SwiftUI Facebook 登录：如何在视图中获取 Facebook id？

Posted 2023-03-17

【中文标题】SwiftUI Facebook 登录：如何在视图中获取 Facebook id？

【英文标题】：SwiftUI Facebook Login: How to get the Facebook id back in the View?

【发布时间】：2021-01-18 20:14:58

【问题描述】：

我正在使用How to login to Facebook on SwiftUI? 中的以下代码在我的应用程序中使用 Facebook 登录。效果很好，除了我找不到将 id 和访问令牌取回我的视图的方法，我需要在其中更新变量。

我的代码：

LoginView.swift

import SwiftUI
// Facebook Login
import FBSDKLoginKit
import FacebookLogin

[...]

// Facebook Login
let facebookLoginButton = FBLoginButton(frame: .zero, permissions: [.publicProfile])

struct LoginView: View 
    
    @EnvironmentObject var viewRouter: ViewRouter
    
    // Facebook Login
    @ObservedObject var fbmanager = UserLoginManager()

    var body: some View 

        [...]
        Button(action: 
            self.fbmanager.facebookLogin()
        ) 
            FacebookButtonContent(buttonWidth: 120, buttonHeight: 60, buttonRadius: 15)
        
        [...]
    


[...]

// Facebook Login
class UserLoginManager: ObservableObject 
    
    let loginManager = LoginManager()
    
    func facebookLogin() 
        loginManager.logIn(permissions: [.publicProfile, .email], viewController: nil)  loginResult in
            switch loginResult 
            case .failed(let error):
                print(error)
            case .cancelled:
                print("User cancelled login.")
            case .success(let grantedPermissions, let declinedPermissions, let accessToken):
                print("Logged in! \(grantedPermissions) \(declinedPermissions) \(accessToken)")
                                
                GraphRequest(graphpath: "me", parameters: ["fields": "id, name, first_name"]).start(completionHandler:  (connection, result, error) -> Void in
                    if (error == nil)
                        let fbDetails = result as! NSDictionary
                        print(fbDetails)
                        let fbUserId = fbDetails["id"] ?? ""
                        let fbAccessToken = AccessToken.current?.tokenString ?? ""
                    
                )

                // 
                // QUESTION: how to get the fbUserId and fbAccessToken here ???
                // 
            
        
    

这是我卡住的地方：我想在 GraphRequest 调用之后获取 fbUserId 和 fbAccessToken，以便我的函数 facebookLogin 可以返回它们。我该怎么做？

感谢您的帮助！

【参考方案1】：

我找到了如何做到这一点，在这里发布解决方案：

我将facebookLogin函数修改如下：

facebookLogin(_ completion: @escaping (String) -> ())

完整的UserLoginManager类代码：

// Facebook Login
class UserLoginManager: ObservableObject 
    
    let loginManager = LoginManager()
    
    func facebookLogin(_ completion: @escaping (String) -> ()) 
        loginManager.logIn(permissions: [.publicProfile, .email], viewController: nil)  loginResult in
            switch loginResult 
            case .failed(let error):
                print(error)
                completion("")
            case .cancelled:
                print("User cancelled login.")
                completion("")
            case .success(let grantedPermissions, let declinedPermissions, let accessToken):
                print("Logged in! \(grantedPermissions) \(declinedPermissions) \(accessToken)")
                                
                GraphRequest(graphPath: "me", parameters: ["fields": "id, name, first_name"]).start(completionHandler:  (connection, result, error) -> Void in
                    if (error == nil)
                        let fbDetails = result as! NSDictionary
                        print(fbDetails)
                        let fbUserId = fbDetails["id"] ?? ""
                        let fbAccessToken = AccessToken.current?.tokenString ?? ""

                        let fbResult = "id=\(fbUserId)&accessToken=\(fbAccessToken)"
                        completion(fbResult)
                    
                    else
                    
                        completion("")
                    
                )
            
        
    

然后在我的按钮中我做了以下操作：

Button(action: 
            self.fbmanager.facebookLogin  (completionData) in
            // Do operation with String
            print(completionData);
        
) 
   FacebookButtonContent(buttonWidth: 120, buttonHeight: 60, buttonRadius: 15)

希望这可以帮助其他有同样问题的人...