ios - 我无法在 iOS 中从 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 Facebook 并获取数据。但这里的问题是如果单击 Loginwithfacebook 按钮 Facebook 对话框打开。如果再次单击相同，我将输入 Facebook 的用户名和密码按钮，然后我正在获取用户数据。但我不想点击两次。而且一旦我登录 Facebook.inside 应用程序，我想在那个时候获取用户数据，我不会再登录一次直到我点击注销。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

如果您正在查看 FacebookSDK 中 Facebook 提供的示例代码有一个样本SessionLoginSample请检查是如何工作的:-

您必须像这样配置您的应用程序:-



在 native iOS 应用程序中，您必须设置您在项目中使用的应用程序包 ID，例如( com.compame.projecname )

为了实现到您的项目中，我在这里进行了解释。

在 .h 文件中 使用 IBOutlet 创建一个按钮并像往常一样将此按钮连接到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 登录 View Controller
@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不要忘记添加 [FBProfilePictureView class];像贝娄一样进入应用程序代表

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

这是给你的示例代码 Sample code Facebook log-in with Image