Test for my first snippet.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Setup view controllers RootViewController *rootViewController = [[RootViewController alloc] init]; UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:rootViewController]; [navController.navigationBar setTintColor:[UIColor colorWithRed:0/255.0 green:51.0/255.0 blue:102.0/255.0 alpha:1.0]]; [navController.navigationBar setBarStyle:UIBarStyleBlackTranslucent]; self.navigationController = navController; [rootViewController release]; [navController release]; // Initialize Facebook facebook = [[Facebook alloc] initWithAppId:kAppId andDelegate:rootViewController]; // Check and retrieve authorization information NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; if ([defaults objectForKey:@"FBAccessTokenKey"] && [defaults objectForKey:@"FBExpirationDateKey"]) { facebook.accessToken = [defaults objectForKey:@"FBAccessTokenKey"]; facebook.expirationDate = [defaults objectForKey:@"FBExpirationDateKey"]; } // Initialize API data (for views, etc.) apiData = [[DataSet alloc] init]; // Initialize user permissions userPermissions = [[NSMutableDictionary alloc] initWithCapacity:1]; // Override point for customization after application launch. // Add the navigation controller's view to the window and display. self.window.rootViewController = self.navigationController; [self.window makeKeyAndVisible]; // Check App ID: // This is really a warning for the developer, this should not // happen in a completed app if (!kAppId) { UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Setup Error" message:@"Missing app ID. You cannot run the app until you provide this in the code." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; [alertView show]; [alertView release]; } else { // Now check that the URL scheme fb[app_id]://authorize is in the .plist and can // be opened, doing a simple check without local app id factored in here NSString *url = [NSString stringWithFormat:@"fb%@://authorize",kAppId]; BOOL bSchemeInPlist = NO; // find out if the sceme is in the plist file. NSArray* aBundleURLTypes = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleURLTypes"]; if ([aBundleURLTypes isKindOfClass:[NSArray class]] && ([aBundleURLTypes count] > 0)) { NSDictionary* aBundleURLTypes0 = [aBundleURLTypes objectAtIndex:0]; if ([aBundleURLTypes0 isKindOfClass:[NSDictionary class]]) { NSArray* aBundleURLSchemes = [aBundleURLTypes0 objectForKey:@"CFBundleURLSchemes"]; if ([aBundleURLSchemes isKindOfClass:[NSArray class]] && ([aBundleURLSchemes count] > 0)) { NSString *scheme = [aBundleURLSchemes objectAtIndex:0]; if ([scheme isKindOfClass:[NSString class]] && [url hasPrefix:scheme]) { bSchemeInPlist = YES; } } } } // Check if the authorization callback will work BOOL bCanOpenUrl = [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString: url]]; if (!bSchemeInPlist || !bCanOpenUrl) { UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Setup Error" message:@"Invalid or missing URL scheme. You cannot run the app until you set up a valid URL scheme in your .plist." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; [alertView show]; [alertView release]; } } return YES; }