使用NSPredicate确定一个字符串是否等于另一个字符串 [英] Using NSPredicate to determine if a string equals another string

问题描述

我用[CalCalendarStore eventPredicateWithStartDate]方法返回了CalEvents的NSArray.从返回的事件中，我试图仅保留那些事件标题== @"on call"(不区分大小写)的事件.

I have an NSArray of CalEvents returned with the [CalCalendarStore eventPredicateWithStartDate] method. From the events returned, I am trying to keep only those in which the title of the event == @"on call" (case-insensitive).

我能够使用以下代码将标题为包括 @"on call"的那些事件保留在数组中(其中"events"是填充有CalEvents的"NSArray"):

I am able to keep in the array those events whose title includes @"on call" with the following code (where 'events' is a 'NSArray' populated with CalEvents):

NSPredicate *onCallPredicate = [NSPredicate predicateWithFormat:@"(SELF.title CONTAINS[c] 'on call')"];
[events filteredArrayUsingPredicate:onCallPredicate];

我尝试使用谓词格式字符串，例如:

I've tried using a predicate format string like:

@"SELF.title == 'on call'"，但这似乎不起作用.

@"SELF.title == 'on call'" but this doesn't seem to work.

有更简单的方法吗?

推荐答案

尝试[NSPredicate predicateWithFormat:@"title ==[c] 'on call'"];

([c]使相等比较不区分大小写.)

(The [c] makes the equality comparison case-insensitive.)

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