过滤器在ios中不起作用
过滤器在ios中不起作用
提问于 2015-07-14 20:04:18
我使用NsPredicate通过一个和多个值来过滤NSMutableArray，首先我尝试通过价格过滤，我已经将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;
}结果数组为：
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;
}
)但是它给出了错误
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是正确的，否则给我一个过滤resultArray以获得预期输出的想法
Stack Overflow用户
发布于 2015-07-14 20:31:02
遵循下面的代码。我在这里使用谓词。
NSPredicate *predit=[NSPredicate predicateWithFormat:@"Price like %@",100];
NSArray *resultAr = [resultArray filteredArrayUsingPredicate:predit];在上述代码中
如果你给像这样的，它会给出相同的价格数据。
你必须从代码中删除或移除dict allValues。
你需要添加数组，而不是dict数组，它是resultArray.Because。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/31406074
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