导航条相关

监听返回按钮

/// 导航返回协议
@objc protocol NavigationProtocol {
    /// 导航将要返回方法
    ///
    /// - Returns: true: 返回上一界面， false: 禁止返回
    @objc optional func navigationShouldPopMethod() -> Bool
}

extension UIViewController: NavigationProtocol {
    func navigationShouldPopMethod() -> Bool {
        return true
    }
}

extension UINavigationController: UINavigationBarDelegate, UIGestureRecognizerDelegate {
    
    public func navigationBar(_ navigationBar: UINavigationBar, shouldPop item: UINavigationItem) -> Bool {
        if viewControllers.count < (navigationBar.items?.count)! {
            return true
        }
        var shouldPop = false
        let vc: UIViewController = topViewController!
        if vc.responds(to: #selector(navigationShouldPopMethod)) {
            shouldPop = vc.navigationShouldPopMethod()
        }
        if shouldPop {
            DispatchQueue.main.async {
                self.popViewController(animated: true)
            }
        } else {
            for subview in navigationBar.subviews {
                if 0.0 < subview.alpha && subview.alpha < 1.0 {
                    UIView.animate(withDuration: 0.25) {
                        subview.alpha = 1.0
                    }
                }
            }
        }
        return false
    }
    
    public func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        if childViewControllers.count == 1 {
            return false
        } else {
            if topViewController?.responds(to: #selector(navigationShouldPopMethod)) != nil {
                return topViewController!.navigationShouldPopMethod()
            }
            return true
        }
    }
}

多层级返回

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let des = self.navigationController?.viewControllers[(self.navigationController?.viewControllers.index((self.navigationController?.viewControllers.endIndex)!, offsetBy: -4))!]
self.navigationController?.popToViewController(des!, animated: false)

属性设置

设置返回按钮,只有一个箭头,或者自定义文字

1	self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: self, action: nil)

去除底部黑线

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

底部添加阴影

self.navigationController?.navigationBar.layer.shadowColor = COLOR_474744.cgColor
self.navigationController?.navigationBar.layer.shadowOffset = CGSize(width: 0, height: 5)
self.navigationController?.navigationBar.layer.shadowOpacity = 0.03
self.navigationController?.navigationBar.layer.shadowRadius = 3
self.navigationController?.navigationBar.layer.shadowPath = UIBezierPath.init(rect: (self.navigationController?.navigationBar.bounds)!).cgPath

改变文字颜色

1	self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: COLOR_474744]

改变背景颜色

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3

self.navigationController?.navigationBar.setBackgroundImage(imageFromColor(color: COLOR_18ceb4), for: UIBarPosition.any, barMetrics: .default)
或者用barTintColor
self.navigationController?.navigationBar.barTintColor = COLOR_18ceb4

改变透明

1	self.navigationController?.navigationBar.isTranslucent = false

改变默认的BarButtonItem的颜色
tintColor

NO Title!

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