Question

我是iPhone编程的新手。使用下面的代码我登录Facebook并获取数据。但是这里的问题是如果点击Loginwithfacebook按钮Facebook对话框打开。我在那之后输入Facebook的用户名和密码点击相同的按钮，然后我得到用户数据。但我不想点击双倍的时间。也有一次我登录Facebook.inside应用程序，我想在那时获取用户数据我不登录再一次，直到我点击退出。请给我最好的主意。

-(void)LoginWithFacebookk:(id)sender
{ 
   if (!FBSession.activeSession.isOpen) {

    FBSession *session = [[FBSession alloc] init];
    // Set the active session
    [FBSession setActiveSession:session];
    // Open the session
    [session openWithBehavior:FBSessionLoginBehaviorForcingWebView
            completionHandler:^(FBSession *session,
                                FBSessionState status,
                                NSError *error)
     {


            }];

        }
        else
        {
            NSLog(@"open response");
            FBRequest* friendsRequest = [FBRequest requestForMe];
            [friendsRequest startWithCompletionHandler: ^(FBRequestConnection *connection,NSDictionary <FBGraphUser> *user,NSError *error) {

                NSString *emailiddd=[NSString stringWithFormat:@"%@",[user objectForKey:@"email"]];

                NSLog(@"%@",emailiddd);
                NSString *post = [NSString stringWithFormat:@"email=%@",emailiddd];

                NSLog(@"%@",post);

     }];
               }
    }
}

Answer 1

如果您在FacebookSDK查看Facebook提供的示例代码，则有一个示例SessionLoginSample请检查工作原理： -

你必须像这样配置你的应用程序： -

enter image description here

在原生iOS应用中，您必须设置您正在使用的应用程序包ID项目（例如， com.compame.projecname ）

实施你的项目在这里我把解释。

.h文件中的

使用IBOutlet创建一个按钮，并按照正常情况将此按钮连接到xib

#import <FacebookSDK/FacebookSDK.h>


@interface LoginViewController : UIViewController<FBLoginViewDelegate>
{
    IBOutlet UIButton *FB_login; // just connect IBoutlate no need to give IBAction
    FBLoginView *loginview;

}
@property (strong, nonatomic) id<FBGraphUser> loggedInUser;
@property (strong, nonatomic) IBOutlet FBProfilePictureView *profilePic; //this is for show profile pic or logged in user

.m文件中的

@implementation LoginViewController @synthesize profilePic = _profilePic;

- (void)viewDidLoad
{
    loginview = [[FBLoginView alloc] init];
    loginview =
    [[FBLoginView alloc] initWithPublishPermissions:[NSArray arrayWithObjects:@"publish_actions",@"email",nil] defaultAudience:FBSessionDefaultAudienceFriends];

    loginview.frame =FB_login.frame;//CGRectMake(90,149, 280, 55);
    for (id obj in loginview.subviews)
    {
        if ([obj isKindOfClass:[UIButton class]])
        {
            UIButton * loginButton =  obj;

            UIImage *loginImage = [UIImage imageNamed:@"btn_fb_login.png"];
            [loginButton setBackgroundImage:loginImage forState:UIControlStateNormal];
            [loginButton setBackgroundImage:nil forState:UIControlStateSelected];
            [loginButton setBackgroundImage:nil forState:UIControlStateHighlighted];
            [loginButton sizeToFit];
        }
        if ([obj isKindOfClass:[UILabel class]])
        {
            UILabel * loginLabel =  obj;
            loginLabel.text =@""; //@"Log in to facebook";
            loginLabel.textAlignment = NSTextAlignmentCenter;
            loginLabel.frame =CGRectMake(123,149, 280, 55);// CGRectMake(0, 0, 271, 37);
        }
    }

    loginview.delegate = self;

    [self.view addSubview:loginview];

    [super viewDidLoad];

}

-(void)LogOut:(NSNotification *)notif
{
    [self loginViewShowingLoggedOutUser:loginview];
    NSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    for (NSHTTPCookie *each in cookieStorage.cookies) {
        // put a check here to clear cookie url which starts with twitter and then delete it
        [cookieStorage deleteCookie:each];
    }
}

#pragma  mark------ FaceBook Sign In method------------

- (void)loginViewShowingLoggedInUser:(FBLoginView *)loginView {

    NSLog(@"Logged In");


}

- (void)loginViewFetchedUserInfo:(FBLoginView *)loginView
                            user:(id<FBGraphUser>)user {

    NSLog(@"%@",user);
    self.profilePic.profileID = user.id;





}
- (void)loginViewShowingLoggedOutUser:(FBLoginView *)loginView {
    // Called after logout
    NSLog(@"Logged out");

    self.profilePic.profileID = nil;
    [FBSession.activeSession closeAndClearTokenInformation];


}
- (void)loginView:(FBLoginView *)loginView handleError:(NSError *)error {
    // see https://developers.facebook.com/docs/reference/api/errors/ for general guidance on error handling for Facebook API
    // our policy here is to let the login view handle errors, but to log the results
    NSLog(@"FBLoginView encountered an error=%@", error);
}

注意： - 如果您尝试使用FBProfilePictureView设置登录用户的图像，请不要忘记将[FBProfilePictureView class];添加到应用代理中，例如Bellow

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { [FBProfilePictureView class]; // Override point for customization after application launch. return YES; }

以下是您的示例代码 Sample code Facebook log-in with Image

Answer 2

如果您愿意，也可以使用Parse：

- (IBAction)facebookRegistrationButtonPressed {

        // The permissions requested from the user

        NSArray *permissionsArray = @[@"email", @"user_about_me", @"publish_actions", @"status_update", @"manage_pages", @"publish_stream"];

        // Login PFUser using Facebook
        [PFFacebookUtils logInWithPermissions:permissionsArray block:^(PFUser *user, NSError *error) {
            if (!user) {
                if (!error) {
                    NSLog(@"Uh oh. The user cancelled the Facebook login.");
                } else {
                    NSLog(@"Uh oh. An error occurred: %@", error);
                }
            } else if (user.isNew) {
                NSLog(@"User with facebook signed up and logged in!");
                [self processFacebookRequest];
            } else {
                NSLog(@"User with facebook logged in!");
                [self processFacebookRequest];
            }
        }];
    }

    - (void)processFacebookRequest {
        FBRequest *request = [FBRequest requestForMe];
        // Send request to Facebook
        [request startWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
            if (!error) {
                // result is a dictionary with the user's Facebook data
                NSDictionary *userData = (NSDictionary *)result;
                NSString * email = [result objectForKey:@"email"];

                NSString *facebookID = userData[@"id"];
                NSLog(@"facebookID = %@", facebookID);

            } else {
                NSLog(@"error : %@", error.localizedDescription);
            }
        }];
    }

我无法从iOS中的Facebook获取用户数据

2 个答案: