- Update

Vendor/facebook-ios-sdk/samples/Scrumptious/scrumptious/SCLoginViewController.m

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+/*
+ * Copyright 2010-present Facebook.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "SCLoginViewController.h"
+#import "SCAppDelegate.h"
+#import "SCViewController.h"
+
+@implementation SCLoginViewController
+
+- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
+    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
+    if (self) {
+        // Facebook SDK * pro-tip *
+        // We wire up the FBLoginView using the interface builder
+        // but we could have also explicitly wired its delegate here.
+    }
+    return self;
+}
+
+- (void)viewWillAppear:(BOOL)animated {
+    [super viewWillAppear:animated];
+    
+    self.navigationController.navigationBarHidden = YES;
+}
+
+- (void)viewDidAppear:(BOOL)animated {
+    [super viewDidAppear:animated];
+    if (self.shouldSkipLogIn) {
+        [self performSelector:@selector(transitionToMainViewController) withObject:nil afterDelay:.5];
+    }
+}
+
+- (void)setShouldSkipLogIn:(BOOL)skip {
+    [[NSUserDefaults standardUserDefaults] setBool:skip forKey:@"ScrumptiousSkipLogIn"];
+    [[NSUserDefaults standardUserDefaults] synchronize];
+}
+
+- (BOOL)shouldSkipLogIn {
+    return [[NSUserDefaults standardUserDefaults] boolForKey:@"ScrumptiousSkipLogIn"];
+}
+
+- (void)viewWillDisappear:(BOOL)animated {
+    self.navigationController.navigationBarHidden = NO;
+}
+
+- (void)viewDidUnload {
+    [self setFBLoginView:nil];
+    [super viewDidUnload];
+}
+
+- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
+    return (interfaceOrientation == UIInterfaceOrientationPortrait);
+}
+
+- (void)transitionToMainViewController {
+    // this pop is a noop in some cases, and in others makes sure we don't try
+    // to push the same controller twice
+    [self.navigationController popToRootViewControllerAnimated:NO];
+
+    // Upon login, transition to the main UI by pushing it onto the navigation stack.
+    SCAppDelegate *appDelegate = (SCAppDelegate *)[UIApplication sharedApplication].delegate;
+    [self.navigationController pushViewController:appDelegate.mainViewController animated:YES];
+}
+
+#pragma mark - FBLoginView delegate
+
+- (void)loginViewShowingLoggedInUser:(FBLoginView *)loginView {
+    // if you become logged in, no longer flag to skip log in
+    self.shouldSkipLogIn = NO;
+    [self transitionToMainViewController];
+}
+
+- (void)loginView:(FBLoginView *)loginView
+      handleError:(NSError *)error{
+    NSString *alertMessage, *alertTitle;
+    
+    // Facebook SDK * error handling *
+    // Error handling is an important part of providing a good user experience.
+    // Since this sample uses the FBLoginView, this delegate will respond to
+    // login failures, or other failures that have closed the session (such
+    // as a token becoming invalid). Please see the [- postOpenGraphAction:]
+    // and [- requestPermissionAndPost] on `SCViewController` for further
+    // error handling on other operations.
+    
+    if (error.fberrorShouldNotifyUser) {
+        // If the SDK has a message for the user, surface it. This conveniently
+        // handles cases like password change or iOS6 app slider state.
+        alertTitle = @"Something Went Wrong";
+        alertMessage = error.fberrorUserMessage;
+    } else if (error.fberrorCategory == FBErrorCategoryAuthenticationReopenSession) {
+        // It is important to handle session closures as mentioned. You can inspect
+        // the error for more context but this sample generically notifies the user.
+        alertTitle = @"Session Error";
+        alertMessage = @"Your current session is no longer valid. Please log in again.";
+    } else if (error.fberrorCategory == FBErrorCategoryUserCancelled) {
+        // The user has cancelled a login. You can inspect the error
+        // for more context. For this sample, we will simply ignore it.
+        NSLog(@"user cancelled login");
+    } else {
+        // For simplicity, this sample treats other errors blindly, but you should
+        // refer to https://developers.facebook.com/docs/technical-guides/iossdk/errors/ for more information.
+        alertTitle  = @"Unknown Error";
+        alertMessage = @"Error. Please try again later.";
+        NSLog(@"Unexpected error:%@", error);
+    }
+    
+    if (alertMessage) {
+        [[[UIAlertView alloc] initWithTitle:alertTitle
+                                    message:alertMessage
+                                   delegate:nil
+                          cancelButtonTitle:@"OK"
+                          otherButtonTitles:nil] show];
+    }
+}
+
+- (void)loginViewShowingLoggedOutUser:(FBLoginView *)loginView {
+    // Facebook SDK * login flow *
+    // It is important to always handle session closure because it can happen
+    // externally; for example, if the current session's access token becomes
+    // invalid. For this sample, we simply pop back to the landing page.
+    SCAppDelegate *appDelegate = (SCAppDelegate *)[UIApplication sharedApplication].delegate;
+    if (appDelegate.isNavigating) {
+        // The delay is for the edge case where a session is immediately closed after
+        // logging in and our navigation controller is still animating a push.
+        [self performSelector:@selector(logOut) withObject:nil afterDelay:.5];
+    } else {
+        [self logOut];
+    }
+}
+
+- (void)logOut {
+    // on log out we reset the main view controller
+    SCAppDelegate *appDelegate = (SCAppDelegate *)[UIApplication sharedApplication].delegate;
+    [appDelegate resetMainViewController];
+    [self.navigationController popToRootViewControllerAnimated:YES];
+}
+
+- (IBAction)clickSkipLogIn:(id)sender {
+    self.shouldSkipLogIn = YES;
+    [self transitionToMainViewController];
+}
+@end