ios - 过滤器在 ios 中不起作用

Question

我使用 NsPredicate 按一个和多个值过滤 NSMutableArray，首先我尝试按价格过滤，我已将 NSDictionary 值保存到 NSMutableArray (即)resultArray，这是我的代码帮助我，

    for (int i=0; i<=resultArray.count; i++)
    {
            NSDictionary *dict=resultArray[i];
            NSLog(@"Dict %@",dict);
            NSPredicate *predit=[NSPredicate predicateWithFormat:@"(Price == %@)", @"100"];
            NSArray *resultAr = [[dict allValues] filteredArrayUsingPredicate:predit];
            NSLog(@"Output %@",resultAr);
    }


Dict {
    Name = "Black Eyed Peas";
    Percentage = 0;
    Price = 80;
}

结果数组是:

 Result (
        {
        Name = "Black Eyed Peas";
        Percentage = 0;
        Price = 80;
    },
        {
        Name = "Black Gram";
        Percentage = 0;
        Price = 56;
    },
        {
        Name = "Channa White";
        Percentage = 0;
        Price = 100;
    },
        {
        Name = "Double Beans";
        Percentage = 0;
        Price = 95;
    },
        {
        Name = "Gram Dall";
        Percentage = 0;
        Price = 100;
    },
        {
        Name = "Green Moong Dal";
        Percentage = 0;
        Price = 150;
    },
        {
        Name = "Ground Nut";
        Percentage = 0;
        Price = 140;
    },
        {
        Name = "Moong Dal";
        Percentage = 0;
        Price = 75;
    },
        {
        Name = "Orid Dal";
        Percentage = 0;
        Price = 100;
    },
        {
        Name = "Toor Dal";
        Percentage = 0;
        Price = 150;
    }
) 

预期输出为

(
            {
            Name = "Channa White";
            Percentage = 0;
            Price = 100;
        },
            {
            Name = "Gram Dall";
            Percentage = 0;
            Price = 100;
        },          
            {
            Name = "Orid Dal";
            Percentage = 0;
            Price = 100;
        }
)

但它给出了错误

 reason: '[<__NSCFNumber 0x146db5e0> valueForUndefinedKey:]: this class is not key value coding-compliant for the key Price. 

上面的代码对于过滤来说是正确的，否则给我一个过滤 resultArray 以获得预期输出的想法

Answer 1

按照下面的代码。我在这里使用谓词。

        NSPredicate *predit=[NSPredicate predicateWithFormat:@"Price like %@",100];
        NSArray *resultAr = [resultArray filteredArrayUsingPredicate:predit];

在上面的代码中

如果您给LIKE，它会给出相同的价格数据。

您必须从代码中删除或删除 [dict allValues]。

您需要添加 resultArray 而不是 [dict allValues]。因为它是数组。