CODEWITHSUNDEEP
objective-cnsmutablearray
Lauren Quantrell
Lauren Quantrell

Reputation: 2669

Add Objects from one Array to Another at a Specific Position

I have two Mutable Arrays, firstArray and secondArray. Both are populated with objects. I want to add the objects from secondArray to firstArray at a specific point (not at the end and not at the beginning) in the firstArray. Is there a way to do this? Currently I'm only using this line of code:

[self.firstArray addObjectsFromArray:secondArray];

What I want is FOO CODE: self.firstArray addObjectFromArray AT SPECIFIC POINT X: secondArray,specificpointX)

Any help is appreciated!

Upvotes: 5

Views: 8756

Answers (3)

Nick Cartwright
Nick Cartwright

Reputation: 8254

Check out the documentation for NSMutableArray.

You just need to use the insertObject:AtIndex: function.

I've listed a simple example below where I create an array of size 10 and add an object at index 5.

NSMutableArray *myArray = [NSMutableArray arrayWithCapacity:10];
[myArray insertObject:@"Hello World" AtIndex:5];

Upvotes: 1

yuanjilee
yuanjilee

Reputation: 607

Swift:

let insetIndex = 3  // your any insert index
var array1 = ["1", "2", "3", "4", "5"]
let array2 = ["10", "11"]
array1.insert(contentsOf: array2, at: insetIndex)

OC:

int loc = 3;  // your any insert index
NSMutableArray *array1 = [NSMutableArray arrayWithObjects:@"1", @"2", @"3", @"4", @"5", nil];
NSMutableArray *array2 = [NSMutableArray arrayWithObjects:@"10", @"11", nil];

NSRange range = NSMakeRange(loc, array2.count);  // NOTE: NSMakeRange(NSUInteger loc, NSUInteger len)  len must be your array2.cout, or will crash with differs from count of index set

NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:range];
[array1 insertObjects:array2 atIndexes:indexSet];

output: ["1", "2", "3", "10", "11", "4", "5"]

Upvotes: 0

Lauren Quantrell
Lauren Quantrell

Reputation: 2669

Answering my own question, this works:

 int z;
 z = (int)self.specificPosition;

 // Start adding at index position z and secondArray has count items

 NSRange range = NSMakeRange(z, [secondArray count]);     
 NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:range];
 [self.firstArray insertObjects:secondArray atIndexes:indexSet];

Upvotes: 14

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