rightBarButtonItem 图像未显示

Question

任何人都可以帮助我了解我的代码中有什么问题。我没有得到它我的代码编译正常没有任何错误但是我的图像没有显示 up.I 我确定我的图像存在于 Assests 文件夹中并且我给出了正确的名称我的图像也是如此。我正在以编程方式进行。下面是我的代码-:

*AppDelegate-:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        windowLayout()
        application.statusBarStyle = .lightContent
        return true
    }

    func windowLayout()
    {
        window = UIWindow(frame: UIScreen.main.bounds)
        window?.makeKeyAndVisible()

        let layout = UICollectionViewFlowLayout()
        window?.rootViewController = UINavigationController(rootViewController: HomeController(collectionViewLayout: layout))
        UINavigationBar.appearance().barTintColor = UIColor(colorLiteralRed: 238/255, green: 32/255, blue: 31/255, alpha: 1)
        let statusBarView = UIView()
        statusBarView.backgroundColor = UIColor(colorLiteralRed: 194/255, green: 31/255, blue: 31/255, alpha: 1)
        window?.addSubview(statusBarView)
        window?.translatesAutoresizingMaskIntoConstraints = false
        //window?.addConstraintsWithFormat(format: "H:|[v0]|", views: statusBarView)
        //window?.addConstraintsWithFormat(format: "V:|[v0(20)]", views: statusBarView)
        UINavigationBar.appearance().shadowImage = UIImage()
        //UINavigationBar.appearance().setBackgroundImage(UIImage(),forBarMatrics: .default)
    }

扩展文件-:

import UIKit


protocol navigationBarItems {
    func searchBarButton()
    func handleMoreButton()
}


extension UINavigationController:navigationBarItems
{
    func handleMoreButton() {

    }

    func searchBarButton()
    {
        let searchBarImage = UIImage(named: "search-icon")?.withRenderingMode(UIImageRenderingMode.alwaysTemplate)
        let searchImage = UIBarButtonItem(image: searchBarImage, style: UIBarButtonItemStyle.done, target: self, action: #selector(handleSearch))
        navigationItem.rightBarButtonItem = searchImage

    }

    func handleSearch()
    {
        print("123")
    }

}

控制器class-:

class HomeController: UICollectionViewController,UICollectionViewDelegateFlowLayout {

    override func viewDidLoad() {
        super.viewDidLoad()
        setUpLayout()
        setUpMenuBar()
        fetchJsonData()
        navigationController?.searchBarButton()
    }

我已经通过设置断点来检查我的函数是否被调用进行了测试。它工作正常，但图像未显示，请帮助。

Answer 1

尝试扩展 UIViewController 而不是 UINavigationController

extension UIViewController:navigationBarItems
{
    func handleMoreButton() {

    }

    func searchBarButton()
    {
        let searchBarImage = UIImage(named: "search-icon")?.withRenderingMode(UIImageRenderingMode.alwaysTemplate)
        let searchImage = UIBarButtonItem(image: searchBarImage, style: UIBarButtonItemStyle.done, target: self, action: #selector(handleSearch))
        navigationItem.rightBarButtonItem = searchImage

    }

    func handleSearch()
    {
        print("123")
    }

}

现在从`viewDidLoad``调用这个方法

class HomeController: UICollectionViewController,UICollectionViewDelegateFlowLayout {

    override func viewDidLoad() {
        super.viewDidLoad()
        setUpLayout()
        setUpMenuBar()
        fetchJsonData()
        self.searchBarButton()
    }

rightBarButtonItem 图像未显示

rightBarButtonItem image not showing up

ios

swift3

uinavigationcontroller

uitabbaritem