Cancel Local Notification

Cancel all local notifications with this code:

[[UIApplication sharedApplication] cancelAllLocalNotifications];

Cancel one local notification with this line of code:

[[UIApplication sharedApplication] cancelLocalNotification:theNotification];

Delete a File in Documents Directory

iPhone SDK Tips & Tricks

To access the secondary directory in the documents directory:

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectoryPath = [paths objectAtIndex:0];

NSString *secondaryDirectoryPath = [documentsDirectoryPath stringByAppendingPathComponent:@"secondary"];

NSString *databaseFile = [secondaryDirectoryPath stringByAppendingPathComponent:@"database.db"];

NSFileManager *fileManager = [NSFileManager defaultManager];

[fileManager removeItemAtPath:databaseFile error:NULL];