Loop in NSArray and add Object to NSMutableArray

Question

I have been trying so hard to loop in NSArray parse it and then add it to NSMutableArray. the issue is not with parsing i wanted to loop over the whole NSArray.

Here is my code:

 if let dictionarys : NSArray = dictionary.valueForKey("response") as? NSArray {

            var categoryNum = 0
            var currency = "0"

            if let category: NSArray = dictionarys.valueForKey("category") as? NSArray {
                if let catId = category.valueForKey("categoryID") as? NSArray {
                   categoryNum = catId[0] as! Int
                }
            }
            if let currency1: NSArray = dictionarys.valueForKey("currency") as? NSArray {
                if let currency2 = currency1[0] as? String {
                    currency = currency2
                }
            }

serviceObject = ServicesObject(categoryId: categoryNum,currency: currency)
CategoryItems.addObject(serviceObject)


}
self.tableView.reloadData()

i want to do something like this :

            for (var i = 0;i<dictionarys.count ; i++){

     var categoryNum = 0
                var currency = "0"

                if let category: NSArray = dictionarys.valueForKey("category") as? NSArray {
                    if let catId = category.valueForKey("categoryID") as? NSArray {
                       categoryNum = catId[0] as! Int
                    }
                }
                if let currency1: NSArray = dictionarys.valueForKey("currency") as? NSArray {
                    if let currency2 = currency1[0] as? String {
                        currency = currency2
                    }
                }

    serviceObject = ServicesObject(categoryId: categoryNum,currency: currency)
    CategoryItems.addObject(serviceObject)

}

a sample of what I'm trying to parse i did : print(dictionarys)

(
        {
        category =         {
            category = "<null>";
            categoryID = 66;
        };
        currency = 2;

    },{
        category =         {
            category = "<null>";
            categoryID = 66;
        };
        currency = 2;

    },{
        category =         {
            category = "<null>";
            categoryID = 66;
        };
        currency = 2;

    }
)

You stated that dictionarys : NSArray, you might want a dictionary instead. — zc246
– zc246, Commented Jan 28, 2016 at 14:28
the response i get it as NSArray and because i am using singleton class for http calls, the method call parameter is nsdictionary so when i get the response as NSArray i place it in NSDictionary only to send it for controller delegate. and then parse it over there. so its an NSArray, its just a name. — Nata Mio
– Nata Mio, Commented Jan 28, 2016 at 14:32
for (var i = 0;i<dictionarys.count ; i++) Argh, don't do this in Swift, please, never never never. Read the Swift Guide and see how to make a proper loop instead. — Eric Aya
– Eric Aya, Commented Jan 28, 2016 at 14:40

user887210 · Accepted Answer · 2016-01-28 15:55:08Z

I made your example a bit more Swifty and added some mocked classes to get it all to work in a simple Playground:

import Foundation

class ServicesObject {
  var categoryId: Int
  var currency: String
  init(categoryId: Int, currency: String) {
    self.categoryId = categoryId
    self.currency = currency
  }
}

class CategoryItems {
  static func addObject(item: ServicesObject) {
    print("Added categoryID \(item.categoryId), currency \(item.currency)")
  }
}

let dictionary: NSArray = [
  ["response":
    ["category":
      ["category":"<null>",
        "categoryID":66],
     "currency": "2"]],
  ["response":
    ["category":
      ["category":"<null>",
        "categoryID":67],
    "currency": "3"]],
  ["response":
    ["category":
      ["category":"<null>",
        "categoryID":68],
    "currency": "4"]]]

if let responses = dictionary.valueForKey("response") as? NSArray {
  for response in responses where response is NSDictionary { // loop over all responses
    var categoryNums = 0
    if let category = response["category"] as? NSDictionary {
        categoryNums = category["categoryID"] as? Int ?? 0
    }
    var currency = response["currency"] as? String ?? "0"
    let serviceObject = ServicesObject(categoryId: categoryNums, currency: currency)
    CategoryItems.addObject(serviceObject) // add all responses
  }
}

There's some fancier stuff in there such as the nil coalescing operator (??) but hopefully it will work as an example.

Eric Aya · Accepted Answer · 2016-01-28 15:01:20Z

1

I've taken your JSON sample and made this very simple example for you to get the idea of a proper Swift loop, this is probably what you need to adapt for your actual code base and data.

Given that "dictionarys" is an NSArray of NSDictionaries:

for dict in dictionarys {
    if let curr = dict["currency"] as? Int {
        print("Currency: \(curr)")
    }
    if let category = dict["category"] as? NSDictionary {
        if let ID = category["categoryID"] as? Int {
            print("ID: \(ID)")
        }
    }
}

answered Jan 28, 2016 at 15:01

Eric Aya

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2 Comments

Nata Mio Over a year ago

Thank you very much , i will check it out ! :)

Nata Mio Over a year ago

@Kenneth Bruno, gave me new information with new way of handling ! thanks for helping :)

turushan · Accepted Answer · 2016-01-28 14:28:38Z

0

You can initialize array with another array if you trying to do that try this.

var nsmutablearrayVariableName = NSMutableArray.init(array: nsarrayVariableName)

answered Jan 28, 2016 at 14:28

turushan

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2 Comments

Nata Mio Over a year ago

i didn't ask to initialize another array , i want to loop in my NSArray values and add each time the object in Another NSMutableArray. so this is not an answer.

turushan Over a year ago

this method does exactly that, add each value to another array with initializing.

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