ios facebook sdk 4.0登录错误代码304 [英] ios facebook sdk 4.0 login error code 304

问题描述

我刚刚更新了facebook sdk v4.0

I've just updated facebook sdk v4.0

并根据使用自定义登录UI

-(IBAction)facebookLoginClick:(id)sender {

FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];

[login logInWithReadPermissions:@[@"email"] handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {
    if (error) {
        // Process error
    } else if (result.isCancelled) {
        // Handle cancellations
    } else {
        // If you ask for multiple permissions at once, you
        // should check if specific permissions missing
        if ([result.grantedPermissions containsObject:@"email"]) {
            // Do work
        }
    }
}];
}

但结果总是为零，错误代码为304， am我错过了什么？

BUT the result is always nil and error code is 304, am I missing something?

推荐答案

我遇到了类似的问题。

初始化 FBSDKLoginManager 后，我添加了一行来清除数据和（Facebook）令牌：

After initialising FBSDKLoginManager I added a line to flush out the data and the (Facebook)Token:

FBSDKLoginManager *loginmanager= [[FBSDKLoginManager alloc]init];    
[loginmanager logOut];

希望这会有所帮助。

因此，就像OP要求的那样，我错过了什么吗？

Thus, exactly as the OP asks, "am I missing something"?

是的，以下标准示例代码随处可见，完全错了：

Yes, the following standard example code which is seen everywhere, is simply wrong:

-(IBAction)facebookLoginClick:(id)sender
{
FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];
---- ONE MAGIC LINE OF CODE IS MISSING HERE ----
[login logInWithReadPermissions:@[@"email"]
   handler:^(FBSDKLoginManagerLoginResult *result, NSError *error)
    {
    if (error) {...}
    else if (result.isCancelled) {...}
    else { // (NB for multiple permissions, check every one)
       if ([result.grantedPermissions containsObject:@"email"])
          { NSLog(@"%@",result.token); }
       }
}];
}

你必须这样做：

-(IBAction)facebookLoginClick:(id)sender
{
FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];
[login logOut];   //ESSENTIAL LINE OF CODE
[login logInWithReadPermissions:@[@"email"]
   handler:^(FBSDKLoginManagerLoginResult *result, NSError *error)
    {
    if (error) {...}
    else if (result.isCancelled) {...}
    else { // (NB for multiple permissions, check every one)
       if ([result.grantedPermissions containsObject:@"email"])
          { NSLog(@"%@",result.token); }
       }
}];
}

否则，非常简单，应用程序将无效如果用户碰巧在设备上更改FB帐户。 （除非他们因某些原因重新安装应用程序！）

Otherwise, very simply, the app will not work if the user happens to change FB accounts on the device. (Unless they happen to for some reason re-install the app!)

再一次 - 上面的流行示例代码根本不起作用（如果用户碰巧更改FB帐户，应用程序将进入无限循环。必须进行 logOut 调用。

Once again - the popular sample code above simply does not work (the app goes in to an endless loop) if a user happens to change FB accounts. The logOut call must be made.

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