How do I get the index for an element in a NSMutableArray in Swift?

Question

Simple question, but after literally hours of searching and a few hundred hairs lost, I can't find the way to get the index for an element in an NSMutableArray in Swift.

If someone knows how to do it or a workaround, please, help me out.

I tried

var pagerViewControllers = [UIViewController]
...
let viewControllerIndex = pagerViewControllers.indexOfObject(viewController)

[EDIT]

Just to avoid confusion and for those downvoting the question, NSArray used to have the indexOf method. That method was replaced by indexOfObject in NSArray but you can still use indexOf [and it is workign like that now] for NSMUtableArray. Actually the line shown above will throw an error, even though parent class NSArray does have indexOfObject.

This whole thing makes it very confusing if it is the first time that you're working with arrays in Swift, which it is the case. In the answers and comments to this question, you'll see this confusion reflected all over, so I think the question is valuable for clarification to others, and the right answer was selected.

[EDIT]

The documentation won't list things that are already provided by a superclass. — Cezary Wojcik
– Cezary Wojcik, Commented Jun 23, 2016 at 5:41

Nitin Gohel · Accepted Answer · 2016-06-23 05:46:59Z

5

For the getting index of an element in an NSMutableArray you have the object that you wanted to get index so try the following small code and save your remaining Hair lol

let indexof = yourarray.indexOf("a")

define array like:

var myarray = [String]()

do code like:

       myarray = ["nitin" , "nitin2"]
       // let index = myarray.indexOf("nitin")

        if let index = myarray.indexOf("nitin")
        {
          print("indexis = \(index)")
        }

edited Jun 23, 2016 at 5:46

answered Jun 23, 2016 at 5:40

Nitin Gohel

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11 Comments

Nitin Gohel Over a year ago

wait will give you sample demo

Reydel Leon Over a year ago

Yep, you'll save me the remaining hair, haha.

Code Over a year ago

indexOf is not a method of NSMutableArray.

Reydel Leon Over a year ago

It is @Code. It's indexOfObject that is not. That's what was confusing me.

Nitin Gohel Over a year ago

in swift define NSMutableArray like var myarray = [String]() instead of using NSMutablearray Keyword

|

Amit Jagesha シ · Accepted Answer · 2016-06-23 05:50:27Z

2

int i;
for (i = 0; i < [myArray count]; i++) {
  id myArrayElement = [myArray objectAtIndex:i];
...do after find your exact Element
 }

You can Iterate NSMutableArray and to find the location of particular Object use

 int indexValue = [yourArray indexOfObject:yourObject];

answered Jun 23, 2016 at 5:50

Amit Jagesha シ

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Comments

Nirav D · Accepted Answer · 2016-06-23 05:54:39Z

2

You need to try this method of NSMutableArray but if you are using i recommended to use Array instead of NSMutableArray

let index = arr.indexOfObject("A");

Hope this will help you

edited Jun 23, 2016 at 5:54

answered Jun 23, 2016 at 5:42

Nirav D

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3 Comments

Reydel Leon Over a year ago

Hey, I have to use MutableArray and it doesn't have the indexOfObject method.

Nirav D Over a year ago

The Array you are using is Swift Array not NSMutableArray. Please check what you have created.

Nirav D Over a year ago

I think you need to read the documentation on swift for NSMutableArray and Array. First read that and then go for coding.

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