iphone-common-codes-ccteam源代码 CCRandom.m

//
//  CCRandom.m
//  CCFC
//
//  Created by xichen on 11-12-23.
//  Copyright 2011 ccteam. All rights reserved.
//


#import "CCRandom.h"
#import <stdlib.h>
#import <mach/mach_time.h>
#import "CCLog.h"


@implementation CCRandom


// it uses a slightly more compicated argorithm than common random
+ (long)generateRandomNum
{
        static long randomValue = 0;
        srandom((unsigned)mach_absolute_time() + randomValue);
        randomValue = random();
        
        return random();
}


+ (NSString *)generateRandomStringByLen:(int)len
{
        char *str = (char *)malloc(len + 1);
        if(!str)
                return nil;
        
        memset(str, 0, len + 1);
        for(int i = 0; i < len; ++i)
        {
                str[i] = abs([self generateRandomNum] % 10) + '0';
                LOG_CHAR(str[i]);
        }
        
        LOG_CSTR(str);
        NSString *ret = [NSString stringWithUTF8String:str];
        free(str);
        return ret;
}


@end

 

可能有更新:

 googlecode链接地址：http://code.google.com/p/iphone-common-codes-ccteam/source/browse/trunk/CCFC/files/CCRandom.m

 github地址: https://github.com/cxsjabc/iphone-common-codes-ccteam/tree/master/CCFC/files/CCRandom.m