Retrieve NSDictionary from NSArray where dictionary key has value X

问题

I have an NSArray with NSDictionaries. One of the dictionaries keys in one of the arrays contains a value. I want to retrieve the NSDictionary with that value.

My array:

Array: (
        {
        DisplayName = "level";
        InternalName = "Number 2";
        NumberValue = 1;
    },
        {
        DisplayName = "PurchaseAmount";
        InternalName = "Number 1";
        NumberValue = 3500;
    }
)

So, I would like to get the dictionary which contains DisplayName set to PurchaseAmount (case insensitive).

How can I accomplish that?

回答1:

LIKE[cd] will also do it

NSArray *filtered = [data filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(DisplayName LIKE[cd] %@)", @"purchaseAmount"]];

returned

<NSArray>(
    {
       DisplayName = PurchaseAmount;
       InternaName = "Number 1";
       NumberValue = 3500;
    }
)

回答2:

The following solved my problem:

NSArray *filtered = [promotions filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(DisplayName == %@)", @"PurchaseAmount"]];
NSDictionary *item = [filtered objectAtIndex:0];

Thnx to user Nate for his comment on my question!

回答3:

Use NSPredicate this way

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"DisplayName LIKE[cd] 'PurchaseAmount' "];
NSArray *filter = [array filteredArrayUsingPredicate:predicate];
NSLog(@"%@",filter);

Here filter will hold your dictionaries which contains DisplayName set to PurchaseAmount (case insensitive)

回答4:

Answer in Swift,

let predicate = NSPredicate(format: "name contains[cd] %@", stringLookingFor)
let newList = data .filteredArrayUsingPredicate(predicate)

The data nsarray looks like this

[
 {
   name = Carlos,
   total = 9
 },
 {
   name = Willy,
   total = 2
 }
]

回答5:

  NSPredicate *predicate = [NSPredicate predicateWithFormat:@"DisplayName == 'level'"];
  NSArray *arrOutput = [[Array filteredArrayUsingPredicate:predicate] mutableCopy];

with the help of above 2 lines you will get all dictionary with DisplayName = "PurchaseAmount"

来源：https://stackoverflow.com/questions/15831183/retrieve-nsdictionary-from-nsarray-where-dictionary-key-has-value-x

标签

ios

objective-c

nsarray

nsdictionary