xcode 13.0，手机系统 iOS15, push卡顿（图片如下）

1. 设置navigationBar背景颜色
   navBar.backgroundColor = .white

2. 在navigationBar添加一个view，覆盖statusBar背景颜色
   statusBarView = UIView(frame: CGRect(x: 0, y: -kStatusBarHeight, width: SCREEN_WIDTH, height: kStatusBarHeight))
   statusBarView.backgroundColor = .white
   self.navigationBar.addSubview(statusBarView)

   
   
   image.png

import UIKit

class BaseNavigationController: UINavigationController {

    var statusBarView: UIView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let navBar = UINavigationBar.appearance()
        navBar.backgroundColor = .white
        // 设置false之后自动下沉navigationBar 高度
        self.navigationBar.isTranslucent = false
        // 设置navigationBar的背景色
        navBar.barTintColor = .white
        // 设置左右bar的颜色
        navBar.tintColor = UIColor(white: 51/255.0, alpha: 1)
        // 消除 navigation 阴影 (即 navigation 下面的黑线)
        navBar.shadowImage = UIImage()
        // 设置标题的样式
        let attriDic = [NSAttributedString.Key.font:UIFont.boldSystemFont(ofSize: 18),NSAttributedString.Key.foregroundColor:UIColor(white: 16/255.0, alpha: 1)]
        navBar.titleTextAttributes = attriDic
        
        statusBarView = UIView(frame: CGRect(x: 0, y: -kStatusBarHeight, width: SCREEN_WIDTH, height: kStatusBarHeight))
        statusBarView.backgroundColor = .white
        self.navigationBar.addSubview(statusBarView)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        
    }
    
    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
        // 不是第一级vc
        if viewControllers.count > 0 {
            viewController.hidesBottomBarWhenPushed = true
            // 可以在这里设置返回按钮等,重写后侧滑返回失效需要自己单独处理
            // backBarButtonItem 是带有字和返回箭头的样式
            viewController.navigationItem.leftBarButtonItem = UIBarButtonItem(image: UIImage(named: "arrow_back"), style: .plain, target: self, action: #selector(navBackAction))
            self.interactivePopGestureRecognizer?.delegate = self as? UIGestureRecognizerDelegate
        }
        
        //一定要写在最后，要不然无效
        super.pushViewController(viewController, animated: animated)
    }

    // 返回操作
    @objc func navBackAction(){
        popViewController(animated: true)
    }
}