ios 生成字母加数字的随机数

文章来自：http://blog.csdn.net/baidu_25743639/article/details/73801700

近期项目第三方登录之后默认创建账号和密码,就用随机数生产,这里只需要传入你需要几位的随机数即可,例如你需要得到8位的随机数,num就传入8

好了,废话少说,简单Demo如下:

- (NSString *)getRandomStringWithNum:(NSInteger)num
{
    NSString *string = [[NSString alloc]init];
    for (int i = 0; i < num; i++) {
        int number = arc4random() % 36;
        if (number < 10) {
            int figure = arc4random() % 10;
            NSString *tempString = [NSString stringWithFormat:@"%d", figure];
            string = [string stringByAppendingString:tempString];
        }else {
            int figure = (arc4random() % 26) + 97;
            char character = figure;
            NSString *tempString = [NSString stringWithFormat:@"%c", character];
            string = [string stringByAppendingString:tempString];
        }
    }
    return string;
}