项目需求
简单说一下我的需求:服务端给我传了两组数据，要求实现淘宝选择商品规格的功能。
选择对应商品规格，加入购物车
//这是所有sku的数组，spec_array为每一条sku所包含的所有规格
"sku_list": [{
"id": "5dea1d944a723c535f9a9354",
"modified_date": "2019-12-06 17:21:24",
"corp_code": "C00000",
"modifier_id": "5a7c2050ca2d3c7baf85efd7",
"spec_array": [{
"spec_id": "5d00cf245d48ca10241adca3",
"spec_item_name": "1颗\/约0.6分",
"name": "主石重量",
"spec_item_id": "5d00cf245d48ca10241adca8"
}, {
"spec_id": "5d00cca55d48ca10241adca0",
"spec_item_name": "钻石",
"name": "材质",
"spec_item_id": "5d00cca55d48ca10241adca2"
}, {
"spec_id": "5de620914a723c0d7a971aeb",
"spec_item_name": "A1",
"name": "尺码",
"spec_item_id": "5de620914a723c0d7a971aec"
}],
"last_stock": "15",
"is_active": "Y",
"created_date": "2019-12-06 17:21:24",
"stock": 15,
"market_price": 100,
"price": 88,
"product_id": "5ddf766f4a723c3cb8deffdb",
"creator_id": "5a7c2050ca2d3c7baf85efd7"
},
......
]
//既然sku_list中有所有规格列表了，那么还有一个spec_list就是所有可以选择的规格的数组了, value_list为每一个规格的属性数组
"spec_list": [{
"spec_id": "5de620914a723c0d7a971aeb",
"spec_name": "尺码",
"value_list": [{
"spec_item_id": "5de620914a723c0d7a971aed",
"spec_item_name": "A2"
}, {
"spec_item_id": "5de620914a723c0d7a971aec",
"spec_item_name": "A1"
}, {
"spec_item_id": "5de620914a723c0d7a971aee",
"spec_item_name": "A3"
}]
}, {
"spec_id": "5d00cf245d48ca10241adca3",
"spec_name": "主石重量",
"value_list": [{
"spec_item_id": "5d00cf245d48ca10241adca6",
"spec_item_name": "1颗\/约4.9分"
}, {
"spec_item_id": "5d00cf245d48ca10241adca8",
"spec_item_name": "1颗\/约0.6分"
}]
}, {
"spec_id": "5d00cca55d48ca10241adca0",
"spec_name": "材质",
"value_list": [{
"spec_item_id": "5d00cca55d48ca10241adca2",
"spec_item_name": "钻石"
}, {
"spec_item_id": "5d00cca55d48ca10241adca1",
"spec_item_name": "K金"
}]
}]
大佬OrangeAL的文章iOS-SKU商品规格组合算法详解提供了一种解决思路
数据处理
首先将数据整理成有效数据，将有效sku保存成一个按spec_list的顺序排列的数组_skuData
_skuData = [[NSMutableArray alloc]init];
NSArray *spec_list = _productModel.spec_list;
if (spec_list) {
for (int i = 0; i<_productModel.skuList.count; i++) {
NSMutableDictionary *skuObj = [[NSMutableDictionary alloc]init];
NSDictionary *skuItem = _productModel.skuList[i];
[skuObj setValue:skuItem[@"id"] forKey:@"sku_id"];
NSMutableArray *specItems = [[NSMutableArray alloc]init];
NSDictionary *spec_array = skuItem[@"spec_array"];
for (NSDictionary *item in spec_array) {
[specItems addObject:item[@"spec_item_id"]];
}
NSMutableArray *tempArray = [[NSMutableArray alloc]init];
for (int j = 0; j < spec_list.count; j++) {
NSArray *value_list = spec_list[j][@"value_list"];
[value_list enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
if ([specItems containsObject:obj[@"spec_item_id"]]) {
[tempArray addObject:obj[@"spec_item_id"]];
}
}];
}
NSString *spec_item_id_list = [tempArray componentsJoinedByString:@","];
[skuObj setValue:spec_item_id_list forKey:@"spec_item_id_list"];
[skuObj setValue:skuItem[@"stock"] forKey:@"store"];
[skuObj setValue:skuItem[@"price"] forKey:@"price"];
[_skuData addObject:skuObj];
}
}
_skuData的值为
[{
price = 88;//价格
"sku_id" = 5dea1d944a723c535f9a9354;
"spec_item_id_list" = "5de620914a723c0d7a971aec,5d00cf245d48ca10241adca8,5d00cca55d48ca10241adca2";//当前sku所包含的规格（按spec_list中规格顺序排序，[尺码id,主石重量id,材质id]）
store = 15;//库存
},
{
price = 88;
"sku_id" = 5dea1d944a723c535f9a9355;
"spec_item_id_list" = "5de620914a723c0d7a971aee,5d00cf245d48ca10241adca8,5d00cca55d48ca10241adca2";
store = 15;
},
{
price = 88;
"sku_id" = 5dea1d944a723c535f9a9356;
"spec_item_id_list" = "5de620914a723c0d7a971aed,5d00cf245d48ca10241adca6,5d00cca55d48ca10241adca1";
store = 15;
},
{
price = 88;
"sku_id" = 5dea1d944a723c535f9a9357;
"spec_item_id_list" = "5de620914a723c0d7a971aee,5d00cf245d48ca10241adca6,5d00cca55d48ca10241adca1";
store = 15;
}]
自定义collectionView
#import <UIKit/UIKit.h>
NS_ASSUME_NONNULL_BEGIN
@class ItemView;
/// 视图的协议
@protocol ItemViewDelegate <NSObject>
@optional
-(void)didSelected:(ItemView *)itemView;
@end
/// 格子
@interface ItemView : UIView
/// 按钮事件代理
@property (nonatomic, weak) id<ItemViewDelegate> delegate;
/// 是否是多行
@property (nonatomic, assign) BOOL isMultiLines;
/// 位置
@property (nonatomic, strong) NSIndexPath *indexPath;
/// 设置选中状态
@property (nonatomic, assign) BOOL itemSelected;
/// 设置不可选
@property (nonatomic, assign) BOOL itemDisable;
/// 设置 文本框的文字 文字的最小宽度 最大宽度 文字的字体
- (void)setText:(NSString *)text minWith:(CGFloat)minWith maxWith:(CGFloat)maxWith font:(UIFont *)font;
@end
NS_ASSUME_NONNULL_END
#import "ItemView.h"
@interface ItemView ()
/// 文本框
@property (nonatomic, strong) UILabel *label;
/// 装载内容
@property (nonatomic, strong) UIView *contentView;
/// 最小宽度
@property (nonatomic, assign) CGFloat minWidth;
/// 选中的标题颜色 边框色
@property (nonatomic, strong) UIColor *selectedTitleColro;
/// 选中背景色
@property (nonatomic, strong) UIColor *selectedBgColor;
/// 未选中背景色
@property (nonatomic, strong) UIColor *unSelectedBgColor;
/// 未选中的标题颜色
@property (nonatomic, strong) UIColor *unSelectedTitleColor;
/// 不可点击的标题颜色
@property (nonatomic, strong) UIColor *disableTitleColor;
/// 点击事件(手势)
@property (nonatomic, strong) UITapGestureRecognizer *g;
@end
@implementation ItemView
- (instancetype)init {
self = [super init];
if (self) {
_disableTitleColor = TextFColor;
_selectedBgColor = ColorB;
_unSelectedBgColor = ColorG2;
_unSelectedTitleColor = TitleBColor;
_selectedTitleColro = ButtonBColor;
_minWidth = 70;
_contentView = [[UIView alloc] init];
_contentView.userInteractionEnabled = NO;
_contentView.layer.cornerRadius = 4;
_contentView.frameHeight = 28;
[self addSubview:_contentView];
_label = [[UILabel alloc] init];
_label.textAlignment = NSTextAlignmentCenter;
_label.userInteractionEnabled = NO;
_label.font = ButtonBFont;
_label.numberOfLines = 0;
[self addSubview:_label];
_isMultiLines = NO;
_g = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(click)];
_g.numberOfTapsRequired = 1;
[self addGestureRecognizer:_g];
}
return self;
}
- (void)click{
if (self.delegate && [self.delegate respondsToSelector:@selector(didSelected:)]) {
[self.delegate didSelected:self];
}
}
/// 设置 文本框的文字 文字的最小宽度 文字的字体
- (void)setText:(NSString *)text minWith:(CGFloat)minWith maxWith:(CGFloat)maxWith font:(UIFont *)font {
CGFloat offset = 10;
NSDictionary *dic = @{NSFontAttributeName: font};
CGFloat maxW = [UIScreen mainScreen].bounds.size.width - offset * 2;
CGSize stringSize = [text boundingRectWithSize:CGSizeMake(maxW, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil].size;
CGFloat singleLineWidth = [text sizeWithAttributes:dic].width; //计算单行字符串长度
CGFloat height = stringSize.height + offset;
if (height < 28) {
height = 28;
}
if (singleLineWidth > maxW) { //判断是否多行
stringSize.width = maxW;
self.isMultiLines = YES;
} else if (stringSize.width < minWith) { //判断是否小于最小宽度
stringSize.width = minWith;
}
self.label.frame = CGRectMake(offset, offset*0.5, stringSize.width, height);
self.contentView.frame = CGRectMake(offset * 0.5, offset * 0.5, stringSize.width + offset, height);
self.frame = CGRectMake(0, 0, self.label.frame.size.width + offset * 2, self.label.frame.size.height + offset * 2);
self.label.text = text;
self.label.font = font;
}
- (void)setItemSelected:(BOOL)itemSelected {
_itemSelected = itemSelected;
if (_itemSelected) {
[self.g setEnabled:YES];
self.contentView.layer.borderWidth = 0;
self.contentView.layer.borderColor = self.selectedTitleColro.CGColor;
self.contentView.backgroundColor = self.selectedBgColor;
self.label.textColor = self.selectedTitleColro;
} else {
[self.g setEnabled:YES];
self.contentView.layer.borderWidth = 0;
self.contentView.backgroundColor = self.unSelectedBgColor;
self.label.textColor = self.unSelectedTitleColor;
}
}
- (void)setItemDisable:(BOOL)itemDisable {
_itemDisable = itemDisable;
if (_itemDisable) {
[self.g setEnabled:NO];
self.contentView.layer.borderWidth = 0;
self.contentView.backgroundColor = self.unSelectedBgColor;
self.label.textColor = self.disableTitleColor;
}
}
#import <UIKit/UIKit.h>
#import "ItemView.h"
NS_ASSUME_NONNULL_BEGIN
@class ItemCollectionView;
/// 视图的协议
@protocol ItemViewDataSource <NSObject>
@required
/// 每一个格子是什么
- (ItemView *)itemCollectionView:(ItemCollectionView *)itemCollectionView cellForRowAtIndexPath:(NSIndexPath *)indexpath;
/// 每一行有多少个格子
- (NSInteger)itemCollectionView:(ItemCollectionView *)itemCollectionView numberOfRowsInSection:(NSInteger)section;
@optional
/// 一共有多少行
- (NSInteger)numberOfSectionsAt:(ItemCollectionView *)itemCollectionView;
/// 设置每一行的头视图
- (UIView *)itemCollectionView:(ItemCollectionView *)itemCollectionView headerInSection:(NSInteger)section;
/// 点击事件
- (void)itemCollectionView:(ItemCollectionView *)itemCollectionView didSelectedIndexPath:(NSIndexPath *)indexpath;
@end
/// 装载所有的小格子
@interface ItemCollectionView : UIScrollView
/// 数据代理
@property (nonatomic, weak) id<ItemViewDataSource> dataSource;
/// 重新创作视图
- (void)createCollectionView;
@end
NS_ASSUME_NONNULL_END
#import "ItemCollectionView.h"
@interface ItemCollectionView () <ItemViewDelegate>
/// 内容视图
@property (nonatomic, strong) UIView *contentView;
/// 每一行有多少个 默认 0 个
@property (nonatomic, assign) CGFloat rowCountOfSection;
/// 一共有多少行 默认1行
@property (nonatomic, assign) CGFloat sectionCount;
/// 临时数组
@property (nonatomic, strong) NSMutableArray *viewsArray;
/// 内部控件集合
@property (nonatomic, strong) NSArray *itemViewArray;
@end
@implementation ItemCollectionView
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
[self setUp];
}
return self;
}
- (void)awakeFromNib {
[super awakeFromNib];
[self setUp];
}
- (void)setUp {
_rowCountOfSection = 0;
_sectionCount = 1;
_viewsArray = [NSMutableArray array];
}
- (void)initView {
if (self.contentView != nil) {
[self.contentView removeFromSuperview];
}
self.contentView = [[UIView alloc] init];
[self addSubview:self.contentView];
/// 有多少行, 可选代理
if (self.dataSource && [self.dataSource respondsToSelector:@selector(numberOfSectionsAt:)]) {
self.sectionCount = [self.dataSource numberOfSectionsAt:self];
}
/// 每一行有多少个格子,必选
if (self.dataSource) {
BOOL a = [self.dataSource respondsToSelector:@selector(itemCollectionView:numberOfRowsInSection:)];
BOOL b = [self.dataSource respondsToSelector:@selector(itemCollectionView:cellForRowAtIndexPath:)];
NSAssert((a && b), @"代理对象没有遵守协议!");
} else {
NSAssert(NO, @"代理对象为空!");
}
CGFloat allSectionHeight = 0;
for (NSInteger i = 0; i < self.sectionCount; i++) {
UIView *sectionView = [[UIView alloc] init];
UIView *headView = [self.dataSource itemCollectionView:self headerInSection:i];
headView.frame = CGRectMake(headView.frame.origin.x, 0, self.bounds.size.width, headView.frame.size.height);
[sectionView addSubview:headView];
CGFloat offsetY = headView.frame.size.height;
UIView *lastrowCell;
self.rowCountOfSection = [self.dataSource itemCollectionView:self numberOfRowsInSection:i];
NSMutableArray *array = [NSMutableArray array];
ItemView *lastCell = nil; //最后一个单元
for (NSInteger k = 0; k < self.rowCountOfSection; k++) {
NSIndexPath *index = [NSIndexPath indexPathForRow:k inSection:i];
ItemView *rowCell = [self.dataSource itemCollectionView:self cellForRowAtIndexPath: index];
rowCell.delegate = self;
rowCell.indexPath = index;
if (lastCell) { //最后一个单元存在
if (CGRectGetMaxX(lastCell.frame) + rowCell.frame.size.width > self.bounds.size.width) { //新来的这个在后面放不下
offsetY += lastCell.frame.size.height; //放不下就放到下一行
rowCell.frame = CGRectMake(0, offsetY, rowCell.frame.size.width, rowCell.frame.size.height);
} else {
if (lastCell.isMultiLines) { //上一个是多行, 当前就另起一行
offsetY += lastCell.frame.size.height;
}
rowCell.frame = CGRectMake(CGRectGetMaxX(lastCell.frame), offsetY, rowCell.frame.size.width, rowCell.frame.size.height);
}
} else { //最后一个单元不存在
rowCell.frame = CGRectMake(0, offsetY, rowCell.frame.size.width, rowCell.frame.size.height);
}
lastCell = rowCell;
[sectionView addSubview:rowCell];
lastrowCell = rowCell;
[array addObject:rowCell];
}
CGFloat sectionHeight = CGRectGetMaxY(lastrowCell.frame) + 5; // +5是为了底部多留点空白
sectionView.frame = CGRectMake(0, allSectionHeight, self.bounds.size.width, sectionHeight);
[self.contentView addSubview:sectionView];
allSectionHeight += sectionHeight;
[self.viewsArray addObject:array];
}
self.contentView.frame = CGRectMake(0, 0, self.bounds.size.width, allSectionHeight);
if (allSectionHeight < self.frameHeight) {
self.contentSize = CGSizeMake(0, self.frameHeight+1);
}
else {
self.contentSize = self.contentView.frame.size;
}
self.itemViewArray = self.viewsArray;
}
#pragma mark - ItemViewDelegate
- (void)didSelected:(ItemView *)itemView {
for (ItemView *v in self.itemViewArray[itemView.indexPath.section]) {
if (v.itemDisable) { continue; }
v.itemSelected = NO;
}
itemView.itemSelected = YES;
if (_dataSource && [self.dataSource respondsToSelector:@selector(itemCollectionView:didSelectedIndexPath:)]) {
[self.dataSource itemCollectionView:self didSelectedIndexPath:itemView.indexPath];
}
}
- (void)createCollectionView {
[self setNeedsLayout];
[self layoutIfNeeded];
[self initView];
}
@end
#import <Foundation/Foundation.h>
NS_ASSUME_NONNULL_BEGIN
@interface ChooseSpecModel : NSObject
/// 名称
@property (strong,nonatomic) NSString *spec_name;
/// id
@property (strong,nonatomic) NSString *spec_id;
/// 详情列表
@property (strong,nonatomic) NSMutableArray *itemArray;
@end
typedef NS_ENUM(NSInteger, ItemType) { // 0 是默认值, 不能设置为 0
ItemDisable = 4, //不可选
ItemForceSelected = 1, //强制选中
ItemSelected = 2, //选中
ItemUnSelected = 3 //未选中
};
@interface SpecItemModel : NSObject
/// 名称
@property (strong,nonatomic) NSString *spec_item_id;
/// id
@property (strong,nonatomic) NSString *spec_item_name;
/// 自定义属性 标记选项状态
@property (assign,nonatomic) ItemType itemType;
@end
#import "ChooseSpecModel.h"
@implementation ChooseSpecModel
- (instancetype)init {
if (self = [super init]) {
_itemArray = [NSMutableArray array];
}
return self;
}
- (void)setValue:(id)value forUndefinedKey:(NSString *)key {
}
@end
@implementation SpecItemModel
@end
创建collectionView，需导入ORSKUDataFiltergit地址SKUDataFilter.
/// 商品选择视图
@property (nonatomic, strong) ItemCollectionView *itemCollectionView;
/// 数据
@property (strong, nonatomic) NSMutableArray *dataSource;
//ORSKUDataFilter
@property (nonatomic, strong) ORSKUDataFilter *filter;
- (void)drawSpecView {
self.itemCollectionView = [[ItemCollectionView alloc] initWithFrame:CGRectMake(20, 100, KScreenWidth-40, 300)];
self.itemCollectionView.dataSource = self;
[showView addSubview:self.itemCollectionView];
_selectedIndexPaths = [NSMutableArray array];
NSArray *spec_list = _productModel.spec_list;
self.dataSource = [NSMutableArray array];
for (NSDictionary *dic in spec_list) {
ChooseSpecModel *info = [[ChooseSpecModel alloc] init];
[info setValuesForKeysWithDictionary:dic];
for (NSDictionary *subDic in dic[@"value_list"]) {
SpecItemModel *item = [[SpecItemModel alloc] init];
[item setValuesForKeysWithDictionary:subDic];
item.itemType = ItemUnSelected;
[info.itemArray addObject:item];
}
[self.dataSource addObject:info];
}
_filter = [[ORSKUDataFilter alloc] initWithDataSource:self];
// 加载视图
[self.itemCollectionView createCollectionView];
}
#pragma mark -- ORSKUDataFilterDataSource
- (NSInteger)numberOfSectionsForPropertiesInFilter:(ORSKUDataFilter *)filter {
return self.dataSource.count;
}
- (NSArray *)filter:(ORSKUDataFilter *)filter propertiesInSection:(NSInteger)section {
ChooseSpecModel *specModel = (ChooseSpecModel *)self.dataSource[section];
NSMutableArray *temArr = [[NSMutableArray alloc]init];
[specModel.itemArray enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
SpecItemModel *item = (SpecItemModel *)obj;
[temArr addObject:item.spec_item_id];
}];
return temArr;
}
- (NSInteger)numberOfConditionsInFilter:(ORSKUDataFilter *)filter {
return _skuData.count;
}
- (NSArray *)filter:(ORSKUDataFilter *)filter conditionForRow:(NSInteger)row {
NSString *condition = _skuData[row][@"spec_item_id_list"];
return [condition componentsSeparatedByString:@","];
}
- (id)filter:(ORSKUDataFilter *)filter resultOfConditionForRow:(NSInteger)row {
NSDictionary *dic = _skuData[row];
return @{@"price" : dic[@"price"],
@"store" : dic[@"store"],
@"sku_id" : dic[@"sku_id"]};
}
#pragma mark - ItemViewDataSource 代理
- (NSInteger)numberOfSectionsAt:(ItemCollectionView *)itemCollectionView {
return self.dataSource.count;
}
- (NSInteger)itemCollectionView:(ItemCollectionView *)itemCollectionView numberOfRowsInSection:(NSInteger)section {
ChooseSpecModel *info = self.dataSource[section];
return info.itemArray.count;
}
- (ItemView *)itemCollectionView:(ItemCollectionView *)itemCollectionView cellForRowAtIndexPath:(NSIndexPath *)indexpath {
ChooseSpecModel *info = self.dataSource[indexpath.section];
SpecItemModel *item = info.itemArray[indexpath.row];
ItemView *v = [[ItemView alloc] init];
[v setText:item.spec_item_name minWith:70 maxWith:showView.frameWidth-40 font:TitleBFont];
if ([_filter.availableIndexPathsSet containsObject:indexpath]) {
v.itemSelected = NO;
}else {
v.itemDisable = YES;
}
if ([_filter.selectedIndexPaths containsObject:indexpath]) {
v.itemSelected = YES;
}
return v;
}
- (UIView *)itemCollectionView:(ItemCollectionView *)itemCollectionView headerInSection:(NSInteger)section {
ChooseSpecModel *info = self.dataSource[section];
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(15, 0, 0, 40)];
label.text = info.spec_name;
label.font = TitleBFont;
label.textColor = TitleBColor;
return label;
}
- (void)itemCollectionView:(ItemCollectionView *)itemCollectionView didSelectedIndexPath:(NSIndexPath *)indexpath {
[_filter didSelectedPropertyWithIndexPath:indexpath];
[_itemCollectionView createCollectionView];
NSSet *selectedIndexPaths = _filter.selectedIndexPaths;
// 查看结果
NSMutableString *tempresult = [NSMutableString string];
[selectedIndexPaths enumerateObjectsUsingBlock:^(id _Nonnull obj, BOOL * _Nonnull stop) {
NSIndexPath *indexPath = (NSIndexPath *)obj;
ChooseSpecModel *infoR = self.dataSource[indexPath.section];
SpecItemModel *itemR = infoR.itemArray[indexPath.row];
if (tempresult.length > 0) {
[tempresult appendFormat:@","];
}
[tempresult appendFormat:@"%@", itemR.spec_item_name];
}];
}
以上为全部实现代码，具体理解如下
[indexPath(0,0),indexPath(0,1),indexPath(0,2),
indexPath(1,0),indexPath(1,1),
indexPath(2,0),indexPath(2,1)]
每一个规格所在的indexPath
每一条sku都有按照section的顺序都可以根据indexPath.row生成一个所在位置的数组，例如SKU A2+1颗/约4.9分+K金 可以写成[0,0,1]，那么四种组合方式可以得到四个数组
valid_paths = [[0,0,1],[2,0,1],[1,1,0],[2,1,0]]
根据有效的sku获取到所有可以点击的item数组
NSMutableSet *set = [NSMutableSet set];//set为所有可点击的item的indexPath的集合
[valid_paths enumerateObjectsUsingBlock:^(id *_Nonnull obj, BOOL * _Nonnull stop) {
[obj enumerateObjectsUsingBlock:^(NSNumber * _Nonnull obj1, NSUInteger idx, BOOL * _Nonnull stop1) {
[set addObject:[NSIndexPath indexPathForItem:obj inSection:idx]];
}];
}];
当第一次点击了K金所在的item，selectedIndexPath的值为(2,1),遍历valid_paths数组，获取可点击indexPath的数组，再将当前可点击数组与之前所有可点击item数组取交集，就是当前可以点击的按钮。
[valid_paths enumerateObjectsUsingBlock:^(id *_Nonnull obj, BOOL * _Nonnull stop) {
//假设obj为[2,1,0]时，即有效sku为A3+1颗/约0.6分+钻石时，选中的item为该sku中的一项规格。
//此时obj中的[2，1，0]转换成indexPath的数组时，应该是paths = [(0,2),(1,1),(2,0)],遍历paths
if(obj[selectedIndexPath.section] == selectedIndexPath.row){
[paths enumerateObjectsUsingBlock:^(NSindexPath * _Nonnull indexPath, NSUInteger idx, BOOL * _Nonnull stop1) {
if(selectedIndexPath.section == indexPath.section) {
//兄弟item都为可选择
}
else {
//如果其他section中indexPath.row == selectedIndexPath.row,则也为可选择
}
}];
}
}
}];
刷新数据，页面就显示初当前选择的item和其他可选择的数据item，不可选择的则置灰
已经选中了某个item，点击第二个item时则和上面方法一样，此时会得到一个新的可以选择的item的集合，将第二次的集合与第一次的集合取交集则得到一个新的可以选择的item的集合
总结
我在一开始陷入了一个死循环，幸亏及时看到了大佬OrangeAL的文章iOS-SKU商品规格组合算法详解的文章，git地址SKUDataFilter.
在此感谢！
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