How are objects organized and placed in memory when using an array?

In iOS, objects are usually placed in the heap, and arrays are structures that can contain pointers to objects.

When talking about a regular array of objects (for example, an NSArray or Array in Swift), then:

• The array stores references (pointers) to objects, and the objects themselves are located in the heap.
• The array is a contiguous block of memory where pointers to objects are stored, not the objects themselves.

For example, in Swift:

let obj1 = NSObject()
let obj2 = NSObject()
let array = [obj1, obj2]

Here, array contains two pointers to the objects obj1 and obj2, which are located in the heap.

If you use an array of primitive types (for example, Int), then the values are stored directly in the array's memory, as they are value types.

Thus, when using an array of objects in iOS:

• The array is a sequence of pointers stored consecutively in memory.
• The objects are separate memory blocks in the heap, pointed to by the array elements.

This is important to consider when working with performance and memory management.