iOS：使用Facebook登錄並打開Native Facebook應用程序

Question

• 我希望在登錄時打開facebook應用程序，該應用程序已安裝在設備中進行登錄驗證，但始終在Safari瀏覽器中打開。

- 點擊Facebook按鈕

    -(void)loginButtonClicked
        {
            FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];

        //    [login setLoginBehavior:FBSDKLoginBehaviorNative];

                [login logInWithReadPermissions:@[@"email"] fromViewController:self handler:^(FBSDKLoginManagerLoginResult *result, NSError *error)
                 {
                     if (error)
                     {
                         NSLog(@"Login process error");
                     }
                     else if (result.isCancelled)
                     {
                         NSLog(@"User cancelled login");
                     }
                     else
                     {
                         NSLog(@"Login Success");
                         if ([result.grantedPermissions containsObject:@"email"])
                         {
                             NSLog(@"result is:%@",result);
                             [self fetchUserInfo];
                         }
                         else
                         {
        //                     [SVProgressHUD showErrorWithStatus:@"Facebook email permission error"];
                         }
                     }
                 }];
            }
        }

- 獲取用戶信息

        -(void)fetchUserInfo
        {
            if ([FBSDKAccessToken currentAccessToken])
            {
                NSLog(@"Token is available : %@",[[FBSDKAccessToken currentAccessToken]tokenString]);

                [[[FBSDKGraphRequest alloc] initWithGraphPath:@"me" parameters:@{@"fields": @"id, name, email"}]
                 startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, id result, NSError *error) {
                     if (!error)
                     {
                         NSLog(@"results:%@",result);

                         NSString *email = [result objectForKey:@"email"];
                         NSString *userId = [result objectForKey:@"id"];

                         if (email.length >0 )
                         {
                             NSString *accessToken = [[FBSDKAccessToken currentAccessToken] tokenString];
                             [ref authWithOAuthProvider:@"facebook" token:accessToken
                                    withCompletionBlock:^(NSError *error, FAuthData *authData)
                              {
                                        if (error)
                                        {
                                            NSLog(@"Login failed. %@", error);
                                        }
                                        else
                                        {
                                            NSLog(@"Logged in! %@", authData);

                                            //Start you app Todo
                                        }
                         else
                         {
                             NSLog(@"Facebook email is not verified");
                         }
                     }
                     else
                     {
                         NSLog(@"Error %@",error);
                     }
                 }];

        }

• 我想用Facebook登錄facebook應用程序登錄。

Answer 1

從V4.6.0它不會重定向到fb應用程序。 見下文

（v4.6.0 - 2015年9月10日）此外，SDK對話框（如Login，Like，Share Dialogs）會根據設備自動確定最佳UI，包括SFSafariViewController而不是Safari。 按照我們的准備iOS 9指南。

Answer 2

請使用FBLoginView作為Facebook登錄按鈕它會自動檢測Facebook應用程序，您可以使用Facebook登錄。 Facebook SDK中提供FBLoginView類。

Answer 3

請正確設置info.plist參數，您可能沒有提供這樣的URL

<array>
        <dict>
            <key>CFBundleURLSchemes</key>
            <array>
                <string>fb776035152513539</string>
            </array>
        </dict>
</array>

和

<key>FacebookAppID</key>
<string>776035152513539</string>

如果您無法達到您想要的效果，那么您可以使用這些類。

頭文件 -

//
//  LxFaceBookHandler.h
//  KickOffSlotMachine
//
//  Created by Prakhar Goyal on 06/08/15.
//  Copyright (c) 2015 LOGICNEXT. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <FBSDKCoreKit/FBSDKCoreKit.h>
#import <FBSDKLoginKit/FBSDKLoginKit.h>

typedef NS_ENUM(NSInteger,LOGINRESPONSE)
{
    LOGINRESPONSE_ERROR,
    LOGINRESPONSE_CANCEL,
    LOGINRESPONSE_SUCCESS
};

@protocol LxFaceBookHandlerDelegate <NSObject>

-(void)DidLogInWithResponse:(LOGINRESPONSE)type;

@end

@interface LxFaceBookHandler : NSObject

@property(weak,nonatomic)id<LxFaceBookHandlerDelegate>delegate;
-(void)InitFaceBookLogin;

//Called from app Delegate

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions;

@end

和實施文件是 -

//
//  LxFaceBookHandler.m
//  KickOffSlotMachine
//
//  Created by Prakhar Goyal on 06/08/15.
//  Copyright (c) 2015 LOGICNEXT. All rights reserved.
//

#import "LxFaceBookHandler.h"

@implementation LxFaceBookHandler
@synthesize delegate =  __delegate;

- (instancetype)init
{
    self = [super init];
    if (self)
    {
        __delegate = nil;
    }
    return self;
}

-(void)InitFaceBookLogin;
{
    FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];
    [login logInWithReadPermissions:@[@"email"] handler:^(FBSDKLoginManagerLoginResult *result, NSError *error)
     {
         if (error)
         {
             if (__delegate!=nil)
             {
                 if ( [__delegate respondsToSelector:@selector(DidLogInWithResponse:)])
                 {
                     [__delegate DidLogInWithResponse:LOGINRESPONSE_ERROR];
                 }
             }
         }
         else if (result.isCancelled)
         {
             if (__delegate!=nil)
             {
                 if ( [__delegate respondsToSelector:@selector(DidLogInWithResponse:)])
                 {
                     [__delegate DidLogInWithResponse:LOGINRESPONSE_CANCEL];
                 }
             }
         }
         else
         {
             if (__delegate!=nil)
             {
                 if ( [__delegate respondsToSelector:@selector(DidLogInWithResponse:)])
                 {
                     [__delegate DidLogInWithResponse:LOGINRESPONSE_SUCCESS];
                 }
             }

             //             if ([result.grantedPermissions containsObject:@"email"]) {
             //                 // Do work
             //             }
         }
     }];

}

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
    return [[FBSDKApplicationDelegate sharedInstance] application:application
                                                          openURL:url
                                                sourceApplication:sourceApplication
                                                       annotation:annotation];

}

-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
   return [[FBSDKApplicationDelegate sharedInstance] application:application didFinishLaunchingWithOptions:launchOptions];
}

@end

在您的項目中添加FBSDKCoreKit.Framework和FBSDKLoginKit.Framework並設置您的應用程序Delefate，如下所示 -

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.backgroundColor=[UIColor blackColor];

 SplashViewController *rVC = [[SplashViewController alloc] initWithNibName:@"SplashViewController" bundle:nil];

    self.mNavController=[[UINavigationController alloc]initWithRootViewController:rVC];
    [self.mNavController setNavigationBarHidden:YES];

    self.window.rootViewController=self.mNavController;
    [self.window makeKeyAndVisible];

    self.handler = [[LxFaceBookHandler alloc]init];



    [self.handler application:application didFinishLaunchingWithOptions:launchOptions];
    return YES;
}
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
    return [self.handler application:application openURL:url sourceApplication:sourceApplication annotation:annotation];
}

現在你可以使用這些類作為按鈕點擊上的任何事件 -

- (IBAction)FacebookLoginPressed:(UIButton *)sender
{
    App.handler.delegate  = self;
    [App.handler InitFaceBookLogin];
}