iOS：Facebook登录访问令牌错误：由于模拟器错误，从NSUserDefaults返回加载访问令牌 [英] iOS: Facebook Login access token error: Falling back to loading access token from NSUserDefaults because of simulator bug

问题描述

根据我继续收到此错误的说明进行配置后，我无法在我的应用上成功使用Facebook登录。我正在XCode 8.1上运行，并使用iOS 10.1模拟器。

After configuring it based on the instructions I keep on getting this error and I am unable to successfully use Facebook Login on my app. I am running it on XCode 8.1 and using an iOS 10.1 simulator.

我按照Facebook iOS SDK指南中的步骤，将Facebook登录按钮放在我的视图控制器中。我显示了NSUserdefaults，其中一个关键是com.facebook.sdk：serverConfiguration，所以我相信它正在保存。

I followed the steps on the Facebook iOS SDK guide and put the Facebook login button in my view controller. I displayed the NSUserdefaults and one of the keys is "com.facebook.sdk:serverConfiguration" so I believe it is saving there.

- (void)viewDidLoad {
    [super viewDidLoad];
    if ([FBSDKAccessToken currentAccessToken]) {
        // User is logged in, do work such as go to next view controller.
        NSLog(@"test");
    }
    else {
        FBSDKLoginButton *loginButton = [[FBSDKLoginButton alloc] init];
        loginButton.center = self.view.center;
        [self.view addSubview:loginButton];
    }
    _loginButton.readPermissions =
    @[@"public_profile", @"email", @"user_friends"];
    NSLog(@"%@", [[NSUserDefaults standardUserDefaults] dictionaryRepresentation]);
}

推荐答案

如果问题是iOS模拟器在重新启动应用程序后退出，这是由Facebook SDK中的错误引起的。它可以防止模拟器缓存访问令牌。

If the problem is that the iOS Simulator is signed out after a restart of the app, this is caused by a bug in the Facebook SDK. It prevents the simulator from caching the access token.

您可以通过添加以下行来修复此问题：

You can fix this by adding the following line:

key = [NSString stringWithFormat：@％@ _ fix，key];

在 FBSDKKeychainStore.m：94 和 FBSDKKeychainStore.m：135
就在之前：

in FBSDKKeychainStore.m:94 and FBSDKKeychainStore.m:135 just before:

[[NSUserDefaults standardUserDefaults] setObject：value forKey：key];

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