NSCharacterSet example

test.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [self printCharacterSet:@selector(URLFragmentAllowedCharacterSet)];
    [self printCharacterSet:@selector(URLPasswordAllowedCharacterSet)];
    [self printCharacterSet:@selector(URLPathAllowedCharacterSet)];
    [self printCharacterSet:@selector(URLQueryAllowedCharacterSet)];
    [self printCharacterSet:@selector(URLUserAllowedCharacterSet)];

    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)printCharacterSet:(SEL)character
{
    NSCharacterSet *characterSet = [NSCharacterSet performSelector:character];
    NSMutableArray *mutableCharacters = [NSMutableArray array];
    for (NSUInteger plane = 0; plane <= 16; plane++) {
        if ([characterSet hasMemberInPlane:plane]) {
            for (UTF32Char character = (UTF32Char)(plane << 16);
                 character < (plane + 1) << 16; character++)
            {
                if ([characterSet longCharacterIsMember:character]) {
                    UTF32Char c = OSSwapHostToLittleInt32(character);
                    NSString *characterString = [[NSString alloc] initWithBytes:&c
                                                                         length:sizeof(UTF32Char)
                                                                       encoding:NSUTF32LittleEndianStringEncoding];
                    [mutableCharacters addObject:characterString];
                }
            }
        }
    }
    printf("%s: ", [NSStringFromSelector(character) UTF8String]);
    for(NSString *s in mutableCharacters) {
        printf("%s", [s UTF8String]);
    }
    printf("\n");
//    NSLog(@"%@: %@", NSStringFromSelector(character), [mutableCharacters componentsJoinedByString:@","]);
}

@end