How to convert and compare NSNumber to BOOL?

Question

First I convert BOOL value to NSNumber in order to put it into NSUserDefaults. Later I would like to retrieve the BOOL value from the NSUserDefaults, but obviously I get NSN

Answer 1

NSUserDefaults has two methods to transparently operate with booleans:

- (BOOL)boolForKey:(NSString *)defaultName

- (void)setBool:(BOOL)value forKey:(NSString *)defaultName