Objective c NSPredicate不使用字典数组

我有一份格式如下的NSPredication:

@“Status CONTAINS[cd]shipped”

我有一个字典数组，下面是一个示例：

{
        {
        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;
    }
)

---

但它返回的是一个空数组。我做错了什么？谢谢

您可以对字符串使用关键字

匹配

，

包含

等。因为状态不是一个字符串，我想，你需要像这样检查它

[NSPredicate predicateWithFormat:@"Status = %d", Shipped];

你想要：

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

或：

您的问题是您的谓词格式已经发出了

，
，而它本应该发出
，
。缺少单引号意味着它试图将
[dictionary valueForKey:@“Status”]
与
[dictionary valueForKey:@“shipped”]
进行比较，而不是与字符串文字
@“shipped”
进行比较

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