微信發(fā)紅包，也就是把一個數(shù)隨機分成n份，n份數(shù)額的的值等于總數(shù)額。
依據(jù)以上規(guī)則。實現(xiàn)如下
1.有最小值 其它隨機分配
代碼實現(xiàn)如下：

- (NSMutableArray *)getRedFromJavaWithTotalMoney:(CGFloat)total redNumber:(NSInteger)number minMoney:(CGFloat)min
{

 if(total/number<min)
    {
        NSLog(@"最小值不合法");
        
        return nil;
    }

    float money;
    double max;
    int i=1;
    
    NSMutableArray *math = [NSMutableArray array];
    while(i<number)
    {
        
        max = total- min*(number- i);
        NSInteger k = (int)((number-i)/2);
        if (number -i <= 2)
        {
            k = number -i;
            
        }
        max = max/k;
        double val = ((double)arc4random() / 0x100000000);
       if (max<min)
         {
            NSLog(@"max小于min");
            max = min+1;
         }
        money=(int)(min*100+val*(max*100-min*100+1));
        money=(float)money/100;
        total=total-money;
        ;
        [math addObject:[NSString stringWithFormat:@"%f",money]];
//        NSLog(@"第%d人 拿到%f",i,money);
        i++;
        if(i==number)
        {
            [math addObject:[NSString stringWithFormat:@"%f",total]];
//            NSLog(@"最后 第%d人 拿到%f",i,money);
        }
    }
    

    return math;
    
}

2.有最小值和最大值
代碼實現(xiàn)如下

- (NSMutableArray *)getRedFromJavaWithTotalMoney:(CGFloat)total redNumber:(NSInteger)number minMoney:(CGFloat)min maxMoney:(CGFloat)maxMoney
{
    if (total/number>maxMoney)
    {
        NSLog(@"最大值不合法");
        
        return nil;
    }
    if(total/number<min)
    {
        NSLog(@"最小值不合法");
        
        return nil;
    }
    
    float money;
    double max;
    int i=1;
    
    NSMutableArray *math = [NSMutableArray array];
    while(i<number)
    {
        
        max = total- min*(number- i);
        CGFloat canMaxMoney = maxMoney>max?max:maxMoney;
        NSInteger k = (int)((number-i)/2);
        if (number -i <= 2)
        {
            k = number -i;

        }
        max = max/k;
        
        double val = ((double)arc4random() / 0x100000000);
        if (max<min)
        {
            NSLog(@"max小于min");
            max = min+1;
        }
        money=(int)(min*100+val*(canMaxMoney*100-min*100+1));
        money=(float)money/100;
        total=total-money;
        [math addObject:[NSString stringWithFormat:@"%f",money]];
        //        NSLog(@"第%d人 拿到%f",i,money);
        i++;
        if(i==number)
        {
            [math addObject:[NSString stringWithFormat:@"%f",total]];
            //            NSLog(@"最后 第%d人 拿到%f",i,money);
        }
    }
    
    return math;
    
}

好好學(xué)習(xí) 天天向上
不足之處 歡迎指出