在Swift中更改大标题导航栏的字体

class ViewController: UIViewController, UINavigationControllerDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        navigationController?.delegate = self
    }
}

func navigationController(_ navigationController: UINavigationController, willDisplay viewController: UIViewController, animated: Bool) {
    let largeTitleAttributes = [
        NSAttributedString.Key.font: UIFont(name: "Helvetica-Bold", size: 30) // 设置字体和大小
    ]
    navigationController.navigationBar.largeTitleTextAttributes = largeTitleAttributes as [NSAttributedString.Key : Any]
}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    navigationController?.navigationBar.prefersLargeTitles = true
}

import UIKit

class ViewController: UIViewController, UINavigationControllerDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        navigationController?.delegate = self
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        navigationController?.navigationBar.prefersLargeTitles = true
    }
    
    func navigationController(_ navigationController: UINavigationController, willDisplay viewController: UIViewController, animated: Bool) {
        let largeTitleAttributes = [
            NSAttributedString.Key.font: UIFont(name: "Helvetica-Bold", size: 30)
        ]
        navigationController.navigationBar.largeTitleTextAttributes = largeTitleAttributes as [NSAttributedString.Key : Any]
    }
}