更改导航栏底部边框颜色 Swift
Change navigation bar bottom border color Swift
适用于
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.navigationController?.navigationBar.setBackgroundImage(UIImage(), forBarMetrics: .Default)
self.navigationController?.navigationBar.shadowImage = UIColor.redColor().as1ptImage()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
extension UIColor {
func as1ptImage() -> UIImage {
UIGraphicsBeginImageContext(CGSizeMake(1, 1))
let ctx = UIGraphicsGetCurrentContext()
self.setFill()
CGContextFillRect(ctx, CGRect(x: 0, y: 0, width: 1, height: 1))
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
}
但是，当我添加一个 UITableView 时，它并没有出现在上面，而当我添加一个 UISearchView 时，它出现了，但删除了导航栏。
有人知道怎么解决吗？
导航栏的shadowImage属性需要调整
试试这个。我在 UIColor 上创建了一个类别作为助手，但你可以按照你喜欢的方式重构。
extension UIColor {
func as1ptImage() -> UIImage {
UIGraphicsBeginImageContext(CGSizeMake(1, 1))
let ctx = UIGraphicsGetCurrentContext()
self.setFill()
CGContextFillRect(ctx, CGRect(x: 0, y: 0, width: 1, height: 1))
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
}
选项 1：在单个导航栏上
然后在您的视图控制器中（将 UIColor 更改为您喜欢的颜色）：
// We can use a 1px image with the color we want for the shadow image
self.navigationController?.navigationBar.shadowImage = UIColor.redColor().as1ptImage()
// We need to replace the navigation bar's background image as well
// in order to make the shadowImage appear. We use the same 1px color tecnique
self.navigationController?.navigationBar.setBackgroundImage(UIColor.yellowColor().as1ptImage(), forBarMetrics: .Default)
选项 2：在所有导航栏上使用外观代理
无需在每个导航栏上设置背景图像和阴影图像，可以依赖 UIAppearance 代理。您可以尝试将这些行添加到您的 AppDelegate，而不是在 viewDidLoad 中添加之前的行。
// We can use a 1px image with the color we want for the shadow image
UINavigationBar.appearance().shadowImage = UIColor.redColor().as1ptImage()
// We need to replace the navigation bar's background image as well
// in order to make the shadowImage appear. We use the same 1px color technique
UINavigationBar.appearance().setBackgroundImage(UIColor.yellowColor().as1ptImage(), forBarMetrics: .Default)
对于 Swift 3.0 只需更改此行：
CGContextFillRect(ctx, CGRect(x: 0, y: 0, width: 1, height: 1))
对此：
ctx?.fill(CGRect(x: 0, y: 0, width: 1, height: 1))
来自@TheoF、@Alessandro 和@Pavel 的精彩贡献。
这是我所做的...
Swift 4
extension UIColor {
/// Converts this `UIColor` instance to a 1x1 `UIImage` instance and returns it.
///
/// - Returns: `self` as a 1x1 `UIImage`.
func as1ptImage() -> UIImage {
UIGraphicsBeginImageContext(CGSize(width: 1, height: 1))
setFill()
UIGraphicsGetCurrentContext()?.fill(CGRect(x: 0, y: 0, width: 1, height: 1))
let image = UIGraphicsGetImageFromCurrentImageContext() ?? UIImage()
UIGraphicsEndImageContext()
return image
}
}
在viewDidLoad()中使用：
/* In this example, I have a ViewController embedded in a NavigationController in IB. */
// Remove the background color.
navigationController?.navigationBar.setBackgroundImage(UIColor.clear.as1ptImage(), for: .default)
// Set the shadow color.
navigationController?.navigationBar.shadowImage = UIColor.gray.as1ptImage()
将@alessandro-orru 的回答放在一个扩展中
extension UINavigationController {
func setNavigationBarBorderColor(_ color:UIColor) {
self.navigationBar.shadowImage = color.as1ptImage()
}
}
extension UIColor {
/// Converts this `UIColor` instance to a 1x1 `UIImage` instance and returns it.
///
/// - Returns: `self` as a 1x1 `UIImage`.
func as1ptImage() -> UIImage {
UIGraphicsBeginImageContext(CGSize(width: 1, height: 1))
setFill()
UIGraphicsGetCurrentContext()?.fill(CGRect(x: 0, y: 0, width: 1, height: 1))
let image = UIGraphicsGetImageFromCurrentImageContext() ?? UIImage()
UIGraphicsEndImageContext()
return image
}
}
然后在您的视图控制器中添加：
self.navigationController?.setNavigationBarBorderColor(UIColor.red)
从 iOS 13 开始，您可以使用 UINavigationBarAppearance() class 和 shadowColor 属性:
if #available(iOS 13.0, *) {
let style = UINavigationBarAppearance()
style.shadowColor = UIColor.clear // Effectively removes the border
navigationController?.navigationBar.standardAppearance = style
// Optional info for follow-ups:
// The above will override other navigation bar properties so you may have to assign them here, for example:
//style.buttonAppearance.normal.titleTextAttributes = [.font: UIFont(name: "YourFontName", size: 17)!]
//style.backgroundColor = UIColor.orange
//style.titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.white,
NSAttributedString.Key.font: UIFont(name: "AnotherFontName", size: 20.0)!]
} else {
// Fallback on earlier versions
}
Swift 4.0 - 5.2
的解决方案
这是用于更改底部导航栏行的高度和颜色的小扩展
extension UINavigationController
{
func addCustomBottomLine(color:UIColor,height:Double)
{
//Hiding Default Line and Shadow
navigationBar.setValue(true, forKey: "hidesShadow")
//Creating New line
let lineView = UIView(frame: CGRect(x: 0, y: 0, width:0, height: height))
lineView.backgroundColor = color
navigationBar.addSubview(lineView)
lineView.translatesAutoresizingMaskIntoConstraints = false
lineView.widthAnchor.constraint(equalTo: navigationBar.widthAnchor).isActive = true
lineView.heightAnchor.constraint(equalToConstant: CGFloat(height)).isActive = true
lineView.centerXAnchor.constraint(equalTo: navigationBar.centerXAnchor).isActive = true
lineView.topAnchor.constraint(equalTo: navigationBar.bottomAnchor).isActive = true
}
}
添加此扩展后，您可以在任何 UINavigationController 上调用此方法（例如来自 ViewController viewDidLoad()）
self.navigationController?.addCustomBottomLine(color: UIColor.black, height: 20)
现在有更好的选择：
UINavigationBar.appearance().shadowImage = UIImage()
对于 iOS 13 岁及以后
guard let navigationBar = navigationController?.navigationBar else { return }
navigationBar.isTranslucent = true
if #available(iOS 13.0, *) {
let appearance = UINavigationBarAppearance()
appearance.configureWithTransparentBackground()
appearance.backgroundImage = UIImage()
appearance.backgroundColor = .clear
navigationBar.standardAppearance = appearance
} else {
navigationBar.setBackgroundImage(UIImage(), for: .default)
navigationBar.shadowImage = UIImage()
}
适用于
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.navigationController?.navigationBar.setBackgroundImage(UIImage(), forBarMetrics: .Default)
self.navigationController?.navigationBar.shadowImage = UIColor.redColor().as1ptImage()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
extension UIColor {
func as1ptImage() -> UIImage {
UIGraphicsBeginImageContext(CGSizeMake(1, 1))
let ctx = UIGraphicsGetCurrentContext()
self.setFill()
CGContextFillRect(ctx, CGRect(x: 0, y: 0, width: 1, height: 1))
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
}
但是，当我添加一个 UITableView 时，它并没有出现在上面，而当我添加一个 UISearchView 时，它出现了，但删除了导航栏。
有人知道怎么解决吗？
导航栏的shadowImage属性需要调整
试试这个。我在 UIColor 上创建了一个类别作为助手，但你可以按照你喜欢的方式重构。
extension UIColor {
func as1ptImage() -> UIImage {
UIGraphicsBeginImageContext(CGSizeMake(1, 1))
let ctx = UIGraphicsGetCurrentContext()
self.setFill()
CGContextFillRect(ctx, CGRect(x: 0, y: 0, width: 1, height: 1))
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
}
选项 1：在单个导航栏上
然后在您的视图控制器中（将 UIColor 更改为您喜欢的颜色）：
// We can use a 1px image with the color we want for the shadow image
self.navigationController?.navigationBar.shadowImage = UIColor.redColor().as1ptImage()
// We need to replace the navigation bar's background image as well
// in order to make the shadowImage appear. We use the same 1px color tecnique
self.navigationController?.navigationBar.setBackgroundImage(UIColor.yellowColor().as1ptImage(), forBarMetrics: .Default)
选项 2：在所有导航栏上使用外观代理
无需在每个导航栏上设置背景图像和阴影图像，可以依赖 UIAppearance 代理。您可以尝试将这些行添加到您的 AppDelegate，而不是在 viewDidLoad 中添加之前的行。
// We can use a 1px image with the color we want for the shadow image
UINavigationBar.appearance().shadowImage = UIColor.redColor().as1ptImage()
// We need to replace the navigation bar's background image as well
// in order to make the shadowImage appear. We use the same 1px color technique
UINavigationBar.appearance().setBackgroundImage(UIColor.yellowColor().as1ptImage(), forBarMetrics: .Default)
对于 Swift 3.0 只需更改此行：
CGContextFillRect(ctx, CGRect(x: 0, y: 0, width: 1, height: 1))
对此：
ctx?.fill(CGRect(x: 0, y: 0, width: 1, height: 1))
来自@TheoF、@Alessandro 和@Pavel 的精彩贡献。
这是我所做的...
Swift 4
extension UIColor {
/// Converts this `UIColor` instance to a 1x1 `UIImage` instance and returns it.
///
/// - Returns: `self` as a 1x1 `UIImage`.
func as1ptImage() -> UIImage {
UIGraphicsBeginImageContext(CGSize(width: 1, height: 1))
setFill()
UIGraphicsGetCurrentContext()?.fill(CGRect(x: 0, y: 0, width: 1, height: 1))
let image = UIGraphicsGetImageFromCurrentImageContext() ?? UIImage()
UIGraphicsEndImageContext()
return image
}
}
在viewDidLoad()中使用：
/* In this example, I have a ViewController embedded in a NavigationController in IB. */
// Remove the background color.
navigationController?.navigationBar.setBackgroundImage(UIColor.clear.as1ptImage(), for: .default)
// Set the shadow color.
navigationController?.navigationBar.shadowImage = UIColor.gray.as1ptImage()
将@alessandro-orru 的回答放在一个扩展中
extension UINavigationController {
func setNavigationBarBorderColor(_ color:UIColor) {
self.navigationBar.shadowImage = color.as1ptImage()
}
}
extension UIColor {
/// Converts this `UIColor` instance to a 1x1 `UIImage` instance and returns it.
///
/// - Returns: `self` as a 1x1 `UIImage`.
func as1ptImage() -> UIImage {
UIGraphicsBeginImageContext(CGSize(width: 1, height: 1))
setFill()
UIGraphicsGetCurrentContext()?.fill(CGRect(x: 0, y: 0, width: 1, height: 1))
let image = UIGraphicsGetImageFromCurrentImageContext() ?? UIImage()
UIGraphicsEndImageContext()
return image
}
}
然后在您的视图控制器中添加：
self.navigationController?.setNavigationBarBorderColor(UIColor.red)
从 iOS 13 开始，您可以使用 UINavigationBarAppearance() class 和 shadowColor 属性:
if #available(iOS 13.0, *) {
let style = UINavigationBarAppearance()
style.shadowColor = UIColor.clear // Effectively removes the border
navigationController?.navigationBar.standardAppearance = style
// Optional info for follow-ups:
// The above will override other navigation bar properties so you may have to assign them here, for example:
//style.buttonAppearance.normal.titleTextAttributes = [.font: UIFont(name: "YourFontName", size: 17)!]
//style.backgroundColor = UIColor.orange
//style.titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.white,
NSAttributedString.Key.font: UIFont(name: "AnotherFontName", size: 20.0)!]
} else {
// Fallback on earlier versions
}
Swift 4.0 - 5.2
的解决方案这是用于更改底部导航栏行的高度和颜色的小扩展
extension UINavigationController
{
func addCustomBottomLine(color:UIColor,height:Double)
{
//Hiding Default Line and Shadow
navigationBar.setValue(true, forKey: "hidesShadow")
//Creating New line
let lineView = UIView(frame: CGRect(x: 0, y: 0, width:0, height: height))
lineView.backgroundColor = color
navigationBar.addSubview(lineView)
lineView.translatesAutoresizingMaskIntoConstraints = false
lineView.widthAnchor.constraint(equalTo: navigationBar.widthAnchor).isActive = true
lineView.heightAnchor.constraint(equalToConstant: CGFloat(height)).isActive = true
lineView.centerXAnchor.constraint(equalTo: navigationBar.centerXAnchor).isActive = true
lineView.topAnchor.constraint(equalTo: navigationBar.bottomAnchor).isActive = true
}
}
添加此扩展后，您可以在任何 UINavigationController 上调用此方法（例如来自 ViewController viewDidLoad()）
self.navigationController?.addCustomBottomLine(color: UIColor.black, height: 20)
现在有更好的选择：
UINavigationBar.appearance().shadowImage = UIImage()
对于 iOS 13 岁及以后
guard let navigationBar = navigationController?.navigationBar else { return }
navigationBar.isTranslucent = true
if #available(iOS 13.0, *) {
let appearance = UINavigationBarAppearance()
appearance.configureWithTransparentBackground()
appearance.backgroundImage = UIImage()
appearance.backgroundColor = .clear
navigationBar.standardAppearance = appearance
} else {
navigationBar.setBackgroundImage(UIImage(), for: .default)
navigationBar.shadowImage = UIImage()
}