有这样一个需求，按月显示账单，每个月是一个组，组头是显示月份，列表显示每笔交易数据，这个时候后端无法直接返回这种数据（难道每个月的数据刚好是一页？），所以只能按分页去请求对应那一页的数据（数据带上时间戳就行了），前端处理思路，循环遍历本地所有数据（到加载当前页和之前所有页数据），按时间戳转成年月，加到对应那条数据模型中去，并且用这个带有年月的模型替换之前的数据模型，并且把这个年月放的一个set里面，遍历set 按set里面的年月创建谓词筛选器，把总数据用过滤方法得到新的数组,在添加的最终的数组sectionArary中
/*******************************************分组相关********************************************************/
- (void)sectionWithListForDate
{
[self.sectionArary removeAllObjects];
NSMutableSet *set=[NSMutableSet set];
NSInteger count = self.listData.data.count;
for (NSInteger i =0 ;i < count; i++) {
//时间
NSMutableDictionary * modelDic = self.listData.data[i];
NSString * timeStamp = STR_OBJ(modelDic[@"created_at"]);
NSDate * time = [NSDate dateWithTimestamp:timeStamp];
NSString * yearMonth = [NSString stringWithFormat:@"%ld-%02ld", [time yearIndex],[time monthIndex]] ;
modelDic[@"year_month"] = yearMonth;
[self.listData.data replaceObjectAtIndex:i withObject:modelDic];
[set addObject:yearMonth];//利用set不重复的特性,得到有多少组,根据数组中的created_at字段
}
// NSMutableSet *set=[NSMutableSet set];
// [self.listData.data enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
// //时间
// NSDictionary * modelDic = obj;
// NSString * timeS = STR_OBJ(modelDic[@"created_at"]);
//
// [set addObject:timeS];//利用set不重复的特性,得到有多少组,根据数组中的created_at字段
// }];
[set enumerateObjectsUsingBlock:^(id obj, BOOL *stop) {//遍历set数组
MLOG(@"obj=%@",obj);
NSString * yearMonth = obj;
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"year_month = %@", yearMonth];//创建谓词筛选器
NSArray *groupList = [self.listData.data filteredArrayUsingPredicate:predicate];//用数组的过滤方法得到新的数组,在添加的最终的数组sectionArary中
NSMutableDictionary * mothDate = [NSMutableDictionary dictionary];
[mothDate setValue:groupList forKey:@"list"];
[mothDate setValue:yearMonth forKey:@"time"];
[self.sectionArary addObject:mothDate ];
NSInteger sectionIndex = [self.sectionArary indexOfObject:mothDate];
//按年月去请求对应月份的的相关信息及数据
[self requsetMonthInAndOut:yearMonth sectionIndex:sectionIndex];
}];
[self.sectionArary sortUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
NSString * time1 = obj1[@"time"];
NSDate * date1 = [NSDate ym_dateFromString:time1 format:@"yyyy-MM"];//[NSDate dateWithString:time1 format:@"yyyy年MM月"];
long long timeSp1 = [[NSNumber numberWithDouble:[date1 timeIntervalSince1970]] longLongValue];
NSString * time2 = obj2[@"time"];
NSDate * date2 = [NSDate ym_dateFromString:time2 format:@"yyyy-MM"];//[NSDate dateWithString:time2 format:@"yyyy年MM月"];
long long timeSp2 = [[NSNumber numberWithDouble:[date2 timeIntervalSince1970]] longLongValue];
return timeSp1 < timeSp2;
}];
}
- (void)requsetMonthInAndOut:(NSString*)yearMonth sectionIndex:(NSInteger)sectionIndex
{
// NSString * timeStr = [yearMonth stringByReplacingOccurrencesOfString:@"年" withString:@"-"];
// timeStr = [timeStr stringByReplacingOccurrencesOfString:@"月" withString:@""];
NSMutableDictionary * param = [NSMutableDictionary dictionary];
[param setObject:NON(self.shopIdStr) forKey:@"shop_id"];
[param setObject:NON(yearMonth) forKey:@"month"];
@weakify(self)
[self showHUD];
[[RequestClient sharedInstance] requestTransferRecordMonthInfo:param
success:^(NSURLSessionDataTask *operation, id responseObject) {
@strongify(self)
[self hideHUD];
NSMutableDictionary * monthData = self.sectionArary[sectionIndex];
monthData[@"in"] = responseObject[@"in"];
monthData[@"out"] = responseObject[@"out"];
[self.sectionArary replaceObjectAtIndex:sectionIndex withObject:monthData];
//刷新
[self.tableView reloadSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationNone];
[self endRefreshing];
_isFirstLoad = NO;
}
failure:^(NSURLSessionDataTask *operation, NSError *error) {
@strongify(self)
[self hideHUD];
[self showError:error];
[self endRefreshing];
_isFirstLoad = NO;
}];
}