NSPredicate-带参数的动态谓词

问题描述

我是NSPredicates的新手，但我知道基本知识.

I am new to NSPredicates, but I know the basics.

这是我的谓词现在的样子:

This is how my predicate looks now:

[NSPredicate predicateWithFormat:@"name contains[c] %@", searchText];

我想做的是能够创建这样的谓词(伪代码):

What I want to do, is to be able to create a predicate like this (Pseudo code):

NSPredicate *myPredicate = [NSPredicate predicateWithBaseString:@"name contains[c] _ARGUMENT_"];

然后在例如循环(伪代码)中使用它:

And then use it in, for example a loop (pseudo code):

for(NSString *searchString in self.allStrings)
{
    NSPredicate *myNewPredicate = [myPredicate predicateWithArgument:searchString];
    //Here I do the searchOperations with my new predicate
}

我想这样做，以便可以有一些基本谓词，然后将参数放在它们上进行搜索.我不想再次创建谓词.

I want to do this so that I can have a few base predicates and then put parameters on them for searching. I do not want to create my predicate again.

希望您能理解.

谢谢！

推荐答案

使用以下

NSPredicate *myPredicate = [NSPredicate predicateWithFormat:@"name contains[c] $ARGUMENT"];

for(NSString *searchString in self.allStrings)
{
    NSPredicate *myNewPredicate = [myPredicate predicateWithSubstitutionVariables:@{@"ARGUMENT" :searchString}];
    //Here I do the searchOperations with my new predicate
}

我也建议您阅读这篇文章 http://nshipster.com/nspredicate/

also I suggest to read this article http://nshipster.com/nspredicate/

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