objective-c : 아이클라우드 설정 여부 체크 : didFinishLaunchingWithOptions 메소드

snippet.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    
    NSUbiquitousKeyValueStore *kvoStore =
    [NSUbiquitousKeyValueStore defaultStore];
    
    NSString *stringValue = @"My String";
    NSString *stringValueKey = @"MyStringKey";
    
    BOOL boolValue = YES;
    NSString *boolValueKey = @"MyBoolKey";
    
    BOOL mustSynchronize = NO;
    
    if ([[kvoStore stringForKey:stringValueKey] length] == 0){
        NSLog(@"Could not find the string value in iCloud. Setting...");
        [kvoStore setString:stringValue
                     forKey:stringValueKey];
        mustSynchronize = YES;
    } else {
        NSLog(@"Found the string in iCloud, getting...");
        stringValue = [kvoStore stringForKey:stringValueKey];
    }
    
    if ([kvoStore boolForKey:boolValueKey] == NO){
        NSLog(@"Could not find the boolean value in iCloud. Setting...");
        [kvoStore setBool:boolValue
                   forKey:boolValueKey];
        mustSynchronize = YES;
    } else {
        NSLog(@"Found the boolean in iCloud, getting...");
        boolValue = [kvoStore boolForKey:boolValueKey];
    }
    
    if (mustSynchronize){
        if ([kvoStore synchronize]){
            NSLog(@"Successfully synchronized with iCloud.");
        } else {
            NSLog(@"Failed to synchronize with iCloud.");
        }
    }
    
    self.window = [[UIWindow alloc]
                   initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    
    return YES;

}