> IOS开发在线手册 > iOS开发-简单抽奖

路过商场,看过抽奖感觉挺有意思的,商场进行抽奖活动,三个奖项,一等奖的概率1/10,二等奖的概率的3/10,三等奖的概率是6/10,具体奖品我没仔细看,回来随便练手了一下,思考了一下,奖品分为10份,生成一个随机数,如果0-5则是三等奖,6-8是二等奖,9是一等奖,简单实现如下:

  int  ranDOMNumber=arc4random()%10;
    if (randomNumber>=0&&randomNumber<=5) {
        [self alert:@"恭喜你获得三等奖手机充值卡999元"];
    }else if(randomNumber>=6&&randomNumber<=8){
        [self alert:@"恭喜你获得二等奖iPad3"];
    }else{
        [self alert:@"恭喜你获得一等奖iPhone6"];
    }

  简单提示:

-(void)alert:(NSString *)message{
//    Http://www.cnblogs.com/xiaofeixiang
    UIAlertView *alterView=[[UIAlertView alloc]initWithTitle:@"抽奖结果" message:message delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];
    [alterView show];
}

效果如下:

iOS开发-简单抽奖