Swift updating property of an object in Array, doesn't work

Question

I trying to update property of an object in an array and it doesn't work. I tried replacing the whole object in the array, but it didn't help

let object = myArray[0]
object.property = "new value"
myArray[0] = object
print(object.property) //"new value"

let sameObject = myArray[0]
print(sameObject.property) //"old value"

EDIT: I found it!!! The array was singelton property. I was calling MyClass().myArray, instead of calling MyClass.sharedInstance.myArray

I just copied your code into a playground and it is working fine. The value is updated and the secondObject.property is "new value". — Adam
– Adam, Commented Sep 22, 2015 at 12:12
@sasquatch, I tried it the first thing. But the value was not saved — Luda
– Luda, Commented Sep 22, 2015 at 13:30
@Adam, I simplified the code t=for the question. I'll update my question with the original code — Luda
– Luda, Commented Sep 22, 2015 at 13:31

some_id · Accepted Answer · 2015-09-22 11:57:45Z

5

This depends on what it is in the array. If its a class it will be a reference to the instance. If it is a struct, you will get a copy of it when you assign, leading to the changes you made to the copy not being applied to the object.

What is in the array?

answered Sep 22, 2015 at 11:57

some_id

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1 Comment

Luda Over a year ago

I found it!!! The array was singelton property. I was calling MyClass(). myArray, instead of calling MyClass.sharedInstance.myArray

Community · Accepted Answer · 2017-05-23 11:51:34Z

0

I think is because you are declaring the array let: it means that it will remain unchanged. Try to declare it as var and then it should work.

EDIT You are right, I think I misunderstood your question then; but i found this answer that can be useful; at the end you should declare it var.

edited May 23, 2017 at 11:51

CommunityBot

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answered Sep 22, 2015 at 11:58

Nicholas Allio

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2 Comments

saurabh Over a year ago

object is not being changed. There is no need to declare it as var

Luda Over a year ago

I found it!!! The array was singelton property. I was calling MyClass(). myArray, instead of calling MyClass.sharedInstance.myArray

Luda · Accepted Answer · 2015-09-22 20:44:54Z

0

I found it!!! The array was singelton property. I was calling MyClass(). myArray, instead of calling MyClass.sharedInstance.myArray

answered Sep 22, 2015 at 20:44

Luda

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