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copied!<p>Personally, rather than using NSUserDefaults which is fine for simple data, I would look into using the NSCoding protocol and NSKeyedArchiver. Have your objects implement the NSCoding protocol and then use something like this to archive/unarchive them:</p> <pre><code>+ (NSObject *)readArchiveFile:(NSString *)inFileName { NSFileManager *fileMgr = [NSFileManager defaultManager]; NSString *documentsDirectoryPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0]; NSString *filePath = [NSString stringWithFormat:@"%@/%@", documentsDirectoryPath, inFileName]; NSObject *returnObject = nil; if( [fileMgr fileExistsAtPath:filePath] ) { returnObject = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath]; } return returnObject; } + (void)archiveFile:(NSString *)inFileName inObject:(NSObject *)inObject { NSString *documentsDirectoryPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0]; NSString *filePath = [NSString stringWithFormat:@"%@/%@", documentsDirectoryPath, inFileName]; BOOL didSucceed = [NSKeyedArchiver archiveRootObject:inObject toFile:filePath]; if( !didSucceed ) { NSLog(@"File %@ write operation %@", inFileName, didSucceed ? @"success" : @"error" ); } } + (void)deleteFile:(NSString *)inFileName { NSFileManager *fileMgr = [NSFileManager defaultManager]; NSString *documentsDirectoryPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0]; NSString *filePath = [NSString stringWithFormat:@"%@/%@", documentsDirectoryPath, inFileName]; NSError *error; if ( [fileMgr fileExistsAtPath:filePath] && [fileMgr removeItemAtPath:filePath error:&error] != YES) { NSLog(@"Unable to delete file: %@", [error localizedDescription]); } } </code></pre> <p>Also, I would look into using CoreData as it gives you the ability to query your data.</p>

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