使用 NSPredicate 确定一个字符串是否等于另一个字符串

发布于 2024-09-04 02:24:32 字数 571 浏览 5 评论 0原文

我有一个使用 [CalCalendarStore eventPredicateWithStartDate] 方法返回的 CalEvents 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。

我可以使用以下代码将标题包括 @"on call" 的事件保留在数组中（其中“events”是填充有 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：

@"SELF.title == 'on call'" 但这似乎不起作用。

有没有更简单的方法来做到这一点？

原文

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).

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];

I've tried using a predicate format string like:

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

Is there an easier way to do this?

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莫多说 2024-09-11 02:24:32

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

（[c] 使相等比较不区分大小写。）

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妖妓 2024-09-11 02:24:32

尝试使用格式 @"self.title like[c] 'on call'" 的谓词。以下示例代码输出 2 个字符串：

NSArray* ar = [NSArray arrayWithObjects:@"on call", @"I'm on call", @"lala", @"On call", nil];
NSArray* filt = [ar filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"self like[c] 'on call'"]];
NSLog([filt description]);

//Output
"on call",
"On call"

Try predicate with format @"self.title like[c] 'on call'". The following sample code outputs 2 strings:

NSArray* ar = [NSArray arrayWithObjects:@"on call", @"I'm on call", @"lala", @"On call", nil];
NSArray* filt = [ar filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"self like[c] 'on call'"]];
NSLog([filt description]);

//Output
"on call",
"On call"

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