A model object with a BOOL property backed by an NSNumber in the implementation

gistfile1.m

// An example of a model object with a boolean property
// that's backed by an NSNumber from a JSON response

@interface ModelObject : NSObject

@property (nonatomic, assign, getter = isEnabled) BOOL enabled;

@end

@interface ModelObject ()

@property (nonatomic, strong) NSNumber *enabledNumber;

@end

@implementation ModelObject

- (id)init;
{
    self = [super init];
	if (self) {
		// assuming a decoded JSON object…
		_enabledNumber = [json valueForKey:@"enabled"]; // returns an NSNumber instance
	}
	return self;
}

#pragma mark - Dynamic properties

- (BOOL)isEnabled;
{
	return self.enabledNumber.boolValue;
}

- (void)setEnabled:(BOOL)enabled;
{
	self.enabledNumber = [NSNumber numberWithBool:enabled];
}

@end