ios facebook 用户信息

Question

你能帮我怎样才能得到用户信息。

  NSString *name;
[FBRequestConnection startForMeWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error)
    {
        if (!error)
        {
            // Success! Include your code to handle the results here
           name = [result objectForKey:@"first_name"]; // Error!!! how to get data from this handler
        }
        else
        {
            // An error occurred, we need to handle the error
            // See: https://developers.facebook.com/docs/ios/errors
        }

    }];

上述代码 - 异步？如何使其同步？告诉我有关机制或告诉我在哪里阅读。谢谢!

Answer 1

您可以在此站点上阅读有关 Facebook SDK 的所有内容:https://developers.facebook.com .

他们不提供同步 API，我什至不知道您为什么需要它。但如果你真的这样做了，你可以做一些解决方法。查看实现:

__block id result = nil;
dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);

[FBRequestConnection startForMeWithCompletionHandler:^(FBRequestConnection *connection, id theResult, NSError *error) {
    result = theResult;
    dispatch_semaphore_signal(semaphore);    // UPDATE: dispatch_semaphore_wait call was here, which is wrong
}];

dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
NSLog(@"%@", result);// this code will be launched after you've received response from Facebook

Result 符合FBGraphUser 协议(protocol)。因此，如果它不包含 first_name 键的值，用户就不会指定它。您可以在调试器中打印 result 并查看它是什么。