINavigationBar.appearance().tintColor = UIColor.whiteColor()
UINavigationBar.appearance().barTintColor = UIColor.redColor()
UINavigationBar.appearance().translucent = false
UINavigationBar.appearance().clipsToBounds = false
//UINavigationBar.appearance().backgroundColor = UIColor.redColor()
UINavigationBar.appearance().titleTextAttributes = [NSFontAttributeName : (UIFont(name: "FONT NAME", size: 18))!, NSForegroundColorAttributeName: UIColor.whiteColor()] }
Haven't managed to implement anything different on a specific VC, but this will help 90% of people
this is the answer in swift 3 base of Nate Cook answer
self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: UIBarMetrics.default)
self.navigationController?.navigationBar.shadowImage = UIImage()
iOS 11 and Swift 4 You should try following if you want to remove the border but don't to make the navigitonbar translucent
self.navigationBar.shadowImage = UIImage()
App delegate
UINavigationBar.appearance().setBackgroundImage(UIImage(), for: UIBarMetrics.default)
UINavigationBar.appearance().shadowImage = UIImage()
If you want to remove only the bottom line and keep the solid color of navigationBar, add these lines of code in viewDidLoad: Swift 3, 4:
navigationController?.navigationBar.shadowImage = UIImage()
navigationController?.navigationBar.isTranslucent = false
Peace!
来源：https://stackoverflow.com/questions/26390072/remove-border-in-navigationbar-in-swift