Facebook iOS SDK：使用Facebook登录失败

Question

在网上阅读了一些参考文献之后，我决定使用Facebook SDK for iOS代替XCode Social Framework 。

因为我需要在应用程序上执行“使用facebook登录”会话，并且正在遵循Sample文件夹下名为SessionLoginSample的示例代码，但是在我放置代码时它不起作用。 这些代码已在iPad模拟器上成功构建，但是当我单击按钮时，什么也没有发生。

你能告诉我我在哪里想念...谢谢...

我有这个AppDelegate.h ：

#import <UIKit/UIKit.h>
#import <FacebookSDK/FacebookSDK.h>

@class ViewController;

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) ViewController *viewController;

@property (strong, nonatomic) FBSession *session;

@end

这是我的AppDelegate.m ：

#import "AppDelegate.h"
#import "ViewController.h"

@implementation AppDelegate

@synthesize window = _window;
@synthesize viewController = _viewController;
@synthesize session = _session;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}

- (void)applicationWillResignActive:(UIApplication *)application
{
}

- (void)applicationDidEnterBackground:(UIApplication *)application
{
}

- (void)applicationWillEnterForeground:(UIApplication *)application
{
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    [FBAppEvents activateApp];
    [FBAppCall handleDidBecomeActiveWithSession:self.session];
}

- (void)applicationWillTerminate:(UIApplication *)application
{
    [self.session close];
}


- (BOOL)application:(UIApplication *)application
            openURL:(NSURL *)url
  sourceApplication:(NSString *)sourceApplication
         annotation:(id)annotation {
    // attempt to extract a token from the url
    return [FBAppCall handleOpenURL:url
                  sourceApplication:sourceApplication
                        withSession:self.session];
}

#pragma mark Template generated code

@end

我的ViewController.h ：

#import <UIKit/UIKit.h>
#import <FacebookSDK/FacebookSDK.h>

@interface ViewController : UIViewController
@property (strong, nonatomic) IBOutlet UITextField *fieldEmail;
@property (strong, nonatomic) IBOutlet UITextField *fieldPassword;
@property (strong, nonatomic) IBOutlet UILabel *titleLogin;
@property (strong, nonatomic) IBOutlet UILabel *labelOutput;

- (IBAction)buttonRegister;
- (IBAction)buttonLogin;
- (IBAction)loginFacebook;
- (IBAction)loginTwitter;

@end

我的ViewController.m ：

#import "ViewController.h"
#import "AppDelegate.h"

@interface ViewController ()

@property (strong, nonatomic) UINavigationController* navController;

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

- (void) alertWithTitle:(NSString *)title andMessage:(NSString *)msg
{
    UIAlertView *message = [[UIAlertView alloc] initWithTitle:title
                                                      message:msg
                                                     delegate:nil
                                            cancelButtonTitle:@"OK"
                                            otherButtonTitles:nil];
    [message show];
}

- (IBAction)loginFacebook {
    AppDelegate *appDelegate = [[UIApplication sharedApplication]delegate];

    if (appDelegate.session.isOpen) {
        [appDelegate.session closeAndClearTokenInformation];

    } else {
        if (appDelegate.session.state != FBSessionStateCreated) {
            appDelegate.session = [[FBSession alloc] init];
        }

        [appDelegate.session openWithCompletionHandler:^(FBSession *session,
                                                         FBSessionState status,
                                                         NSError *error) {
            [self alertWithTitle:(@"FB Login") andMessage:(@"It works!!")];
        }];
    } }
}
@end

更新：我在我的项目的Framework文件夹下添加了FacebookSDK.framework，也基于此介绍修改了plist文件：

Answer 1

在我看来，您的使命是像-setActiveSession这样的调用

if (appDelegate.session.state != FBSessionStateCreated) 
{
   appDelegate.session = [[FBSession alloc] init];
   [FBSession setActiveSession:appDelegate.session];
}

一个月前，我在集成iOS Facebook sdk 3.5时遇到了同样的问题，并且发现您当前的活动会话不会自动设置。 因此，只要有机会获得不同的会话实例，我都会拨打此电话。

也，

内

    - (void)applicationDidBecomeActive:(UIApplication *)application
   {
      [FBAppEvents activateApp];
      [FBAppCall handleDidBecomeActiveWithSession:self.session];
   }

您应该使用FBSession.activeSession而不是self.session来确保FBAppCall获得与FBSession相同的实例，并为其获取结果。

希望能有所帮助。