个人博客: http://blog.sina.com.cn/fengyingjie888
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这里就以我们项目的特价商品为例吧! 先来写加的情况,看看需要什么数据 就储存什么数据
//这里是为取数据作准备 selectedArr是存储数据的数组
SpecialPriceModel *mod = dataFourArr[btn.tag];
if (selectedArr.count > 0)
{
//isHave 是为了确定数组里面到底有没有该商品
__block int isHave = 0;
[selectedArr enumerateObjectsUsingBlock:id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop {
//这是数组里面如果有就把数量num + 1 再存进去
if ([obj[@"productid"] isEqualToString:mod.productid])
{
NSMutableDictionary *dataDic = [NSMutableDictionary dictionary];
int num = [obj[@"num"] intValue] + 1;
[dataDic setObject:[NSString stringWithFormat:@"%ld",btn.tag] forKey:@"idex"];
[dataDic setObject:mod.marketprice forKey:@"marketprice"];
[dataDic setObject:mod.productid forKey:@"productid"];
[dataDic setObject:mod.productname forKey:@"productname"];
[dataDic setObject:[NSString stringWithFormat:@"%d",num] forKey:@"num"];
[selectedArr removeObject:obj];
[selectedArr addObject:dataDic];
isHave = 1;
//数组升序排列 为了避免BUG
NSSortDescriptor *sortDes1 = [[NSSortDescriptor alloc] initWithKey:@"idex" ascending:YES];
NSMutableArray *sortDescriptors = [[NSMutableArray alloc] initWithObjects:&sortDes1 count:1];
[selectedArr sortUsingDescriptors:sortDescriptors];
}
}];```
isHave == 0 说明数组中还没有添加该商品 把需要的参数传进去 num置为1就好了
if (isHave == 0)
{
NSMutableDictionary *dataDic = [NSMutableDictionary dictionary];
[dataDic setObject:[NSString stringWithFormat:@"%ld",btn.tag] forKey:@"idex"];
[dataDic setObject:mod.marketprice forKey:@"marketprice"];
[dataDic setObject:mod.productid forKey:@"productid"];
[dataDic setObject:mod.productname forKey:@"productname"];
[dataDic setObject:@"1" forKey:@"num"];
[selectedArr addObject:dataDic];
//数组升序排列
NSSortDescriptor *sortDes1 = [[NSSortDescriptor alloc] initWithKey:@"idex" ascending:YES];
NSMutableArray *sortDescriptors = [[NSMutableArray alloc] initWithObjects:&sortDes1 count:1];
[selectedArr sortUsingDescriptors:sortDescriptors];
}
}
这是一个商品还没选得时候,我把它单独列为一个情况
if (selectedArr.count == 0)
{
NSMutableDictionary *dataDic = [NSMutableDictionary dictionary];
[dataDic setObject:[NSString stringWithFormat:@"%ld",btn.tag] forKey:@"idex"];
[dataDic setObject:mod.marketprice forKey:@"marketprice"];
[dataDic setObject:mod.productid forKey:@"productid"];
[dataDic setObject:mod.productname forKey:@"productname"];
[dataDic setObject:@"1" forKey:@"num"];
[selectedArr addObject:dataDic]; }
下面是减数量的情况 (就是点减号的时间)
SpecialPriceModel *mod = dataFourArr[btn.tag];
[selectedArr enumerateObjectsUsingBlock:id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop
{
//找到该商品 然后判断他得num 如果大于1 就 -1 再存进去 如果=1 说明 num要-为0 所以直接删除就好了
if ([obj[@"productid"] isEqualToString:mod.productid])
{
if ([obj[@"num"] intValue] > 1)
{
NSMutableDictionary *dataDic = [NSMutableDictionary dictionary];
int num = [obj[@"num"] intValue] - 1;
[dataDic setObject:[NSString stringWithFormat:@"%ld",btn.tag] forKey:@"idex"];
[dataDic setObject:mod.marketprice forKey:@"marketprice"];
[dataDic setObject:mod.productid forKey:@"productid"];
[dataDic setObject:mod.productname forKey:@"productname"];
[dataDic setObject:[NSString stringWithFormat:@"%d",num] forKey:@"num"];
[selectedArr removeObject:obj];
[selectedArr addObject:dataDic];
//数组升序排列
NSSortDescriptor *sortDes1 = [[NSSortDescriptor alloc] initWithKey:@"idex" ascending:YES];
NSMutableArray *sortDescriptors = [[NSMutableArray alloc] initWithObjects:&sortDes1 count:1];
[selectedArr sortUsingDescriptors:sortDescriptors];
}
if ([obj[@"num"] intValue] == 1)
{
[selectedArr removeObject:obj];
}
}
}];
下面来说 在表中得操作
SpecialPriceModel *mod = dataFourArr[indexPath.row];
isHave是来确定购物车中是否有该商品 如果有 就把 减号和数量显示出来
__block int isHave = 0;
[selectedArr enumerateObjectsUsingBlock:id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop {
if ([obj[@"productid"] isEqualToString:mod.productid])
{
[cell.jianBtn setHidden:NO];
[cell.payNumLab setHidden:NO];
cell.payNumLab.text = obj[@"num"];
isHave = 1;
}
}];
如果没有就直接隐藏掉
if (isHave == 0)
{
[cell.jianBtn setHidden:YES]; [cell.payNumLab setHidden:YES];
}