在swift中删除navigationBar中的边框

Question

我一直试图删除navigationBars边框没有运气.我已经研究过,人们似乎告诉将shadowImage和BackgroundImage设置为nil,但这在我的情况下不起作用.

我的代码

    self.navigationController?.navigationBar.barTintColor = UIColor(rgba: "#4a5866")
    self.navigationController?.navigationBar.setBackgroundImage(UIImage(named: ""), forBarMetrics: UIBarMetrics.Default)
    self.navigationController?.navigationBar.shadowImage = UIImage(named: "")

插图:

Answer 1

麻烦在于这两行:

self.navigationController?.navigationBar.setBackgroundImage(UIImage(named: ""), forBarMetrics: UIBarMetrics.Default)
self.navigationController?.navigationBar.shadowImage = UIImage(named: "")

由于您没有没有名称的图像,因此UIImage(named: "")返回nil,这意味着默认行为将起作用:

当非零时,显示自定义阴影图像而不是默认阴影图像.要显示自定义阴影,还必须使用-setBackgroundImage设置自定义背景图像:forBarMetrics :(如果使用默认背景图像,将使用默认阴影图像).

你需要一个真正的空图像,所以只需初始化UIImage():

self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: UIBarMetrics.default)
self.navigationController?.navigationBar.shadowImage = UIImage()

Answer 2

这将完全删除阴影图像

for parent in self.navigationController!.navigationBar.subviews {
 for childView in parent.subviews {
     if(childView is UIImageView) {
         childView.removeFromSuperview()
     }
 }
}

Answer 3

斯威夫特4

删除边框:

self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for:.default)
self.navigationController?.navigationBar.shadowImage = UIImage()
self.navigationController?.navigationBar.layoutIfNeeded()

恢复边界:

self.navigationController?.navigationBar.setBackgroundImage(nil, for:.default)
self.navigationController?.navigationBar.shadowImage = nil
self.navigationController?.navigationBar.layoutIfNeeded()

Answer 4

使用Swift 2,你可以这样做:

AppDelegate文件

内部func应用程序(...,didFinishLaunchingWithOptions launchOptions:...)

UINavigationBar.appearance().shadowImage = UIImage()
UINavigationBar.appearance().setBackgroundImage(UIImage(), forBarMetrics: .Default)

对于Swift 3:

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

Answer 5

只需在UINavigationBar的扩展中写下这个

extension UINavigationBar {

    func shouldRemoveShadow(_ value: Bool) -> Void {
        if value {
            self.setValue(true, forKey: "hidesShadow")
        } else {
            self.setValue(false, forKey: "hidesShadow")
        }
    }
}

在你的viewController ..

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    self.navigationController?.navigationBar.shouldRemoveShadow(true)        
}

为了解决任何viewController的问题,只需传递'false'即可.

Answer 6

对于 iOS 13+：

let appearance = UINavigationBarAppearance()
appearance.shadowColor = .clear

将此外观分配给UINavigationBar：

navigationController?.navigationBar.standardAppearance = appearance
navigationController?.navigationBar.scrollEdgeAppearance = appearance
navigationController?.navigationBar.compactAppearance = appearance

设置shadowImage = UIImage()对我来说不起作用。

Answer 7

斯威夫特 5

使用 setBackgroundImage / shadowImage 隐藏发际线时，会有一点延迟。这种方法消除了延迟。感谢变色龙框架。这是他们使用的方法（在 ObjC 中）

extension UINavigationController {
    func hideHairline() {
        if let hairline = findHairlineImageViewUnder(navigationBar) {
            hairline.isHidden = true
        }
    }
    func restoreHairline() {
        if let hairline = findHairlineImageViewUnder(navigationBar) {
            hairline.isHidden = false
        }
    }
    func findHairlineImageViewUnder(_ view: UIView) -> UIImageView? {
        if view is UIImageView && view.bounds.size.height <= 1.0 {
            return view as? UIImageView
        }
        for subview in view.subviews {
            if let imageView = self.findHairlineImageViewUnder(subview) {
                return imageView
            }
        }
        return nil
    }
}

Answer 8

设置barStyle来.Black设置色调之前:

self.navigationController?.navigationBar.translucent = false
self.navigationController?.navigationBar.barStyle = .Black
self.navigationController?.navigationBar.barTintColor = UIColor.blueColor()

Answer 9

Luca Davanzo的答案很棒,但它在iOS 10中不起作用.我将其改为iOS 10及以下版本.

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
            }
        }
    }
}

您还可以扩展UINavigationController并将其调用.removeFromSuperview()在线上将不能在iOS 10上工作,所以我只是将alpha设置为0,所以这一个调用在任何地方都兼容.

Answer 10

let navBarAppearance = UINavigationBarAppearance()
navBarAppearance.configureWithTransparentBackground()

Answer 11

要从Swift 3+中删除UINavigationBar的边框,请使用:

UINavigationBar.appearance().shadowImage = UIImage()
UINavigationBar.appearance().setBackgroundImage(UIImage(), for: .default)
UINavigationBar.appearance().isTranslucent = false

Answer 12

Only this worked for me,

self.navigationController?.navigationBar.shadowImage = UIImage()

Ref

Answer 13

为 Swift 4 更新，以防有人想知道

navigationBar.shadowImage = UIImage()
navigationBar.backIndicatorImage = UIImage()

现在更不冗长了。

Answer 14

Jack Chen的Swiftier方法：

extension UINavigationController {

    var isHiddenHairline: Bool {
        get {
            guard let hairline = findHairlineImageViewUnder(navigationBar) else { return true }
            return hairline.isHidden
        }
        set {
            if let hairline = findHairlineImageViewUnder(navigationBar) {
                hairline.isHidden = newValue
            }
        }
    }

    private func findHairlineImageViewUnder(_ view: UIView) -> UIImageView? {
        if view is UIImageView && view.bounds.size.height <= 1.0 {
            return view as? UIImageView
        }

        for subview in view.subviews {
            if let imageView = self.findHairlineImageViewUnder(subview) {
                return imageView
            }
        }

        return nil
    }
}

使用：

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        navigationController?.isHiddenHairline = true
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        navigationController?.isHiddenHairline = false
    }

Answer 15

对于斯威夫特3

在viewDidLoad方法中

navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
navigationController?.navigationBar.shadowImage = UIImage()