我无法从iOS中的Facebook获取用户数据

Question

我是iPhone编程的新手.使用下面的代码我登录到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的用户名和密码如果再次点击相同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再登录直到我点击退出.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

如果您正在检查Facebook提供的示例代码,FacebookSDK那么有一个示例SessionLoginSample请检查工作原理: -

你必须像这样配置你的应用程序: -

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

为实现你的项目在这里我把解释.

在.h文件中创建一个按钮,IBOutlet并按正常方式将此按钮连接到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

在.m文件中 @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: - 如果您尝试使用登录用户设置图像,FBProfilePictureView请不要忘记添加[FBProfilePictureView class];到应用程序代理,如Bellow

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

这里是一个示例代码 示例代码Facebook使用Image登录