NSUserDefaults macros

gistfile1.m

#define jn_defaults_get_object(key) [[NSUserDefaults standardUserDefaults] objectForKey:key]
#define jn_defaults_set_object(key, object) \
[[NSUserDefaults standardUserDefaults] setObject:object forKey:key]; \
[[NSUserDefaults standardUserDefaults] synchronize]; \
jn_defaults_post_notification(key)

#define jn_defaults_get_float(key) [jn_defaults_get_object(key) floatValue]
#define jn_defaults_set_float(key, float) jn_defaults_set_object(key, [NSNumber numberWithFloat:float])

#define jn_defaults_observe(key, block) \
    [[NSNotificationCenter defaultCenter] addObserverForName:[NSString stringWithFormat:@"default_changed_%@", key] object:nil queue:[NSOperationQueue mainQueue] usingBlock:block]
#define jn_defaults_object_from_notification(notificationObject) \
    [notificationObject.userInfo objectForKey:@"value"]

#define jn_defaults_get_bool(key) [jn_defaults_get_object(key) boolValue]
#define jn_defaults_set_bool(key, boolean) jn_defaults_set_object(key, [NSNumber numberWithBool:boolean])

#define jn_defaults_post_notification(defaults_key) \
    [[NSNotificationCenter defaultCenter] postNotificationName:[NSString stringWithFormat:@"default_changed_%@", defaults_key] object:nil userInfo:[NSDictionary dictionaryWithObject:jn_defaults_get_object(defaults_key) forKey:@"value"]]

Write less code when saving something to the NSUserDefaults

Save values to the user defaults

jn_defaults_set_object(@"user/email", @"alice@github.com");
jn_defaults_set_bool(@"user/logged-in", YES);

Read values

NSString *email = jn_defaults_get_object(@"user/email");
BOOL isUserLoggedIn = jn_defaults_get_bool(@"user/logged-in");

Observe values

jn_defaults_observe(@"user/email", ^(NSNotification *notification) {
    NSString *email = jn_defaults_object_from_notification(notification);
});