1. int value = arc4random() % x;
2. #define ARC4RANDOM_MAX 0x100000000
3. double val = floorf(((double)arc4random() / ARC4RANDOM_MAX) * 100.0f);    

文章名称：IOS取随机数
文章URL：http://www.jxjierui.cn/article/gdsjed.html