Question

这是我完整的代码。 In PageViewController navigation not working

在这里，当我单击页面视图控制器的视图控制器中的按钮时，它将导航到下一个视图（最终视图控制器）。现在，我想更改导航栏的后退按钮。

当我单击ViewController中的按钮时，请参见上图[View controller将加载到PageViewController中]它将导航到FinalViewController

我的导航栏标题ViewController代码：

import Foundation
import Alamofire
import SwiftyJSON

class LoveltyAPI {

    let loveltyURL = Bundle.main.object(forInfoDictionaryKey: "APIUrlString") as! String  // Main URL
    let buildVersion = Bundle.main.object(forInfoDictionaryKey: "CFBundleShortVersionString") as! String  //infoDictionary?["CFBundleShortVersionString"] as AnyObject
    weak var delegate:LoveltyProtocol?  

    func get_profile(app_user_id:String, token:String) {
        let urlString = "\(loveltyURL)\(get_profile_string)?app_user_id=\(app_user_id)"
        let headers = ["Content-Type":"application/json","X-Requested-With":"XMLHttpRequest", "Authentication":"Token \(token)"]
        Alamofire.request(urlString, method: .get, encoding: JSONEncoding.default, headers: headers).responseJSON { response in
            switch response.result {
            case .success:
                let swiftyJsonVar = JSON(response.result.value!)
                switch response.response?.statusCode {
                case 200, 201:
                    self.delegate?.getUserProfile!(response: swiftyJsonVar["data"].dictionaryObject as AnyObject)
                case 401:
                    self.delegate?.tokenExpired(response: tokenExpired as AnyObject)
                case 404:
                    self.delegate?.serviceError!(response: swiftyJsonVar["message"] as AnyObject)
                case 422:
                    self.delegate?.serviceError!(response: swiftyJsonVar["error"] as AnyObject)
                case 503:
                    self.delegate?.appDisabled(response: swiftyJsonVar.dictionaryObject as AnyObject)
                default:
                    self.delegate?.serviceError!(response: self.serverError as AnyObject)
                }
            case .failure(let error):
                self.delegate?.serviceError!(response: self.serverError as AnyObject)
            }
        }
    }
}

但是此代码不起作用

Answer 1

后退按钮属于上一个视图控制器，而不是当前在屏幕上显示的那个。你可以使用委托或segue 参见this

Answer 2

这个答案很好用...

let storyboard = self.storyboard?.instantiateViewController(withIdentifier: "FVC")
let backButton = UIBarButtonItem()
backButton.title = "name"
(UIApplication.shared.keyWindow?.rootViewController as? UINavigationController)?.self.navigationBar.topItem?.backBarButtonItem = backButton
(UIApplication.shared.keyWindow?.rootViewController as? UINavigationController)?.pushViewController(storyboard!, animated: true)

UIPageViewController更改导航栏后退按钮标题

2 个答案: