CoreData NSPredicate 按日期获取数据

Posted 2023-03-05

【中文标题】CoreData NSPredicate 按日期获取数据

【英文标题】：CoreData NSPredicate fetch data by Date

【发布时间】：2015-01-29 10:38:16

【问题描述】：

请帮我做这个谓词

[NSPredicate predicateWithFormat:[NSString stringWithFormat:@"subsidiary_of_cat_id == %@ AND (valid_from < %@) AND (valid_till > %@ OR valid_till == %@) ",catId,[NSDate date],[NSDate date], dateTo,]]

接收崩溃错误：无法解析格式字符串

从CoreData获取数据的条件

条件 1：now() 条件二：now() > valid_from

谢谢！

已解决：更新代码

NSMutableArray *predicatesArray = [NSMutableArray array];
    [predicatesArray addObject:[NSPredicate predicateWithFormat:@"%@ == subsidiary_of_cat_id",catId]];
    [predicatesArray addObject:[NSPredicate predicateWithFormat:@"%@ > valid_from",[NSDate date]]];
    [predicatesArray addObject:[NSPredicate predicateWithFormat:@"%@ < valid_till",[NSDate date]]];
    [predicatesArray addObject:[NSPredicate predicateWithFormat:@"%@ == valid_till”,dateTo];
[NSCompoundPredicate orPredicateWithSubpredicates:predicatesArray]

【问题讨论】：

我已经通过 [NSCompoundPredicate orPredicateWithSubpredicates:predicatesArray] 解决了它

【参考方案1】：

您不需要将字符串包装在stringWithFormat：

[NSPredicate predicateWithFormat:@"subsidiary_of_cat_id == %@ AND (valid_from < %@) AND (valid_till > %@ OR valid_till == %@) ",catId,[NSDate date],[NSDate date], dateTo];