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iOS Object-Oriented Swift Complex Data Structures Instance Methods

Bader Abuqamaz
Bader Abuqamaz
2,587 Points

Functions Vs. Methods

Hello all, I tried watching these series a couple of time. Now I now how to create a struct and how to deal with functions. However, I don't see the point of why we are creating methods from the first place if we could achieve the same thing by just creating a simple function.

Have you tried playing around in Xcode playground?

1 Answer

Hi, methods are just functions inside of an object

If you look at this example, this struct object is for counting.

struct Counter {
        var count = 0

        func incrementByOne() {
            count += 1
        func increment(by amount: Int) {
            count += amount
        func reset() {
            count = 0

If we then assign the object to a constant

let viewCount = Counter()

We then can access , update and store properties form this object.

viewCount.count // This would display 0
viewCount.count // This would display 1

The greatest thing about using methods and objects is that the object can be used in many different cases. We can assign this object to a new constant and update the values of count without affecting the others instances of that object

let subscribers = Counter()
viewCount.count // This would display 1 because we haven't updated the variable *count*
subscribers.count // This would display 0
subscribers.increment( amount: 10) 
subscribers.count // This would display 10

In the example above us we can create a new instance of the object without changing the other instances. We can not get this functionality from using just functions.

Sorry for this being so long. Hope this helps I would play about in Xcode playground and do further tests.