preface

The environment

Xcode 13.0  
iOS 15.0  
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The source code is available on Github and can be viewed directly at the bottom of the article

The solution

There are two main properties (UINavigationController properties)

// Static style
self.navigationBar.standardAppearance;
// Scroll styles
self.navigationBar.scrollEdgeAppearance;
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The main processing code for UINavigationController is listed below. If you want to see it all, download the source code at the bottom of this article

No headlines

import UIKit

/// Do not use headings
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(a) {
        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(a) {
        super.viewDidLoad()
        print(#function); }}Copy the code

Use a headline

import UIKit

/// use big headings
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(a) {
        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 static style
        self.navigationBar.standardAppearance = appearance
    }
    
    override func viewDidLoad(a) {
        super.viewDidLoad()
        print(#function);
    }
    
    func xq_scrollEdgeAppearance(_ appearance: UINavigationBarAppearance?). {
        // WXQ scroll style
        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 can be set for the first time
        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