iOS 購物車功能的實現

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首先分為三種情況,分別是1.點擊單個商品 2.點擊商店選中該商店的所有商品 3.全選

分別創建按鈕? 單個商品的按鈕的tag值為indexPath.row 商店按鈕為 btn.tag = section + 10000; 全選為btn.tag = -10;好了這是我得設定 三個按鈕方法為一個

//先確定購物車有商品

if (shopArr.count == 0)


{

[selfshowAlertWithPoint:2

                    text:@"你的購物車還沒有商品哦!快去添加吧"

                   color:UICYAN];

return;

}

ShoppingCarModel *mod = shopArr[indexPath.section];



carOrderListModel *lMod = mod.orderList[indexPath.row];///為了一會方便取數據

NSNumber *number =[NSNumbernumberWithInteger:indexPath.section];


NSNumber *number1 =[NSNumbernumberWithInteger:indexPath.row];

?//先確定當前點擊按鈕有沒有被選中

__blockBOOL isSelected =NO;


__blockBOOL sectionIsSelected =NO;

//數組升序排列為了解決先存下面的再存上面的 導致根據索引取值的時候會出錯(必須多點一次商店的按鈕) 雖然不是大BUG 但是為了追求完美就重新排列下數組


NSSortDescriptor *sortDes1 = [[NSSortDescriptor alloc] initWithKey:@"a"ascending:YES];

NSMutableArray *sortDescriptors = [[NSMutableArray alloc] initWithObjects:&sortDes1 count:1];

 [_selectedArr sortUsingDescriptors:sortDescriptors];

[_selectedArrenumerateObjectsUsingBlock:id _Nonnull obj, NSUInteger idx1, BOOL * _Nonnull stop


 {

//單行和商店按鈕 全選會是另一個值來判斷?


 if ([obj[@"a"] isEqualToString:[NSStringstringWithFormat:@"%@",number]])

 {



     NSArray *arr = obj[@"row"];

     [arr enumerateObjectsUsingBlock:^(id  _Nonnull obj1, NSUInteger idx, BOOL * _Nonnull stop) {

         if ([obj1[@"b"] isEqualToString:[NSStringstringWithFormat:@"%@",number1]])

         {

             //進到此處表示這一行剛才操作過

             isSelected = YES;/// Variable is not assignable (missing __block type specifier)

         }

         }];

 }

 if ([obj[@"a"] isEqualToString:[NSStringstringWithFormat:@"%ld",button.tag - 10000]])

 {

     //這個區被選過

     sectionIsSelected = YES;

 }

 }];

//當點擊商店按鈕的時候

if (button.tag > 9999)


{



//1.找單元格

if (sectionIsSelected)

{

    [_selectedArrenumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop)

     {

         if ([obj[@"a"] isEqualToString:[NSStringstringWithFormat:@"%ld",button.tag - 10000]]) {

             //刪掉

             [_selectedArrremoveObject:obj];

             if (button.tag != - 10)

             {

                 All = NO;



             }

             [button setImage:[UIImageimageNamed:@"nosele"] forState:UIControlStateNormal];

         }



     }];



}

if (!sectionIsSelected)

{

    NSMutableDictionary *sectionDic = [NSMutableDictionarydictionary];

    NSMutableArray *rowArr = [NSMutableArrayarray];



    ShoppingCarModel *mod4 = shopArr[button.tag - 10000];

    [_selectedArrenumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop)

    {

        if ([obj[@"a"] isEqualToString:[NSStringstringWithFormat:@"%ld",button.tag - 10000]])

        {

            [_selectedArrremoveObject:obj];

        }

    }];



    for (int b = 0; b < mod4.orderList.count; b ++)

    {

        NSMutableDictionary *rowDic = [NSMutableDictionarydictionary];

        carOrderListModel *mod5 = mod4.orderList[b];

        NSString *price = [NSStringstringWithFormat:@"%f",[mod5.marketPricefloatValue] * [mod5.numfloatValue]];

        [rowDic setObject:[NSStringstringWithFormat:@"%d",b] forKey:@"b"];

        [rowDic setObject:price forKey:@"c"];

        [rowDic setObject:mod5.cartIdforKey:@"d"];

        [rowArr addObject:rowDic];



    }

    [sectionDic setObject:[NSStringstringWithFormat:@"%ld",(long)button.tag - 10000] forKey:@"a"];

    [sectionDic setObject:rowArr forKey:@"row"];



    [_selectedArraddObject:sectionDic];

    //記錄當前單元格的索引

    [button setImage:[UIImageimageNamed:@"sele"] forState:UIControlStateNormal];

// NSLog(@"數組%@",_selectedArr);


}

[tablereloadData];

}

?

//當點擊某個商品按鈕的時候

if (button.tag > -1 && button.tag < 9999)


{

//1.找單元格

if (isSelected)

{

    NSNumber *number =[NSNumbernumberWithInteger:indexPath.section];

    NSNumber *number1 =[NSNumbernumberWithInteger:indexPath.row];



    [_selectedArrenumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx1, BOOL * _Nonnull stop)

     {

         if ([obj[@"a"] isEqualToString:[NSStringstringWithFormat:@"%@",number]])

         {

             NSMutableArray *arr = obj[@"row"];

             [arr enumerateObjectsUsingBlock:^(id  _Nonnull obj1, NSUInteger idx, BOOL * _Nonnull stop) {

                 if ([obj1[@"b"] isEqualToString:[NSStringstringWithFormat:@"%@",number1]])

                 {



                     //刪掉

                     [arr removeObject:obj1];

                     if (button.tag != - 10)

                     {

                         All = NO;



                     }





                 }

             }];

         }

     }];





    [button setImage:[UIImageimageNamed:@"nosele"] forState:UIControlStateNormal];

    [seleBtnsetImage:[UIImageimageNamed:@"nosele"] forState:UIControlStateNormal];



}

if (!isSelected)

{

    if (button.tag != -10)

    {

        NSString *num = [NSStringstringWithFormat:@"%f",[lMod.marketPricefloatValue] * [lMod.numfloatValue]];

        NSNumber *number =[NSNumbernumberWithInteger:indexPath.section];

        NSNumber *numberRow =[NSNumbernumberWithInteger:indexPath.row];



        NSMutableArray *rowArr = [NSMutableArrayarray];



        NSMutableDictionary *sectionDic = [NSMutableDictionarydictionary];

        NSMutableDictionary *rowDic = [NSMutableDictionarydictionary];



        [sectionDic setObject:[NSStringstringWithFormat:@"%@",number] forKey:@"a"];

        [rowDic setObject:[NSStringstringWithFormat:@"%@",numberRow] forKey:@"b"];

        [rowDic setObject:num forKey:@"c"];

        [rowDic setObject:lMod.cartIdforKey:@"d"];

        [rowArr addObject:rowDic];

        [sectionDic setObject:rowArr forKey:@"row"];



        //            NSLog(@"字典%@",sectionDic);



        [_selectedArraddObject:sectionDic];

        //數組字典之類的存的都是對象數據類型 >>>如果遇到整數類型的可以考慮轉換成NSNumber

        //記錄當前單元格的索引

        [button setImage:[UIImageimageNamed:@"sele"] forState:UIControlStateNormal];

    }



}

}

//當點擊全選按鈕的時候?

? if (button.tag == -10)

{

//遍歷記錄索引的數組  如果數組里面的索引和當前點擊單元格的indexPath相等

//1.找單元格

if (All)

{

    //刪掉

    [_selectedArrremoveAllObjects];

    [button setImage:[UIImageimageNamed:@"nosele"] forState:UIControlStateNormal];

    All = NO;

}

else

{

    All = YES;



    [_selectedArrremoveAllObjects];

    for (int a = 0; a <</span> shopArr.count; a ++)

    {



        NSMutableDictionary *sectionDic = [NSMutableDictionarydictionary];

        NSMutableArray *rowArr = [NSMutableArrayarray];

        ShoppingCarModel *mod4 = shopArr[a];



        for (int b = 0; b < mod4.orderList.count; b ++)

        {

            NSMutableDictionary *rowDic = [NSMutableDictionarydictionary];

            carOrderListModel *mod5 = mod4.orderList[b];

            NSString *price = [NSStringstringWithFormat:@"%f",[mod5.marketPricefloatValue] * [mod5.numfloatValue]];

            [rowDic setObject:[NSStringstringWithFormat:@"%d",b] forKey:@"b"];

            [rowDic setObject:price forKey:@"c"];

            [rowDic setObject:mod5.cartIdforKey:@"d"];

            [rowArr addObject:rowDic];

        }

        [sectionDic setObject:[NSStringstringWithFormat:@"%d",a] forKey:@"a"];

        [sectionDic setObject:rowArr forKey:@"row"];



        [_selectedArraddObject:sectionDic];

    }

    //記錄當前單元格的索引

    [button setImage:[UIImageimageNamed:@"sele"] forState:UIControlStateNormal];

// NSLog(@"數組%@",_selectedArr);


}

[tablereloadData];

}

?///執行完上面以后就可以結算價格了

priceNum = 0;


count = 0;

NSMutableString *str = [NSMutableStringstring];

[_selectedArrenumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx1, BOOL * _Nonnull stop)

 {

 NSArray *arr = obj[@"row"];

 [arr enumerateObjectsUsingBlock:^(id  _Nonnull obj1, NSUInteger idx, BOOL * _Nonnull stop) {

     //進到此處表示剛才操作過

     priceNum = [obj1[@"c"] floatValue] + priceNum;

     count ++;

     [str insertString:[NSStringstringWithFormat:@"%@,",obj1[@"d"]] atIndex:0];

 }];

 }];

oneCardId = [NSStringstringWithFormat:@"%@",str];

// NSLog(@"錢數還有多少$%f",priceNum);

//因為我們的購物車是兩種貨幣 所以要判斷狀態?

if ([typeisEqualToString:@"1"])

{

labPrice.text = [NSStringstringWithFormat:@"你將支付:%.2f元",priceNum];

}

else

{

labPrice.text = [NSStringstringWithFormat:@"你將支付:%.2f龍點幣",priceNum];

}

[payBtnsetTitle:[NSStringstringWithFormat:@"結算(%lu)",(unsignedlong)count] forState:UIControlStateNormal];
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