random.m

gistfile1.m

#import <stdlib.h>

+ (NSNumber *)randomFourDigitNumber
{
    int randomNumber = rand()%9999 + 1000;
    

    NSArray *badNumbers = [NSArray arrayWithObjects:@"69",@"666",@"0",@"11",@"22",@"33",@"44",@"55",@"66",@"77",@"88",@"99", nil];
    
    for (NSString *badNumber in badNumbers) {
        if ([[NSString stringWithFormat:@"%i",randomNumber] rangeOfString:badNumber].location != NSNotFound) {
            randomNumber = [[self randomFourDigitNumber] intValue];
        }
    }
    
    return [NSNumber numberWithInt:randomNumber];
}