NSPredicate不使用字典数组

本文介绍了NSPredicate不使用字典数组的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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".