CoreData NSPredicate按日期獲取數據

Question

請幫我做這個謂詞

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

收到崩潰錯誤：無法解析格式字符串

從CoreData獲取數據的條件

條件1：now（）<valid_till或now（）= [NSDate date]
條件2：now（）> valid_from

謝謝！

解決：更新的代碼

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]

Answer 1

您不需要將字符串包裝在stringWithFormat ：

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