Code snippet to save array data using NSKeyedArchiver

CCJFileEngine.m

// save array data
- (void)saveArrayData {
    
    NSMutableDictionary *dataDict = [[NSMutableDictionary alloc] initWithCapacity:365];
    if (urgeArray != nil) {
        [dataDict setObject:urgeArray forKey:@"events"];  // save the urges array
    }
    
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectoryPath = [paths objectAtIndex:0];
    NSString *filePath = [documentsDirectoryPath stringByAppendingPathComponent:@"eventData"];
    
    [NSKeyedArchiver archiveRootObject:dataDict toFile:filePath];
}

// restore event data
- (void)restoreUrgeDataArrayInitialized {
    // look for saved data.
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectoryPath = [paths objectAtIndex:0];
    NSString *filePath = [documentsDirectoryPath stringByAppendingPathComponent:@"eventData"];
    
    if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
        NSData *data = [NSData dataWithContentsOfFile:filePath];
        NSDictionary *savedData = [NSKeyedUnarchiver unarchiveObjectWithData:data];
        
        if ([savedData objectForKey:@"events"] != nil) {
            eventArray = [[NSMutableArray alloc] initWithArray:[savedData objectForKey:@"events"]];
        } else {
            NSLog(@"restoreEventData: NO SAVED DATA");
            eventArray = [[NSMutableArray alloc] init];
        }
        
    } else {
        NSLog(@"restoreEventData: NO FILE");
        eventArray = [[NSMutableArray alloc] init];
    }
}