iphone - coredate mul_condition 过滤器

Question

我使用了codedate，我想用它NSPredicate来过滤结果。我有一个实体，有三个字段：from 和to。例如：

从 到 信息

AA BB 11111

aa cc y6767

bb aa 4545

bb dd 3434

所以我想得到from=aa and to=bbor from =bb and to=aa，所以结果是：

从 到 信息

AA BB 11111

bb aa 4545

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(from == %@) AND (to > %@) OR (from == %@) and (to == %@)",from, to,to ,from] ;

或 NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(from == %@) AND (to > %@) OR ((from == %@) and (to == %@))",from,to,to ，从];

Answer 1

尝试

 [NSPredicate predicateWithFormat:@"(from == %@ AND to == %@) OR (from == %@ AND to == %@)",
        from, to, to, from]