（（Xcode 10）iOS Facebook SDK：获取和显示用户的个人资料图片

Question

我正在使用Facebook的SDK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。我有以下情节提要和快捷文件：

• Main.storyboard＆ViewController.swift

• HomeAfterLogIn.storyboard和HomeAfterLogInViewController.swift

“ Main”包含用户用来登录的视图控制器，并且用户用来登录的代码如下：

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登录的按钮，如果用户在[]中输入成功的登录信息，则>]

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位置。 

我在Facebook Graph API网站上找到了此代码：

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有关。当我将此代码插入HomeAfterLogInViewController.swift文件时，只会产生以下错误：

我输入的密码有误吗？是swift的先前版本，我的是swift 4还是5？这是我第一次使用Facebook SDK，因此任何帮助都是好的！预先感谢！

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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
})

我正在使用Facebook的SDK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。我有以下情节提要和快捷文件：Main.storyboard＆...

Answer 1

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