Storing Custom Objects in NSUserDefaults

gistfile1.txt

// View did load

    NSData *data = [[NSUserDefaults standardUserDefaults] dataForKey:@"array"];
    arrayOfFaceObjects = [NSMutableArray arrayWithArray:[NSKeyedUnarchiver unarchiveObjectWithData:data]];

    if (!arrayOfFaceObjects.count)
    {
        arrayOfImages = [NSMutableArray arrayWithObjects:@"1.png", @"2.jpg", @"3.jpg", @"4.jpg", @"5.jpg", @"6.jpg", @"8.jpg", @"9.jpg", @"10.jpg", @"11.jpg", @"12.jpg", @"13.jpg", @"14.jpg", @"15.jpg", nil];

        //Converts arrayOfImages to arrayOfFaceObjects
        for (NSString *imageString in arrayOfImages)
        {
            [self detectFace:imageString];
        }
        
        NSData *data = [NSKeyedArchiver archivedDataWithRootObject:arrayOfFaceObjects];
        [[NSUserDefaults standardUserDefaults] setObject:data forKey:@"array"];
    }
    
    
    // Custom object methods m file
    
    - (void)encodeWithCoder:(NSCoder *)encoder {
    //Encode properties, other class variables, etc
    [encoder encodeCGRect:self.frameOfHead forKey:@"frameOfHead"];
    [encoder encodeFloat:self.faceAngle forKey:@"faceAngle"];
    [encoder encodeObject:self.filePath forKey:@"filePath"];
}

- (id)initWithCoder:(NSCoder *)decoder {
    if((self = [super init])) {
        //decode properties, other class vars
        self.frameOfHead = [decoder decodeCGRectForKey:@"frameOfHead"];
        self.faceAngle = [decoder decodeFloatForKey:@"faceAngle"];
        self.filePath = [decoder decodeObjectForKey:@"filePath"];
    }
    return self;
}