iOS 15 navigation bar (Navigation) becomes white (navigation bar is missing)

foreword

environment

Xcode 13.0  
iOS 15.0  
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The source code is placed on github. If you want to see it, you can go directly to the bottom of the article

Solution

Mainly the following two properties (properties of UINavigationController)

// 静止样式
self.navigationBar.standardAppearance;
// 滚动样式
self.navigationBar.scrollEdgeAppearance;
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Only the main processing code of UINavigationController is listed below. If you want to see all, you can go to the bottom of the article to download the source code

no big headlines

import UIKit

/// 不使用大标题
class TestOneNC: UINavigationController {
    
    override init(rootViewController: UIViewController) {
        super.init(rootViewController: rootViewController)
        print(#function);
        self.xq_init()
    }
    
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        print(#function);
        self.xq_init()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        print(#function);
        self.xq_init()
    }
    
    func xq_init() {
        print(#function);
        self.navigationBar.prefersLargeTitles = false
        self.navigationBar.barTintColor = .red;
        self.navigationBar.tintColor = .green
        
        let appearance = UINavigationBarAppearance.init()
        appearance.configureWithOpaqueBackground()
        appearance.backgroundColor = UIColor.red
        appearance.shadowImage = UIImage.init()
        appearance.shadowColor = UIColor.clear
        self.navigationBar.standardAppearance = appearance
        self.navigationBar.scrollEdgeAppearance = appearance
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        print(#function);
    }
    
}
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big title used

import UIKit

/// 使用大标题
class TestNC: UINavigationController {
    
    var appearance_test: UINavigationBarAppearance?
    
    override init(rootViewController: UIViewController) {
        super.init(rootViewController: rootViewController)
        print(#function);
        self.xq_init()
    }
    
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        print(#function);
        self.xq_init()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        print(#function);
        self.xq_init()
    }
    
    func xq_init() {
        print(#function);
        self.navigationBar.prefersLargeTitles = true
        self.navigationBar.barTintColor = .red;
        self.navigationBar.isTranslucent = true
        self.navigationBar.tintColor = .green
        
        let appearance = UINavigationBarAppearance.init()
        appearance.configureWithOpaqueBackground()
        appearance.backgroundColor = UIColor.red
        appearance.shadowImage = UIImage.init()
        appearance.shadowColor = UIColor.clear
        self.appearance_test = appearance
        // wxq 静止样式
        self.navigationBar.standardAppearance = appearance
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        print(#function);
    }
    
    func xq_scrollEdgeAppearance(_ appearance: UINavigationBarAppearance?) {
        // wxq 滚动样式
        self.navigationBar.scrollEdgeAppearance = appearance
    }
    
    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
        print(#function, self.viewControllers);
        if self.viewControllers.count >= 1 {
            viewController.hidesBottomBarWhenPushed = true;
            viewController.navigationItem.largeTitleDisplayMode = .never;
        }
        
        // wxq 第一次设置即可
        if self.viewControllers.count == 1 {
            self.xq_scrollEdgeAppearance(self.appearance_test)
        }
        
        super.pushViewController(viewController, animated: animated)
    }
    
    override func popToRootViewController(animated: Bool) -> [UIViewController]? {
        print(#function, self.viewControllers);
        self.xq_scrollEdgeAppearance(nil)
        return super.popToRootViewController(animated: animated)
    }
    
    override func popViewController(animated: Bool) -> UIViewController? {
        print(#function, self.viewControllers);
        if self.viewControllers.count <= 2 {
            self.xq_scrollEdgeAppearance(nil)
        }
        return super.popViewController(animated: animated)
    }

}

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project

XQNavigationBar15BlankDemo project address