Read and Write Plist File in Objective-C, converted from Swift version written by Rebeloper http://rebeloper.com/read-write-plist-file-swift/

ReadAndWritePlistFile.m

//
//  ViewController.m
//  ReadAndWritePlistFile
//
//  Created by Keita on 3/3/15.
//  Copyright (c) 2015 Keita Ito. All rights reserved.
//  converted from Swift version written by Rebeloper http://rebeloper.com/read-write-plist-file-swift/


#import "ViewController.h"

static NSString *const BedroomFloorKey = @"BedroomFloor";
static NSString *const BedbroomWallkey = @"BedroomWall";

@interface ViewController ()

@property (nonatomic, assign) NSInteger bedroomFloorID;
@property (nonatomic, assign) NSInteger bedroomWallID;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.bedroomFloorID = 101;
    self.bedroomWallID = 101;
    // Do any additional setup after loading the view, typically from a nib.
    
    [self loadGameData];
}

- (void)loadGameData {
    
    // getting path to GameDAta.plist
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths firstObject];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"GameData.plist"];
    
    NSFileManager *fileManager = [NSFileManager defaultManager];
    //check if file exists
    if (![fileManager fileExistsAtPath:path]) {
        NSLog(@"path doesn't exist. plist file will be copied to the path.");
        // If it doesn't, copy it from the default file in the Bundle
        NSString *bundlePath = [[NSBundle mainBundle] pathForResource:@"GameData" ofType:@"plist"];
        if (bundlePath) {
            NSLog(@"file exists in the main bundle.");
//            NSMutableDictionary *resultDictionary = [NSMutableDictionary dictionaryWithContentsOfFile:bundlePath];
            NSDictionary *resultDictionary = [NSDictionary dictionaryWithContentsOfFile:bundlePath];
            NSLog(@"Bundle GameData.plist file is --> %@", [resultDictionary description]);
            // copy dictionary from main bundle to document directory path
            [fileManager copyItemAtPath:bundlePath toPath:path error:nil];
            NSLog(@"plist file is copied from main bundle to document directory");
        } else {
            NSLog(@"GameData.plist not found in main bundle. Please, make sure it is part of the bundle.");
        }
        // use this to delete file from documents directory
        // [fileManager removeItemAtPath:path error:nil];
    }
    
    // store plist file, at documents directory, in dictionary
    NSDictionary *resultDictionary = [NSDictionary dictionaryWithContentsOfFile:path];
    NSLog(@"Loaded GameData.plist file at Documents Directory is --> %@", [resultDictionary description]);
    
//    NSDictionary *myDict = [NSDictionary dictionaryWithContentsOfFile:path];
    if (resultDictionary) {
        // load items from plist file
        self.bedroomFloorID = [[resultDictionary objectForKey:BedroomFloorKey] integerValue];
        self.bedroomWallID = [[resultDictionary objectForKey:BedbroomWallkey] integerValue];
    } else {
        NSLog(@"WARNING: Couldn't create dictionary from GameData.plist at Documents Dicretory! Default values will be used!");
    }
    
}

- (void)saveGameData {
    
    // getting path to GameDAta.plist
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths firstObject];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"GameData.plist"];
    
    NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithObject:@"XInitializerItem" forKey:@"DoNotEverChangeMe"];
    // saving values
    [dict setObject:[NSNumber numberWithInteger:self.bedroomFloorID] forKey:BedroomFloorKey];
    [dict setObject:[NSNumber numberWithInteger:self.bedroomWallID] forKey:BedbroomWallkey];
    // writing to GameData.plist
    [dict writeToFile:path atomically:YES];
    
    NSDictionary *resultDictionary = [NSDictionary dictionaryWithContentsOfFile:path];
    NSLog(@"Saved GameData.plist file in Documents Direcotry is --> %@", [resultDictionary description]);
    
}

- (IBAction)SaveButtonTapped:(id)sender {
    
    //change bedroomFloorID variable value
    self.bedroomFloorID = 999;
    //save the plist with the changes
    [self saveGameData];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end