How to swap value index in NSArray

Question

I have NSArray. I have some value inside that array.

NSArray *testArray = [NSArray arrayWithObjects:@"Test 1", @"Test 2", @"Test 3", @"Test 4", @"Test 5", nil];
NSLog(@"%@", testArray);

Result is like bellow :

(
"Test 1",
"Test 2",
"Test 3",
"Test 4",
"Test 5"
)

Now I want the result like this :

(
"Test 3",
"Test 5",
"Test 1",
"Test 2",
"Test 4"
)

Is there any way to do it without re-initialize the array? Can I swap the value of this array ?

Answer 1

Use NSMutableArray to swap two objects.

- exchangeObjectAtIndex:withObjectAtIndex:

This exchanges the objects in the array at given indexes(idx1 and idx2)

idx1
The index of the object with which to replace the object at index idx2.

idx2
The index of the object with which to replace the object at index idx1.

SWIFT

func exchangeObjectAtIndex(_ idx1: Int,
         withObjectAtIndex idx2: Int)

OBJECTIVE-C Use a NSMutableArray

  - (void)exchangeObjectAtIndex:(NSUInteger)idx1
                withObjectAtIndex:(NSUInteger)idx2

Swapping elements in an NSMutableArray