将日期字符串与NSPredicate进行比较 [英] Comparing date string with NSPredicate

问题描述

我想知道是否可以使用按日期排序的 NSPredicate 过滤集合，其中日期是 MMMM dd 中的 NSString (例如3月24日)(不是NSDate.).

I was wondering if there's anyway to filter a set using NSPredicate sorted by date, where the date is an NSString in MMMM dd (i.e. March 24) format (it's NOT an NSDate.).

推荐答案

如果将日期作为字符串存储在CoreData中，则谓词很简单.

If you are storing the date as a string in CoreData, the predicate is simple.

    NSPredicate* predicate = [NSPredicate predicateWithFormat:@"theDate like %@", theDateString];

但是我猜测日期存储为NSDate对象.查看使用 NSDateFormatter 将您的字符串转换为NSDate.

But I'm guessing that the date is stored as an NSDate object. Look into using NSDateFormatter to convert your string to an NSDate.

NSDateFormatter* df = [[NSDateFormatter alloc] init];
[df setDateFormat:@"MMMM dd"];
NSDate* theDate = [df dateFromString:theDateString];
NSPredicate* predicate = [NSPredicate predicateWithFormat:@"SomeDate >= %@", theDate];

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