Facebook登录（Login Button）

facebook提供了一个及其简单的登录方式:Login Button（以下简称fbButton）:

这里就说一下如何使用fbButton:

1.先将facebook的sdk引入你的工程（可以去官网下载，然后拖拽或者使用Cocoapods引入）

2.去facebook创建你的app（https://developers.facebook.com/apps，官网有视频说明如何申请:http://developers.facebook.com/docs/getting-started/facebook-sdk-for-ios/3.1/）

3.创建好之后点击如下图所示按钮

点击Native iOS App这一栏，如图所示：

Bundle ID必须与你工程中.plist文件的Bundle identifier名称一样，App Store ID就是你app的itunes ID,记得下面勾选enabled。最后一个输入框可以不填写。

5.然后我们回到我们工程的.plist文件。添加下图所示信息

那串数字是你在facebook注册app时给你的id。

这样，准备工作就做好了。

然后添加一些代码：

首先，在appDelegate中，添加下面的代码：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{//...[FBLoginView class];return YES;
}

- (BOOL)application:(UIApplication *)applicationopenURL:(NSURL *)urlsourceApplication:(NSString *)sourceApplicationannotation:(id)annotation {// Call FBAppCall's handleOpenURL:sourceApplication to handle Facebook app responsesBOOL wasHandled = [FBAppCall handleOpenURL:url sourceApplication:sourceApplication];// You can add your app-specific url handling code here if neededreturn wasHandled;
}

然后，在你需要添加fbButton的类中添加下面的代码：

- (void)viewDidLoad
{[super viewDidLoad];// Create a FBLoginView to log the user in with basic, email and likes permissions// You should ALWAYS ask for basic permissions (basic_info) when logging the user in//[FBSettings setDefaultAppID:@"450051905053297"];FBLoginView *loginView = [[FBLoginView alloc] initWithReadPermissions:@[@"basic_info", @"email", @"user_likes"]];// Set this loginUIViewController to be the loginView button's delegateloginView.delegate = self;// Align the button in the center horizontallyloginView.frame = CGRectOffset(loginView.frame,(self.view.center.x - (loginView.frame.size.width / 2)),5);// Align the button in the center verticallyloginView.center = self.view.center;// Add the button to the view[self.view addSubview:loginView];
}
// This method will be called when the user information has been fetched
- (void)loginViewFetchedUserInfo:(FBLoginView *)loginViewuser:(id<FBGraphUser>)user {self.profilePictureView.profileID = user.id;self.nameLabel.text = user.name;
}// Implement the loginViewShowingLoggedInUser: delegate method to modify your app's UI for a logged-in user experience
- (void)loginViewShowingLoggedInUser:(FBLoginView *)loginView {self.statusLabel.text = @"You're logged in as";
}// Implement the loginViewShowingLoggedOutUser: delegate method to modify your app's UI for a logged-out user experience
- (void)loginViewShowingLoggedOutUser:(FBLoginView *)loginView {self.profilePictureView.profileID = nil;self.nameLabel.text = @"";self.statusLabel.text= @"You're not logged in!";
}// You need to override loginView:handleError in order to handle possible errors that can occur during login
- (void)loginView:(FBLoginView *)loginView handleError:(NSError *)error {NSString *alertMessage, *alertTitle;// If the user should perform an action outside of you app to recover,// the SDK will provide a message for the user, you just need to surface it.// This conveniently handles cases like Facebook password change or unverified Facebook accounts.if ([FBErrorUtility shouldNotifyUserForError:error]) {alertTitle = @"Facebook error";alertMessage = [FBErrorUtility userMessageForError:error];// This code will handle session closures since that happen outside of the app.// You can take a look at our error handling guide to know more about it// https://developers.facebook.com/docs/ios/errors} else if ([FBErrorUtility errorCategoryForError:error] == FBErrorCategoryAuthenticationReopenSession) {alertTitle = @"Session Error";alertMessage = @"Your current session is no longer valid. Please log in again.";// If the user has cancelled a login, we will do nothing.// You can also choose to show the user a message if cancelling login will result in// the user not being able to complete a task they had initiated in your app// (like accessing FB-stored information or posting to Facebook)} else if ([FBErrorUtility errorCategoryForError:error] == FBErrorCategoryUserCancelled) {NSLog(@"user cancelled login");// For simplicity, this sample handles other errors with a generic message// You can checkout our error handling guide for more detailed information// https://developers.facebook.com/docs/ios/errors} else {alertTitle  = @"Something went wrong";alertMessage = @"Please try again later.";NSLog(@"Unexpected error:%@", error);}if (alertMessage) {[[[UIAlertView alloc] initWithTitle:alertTitlemessage:alertMessagedelegate:nilcancelButtonTitle:@"OK"otherButtonTitles:nil] show];}
}

好了，完工

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