iOS與Facebook SDK連結，以及簡單貼文

第一步必須在AppDelegate的地方接住http近來之Handler，並將此url遞給Facebook物件：

//=====In appDelegate.m=======

- (BOOL)application:(UIApplication *)application

            openURL:(NSURL *)url

  sourceApplication:(NSString *)sourceApplication

         annotation:(id)annotation {

    // attempt to extract a token from the url

   

    //利用rootViewController來取得擁有Facebook物件之viewController

    UINavigationController* testing = (UINavigationController*)self.window.rootViewController;

    IndexViewController *controller = (IndexViewController*)[testing.viewControllers objectAtIndex:1];

    //將url遞給facebook物件，之後facebook之Delegate才會驅動fbDidLogin與fbDidLogout

    return [controller.facebook handleOpenURL:url];

}

接著在擁有Facebook物件之ViewController初始化facebook，並使用NSUserDefault來記錄登入的狀態：

- (void)viewDidLoad

{

    [super viewDidLoad];

    //Facebook物件初始化，並登入AppID

    facebook = [[Facebook alloc] initWithAppId:AppID andDelegate:self];

    //使用NSUserDefault來記錄登入狀態

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    //檢查是否有用過

    if ([defaults objectForKey:@"FBAccessToken"]

        &&[defaults objectForKey:@"FBExpirationDate"]) {

        //如果沒有重新開一個

        facebook.accessToken = [defaults objectForKey:@"FBAccessToken"];

        facebook.expirationDate = [defaults objectForKey:@"FBExpirationDate"];

    }

}

登入程序：

-(void)login

{

     //檢查Facebokk是否連線還在

     if (![facebook isSessionValid]) {

        //如果已經不再連線狀態，重新連線

        //定義需要的權限

        NSArray *permissions =  [NSArray arrayWithObjects:

                                 @"user_hometown", @"read_stream", @"user_birthday",

                                 @"user_about_me", @"publish_stream", @"offline_access", nil];

        //登入

        [facebook authorize:permissions];

    }else{

        //如果已經在登入狀態的話，擷取使用者資訊

        [facebook requestWithGraphPath:@"me" andDelegate:self];

    }

}

貼文程序：

-(void)postToWall

{

    NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys:

                                   AppID, @"app_id",

                                   @"http://www.google.com.tw/", @"link",

                                   @"http://www.google.com.tw/pic.jpg", @"picture",

                                   @"Facebook test", @"name",

                                   @"caption", @"caption",

                                   @"", @"description",

                                   @"",  @"message",

                                   nil];

    [facebook dialog:@"stream.publish" andParams:params andDelegate:self];

}

剩下一些FB之Delegate：

#pragma mark - FBRequestDelegate

- (void)requestLoading:(FBRequest *)request

{

    

}

- (void)request:(FBRequest *)request didReceiveResponse:(NSURLResponse *)response

{

    NSLog(@"received response:%@",response);

}

- (void)request:(FBRequest *)request didFailWithError:(NSError *)error

{

    

}

- (void)request:(FBRequest *)request didLoad:(id)result

{

    //利用Facebook物件request之資訊會傳遞到result，可以從這邊去收資料

    if ([result isKindOfClass:[NSArray class]] && [result count]>0) {

        result = [result objectAtIndex:0];

    }

    if ([result objectForKey:@"name"]){

        userName = [result objectForKey:@"name"];

    }

}

- (void)request:(FBRequest *)request didLoadRawResponse:(NSData *)data

{

    

}

//如果登入成功會呼叫此function

- (void)fbDidLogin {

    //擷取個人資訊，回饋資訊回從- (void)request:(FBRequest *)request didLoad:(id)result接收

    [facebook requestWithGraphPath:@"me" andDelegate:self];

    //將成功登入之資訊傳到NSUserDefault

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    [defaults setObject:[facebook accessToken] forKey:@"FBAccessToken"];

    [defaults setObject:[facebook expirationDate] forKey:@"FBExpirationDate"];

    [defaults synchronize];

}

-(void)fbDidLogout

{

    //登出時，清除帳戶資訊

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    if ([defaults objectForKey:@"FBAccessToken"]) {

        [defaults removeObjectForKey:@"FBAccessToken"];

        [defaults removeObjectForKey:@"FBExpirationDate"];

        [defaults synchronize];

    }

}