使用FBGraphloginFacebook

我是iOS开发新手。 我想从我的iPhone应用程序连接到Facebook。 我遵循FBGraph API ，看看我们如何在我们的应用程序中使用Facebook：

打印login用户的信息：

FbGraphResponse *fb_graph_response = [fbGraph doGraphGet:@"me" withGetVars:nil]; NSLog(@"getMeButtonPressed: %@", fb_graph_response.htmlResponse); 

或朋友列表：

 FbGraphResponse *fb_graph_response = [fbGraph doGraphGet:@"me/friends" withGetVars:nil]; NSLog(@"getMeFriendsButtonPressed: %@", fb_graph_response.htmlResponse); 

这是doGraphGet方法：

 - (FbGraphResponse *)doGraphGet:(NSString *)action withGetVars:(NSDictionary *)get_vars { NSString *url_string = [NSString stringWithFormat:@"https://graph.facebook.com/%@?", action]; //tack on any get vars we have... if ( (get_vars != nil) && ([get_vars count] > 0) ) { NSEnumerator *enumerator = [get_vars keyEnumerator]; NSString *key; NSString *value; while ((key = (NSString *)[enumerator nextObject])) { value = (NSString *)[get_vars objectForKey:key]; url_string = [NSString stringWithFormat:@"%@%@=%@&", url_string, key, value]; }//end while }//end if if (accessToken != nil) { //now that any variables have been appended, let's attach the access token.... url_string = [NSString stringWithFormat:@"%@access_token=%@", url_string, self.accessToken]; } 

首先我们需要login到Facebook如图所示：

我想它在FbGraph.m中使用这个代码（使用UIWebView ）：

 self.redirectUri = @"http://www.facebook.com/connect/login_success.html"; - (void)authenticateUserWithCallbackObject:(id)anObject andSelector:(SEL)selector andExtendedPermissions:(NSString *)extended_permissions andSuperView:(UIView *)super_view { self.callbackObject = anObject; self.callbackSelector = selector; NSString *url_string = [NSString stringWithFormat:@"https://graph.facebook.com/oauth/authorize?client_id=%@&redirect_uri=%@&scope=%@&type=user_agent&display=touch", facebookClientID, redirectUri, extended_permissions]; NSURL *url = [NSURL URLWithString:url_string]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; CGRect webFrame = [super_view frame]; webFrame.origin.y = 0; UIWebView *aWebView = [[UIWebView alloc] initWithFrame:webFrame]; [aWebView setDelegate:self]; self.webView = aWebView; [aWebView release]; [webView loadRequest:request]; [super_view addSubview:webView]; } 

我的问题是关于一个可能性。 我可以自己有一个机制，从用户那里获取电子邮件和密码，然后login（如在控制台中打印的其他方法，authentication失败或成功login）？

Answer 1

点击button，它的事件是说fbLogin然后添加此代码进行login

 -(void)fbLogin { if(!self.fbGraph.accesstoken) // doesnot have access token. So needed to login { NSString *client_id = @"130902823636657"; //get your own client id from facebook //alloc and initalize our FbGraph instance self.fbGraph = [[FbGraph alloc] initWithFbClientID:client_id]; //begin the authentication process..... [self.fbGraph authenticateUserWithCallbackObject:self andSelector:@selector(fbGraphCallback:) andExtendedPermissions:@"user_photos,user_videos,publish_stream,offline_access,user_checkins,friends_checkins"]; } else { // Add UIAlert as user is logged in already //pop a message letting them know most of the info will be dumped in the log UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Note" message:@"user is logged in already" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil]; [alert show]; [alert release]; } } 

现在，当用户被authentication时，这个方法被调用。 所以在你的.h文件中添加这个方法。

 #pragma mark - #pragma mark FbGraph Callback Function /** * This function is called by FbGraph after it's finished the authentication process **/ - (void)fbGraphCallback:(id)sender { if ( (self.fbGraph.accessToken == nil) || ([self.fbGraph.accessToken length] == 0) ) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Note" message:@"Try Again" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil]; [alert show]; [alert release]; //restart the authentication process..... //[self.fbGraph authenticateUserWithCallbackObject:self andSelector:@selector(fbGraphCallback:) andExtendedPermissions:@"user_photos,user_videos,publish_stream,offline_access,user_checkins,friends_checkins"]; } else { //pop a message letting them know most of the info will be dumped in the log UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Note" message:@"Logged In Successfully" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil]; [alert show]; [alert release]; NSLog(@"------------>CONGRATULATIONS<------------, You're logged into Facebook... Your oAuth token is: %@", self.fbGraph.accessToken); } }