CODEWITHSUNDEEP
arraysswiftdeep-copy
Ali Murad
Ali Murad

Reputation: 19

How to make a copy of a swift array of class objects

In code below, list1 is original Array. when i copy list1 in list2, it passes "allCardList" array as reference but i want to create copy of list1 so when i change in list2 it shouldn't change original Array (list1)

class Card {
    var availableBalance        = "5"
}
class DataCacheManager: NSObject {
    var allCardList             = [Card]()
}
var card = Card()
card.availableBalance = "10"

var list1 = DataCacheManager()
list1.allCardList.append(card)

var list2 = DataCacheManager()

for item in list1.allCardList {
    list2.allCardList.append(item)
}

list2.allCardList[0].availableBalance = "20"

print(list1.allCardList[0].availableBalance) // print 20 but should return 10

Any help you that?

Upvotes: 1

Views: 3128

Answers (3)

Gihan
Gihan

Reputation: 2536

Please read these references How do I make a exact duplicate copy of an array?1 and deep copy array In you case there other ways to achive your requirement without copying the whole array. For a example you could have an readonly original value as a object in Card and have another variable for the new value and so on.

Upvotes: 0

glyvox
glyvox

Reputation: 58029

Take a look at this question, it describes the process of copying a single object.

Implementing copy() in Swift

After you added the ability of copying, iterate through your array with a for loop to create a copied array from your existing data.

Upvotes: 0

vadian
vadian

Reputation: 285069

A class has reference semantics. The simplest solution is to use value semantics

struct Card ...

Upvotes: 2

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