How to hide UINavigationBar 1px bottom line

 

I have an app that sometimes needs its navigation bar to blend in with the content.

Does anyone know how to get rid of or to change color of this annoying little bar?

On the image below situation i have - i'm talking about this 1px height line below "Root View Controller"

在这里输入图像描述

To do this, you should set a custom shadow image. But for the shadow image to be shown you also need to set a custom background image, quote from Apple's documentation:

For a custom shadow image to be shown, a custom background image must also be set with the setBackgroundImage(_:for:) method. If the default background image is used, then the default shadow image will be used regardless of the value of this property.

So: 

let navigationBar = navigationController!.navigationBar
navigationBar.setBackgroundImage(#imageLiteral(resourceName: "BarBackground"),
                                                        for: .default)
navigationBar.shadowImage = UIImage()

Above is the only "official" way to hide it. Unfortunately, it removes bar's translucency.

I don't want background image, just color

You have those options:

  • Solid color, no translucency: 

    navigationBar.barTintColor = UIColor.redColor()
navigationBar.isTranslucent = false
navigationBar.setBackgroundImage(UIImage(), for: .default)
navigationBar.shadowImage = UIImage()

  • Create small background image filled with color and use it.

  • Use 'hacky' method described below. It will also keep bar translucent.

    • How to keep bar translucent?

    To keep translucency you need another approach, it looks like a hack but works well. The shadow we're trying to remove is a hairline UIImageView somewhere under UINavigationBar . We can find it and hide/show it when needed.

    Instructions below assume you need hairline hidden only in one controller of your UINavigationController hierarchy.

  • Declare instance variable: 

    private var shadowImageView: UIImageView?

  • Add method which finds this shadow (hairline) UIImageView: 

    private func findShadowImage(under view: UIView) -> UIImageView? {
    if view is UIImageView && view.bounds.size.height <= 1 {
        return (view as! UIImageView)
    }

    for subview in view.subviews {
        if let imageView = findShadowImage(under: subview) {
            return imageView
        }
    }
    return nil
}

  • Add/edit viewWillAppear/viewWillDisappear methods: 

    override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    if shadowImageView == nil {
        shadowImageView = findShadowImage(under: navigationController!.navigationBar)
    }
    shadowImageView?.isHidden = true
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)

    shadowImageView?.isHidden = false
}

    • The same method should also work for UISearchBar hairline, and (almost) anything else you need to hide :)

    Many thanks to @Leo Natan for the original idea!

    如果您只想使用实心导航栏颜色并在故事板中进行设置，请在您的AppDelegate类中使用此代码通过外观代理移除1像素边框： 

    [[UINavigationBar appearance] setBackgroundImage:[[UIImage alloc] init]
                                  forBarPosition:UIBarPositionAny
                                      barMetrics:UIBarMetricsDefault];

[[UINavigationBar appearance] setShadowImage:[[UIImage alloc] init]];

    After all the obstacle, I have found this solution to remove bottom border line for navigation bar.

    Swift: 

    self.navigationController?.navigationBar.setValue(true, forKey: "hidesShadow")

    Objective C: 

    [self.navigationController.navigationBar setValue:@(YES) forKeyPath:@"hidesShadow"];
    链接地址: http://www.djcxy.com/p/81922.html

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