NSPredicate不使用字典数组 [英] NSPredicate not working with array of dictionaries

问题描述

我有一个NSPredication，格式如下： @Status CONTAINS [cd] shipped

I have an NSPredication with format like this:@"Status CONTAINS[cd] shipped"

有一个字典数组，这里有一个例子：

I have an array of dictionary, here's an example:

{
        {
        Category = "Category 4";
        Comp = "Category 4";
        Depth = 02;
        Grade = New;
        Length = 02;
        Location = "Thousand Oaks, CA";
        Name = "3ply Mat";
        Owner = "Owner 3";
        PUP = 2;
        Status = Shipped;
        "Unit Number" = 20110507113852351;
        Width = 02;
    },
        {
        Category = "Category 4";
        Comp = "Category 4";
        Depth = 02;
        Grade = New;
        Length = 02;
        Location = "Thousand Oaks, CA";
        Name = "3ply Mat";
        Owner = "Owner 3";
        PUP = 2;
        Status = Shipped;
        "Unit Number" = 20110516094641587;
        Width = 02;
    }
)

但它返回一个空数组。我做错了什么？感谢

But it's returning an empty array. What am I doing wrong? Thanks

推荐答案

您想要：

[NSPredicate predicateWithFormat:@"Status =[cd] 'shipped'"];

或：

[NSPredicate predicateWithFormat:@"Status =[cd] %@", @"shipped"];

您的问题是您的谓词格式发货，当它应该有'shipped'。缺少单引号意味着它试图比较 [dictionary valueForKey：@Status] 到 [dictionary valueForKey：@shipped] ，而不是字符串文字 @shipped。

Your problem was that your predicate format had shipped, when it should've had 'shipped'. The lack of singles quotes meant it was trying to compare [dictionary valueForKey:@"Status"] to [dictionary valueForKey:@"shipped"], instead of to the string literal @"shipped".

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