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wlgemini/SwiftyNavigationBar

An easy way to customizing NavigationBar.

SwiftyNavigationBar

SwiftyNavigationBar CI Version License Platform

An easy way to customizing NavigationBar.

Requirements

  • iOS 8.0+
  • Swift 5.0

Installation

CocoaPods

SwiftyNavigationBar is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'SwiftyNavigationBar'

Swift Package Manager

From Xcode 11, you can use Swift Package Manager to add SwiftyNavigationBar to your project.

dependencies: [
    .package(url: "https://github.com/wlgemini/SwiftyNavigationBar.git", .upToNextMajor(from: "5.1.0"))
]

Quick Start

首先,你需要用以下extension中的一个init来初始化UINavigationController:

// 1
init(preference: ((Style) -> Void)?)

// 2
init(rootViewController: UIViewController, preference: ((Style) -> Void)?)

// 3
init(viewControllers: [UIViewController], preference: ((Style) -> Void)?)

// 4
init(viewControllers: [UIViewController], toolbarClass: AnyClass?, preference: ((Style) -> Void)?)
let nav = UINavigationController(rootViewController: ViewController(), preference: nil)

⚠️注意,以上init方法内部接管了UINavigationControllerdelegate,请勿再重新设置delegate。如果有需要,可以通过nav.snb.navigationControllerDelegate来设置delegate。

接下来,你只要需要在UIViewControllerviewDidLoad()或调用更靠前的方法中做一些配置就好,这些配置项都以snb为前缀:

override func viewDidLoad() {
    super.viewDidLoad()
    
    self.snb.style.backgroundEffect = .color(.red)
    self.snb.style.backgroundAlpha = 0.5
    ...
}

当你想更新当前NavigationBar的样式时,需要调用snb.updateStyle()方法:

self.snb.updateStyle { (style) in
	style.isWhiteBarStyle = true
	style.shadowImageAlpha = 0.5
}

⚠️这里需要注意的是,snb.updateStyle()只作用于UINavigationController.topViewController,你当前的ViewController在栈顶时才会起作用。

Style

具体来说有以下样式可配置(PS: 这些GIF当中的样式都是通过snb.updateStyle()方法更新的):

  • backgroundEffect:改变背景样式,有Blur/Image/Color三类样式可选

    backgroundEffect

  • backgroundAlpha:改变背景透明度(并不是改变NavigationBar的透明度)

    backgroundAlpha

  • tintColor:改变NavigationBartintColor,主要影响左右两边BarButtonItem的颜色

    tintColor

  • isWhiteBarStyle:改变NavigationBarbarStyle,主要影响StatusBartitle

    isWhiteBarStyle

  • shadowImageAlpha:改变shadowImage的透明度

    shadowImageAlpha

  • alpha:改变NavigationBar的透明度(这会使得整个NavigationBar被隐藏掉)

    alpha

样式的综合使用

  • 🌰#1

    use1

  • 🌰#2

    use2

推荐用法

你并不需要在每个UIViewControllerviewDidLoad()方法中都进行一番相关样式的配置。

实际上,SwiftyNavigationBar提供了3种样式配置的作用域,选择一个合适的作用域,会使配置更便捷:

  • UIViewController作用域:在ViewController中,以snb.style开头的相关属性配置,它只会影响当前ViewController的样式

    override func viewDidLoad() {
        ...
        self.snb.style.backgroundAlpha = /* alpha */
        ...
    }
    
  • UINavigationController作用域:会作用于UINavigationController中的所有viewControllers

    let nav = UINavigationController(rootViewController: ViewController(), preference: { (style) in
        // 样式配置
        style.backgroundEffect = /* effect */
        ...
    })
    
  • Global作用域:会作用于所有通过相关init方法初始化的UINavigationController

    SwiftyNavigationBar.Style.backgroundEffect = /* effect */
    SwiftyNavigationBar.Style.tintColor = /* tintColor */
    SwiftyNavigationBar.Style.alpha = /* alpha */
    

他们的优先级是:UIViewController作用域 > UINavigationController作用域 > Global作用域

其中Global作用域有默认值,也就是说,UINavigationController作用域/UIViewController作用域可以不用配置或只配置一部分样式,剩下的样式配置使用Global作用域的配置即可。

所以一个比较推荐的用法如下:

// 第一步,配置Global作用域
SwiftyNavigationBar.Style.backgroundEffect = /* effect */

// 第二步,配置UINavigationController作用域
let nav1 = UINavigationController(rootViewController: ViewController(), preference: { (style) in
    style.backgroundEffect = /* effect */
    style.tintColor = /* tintColor */
})

let nav2 = UINavigationController(rootViewController: ViewController(), preference: nil)
nav2.snb.navigationControllerDelegate = self /* 等价于nav.delegate = self */

// 第三步,配置UIViewController作用域
override func viewDidLoad() {
    ...
    self.snb.style.backgroundAlpha = /* alpha */
    ...
}

Author

wlgemini, wangluguang@live.com

License

SwiftyNavigationBar is available under the MIT license. See the LICENSE file for more info.

Github

link
Stars: 13
Last commit: 2 weeks ago