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In iOS, the most commonly used collection types and methods are:

• Array — an ordered list of elements. Allows adding, removing, and modifying elements by index.

  • Methods: append(), insert(), remove(at:), sort(), filter(), map().

• Set — an unordered collection of unique elements.

  • Fast search and existence check.
  • Methods: insert(), remove(), contains(), set operations (union, intersection).

• Dictionary — a collection of key-value pairs.

  • Fast access to values via key.
  • Methods: updateValue(), removeValue(forKey:), iteration over keys and values.

Features:

• Array maintains order, allows duplicates.
• Set does not guarantee order, does not allow duplicates.
• Dictionary stores data in pairs, keys are unique.

Example of using Array:

var numbers = [1, 2, 3]
numbers.append(4) // [1, 2, 3, 4]
let filtered = numbers.filter { $0 % 2 == 0 } // [2, 4]

Example of using Set:

var fruits: Set = ["apple", "banana"]
fruits.insert("orange")
fruits.contains("banana") // true

These collections cover most data storage and processing tasks in iOS.