我有一个应用程序,有时需要它的导航栏融入内容。
有人知道怎么去掉或者改变这个烦人的小条的颜色吗?
在下图中,我说的是根视图控制器下面1px的高度线
我有一个应用程序,有时需要它的导航栏融入内容。
有人知道怎么去掉或者改变这个烦人的小条的颜色吗?
在下图中,我说的是根视图控制器下面1px的高度线
当前回答
我使用UINavigationBar扩展,使我能够隐藏/显示使用UIAppearance API的阴影或选择哪个导航栏必须隐藏/显示使用故事板(或源代码)的阴影。这是扩展:
import UIKit
private var flatAssociatedObjectKey: UInt8 = 0
/*
An extension that adds a "flat" field to UINavigationBar. This flag, when
enabled, removes the shadow under the navigation bar.
*/
@IBDesignable extension UINavigationBar {
@IBInspectable var flat: Bool {
get {
guard let obj = objc_getAssociatedObject(self, &flatAssociatedObjectKey) as? NSNumber else {
return false
}
return obj.boolValue;
}
set {
if (newValue) {
let void = UIImage()
setBackgroundImage(void, forBarPosition: .Any, barMetrics: .Default)
shadowImage = void
} else {
setBackgroundImage(nil, forBarPosition: .Any, barMetrics: .Default)
shadowImage = nil
}
objc_setAssociatedObject(self, &flatAssociatedObjectKey, NSNumber(bool: newValue),
objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
}
现在,要禁用所有导航条上的阴影,你必须使用:
UINavigationBar.appearance().flat = true
或者你可以使用故事板启用/禁用此行为:
其他回答
这里有另一个选择-我认为这只适用于你不需要半透明的导航栏(我没有)。我只是在导航栏的底部添加了一个1像素高的UIView(在导航栏下面1像素),颜色与我的导航栏相同:
UIView *view = [[UIView alloc] init];
[view setBackgroundColor:self.navigationController.navigationBar.barTintColor];
[self.navigationController.navigationBar addSubview:view];
[view mas_makeConstraints:^(MASConstraintMaker *make) {
make.height.equalTo(@(1.0f));
make.leading.trailing.equalTo(self.navigationController.navigationBar);
make.bottom.equalTo(self.navigationController.navigationBar).offset(1.0f);
}];
我正在使用砌体添加约束。
斯威夫特说
UINavigationBar.appearance().setBackgroundImage(UIImage(), forBarPosition: .Any, barMetrics: .Default)
UINavigationBar.appearance().shadowImage = UIImage()
in
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool
设置背景图像的问题是它消除了模糊。您可以在不设置背景图像的情况下删除它。在这里看到我的答案。
pxpgraphics对Swift 3.0的回答。
import Foundation
import UIKit
extension UINavigationBar {
func hideBottomHairline() {
let navigationBarImageView = hairlineImageViewInNavigationBar(view: self)
navigationBarImageView!.isHidden = true
}
func showBottomHairline() {
let navigationBarImageView = hairlineImageViewInNavigationBar(view: self)
navigationBarImageView!.isHidden = false
}
private func hairlineImageViewInNavigationBar(view: UIView) -> UIImageView? {
if view is UIImageView && view.bounds.height <= 1.0 {
return (view as! UIImageView)
}
let subviews = (view.subviews as [UIView])
for subview: UIView in subviews {
if let imageView: UIImageView = hairlineImageViewInNavigationBar(view: subview) {
return imageView
}
}
return nil
}
}
extension UIToolbar {
func hideHairline() {
let navigationBarImageView = hairlineImageViewInToolbar(view: self)
navigationBarImageView!.isHidden = true
}
func showHairline() {
let navigationBarImageView = hairlineImageViewInToolbar(view: self)
navigationBarImageView!.isHidden = false
}
private func hairlineImageViewInToolbar(view: UIView) -> UIImageView? {
if view is UIImageView && view.bounds.height <= 1.0 {
return (view as! UIImageView)
}
let subviews = (view.subviews as [UIView])
for subview: UIView in subviews {
if let imageView: UIImageView = hairlineImageViewInToolbar(view: subview) {
return imageView
}
}
return nil
}
}
适用于iOS 13+
窍门是用透明背景初始化'UINavigationBarAppearance'。然后,您可以轻松地删除导航栏的水平线。
let appearance = UINavigationBarAppearance()
appearance.configureWithTransparentBackground()
appearance.backgroundColor = .green // Required background color
最后,按照apple的建议将外观更改添加到导航项中。
self.navigationItem.standardAppearance = appearance
self.navigationItem.scrollEdgeAppearance = appearance
self.navigationItem.compactAppearance = appearance