Objective c 从web服务器检查Api版本以更新核心数据

提前感谢您的帮助，如果我用objective-c语言写一些奇怪的东西，请谅解。 我从web服务获取json，并尝试存储所有核心数据，以便在网络状态关闭的情况下，我可以在保存数据的情况下运行应用程序

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.managedObjectContext =  [self managedObjectContextWithName:@"CoreData"];


    NSMutableArray * competition = [self.jsonCompetition objectForKey:@"Competition"];
    NSMutableDictionary * competizione = [[NSMutableDictionary alloc] init];

    for (int i = 0; i< competition.count; i++) {
        NSManagedObject * competion = [NSEntityDescription
                                       insertNewObjectForEntityForName:@"Competition"
                                       inManagedObjectContext:self.managedObjectContext];

        competizione = [competition objectAtIndex:i];
        [competion setValue:[competizione objectForKey:@"id"] forKeyPath:@"id"];
        [competion setValue:[competizione objectForKey:@"name"] forKeyPath:@"name"];
        [competion setValue:[competizione objectForKey:@"region"] forKeyPath:@"region"];
        NSError *error;

        if (![self.managedObjectContext save:&error]) {

            NSLog(@"Errore: %@", [error localizedDescription]);
        }


    }

    NSError *errore;

    if (!errore) {
        // NSLog(@"%@",_jsonDict);

    } else {

        NSLog(@"ERROR!");
    }
    [self.managedObjectContext save:&errore];

    Reachability *reachability = [Reachability reachabilityForInternetConnection];
    NetworkStatus networkStatus = [reachability currentReachabilityStatus];
    if (networkStatus == ReachableViaWWAN) {



    } else if (networkStatus == ReachableViaWiFi) {

        NSData *data = [self callWS];
        NSError *errore;

        self.jsonCompetition = [NSJSONSerialization JSONObjectWithData:data                                                              options:kNilOptions
                                                                  error:&errore];

        self.managedObjectContext =  [self managedObjectContextWithName:@"CoreData"];


        NSMutableArray * competition = [self.jsonCompetition objectForKey:@"Competition"];
        NSMutableDictionary * competizione = [[NSMutableDictionary alloc] init];

        for (int i = 0; i< competition.count; i++) {
            NSManagedObject * competion = [NSEntityDescription
                                           insertNewObjectForEntityForName:@"Competition"
                                           inManagedObjectContext:self.managedObjectContext];

            competizione = [competition objectAtIndex:i];
            [competion setValue:[competizione objectForKey:@"id"] forKeyPath:@"id"];
            [competion setValue:[competizione objectForKey:@"name"] forKeyPath:@"name"];
            [competion setValue:[competizione objectForKey:@"region"] forKeyPath:@"region"];


            if (![self.managedObjectContext save:&errore]) {

                NSLog(@"Errore: %@", [errore localizedDescription]);
            }


        }

        [self.managedObjectContext save:&errore];
        if (!error) {
            // NSLog(@"%@",_jsonDict);
        } else {
            NSLog(@"ERROR!");
        }

        NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];

        NSEntityDescription *entityCompetizione = [NSEntityDescription
                                       entityForName:@"Competition" inManagedObjectContext:self.managedObjectContext];

        [fetchRequest setEntity:entityCompetizione];
        NSArray *arrayCompetizioni = [self.managedObjectContext executeFetchRequest:fetchRequest error:&errore];


    } else  {



        NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];

        NSEntityDescription *entityCompetizione = [NSEntityDescription
                                                   entityForName:@"Competition" inManagedObjectContext:self.managedObjectContext];

        [fetchRequest setEntity:entityCompetizione];

        NSArray *arrayCompetizioni = [self.managedObjectContext executeFetchRequest:fetchRequest error:&errore];



    }

    FirstViewController * fVC = [[FirstViewController alloc]initWithNibName:@"FirstViewController" bundle:nil];
    self.window.rootViewController = fVC;
    [self.window makeKeyAndVisible];
    return YES;

-（BOOL）应用程序：（UIApplication*）应用程序使用选项完成启动：（NSDictionary*）启动选项
{
self.window=[[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]]；
self.managedObjectContext=[self-managedObjectContextWithName:@“CoreData”]；
NSMutableArray*competition=[self.jsonCompetition objectForKey:@“competition”]；
NSMutableDictionary*competizione=[[NSMutableDictionary alloc]init]；
for（int i=0；i

在json中，我有一个带ApiVersion的密钥，有一种方法可以检查核心数据是否需要在新版本的json中更新（如果网络状态为on）？？

---

谢谢

您将以前的ApiVersion保存到

NSUserDefaults

：

NSNumber *currentApiVersion = ...; //You get the version here from JSON

[[NSUserDefaults standardUserDefaults] setObject:currentApiVersion forKey:@"ApiVersion"];

当新数据到达时，您将与保存的值进行比较：

NSNumber *currentApiVersion = ...; //You get the version here from the JSON

NSNumber *previousApiVersion = [[NSUserDefaults standardUserDefaults] objectForKey:@"ApiVersion"];

if (![currentApiVersion isEqualToNumber:previousApiVersion]) {
    //Update the stored version
    [[NSUserDefaults standardUserDefaults] setObject:currentApiVersion forKey:@"ApiVersion"]; 

    //The Api Version is different.
}

---

代码完成了它的工作：）再次感谢！如果您满意，请接受答案，以便其他人知道您的问题已经解决。我不建议使用NSUserDefaults。您正在混合持久层。此类信息应存储在存储服务器数据的NSPersistentStore的元数据中。This将您的数据保存在一起，而不是将一个数据以一种格式保存，另一个数据以另一种格式保存。我同意应该将它们存储在一起，但您需要一个全新的实体来实现这一点。他指的是