ios - 在 iOS Facebook SDK 中获取并显示用户的个人资料图片

Question

我正在使用 Facebook 的 SDK 来允许用户登录我的应用程序，我希望该应用程序显示用户的个人资料图片。我有以下 Storyboard和 Swift 文件:

• Main.storyboard 和 ViewController.swift

• HomeAfterLogIn.storyboard 和 HomeAfterLogInViewController.swift

“Main”包含用户登录的 View Controller ，用户登录的代码如下:

import UIKit
import FacebookLogin

class ViewController: UIViewController
{
    override func viewDidLoad()
    {
        super.viewDidLoad()

        if AccessToken.current != nil
        {
            // Already logged-in
            // Redirect to Home View Controller
            goToHome()
        }

        // Add LoginButton
        let loginButton = FBLoginButton(permissions: [ .publicProfile, .email, .userFriends ])
        let screenSize:CGRect = UIScreen.main.bounds
        let screenHeight = screenSize.height // real screen height
        //let's suppose we want to have 10 points bottom margin
        let newCenterY = screenHeight - loginButton.frame.height - 20
        let newCenter = CGPoint(x: view.center.x, y: newCenterY)
        loginButton.center = newCenter
        view.addSubview(loginButton)

        // Triggered after every successfully login / logout
        NotificationCenter.default.addObserver(forName: .AccessTokenDidChange, object: nil, queue: OperationQueue.main) { [weak self] _ in
            if AccessToken.current != nil {
                // Successfully just Logged in
                // Redirect to Home View Controller
                self?.goToHome()
            } else {
                // Successfully just Logged out
            }
        }
    }

    func goToHome() {
        let storyboard = UIStoryboard(name: "HomeAfterLogIn", bundle: nil)
        let vc = storyboard.instantiateViewController(withIdentifier: "HomeAfterLogInViewController") // I called mine like that (check screenshot below)
        self.navigationController?.pushViewController(vc, animated: true)
    }
}

此代码显示使用 Facebook 登录按钮以及用户是否输入成功登录

func goToHome()

将用户发送到 HomeAfterLogIn.storyboard，这是我希望显示用户个人资料图片的地方。

我在 Facebook Graph API 网站上找到了这段代码:

FBSDKGraphRequest *request = [[FBSDKGraphRequest alloc]
    initWithGraphPath:@"/100046232170264/picture"
           parameters:@{ @"redirect": @"false",}
           HTTPMethod:@"GET"];
[request startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, id result, NSError *error) {
    // Insert your code here
}];

上面的值与我的应用程序相关。当我将此代码插入到 HomeAfterLogInViewController.swift 文件中时，只会产生以下错误:

我输入的代码是否错误？它是 Swift 的早期版本吗？我的是 Swift 4 或 5？这是我第一次使用 Facebook SDK。

对帖子发表评论后

(Keshu R.)将 obj-c 转换为 Swift:

let request = FBSDKGraphRequest(graphPath: "/100046232170264/picture", parameters: [
    "redirect": "false"
], httpMethod: "GET")
request.start(withCompletionHandler: { connection, result, error in
    // Insert your code here
})

(Karol Zmysłowski)代码错误:

(Keshu R.)HomeAfterLogIn.storyboard 中的 UI 项目:

Answer 1

import FacebookCore
import FacebookLogin

Profile.loadCurrentProfile(completion: { profile, error in
    if let profile = profile {
        let imageURL = profile.imageURL(forMode: .square, size: CGSize(width: 200.0, height: 200.0))
    }
})