Displaying BOOL as String

[cnewbs]

I've been following along the More iPhone Development book, and in the section on Core Data they make use of a protocol which dictates how to display different data types as NSString.

@protocol SettingsValueDisplay
- (NSString *)settingsValueDisplay;
@end

@interface NSString (SettingsValueDisplay) <SettingsValueDisplay>
- (NSString *)settingsValueDisplay;
@end

@interface NSDate (SettingsValueDisplay) <SettingsValueDisplay>
- (NSString *)settingsValueDisplay;
@end

//and so on....

@implementation NSString (SettingsValueDisplay)
- (NSString *)settingsValueDisplay {
	return self;
}

@end

#pragma mark -
#pragma mark NSDate SettingsValueDisplay
@implementation NSDate (SettingsValueDisplay)
- (NSString *)settingsValueDisplay {
	NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
	[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
	
	NSString *returnVal = [dateFormatter stringFromDate:self];
	[dateFormatter release];
	
	return returnVal;
}

//and so on...
@end

I'm attempting to modify this code to suit more of my own needs but I've run into a problem with BOOL. Is it possible to create something similar for BOOLs, or will I treat those as exceptions when I use

[self.managedObject valueForKey:@"key"] settingsValueDisplay];

in my table views.

Any help is greatly appreciated.

[TheDoty]

In your .h:

@interface BOOL (SettingsValueDisplay) <SettingsValueDisplay>
- (NSString *)settingsValueDisplay;
@end

And in your .m:

@implementation BOOL (SettingsValueDisplay)
- (NSString *)settingsValueDisplay {
	if(self) {
             return @"TRUE";
        } else {
             return @"FALSE";
        }
}

@end