Question

我在iOS中第一次使用facebook SDK。我试图关注Facebook Documentations以登录用户：Login Tutorial和Getting Started。

我在按下按钮时向新视图控制器添加FBLoginView以提示用户登录。我面临的问题是，在FBLoginView创建后，我立即被带到两个FBLoginViewDelegate方法： loginViewShowingLoggedOutUser：和 loginView：handleError： < / p>

loginView:handleError:将错误列为FBErrorCategoryUserCancelled，而我从未取消任何请求！用于登录的模态弹出窗口显示2秒钟，然后自动解除取消状态。

我真的无法理解为什么会这样。我在模拟器上测试它。我在.plist文件中需要所有3个密钥用于Facebook SDK集成。为什么请求会自动取消？请帮我解决这个问题..谢谢。

代码：

#import "FBLoginViewController.h"

@interface FBLoginViewController ()

@end

@implementation FBLoginViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.

    FBLoginView *loginview = [[FBLoginView alloc] initWithReadPermissions:[NSArray arrayWithObjects:@"basic_info",@"user_photos",@"friend_photos", nil]];
    loginview.frame = CGRectOffset(loginview.frame, (self.view.center.x - (loginview.frame.size.width / 2)), 5);
    loginview.delegate = self;
    [self.view addSubview:loginview];
}

#pragma mark - FBLoginDelegate

-(void) loginViewFetchedUserInfo:(FBLoginView *)loginView user:(id<FBGraphUser>)user
{
    NSLog(@"user info: %@",user);
}

-(void) loginViewShowingLoggedInUser:(FBLoginView *)loginView
{
     NSLog(@"User logged in");
}

-(void) loginViewShowingLoggedOutUser:(FBLoginView *)loginView
{
     NSLog(@"User logged out");//Logs on console
}

-(void) loginView:(FBLoginView *)loginView handleError:(NSError *)error
{
    NSString *alertMessage, *alertTitle;

    // If the user should perform an action outside of you app to recover,
    // the SDK will provide a message for the user, you just need to surface it.
    // This conveniently handles cases like Facebook password change or unverified Facebook accounts.
    if ([FBErrorUtility shouldNotifyUserForError:error]) {
        alertTitle = @"Facebook error";
        alertMessage = [FBErrorUtility userMessageForError:error];

        // This code will handle session closures that happen outside of the app
        // You can take a look at our error handling guide to know more about it
        // https://developers.facebook.com/docs/ios/errors
    } else if ([FBErrorUtility errorCategoryForError:error] == FBErrorCategoryAuthenticationReopenSession) {
        alertTitle = @"Session Error";
        alertMessage = @"Your current session is no longer valid. Please log in again.";

        // If the user has cancelled a login, we will do nothing.
        // You can also choose to show the user a message if cancelling login will result in
        // the user not being able to complete a task they had initiated in your app
        // (like accessing FB-stored information or posting to Facebook)
    } else if ([FBErrorUtility errorCategoryForError:error] == FBErrorCategoryUserCancelled) {
        NSLog(@"user cancelled login");

        // For simplicity, this sample handles other errors with a generic message
        // You can checkout our error handling guide for more detailed information
        // https://developers.facebook.com/docs/ios/errors
    } else {
        alertTitle  = @"Something went wrong";
        alertMessage = @"Please try again later.";
        NSLog(@"Unexpected error:%@", error);
    }

    if (alertMessage) {
        [[[UIAlertView alloc] initWithTitle:alertTitle
                                    message:alertMessage
                                   delegate:nil
                          cancelButtonTitle:@"OK"
                          otherButtonTitles:nil] show];
    }
}

@end

Answer 1

奇怪，但它对我有用。在viewDidLoad中，我更改了FBLoginView的初始化：

FBLoginView *loginview = [[FBLoginView alloc] initWithReadPermissions:[NSArray arrayWithObjects:@"basic_info",@"user_photos",@"friend_photos", nil]];

为：

FBLoginView *loginview = [[FBLoginView alloc] init];

无权限初始化会立即启动模式弹出窗口。

Answer 2

问题可能是你的列表中的最后一项是零。

无法登录加载FBLoginView

2 个答案: