为什么我的 NavigationBar 颜色在 Swift 中没有改变？

问题描述

我制作了一个自定义 NavigationBar 以在如下所示的所有屏幕上使用：

 import Foundation
 import UIKit

extension UIViewController {

func setUpNavigationBar() {

    self.navigationController?.navigationBar.backgroundColor = .yellow
    self.navigationController?.navigationBar.isTranslucent = false
    self.navigationController?.navigationBar.layer.masksToBounds = false
    
    let menuImageView = UIImageView.init(image: #imageLiteral(resourceName: "menu8"))
    menuImageView.tintColor = .darkGray
    menuImageView.frame = CGRect(x:0.0,y:0.0,width:25,height:25.0)
    menuImageView.contentMode = .scaleAspectFit
    menuImageView.widthAnchor.constraint(equalToConstant: 25).isActive = true
    menuImageView.heightAnchor.constraint(equalToConstant: 25).isActive = true
    menuImageView.addGestureRecognizer(UITapGestureRecognizer(target: self,action: #selector(menuClick)))
    let btnMenu = UIBarButtonItem(customView: menuImageView)
    
    self.navigationItem.setLeftBarButton(btnMenu,animated: true)
}

@objc func menuClick(){
    SideMenuController.preferences.basic.menuWidth = self.view.frame.width*0.8
    if !(self.sideMenuController?.isMenuRevealed ?? false){
        self.sideMenuController?.revealMenu()
    }
  }    
}

并像这样调用 SignupVC ViewWillAppear：

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(true)
          setUpNavigationBar()
}

使用上面的代码，我没有得到黄色 NavigationBar。我在 SignupVC 中得到 NavigationBar 就像唯一的白色。菜单没有leftbutton。为什么？我哪里错了？

谢谢。

解决方法

更改背景：

navigationController?.navigationBar.barTintColor = UIColor.yellow

测试正常 100%

此代码：

func setUpNavigationBar() {

    navigationController?.navigationBar.barTintColor = UIColor.yellow
    self.navigationController?.navigationBar.isTranslucent = false
    self.navigationController?.navigationBar.layer.masksToBounds = false
    
    let menuImageView = UIImageView.init(image: UIImage.init(named: "day")!)
    menuImageView.tintColor = .darkGray
    menuImageView.frame = CGRect(x:0.0,y:0.0,width:25,height:25.0)
    menuImageView.contentMode = .scaleAspectFit
    menuImageView.widthAnchor.constraint(equalToConstant: 25).isActive = true
    menuImageView.heightAnchor.constraint(equalToConstant: 25).isActive = true
    menuImageView.addGestureRecognizer(UITapGestureRecognizer(target: self,action: #selector(menuClick)))
    let btnMenu = UIBarButtonItem(customView: menuImageView)
    
    self.navigationItem.setLeftBarButton(btnMenu,animated: true)
}