Facebook登录无法快速工作

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【中文标题】Facebook登录无法快速工作【英文标题】：Facebook login not working in swift 【发布时间】：2016-10-11 05:10:59 【问题描述】：

我正在尝试在我的应用中实现 Facebook 登录，但当我尝试登录时，它会转到 Facebook 应用并返回我的游戏，但登录按钮不会变为注销，并且如果我尝试获取任何信息，例如访问权限令牌，授予权限或拒绝权限它是零。这是我的代码：

import Foundation
class IntroScene: SKScene, FBSDKLoginButtonDelegate 
let loginButton: FBSDKLoginButton = 
    let button = FBSDKLoginButton()
    button.readPermissions = ["email"]
    return button
()

override func didMove(to view: SKView) 
    self.backgroundColor = UIColor.black

    view.addSubview(loginButton)
    loginButton.center = (self.view?.center)!
    loginButton.delegate = self


func loginButtonDidLogOut(_ loginButton: FBSDKLoginButton!) 



func loginButtonWillLogin(loginButton: FBSDKLoginButton!) -> Bool 
    return true


func loginButton(_ loginButton: FBSDKLoginButton!, didCompleteWith result: FBSDKLoginManagerLoginResult!, error: Error!) 
    if(error == nil)
    
        print("login complete")
        //print(FBSDKAccessToken.current()) -> crashes because its nil
        //print(result.grantedPermissions) -> crashes its nil
    
    else
        print(error.localizedDescription)

我的 info.plist 如下所示：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>UIViewControllerBasedStatusBarAppearance</key>
    <false/>
    <key>LSApplicationQueriesSchemes</key>
    <array>
        <string>fbapi</string>
        <string>fb-messenger-api</string>
        <string>fbauth2</string>
        <string>fbshareextension</string>
    </array>
    <key>NSAppTransportSecurity</key>
    <dict>
        <key>NSExceptionDomains</key>
        <dict>
            <key>facebook.com</key>
            <dict>
                <key>NSIncludesSubdomains</key>
                <true/>
                <key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
                <false/>
            </dict>
            <key>fbcdn.net</key>
            <dict>
                <key>NSIncludesSubdomains</key>
                <true/>
                <key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
                <false/>
            </dict>
            <key>akamaihd.net</key>
            <dict>
                <key>NSIncludesSubdomains</key>
                <true/>
                <key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
                <false/>
            </dict>
        </dict>
    </dict>
    <key>CFBundleURLTypes</key>
    <array>
        <dict>
            <key>CFBundleURLSchemes</key>
            <array>
            <string>//fbmyid</string>
        </array>
    </dict>
</array>
<key>FacebookAppID</key>
<string>//myid</string>
<key>FacebookDisplayName</key>
<string>Crazy Traffic Saga</string>
<key>CFBundleDevelopmentRegion</key>
<string>en</string>
<key>CFBundleExecutable</key>
<string>$(EXECUTABLE_NAME)</string>
<key>CFBundleIdentifier</key>
<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
<key>CFBundleInfoDictionaryVersion</key>
<string>6.0</string>
<key>CFBundleName</key>
<string>$(PRODUCT_NAME)</string>
<key>CFBundlePackageType</key>
<string>APPL</string>
<key>CFBundleShortVersionString</key>
<string>1.0</string>
<key>CFBundleSignature</key>
<string>????</string>
<key>CFBundleVersion</key>
<string>1</string>
<key>LSRequiresIPhoneOS</key>
<true/>
<key>UILaunchStoryboardName</key>
<string>LaunchScreen</string>
<key>UIMainStoryboardFile</key>
<string>Main</string>
<key>UIRequiredDeviceCapabilities</key>
<array>
    <string>armv7</string>
</array>
<key>UISupportedInterfaceOrientations</key>
<array>
    <string>UIInterfaceOrientationPortrait</string>
    <string>UIInterfaceOrientationLandscapeLeft</string>
    <string>UIInterfaceOrientationLandscapeRight</string>
</array>
<key>UISupportedInterfaceOrientations~ipad</key>
<array>
    <string>UIInterfaceOrientationPortrait</string>
    <string>UIInterfaceOrientationPortraitUpsideDown</string>
    <string>UIInterfaceOrientationLandscapeLeft</string>
    <string>UIInterfaceOrientationLandscapeRight</string>
</array>

【问题讨论】：

您使用哪个 swift 版本？ 不够好，无法为您提供完整的解决方案，所以在这里。试试看，edbinx.com/apple/ios/… 我正在使用 Swift 3 @HimanshuMoradiya 我基本上在做本教程的第一部分，但无法让它工作@Fennec 【参考方案1】：

感谢这篇文章：FB Login using Swift 3 not returning any values and not get back the user to the App after successful login 我发现了问题。还有一个功能应该添加到 App Delegate 中。 这是我如何让 Facebook 登录工作

下载SDK并添加到项目中

根据Facebook网站设置info.plist

在应用程序中添加了委托：

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool 
// Override point for customization after application launch.
FIRApp.configure()
FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)

return true


public func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool 

    return FBSDKApplicationDelegate.sharedInstance().application(
        app,
        open: url as URL!,
        sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String,
    annotation: options[UIApplicationOpenURLOptionsKey.annotation]
)


public func application(_ application: UIApplication, open url: URL,     sourceApplication: String?, annotation: Any) -> Bool 
        return FBSDKApplicationDelegate.sharedInstance().application(
            application,
            open: url as URL!,
            sourceApplication: sourceApplication,
            annotation: annotation)

在 SKScene 中，我正在显示按钮（也可以在视图控制器中）：

class IntroScene: SKScene, FBSDKLoginButtonDelegate 
    override func didMove(to view: SKView) 
        self.backgroundColor = UIColor.black
        let loginButton = FBSDKLoginButton()
        loginButton.center = (self.view?.center)!
        self.view?.addSubview(loginButton)
        loginButton.frame = CGRect(x: 0, y: 0, width: 360, height: 60) // makes it bigger
        loginButton.center = CGPoint(x: self.frame.midX, y: self.frame.midY + 90)
        loginButton.delegate = self
        loginButton.readPermissions = ["public_profile", "email"]
        if let _ = FBSDKAccessToken.current()
            //already logged in 
            fetchProfile()
        
    
    func fetchProfile() 
    let parameters = ["fields": "first_name, email, last_name, picture"]

    FBSDKGraphRequest(graphpath: "me", parameters: parameters).start(completionHandler:  (connection, user, requestError) -> Void in

        if requestError != nil 
            print("----------ERROR-----------")
            print(requestError)
            return
        
        let userData = user as! NSDictionary
        let email = userData["email"] as? String
        let firstName = userData["first_name"] as? String
        let lastName = userData["last_name"] as? String
        var pictureUrl = ""
        if let picture = userData["picture"] as? NSDictionary, let data = picture["data"] as? NSDictionary, let url = data["url"] as? String 
            pictureUrl = url
            print(pictureUrl)
        
     )

【讨论】：

【参考方案2】：

将此代码放入您的 AppDelegate.swift 

 func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool 
      return FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
 



func application(application: UIApplication, openURL url: NSURL, sourceApplication: String?, annotation: AnyObject) -> Bool 
        return FBSDKApplicationDelegate.sharedInstance().application(application, openURL: url, sourceApplication:  sourceApplication, annotation: annotation)

在您的 Facebook Button Click ViewController 中检查 FacebookAccessToken。

if FBSDKAccessToken.currentAccessToken() != nil 
            FBSDKLoginManager().logOut()
            return


let login:FBSDKLoginManager = FBSDKLoginManager()
login.logInWithReadPermissions(["email"], handler:  (result:FBSDKLoginManagerLoginResult!, error:NSError!) -> Void in
     if(error != nil)
            FBSDKLoginManager().logOut()
     else if(result.isCancelled)
            FBSDKLoginManager().logOut()
     else
                //Handle login success
            self.returnUserData()
        
 )

获取 FacebookData 的响应。

func returnUserData()

  let graphRequest : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "email"])
  graphRequest.startWithCompletionHandler( (connection, result, error) -> Void in
      if ((error) != nil)
      
            // Process error
            print("Error: \(error)")
       
       else
       
            print(result)

        
    )

【讨论】：

我已经有了 App Delegate 代码（抱歉，我忘了在问题中包含）。对于中间部分，我应该把代码放在哪里？我需要一个视图控制器还是可以使用我正在使用的 SKScene？我应该把它放在哪里？视图加载？当我尝试添加它时，我也收到此错误无法将类型“（FBSDKLoginManagerLoginResult！，NSError！）-> Void”的值转换为预期的参数类型“FBSDKLoginManagerRequestTokenHandler！” @toiavalle 我不使用 swift 3.0 我正在使用 swift 2.0，所以他们可能从你身边然后转换此代码以便在 swift 3.0 中正常工作。谢谢。【参考方案3】：

现在 Facebook 为您的 iOS 应用程序提供 Swift sdk。 Swift sdk for Facebook

检查一下，玩得开心

【讨论】：

【参考方案4】：

不要忘记设置 Keychain Sharing 项目目标 -> Capabilities -> Keychain Sharing -> Toggle Switch ON Keychain Sharing status

你可以关注这个http://ashishkakkad.com/2015/05/facebook-login-swift-language-ios/

【讨论】：

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