MKiCloudSync.m

//
//  MKiCloudSync.m
//  iCloud1
//
//  Created by Mugunth Kumar (@mugunthkumar) on 20/11/11.
//  Copyright (C) 2011-2020 by Steinlogic

//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.

//  As a side note, you might also consider 
//	1) tweeting about this mentioning @mugunthkumar
//	2) A paypal donation to mugunth.kumar@gmail.com


#import "MKiCloudSync.h"

@implementation MKiCloudSync

+(void) updateToiCloud:(NSNotification*) notificationObject {
    
    NSDictionary *dict = [[NSUserDefaults standardUserDefaults] dictionaryRepresentation];
    
    [dict enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
        
        [[NSUbiquitousKeyValueStore defaultStore] setObject:obj forKey:key];
    }];
    
    [[NSUbiquitousKeyValueStore defaultStore] synchronize];
}

+(void) updateFromiCloud:(NSNotification*) notificationObject {
    
    NSUbiquitousKeyValueStore *iCloudStore = [NSUbiquitousKeyValueStore defaultStore];
    NSDictionary *dict = [iCloudStore dictionaryRepresentation];
    
    // prevent NSUserDefaultsDidChangeNotification from being posted while we update from iCloud
    
    [[NSNotificationCenter defaultCenter] removeObserver:self 
                                                    name:NSUserDefaultsDidChangeNotification 
                                                  object:nil];

    [dict enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
        
        [[NSUserDefaults standardUserDefaults] setObject:obj forKey:key];
    }];

    [[NSUserDefaults standardUserDefaults] synchronize];

    // enable NSUserDefaultsDidChangeNotification notifications again

    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(updateToiCloud:) 
                                                 name:NSUserDefaultsDidChangeNotification                                                    
												object:nil];
    
    [[NSNotificationCenter defaultCenter] postNotificationName:kMKiCloudSyncNotification object:nil];
}

+(void) start {
    
    if(NSClassFromString(@"NSUbiquitousKeyValueStore")) { // is iOS 5?
        
        if([NSUbiquitousKeyValueStore defaultStore]) {  // is iCloud enabled
            
            [[NSNotificationCenter defaultCenter] addObserver:self 
                                                     selector:@selector(updateFromiCloud:) 
                                                         name:NSUbiquitousKeyValueStoreDidChangeExternallyNotification 
                                                       object:nil];
            
            [[NSNotificationCenter defaultCenter] addObserver:self 
                                                     selector:@selector(updateToiCloud:) 
                                                         name:NSUserDefaultsDidChangeNotification                                                    object:nil];
        } else {
            DLog(@"iCloud not enabled");          
        }
    }
    else {
        DLog(@"Not an iOS 5 device");        
    }
}

+ (void) dealloc {
    
    [[NSNotificationCenter defaultCenter] removeObserver:self 
                                                    name:NSUbiquitousKeyValueStoreDidChangeExternallyNotification 
                                                  object:nil];

    [[NSNotificationCenter defaultCenter] removeObserver:self 
                                                    name:NSUserDefaultsDidChangeNotification 
                                                  object:nil];
}
@end